2015 Pacific hurricane season

Last updated

2015 Pacific hurricane season
2015 Pacific hurricane season summary map.png
Season summary map
Seasonal boundaries
First system formedMay 28, 2015
Last system dissipatedDecember 31, 2015
(record latest)
Strongest storm
Name Patricia
(Most intense hurricane in the Western Hemisphere)
  Maximum winds215 mph (345 km/h)
(1-minute sustained)
  Lowest pressure872 mbar (hPa; 25.75 inHg)
Seasonal statistics
Total depressions31 (record high)
Total storms26
Hurricanes16
(record high, tied with 1990, 1992 and 2014)
Major hurricanes
(Cat. 3+)
11 (record high)
Total fatalities40 direct, 5 indirect
Total damage$566 million (2015 USD)
Related articles
Pacific hurricane seasons
2013, 2014, 2015, 2016, 2017

The 2015 Pacific hurricane season was the second-most active Pacific hurricane season on record, with 26 named storms, only behind the 1992 season. A record-tying 16 of those storms became hurricanes, and a record 11 storms further intensified into major hurricanes throughout the season. [nb 1] The Central Pacific, the portion of the Northeast Pacific Ocean between the International Date Line and the 140th meridian west, had its most active year on record, with 16 tropical cyclones forming in or entering the basin. Moreover, the season was the third-most active season in terms of accumulated cyclone energy, amassing a total of 287 units. The season officially started on May 15 in the Eastern Pacific and on June 1 in the Central Pacific; they both ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Northeast Pacific basin. However, the formation of tropical cyclones is possible at any time of the year. This was shown when a tropical depression formed on December 31. The above-average activity during the season was attributed in part to the very strong 2014–16 El Niño event.

1992 Pacific hurricane season hurricane season in the Pacific Ocean

The 1992 Pacific hurricane season was the most active Pacific hurricane season on record, featuring 27 named storms, and the second-costliest Pacific hurricane season in history, behind only the 2013 season. The season also produced the second-highest ACE value on record in the basin, surpassed by the 2018 season. The season officially started on May 15 in the eastern Pacific, and on June 1 in the central Pacific, and lasted until November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean. However, these bounds were easily exceeded when Hurricane Ekeka formed on January 28 and again a couple months later with Tropical Storm Hali.

International Date Line imaginary line that demarcates the change of one calendar day to the next

The International Date Line (IDL) is an imaginary line of demarcation on the surface of Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next. It passes through the middle of the Pacific Ocean, roughly following the 180° line of longitude but deviating to pass around some territories and island groups.

140th meridian west

The meridian 140° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.

Contents

The season featured several long-tracking and powerful storms, although land impacts were often minimal. In June, Hurricane Blanca, an early season Category 4 hurricane, killed four people due to rough seas. Hurricane Carlos caused minor damage while passing a short distance off the coast of Mexico. In July, the remnants of Hurricane Dolores brought record rainfall to Southern California, killing one and causing losses worth over $50 million. [nb 2] On August 29, three Category 4 hurricanes (Kilo, Ignacio, Jimena) were all active simultaneously in the Pacific east of the International Date Line for the first time in recorded history. In September, moisture from Hurricane Linda contributed to storms that killed 21 people in Utah. Later that month, Hurricane Marty inflicted $30 million in damage to the southwestern coast of Mexico. In October, Hurricane Patricia became the most intense hurricane ever recorded in the Western Hemisphere, with a central pressure of 872  mbar (hPa; 25.75  inHg) and 1-minute sustained winds of 215  mph (345  km/h). After also becoming the strongest landfalling Pacific hurricane on record, Patricia claimed 13 lives and was responsible for $463 million in damage. The season's activity continued into November when Hurricane Sandra became the strongest Pacific hurricane ever recorded in that month.

Hurricane Blanca (2015)

Hurricane Blanca was the earliest recorded tropical cyclone to make landfall in Baja California in any given year. Forming as a tropical depression on May 31, Blanca initially struggled to organize due to strong wind shear. However, once this abated, the system took advantage of high sea surface temperatures and ample moisture. After becoming a tropical storm on June 1, Blanca rapidly intensified on June 2–3, becoming a powerful Category 4 hurricane on the Saffir–Simpson hurricane wind scale; maximum sustained winds reached 145 mph (230 km/h) at this time. The hurricane's slow motion resulted in tremendous upwelling of cooler water, resulting in a period of weakening. Blanca gradually recovered from this and briefly regained Category 4 status on June 6 as it moved generally northwest toward the Baja California peninsula. Cooler waters and increased shear again prompted weakening on June 7 and the system struck Baja California Sur on June 8 as a weak tropical storm. It quickly degraded to a depression and dissipated early the next day.

Southern California Place in California, United States

Southern California is a geographic and cultural region that generally comprises California's southernmost counties, and is the second most populous urban agglomeration in the United States. The region contains ten counties: Imperial, Los Angeles, Orange, Riverside, San Bernardino, San Diego, Santa Barbara, San Luis Obispo, Ventura, and Kern counties.

Hurricane Linda (2015)

Hurricane Linda was a strong tropical cyclone in September 2015 that resulted in heavy rains across portions of Mexico and the Southwestern United States. The seventeenth named storm and eleventh hurricane of the season, Linda developed southwest of Mexico from a low pressure area on September 5. Under warm sea surface temperatures and low to moderate wind shear, the system intensified into Tropical Storm Linda by September 6 and a hurricane by the next day. A well-defined eye soon formed within the storm's central dense overcast and Linda reached its peak intensity as a 125 mph (205 km/h) Category 3 major hurricane on the Saffir–Simpson hurricane wind scale on September 8. Thereafter, the storm moved into a stable environment and an area of lower sea surface temperatures, causing rapid weakening. Convective activity dissipated and Linda degenerated into a remnant low on September 10. The lingering system persisted southwest of Baja California, ultimately opening up into a trough on September 14.

Seasonal forecasts

RecordNamed
storms
HurricanesMajor
hurricanes
Ref
Average (1981–2010):15.47.63.2 [1]
Record high activity: 1992: 27 2015: 162015: 11 [2]
Record low activity: 2010: 8 2010: 3 2003: 0 [2]
DateSourceNamed
storms
HurricanesMajor
hurricanes
Ref
April 10, 2015 SMN 19114 [3]
May 27, 2015 CPC 15–227–125–8 [4]
AreaNamed
storms
HurricanesMajor
hurricanes
Ref
Actual activity:EPAC181310
Actual activity:CPAC831
Actual activity:261611

On April 10, 2015, the Servicio Meteorológico Nacional (SMN) issued its first outlook for the Pacific hurricane season, forecasting 19 named storms, 11 hurricanes, and 4 major hurricanes. The organization listed a set of seasons with similar atmospheric and oceanic conditions, including 1982, 1986, 1991, 1994, 2002, and 2014. [3] On May 27, the National Oceanic and Atmospheric Administration's Climate Prediction Center (CPC) released its forecast for the year, highlighting a 70% chance of an above-average season with 15–22 named storms, 7–12 hurricanes, 5–8 major hurricanes, and an Accumulated Cyclone Energy (ACE) index range of 110–190% of the median. While both organizations cited an intensifying El Niño as a cause of increased activity, the CPC also highlighted the difference in global sea surface temperature patterns in 2015 versus the 1995–2014 period. [3] [4] The season ended up exceeding all of these forecasts with 26 named storms, 16 hurricanes, 11 major hurricanes, and an ACE index at more than 200% of the median. [2]

1982 Pacific hurricane season hurricane season in the Pacific Ocean

The 1982 Pacific hurricane season, with 23 named storms, ranks as the fourth-most active Pacific hurricane season on record, tied with 2018. It was at that time the most active season in the basin until it was later surpassed by the 1992 season. It officially started June 1, 1982, in the eastern Pacific, and June 1, 1982, in the central Pacific, and lasted until October 31, 1982, in the central Pacific and until November 15, 1982, in the Eastern Pacific. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean. At that time, the season was considered as the most active season within the basin; however, the 1992 season surpassed these numbers a decade later.

1986 Pacific hurricane season hurricane season in the Pacific Ocean

The 1986 Pacific hurricane season saw several tropical cyclones contribute to significant flooding to the Central United States. The hurricane season officially started May 15, 1986, in the eastern Pacific, and June 1, 1986 in the central Pacific, and lasted until November 30, 1986 in both regions. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean. A total of 17 named storms and 9 hurricanes developed during the season; this is slightly above the averages of 15 named storms and 8 hurricanes, respectively. In addition, 26 tropical depressions formed in the eastern Pacific during 1986, which, at the time, was the second most ever recorded; only the 1982 Pacific hurricane season saw a higher total.

1991 Pacific hurricane season hurricane season in the Pacific Ocean

The 1991 Pacific hurricane season was a near-average Pacific hurricane season. The worst storm this year was Tropical Storm Ignacio, which killed ten people in Mexico. Elsewhere, Tropical Storm Ignacio injured forty people in Mexico, and Hurricane Fefa caused flooding in Hawaii. Hurricane Kevin was the strongest system of the season and became the then longest-lasting hurricane in the eastern north Pacific basin. Hurricane Nora was the strongest November storm at that time.

Seasonal summary

Hurricane Sandra (2015)Hurricane PatriciaHurricane Marty (2015)Hurricane Linda (2015)Typhoon HalolaHurricane Carlos (2015)Hurricane Blanca (2015)Saffir–Simpson hurricane wind scale2015 Pacific hurricane season
Map of sea surface temperature (SST) anomalies in the Pacific Ocean on October 15, showing well above-normal SSTs east of the International Date Line (180deg) Pacific SST anomaly 10-15-2015.gif
Map of sea surface temperature (SST) anomalies in the Pacific Ocean on October 15, showing well above-normal SSTs east of the International Date Line (180°)

The Accumulated Cyclone Energy (ACE) index for the season was 160.4225 units in the Eastern Pacific and 126.535 units in the Central Pacific. The total ACE for the Northeast Pacific basin in 2015 amounted to 286.9575 units. [nb 3] ACE is a rough measure of the energy generated by a tropical cyclone over its lifespan, and is calculated every six hours when the tropical cyclone has sustained wind speeds of at least 39 mph (63 km/h). Therefore, more intense and longer-lived tropical cyclones will generate more ACE. [5]

The maximum sustained wind associated with a tropical cyclone is a common indicator of the intensity of the storm. Within a mature tropical cyclone, it is found within the eyewall at a distance defined as the radius of maximum wind, or RMW. Unlike gusts, the value of these winds are determined via their sampling and averaging the sampled results over a period of time. Wind measuring has been standardized globally to reflect the winds at 10 metres (33 ft) above the Earth's surface, and the maximum sustained wind represents the highest average wind over either a one-minute (US) or ten-minute time span, anywhere within the tropical cyclone. Surface winds are highly variable due to friction between the atmosphere and the Earth's surface, as well as near hills and mountains over land.

Overall, 31 tropical cyclones formed, of which 26 reached tropical storm intensity and were named. A total of 16 of these storms became hurricanes, and a record-breaking 11 became major hurricanes. [nb 1] These values make the 2015 season the second-most active on record. [2] [6] The Central Pacific, meanwhile, had its most active year on record, with 16 tropical cyclones forming in or entering the basin, [7] easily surpassing the old record of 11 set in 1992 and 1994. [8] The season officially began on May 15 in the Eastern Pacific, and on June 1 in the Central Pacific; the season ended officially on November 30, [9] though a tropical depression formed well after that on December 31. [10] The well-above-average activity levels were largely attributed to the strong 2014–16 El Niño event, which brought anomalously high sea surface temperatures and low vertical wind shear to western parts of the basin. [8] [11] In fact, for the region between the 116th meridian west and the International Date Line, sea surface temperatures from July to October averaged 28 °C (82 °F), the highest value on record since reliable data records began in 1979. Wind shear in the region was also at its lowest on record during that period. [12] The existence of a large region of rising air over the basin during much of the season, a feature typical of El Niño events, further facilitated the development and intensification of the season's numerous tropical cyclones. [11]

Tropical cyclones and subtropical cyclones are named by various warning centers to provide ease of communication between forecasters and the general public regarding forecasts, watches, and warnings. The names are intended to reduce confusion in the event of concurrent storms in the same basin. Generally once storms produce sustained wind speeds of more than 33 knots, names are assigned in order from predetermined lists depending on which basin they originate. However, standards vary from basin to basin: some tropical depressions are named in the Western Pacific, while tropical cyclones must have a significant amount of gale-force winds occurring around the centre before they are named in the Southern Hemisphere.

1994 Pacific hurricane season hurricane season in the Pacific Ocean

The 1994 Pacific hurricane season was the final season of the eastern north Pacific's consecutive active hurricane seasons that unofficially started in 1982. The season officially started on May 15, 1994, in the eastern Pacific, and on June 1, 1994, in the central Pacific, and lasted until November 30, 1994. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean. The first tropical cyclone formed on June 18, while the last system dissipated on October 26. This season, twenty-two tropical cyclones formed in the north Pacific Ocean east of the dateline, with all but two becoming tropical storms or hurricanes. A total of 10 hurricanes occurred, including five major hurricanes.

2014–16 El Niño event

The 2014–16 El Niño was a warming of the eastern equatorial Pacific Ocean that resulted in unusually warm waters developing between the coast of South America and the International Date Line. These unusually warm waters influenced the world's weather in a number of ways, which in turn significantly affected various parts of the world. These included drought conditions in Venezuela, Australia and a number of Pacific islands while significant flooding was also recorded. During the event, more tropical cyclones than normal occurred within the Pacific Ocean, while fewer than normal occurred in the Atlantic Ocean.

Hurricanes Kilo (left), Ignacio (center), and Jimena (right), all at major hurricane intensity, spanning the Central and Eastern Pacific basins on August 30 Kilo, Ignacio and Jimena 2015-08-30 2100Z.jpg
Hurricanes Kilo (left), Ignacio (center), and Jimena (right), all at major hurricane intensity, spanning the Central and Eastern Pacific basins on August 30

The season started off with three successive hurricanes, with Andres and Blanca both reaching Category 4 status. [13] On June 3, Blanca became both earliest second hurricane and second major hurricane in the basin since reliable records began in 1971, and became the earliest instance of a landfall on the Baja California Peninsula. [14] Ten days later, Carlos became the second-earliest third hurricane on record. [15] After about a month of inactivity, eight systems formed in July, including five from July 8–12. Ela became the earliest named storm to form in the Central Pacific within the bounds of the official season, and along with Iune and Halola, marked the first month in the satellite era where three tropical cyclones were observed in the Central Pacific. [16] [17] Six more systems formed in an active August. [18] [19] Early on August 30, Hurricanes Kilo, Ignacio and Jimena intensified into Category 4 hurricanes. This was the first time in the historical record that three or more major hurricanes existed simultaneously in the Pacific east of the International Date Line, and that two or more major hurricanes existed simultaneously in the Central Pacific. [20] [21]

Landfall event of a storm moving over land after being over water

Landfall is the event of a storm or waterspout moving over land after being over water.

Baja California Peninsula peninsula of North America on the Pacific Coast of Mexico

The Baja California Peninsula is a peninsula in Northwestern Mexico. It separates the Pacific Ocean from the Gulf of California. The peninsula extends 1,247 km from Mexicali, Baja California in the north to Cabo San Lucas, Baja California Sur in the south. It ranges from 40 km at its narrowest to 320 km at its widest point and has approximately 3,000 km of coastline and approximately 65 islands. The total area of the Baja California Peninsula is 143,390 km2 (55,360 sq mi).

September saw the formation of five systems, excluding Kevin which was named in September but formed on August 31. [22] [23] Three systems—Linda, Sixteen-E, and Marty—affected Mexico, with the first two also bringing floods to the Southwestern United States. [24] [25] [26] The flood event caused by Linda in Utah was also the state's deadliest. [24] October saw another five systems. [27] [28] With the formation of Oho on October 3, the 2015 season surpassed 1992 and 1994 as the most active year on record in the Central Pacific. [29] During October 18–19, Olaf became the southernmost-forming hurricane and major hurricane in the Eastern Pacific. [30] [31] Olaf later became the first system on record to cross from the Eastern Pacific into the Central Pacific and then back into the Eastern Pacific while still a tropical cyclone. [32] Patricia became the strongest hurricane in the basin on October 23 when its pressure fell to 892  mbar (hPa; 26.34  inHg), breaking the previous record of 902 mbar (hPa; 26.64 inHg) set by 1997's Hurricane Linda. [33] Patricia subsequently became the strongest tropical cyclone on record in the Western Hemisphere in terms of barometric pressure, with a central pressure of 872 mbar (hPa; 25.75 inHg). This value was also the second-lowest globally, behind Typhoon Tip of 1979 which had a central pressure of 870 mbar (hPa; 25.69 inHg). Additionally, its maximum sustained winds of 215 mph (345 km/h) were the strongest ever reliably recorded or estimated anywhere globally. [34] Patricia later became the strongest Pacific hurricane to strike Mexico after making landfall in Jalisco as a strong Category 4 hurricane. [34]

The following month tied for the most active November with the development of two systems, Rick and Sandra. [2] [35] Sandra subsequently strengthened into a major hurricane, bringing the season total to a record 11. [2] Its peak winds of 150 mph (240 km/h) and minimum central pressure of 934 mbar (hPa; 27.58 inHg) surpassed Hurricane Kenneth of 2011 for the strongest November Pacific hurricane in terms of both sustained winds and central pressure. [36] Despite the official end of the season on November 30, [9] anomalously favorable conditions in the Central Pacific gave rise to the final storm of the season, Tropical Depression Nine-C, which formed on December 31 and dissipated late the same day. [10] This marked the latest end to a Pacific hurricane season on record. [2]

Systems

Hurricane Andres

Category 4 hurricane (SSHWS)
Andres 2015-05-31 1825Z.jpg   Andres 2015 track.png
DurationMay 28 – June 4
Peak intensity145 mph (230 km/h) (1-min)  937  mbar  (hPa)

On May 23, the National Hurricane Center (NHC) began monitoring the potential for tropical cyclogenesis well south of Mexico over the following days. [37] A broad low-pressure area formed three days later, steadily organizing to become Tropical Depression One-E at 06:00  UTC on May 28. [38] With an increase in spiral banding and an expanding central dense overcast, the depression was upgraded to Tropical Storm Andres six hours later. [39] Directed west-northwest and eventually northwest by a subtropical ridge over Mexico, the cyclone quickly organized and became a hurricane on May 29. A spurt of intensification saw Andres strengthen into a strong Category 2 hurricane late the next day. Andres's intensification trend leveled off thereafter due to an eyewall replacement cycle and a brief increase in vertical wind shear, but Andres still managed to reach major hurricane status early on May 31, becoming one of only five major hurricanes during the month of May. [38] Although forecasts did not indicate additional strengthening, [40] Andres began a period of rapid deepening the following day as wind shear decreased, intensifying into a Category 4 hurricane at 00:00 UTC on June 1. Andres reached its peak intensity six hours later with maximum sustained winds of 145 mph (230 km/h) and a minimum pressure of 937  mbar (hPa; 27.67  inHg). [38] Thereafter, the system moved west-northwestwards over cooler waters and into a more stable environment, which led to a swift weakening trend. Andres fell below hurricane strength on the morning of June 2, and weakened into a tropical storm a day later. Further weakening ensued as convection around Andres's center dissipated, [38] and the NHC declared Andres a remnant low on June 4. [41]

Moisture extending from the remnants of Andres brought light rain to parts of the Southwest United States, with Phoenix, Arizona having measurable precipitation on June 5 for the first time since records began in 1896. [42] This moisture further extended into Colorado, resulting in scattered severe thunderstorms. [43]

Hurricane Blanca

Category 4 hurricane (SSHWS)
Blanca 2015-06-03 2025Z (cropped).jpg   Blanca 2015 track.png
DurationMay 31 – June 9
Peak intensity145 mph (230 km/h) (1-min)  936  mbar  (hPa)

A tropical wave first monitored by the NHC late on May 27 spawned a weak low-pressure area well south of Acapulco, Mexico, two days later. [44] [45] Plagued by strong upper-level winds from Hurricane Andres, the disturbance slowly organized into the season's second tropical depression at 12:00 UTC on May 31 and further into Tropical Storm Blanca on the following day. Moving little within a weak steering regime, the cyclone began to rapidly deepen by June 2 as conditions aloft became more favorable; following the appearance of a pinhole eye, Blanca became a major hurricane at 12:00 UTC on June 3. Shortly thereafter, Blanca reached its peak intensity as a Category 4 hurricane with winds of 145 mph (230 km/h) and a pressure of 936 mbar (hPa; 27.64 inHg). [14] Tremendous upwelling of cooler waters, with some areas falling from 30 to 21 °C (86 to 70 °F), [46] resulted in weakening early on June 4. A concurrent eyewall replacement cycle spurred further weakening and Blanca degraded to Category 1 status by June 5. The next day, a shifting ridge steered Blanca northwest back over warm waters, allowing Blanca to quickly reintensify to a secondary peak of 130 mph (215 km/h). However, as Blanca tracked poleward, waters beneath the cyclone cooled yet again, prompting a quick weakening trend. After weakening to a tropical storm on June 7, Blanca made landfall around 12:00 UTC on June 8, near Puerto Cortés with winds of 45 mph (75 km/h), [14] and became the earliest instance of a landfall in the Baja California Peninsula since records began in 1949. [46] Swiftly weakening over land, Blanca degenerated to a remnant low on June 9 and dissipated shortly after. [14]

On June 3, precautionary alerts were raised across the southern Baja California Peninsula and much of Western Mexico, due to potential impacts from the hurricane. [47] A collective 3,300 troops from the Mexican Army and Navy were deployed to Baja California Sur to ensure the safety of residents. [48] Although Blanca remained far from Jalisco, large swells and rip currents produced by the hurricane claimed four lives. [49] Across Baja California Sur, high winds downed power lines and left 104,106 residents without electricity. However, around 90 percent of the outages were fixed within 12 hours of the storm. [50] The remnants of Blanca later brought much-needed rain to parts of the Southwestern United States. [51] Daily rainfall records were broken in several areas, though accumulations were generally less than 1 in (25 mm). [52] Some flooding took place in Santa Barbara County, California. [53] Flash floods across Nevada inundated homes and roads, [54] [55] and also caused minor damage to landscaping. [56] In New Mexico, strong thunderstorms brought hail of up to 1.75 in (4.4 cm) in diameter, [57] and spawned a brief EF0 tornado near Napi Headquarters. [58] Damage across California amounted to $68,000, [59] while damage across Nevada totaled $46,000. [60] Damage in New Mexico reached $20,000. [61] Additionally, on June 10, some of Blanca's moisture moved north and brought light showers to the San Francisco Bay Area. [62]

Hurricane Carlos

Category 1 hurricane (SSHWS)
Carlos 2015-06-13 1755Z.jpg   Carlos 2015 track.png
DurationJune 10 – June 17
Peak intensity90 mph (150 km/h) (1-min)  978  mbar  (hPa)

In early June, a Kelvin wave interacted with a few tropical waves to the south of Mexico. The system gradually organized and was designated as a tropical depression on June 10, while situated about 290 mi (470 km) south-southeast of Puerto Escondido, Oaxaca. Drifting slowly northwestward, the depression was upgraded further to tropical storm intensity. Although persistent wind shear and dry air hampered intensification early on, Carlos strengthened into a hurricane on June 13 after moving into more favorable conditions. However, the return of dry air and upwelling caused the storm to deteriorate into a tropical storm. Paralleling the Mexican coast, Carlos regained hurricane intensity on June 15 and peaked with sustained winds of 90 mph (150 km/h) and a pressure of 978 mbar (hPa; 28.88 inHg) the next day. Wind shear and dry air afterwards caused Carlos to rapidly weaken, falling to tropical storm intensity on June 17 and degenerating into a remnant low-pressure area hours later. [63]

Carlos' formation prompted coastal authorities to enact precautionary measures along states deemed at risk. In Guerrero, 507 shelters were opened. [64] The NHC also issued several tropical cyclone warnings and watches between June 11 and June 17 from Jalisco to Guerrero. Rough seas along the shore generated by the hurricane caused widespread damage. [63] Twelve ships, including a yacht worth 11 million pesos (US$717,000), [65] sunk in Playa Manzanillo harbor. [66] The waves, along with heavy rain, inflicted at least 5 million pesos (US$326,000) of damage on Michoacán's coastal installations. [63] Strong winds produced by the passing storm also downed trees, power poles, and billboards, especially in Acapulco. [67] There, 16 homes were swept away by the waves. [68]

Tropical Storm Ela

Tropical storm (SSHWS)
Ela 2015-07-09 2315Z.jpg   Ela 2015 track.png
DurationJuly 8 – July 10
Peak intensity45 mph (75 km/h) (1-min)  1002  mbar  (hPa)

A tropical wave crossing the Eastern Pacific spawned a low-pressure area on July 3. [69] The system gradually organized amid persistent wind shear and on July 8, the system intensified into Tropical Depression Four-E just before it entered the area of responsibility of the Central Pacific Hurricane Center (CPHC). [70] On July 9, the depression intensified into a tropical storm as it tracked to the northwest, and was named Ela by the CPHC. [71] [69] Ela intensified slightly to reach its peak intensity with winds of 45 mph (75 km/h) and a pressure of 1002 mbar (hPa; 29.59 inHg), however, strong wind shear prevented Ela from intensifying further by removing thunderstorms from the circulation center, and eventually causing it to gradually weaken. [69] Ela was downgraded to a depression on July 10, and not long after declared a remnant low well east of the Hawaiian Islands. [69]

Ela is one of just six tropical cyclones to form as a depression in the Eastern Pacific basin but not be named until entering the Central Pacific; the others are Lala, Li, Iniki and Lana. It would be succeeded by Hurricane Ulika a year later. It is also the fourth earliest storm to form during the calendar year in the Central Pacific after Ekeka and Hali of 1992, [72] as well as Pali of 2016. [73]

Tropical Storm Halola

Tropical storm (SSHWS)
Halola Jul 13 2015 0125Z.jpg   Halola 2015 track.png
DurationJuly 10 – July 12 (exited basin)
Peak intensity60 mph (95 km/h) (1-min)  998  mbar  (hPa)

A monsoon trough building across the Pacific Ocean spawned a large, ill-defined circulation well southwest of Hawaii on July 3. The circulation organized slightly and began to detach from the monsoon trough on July 6, but further development was halted for a while as an upper-level anticyclone imparted strong wind shear over the system. The anticyclone moved away on July 9, allowing the low-level circulation to move under the persistent convection to the northwest. As thunderstorm activity expanded in coverage, the system was declared Tropical Depression One-C by the CPHC at 06:00 UTC on July 10. Moving westwards under the influence a strong ridge to the north, the depression slowly strengthened into Tropical Storm Halola early on July 11. After intensifying to reach winds of 60 mph (95 km/h), a slight increase in wind shear prevented further strengthening. Maintaining that intensity, Halola crossed the International Date Line into the Western Pacific basin late on July 12, and entered the area of responsibility of the Japan Meteorological Agency. [74]

Tropical Storm Iune

Tropical storm (SSHWS)
Iune Jul 11 2015 2140Z.jpg   Iune 2015 track.png
DurationJuly 10 – July 13
Peak intensity40 mph (65 km/h) (1-min)  1004  mbar  (hPa)

A weak low-pressure area was first identified in the monsoon trough southeast of Hawaii on July 2. It drifted west-northwest, gradually becoming better defined as thunderstorm activity increased and it separated from the monsoon trough; by 06:00 UTC on July 10, there was sufficient organization to declare it a tropical depression. The small size of the cyclone made it especially susceptible to moderate upper-level winds, and it failed to intensify to Tropical Storm Iune until 18:00 UTC on July 11, when deep convection persisted near the center. No further intensification occurred amid light southerly wind shear, and Iune weakened to a tropical depression around 18:00 UTC on July 12 as it moved west-southwest. After being devoid of thunderstorm activity for 18 hours, the storm degenerated to a remnant low by 12:00 UTC the next day. The post-tropical cyclone moved west across the Central Pacific before finally dissipating around 12:00 UTC on July 17. [75]

Hurricane Dolores

Category 4 hurricane (SSHWS)
Dolores 2015-07-15 1755Z.jpg   Dolores 2015 track.png
DurationJuly 11 – July 18
Peak intensity130 mph (215 km/h) (1-min)  946  mbar  (hPa)

A westward-moving tropical wave crossed Central America and entered the Eastern Pacific on July 9. On July 11, the system was declared Tropical Depression Five-E while located roughly 345 mi (555 km) south-southeast of Acapulco, Mexico. Amid moderate northwesterly wind shear, the depression gradually strengthened into Tropical Storm Dolores and reached hurricane status on July 13. As Dolores moved roughly parallel to the coast of Mexico, the shear over the system decreased, allowing for a burst of rapid intensification. Dolores peaked as a Category 4 hurricane with winds of 130 mph (215 km/h) and a minimum pressure of 946 mbar (hPa; 27.94 inHg) early on July 15. However, as Dolores approached Socorro Island, the cyclone underwent an eyewall replacement cycle and began to steadily weaken. The storm remained potent though as it passed Socorro Island, with an automated weather station on the island recording sustained hurricane-force winds. Despite completing the cycle on July 16, Dolores had moved over cooler sea surface temperatures, and hence continued its weakening trend. By the morning of July 17, Dolores had deteriorated to a tropical storm, and eventually degenerated into a post-tropical remnant low about 300 mi (480 km) west of the Baja California coast the next day. The remnant low slowly curved southwards and dissipated on July 22 well west of San Diego, California. [76] [77]

Moisture extending from the storm's remnants brought record rains and thunderstorms to Southern California; record monthly rainfall totals include 1.70 in (43 mm) in San Diego, 1.30 in (33 mm) in Los Angeles, and 1.16 in (29.5 mm) in Paso Robles. In the foothills and mountains of east San Diego County, rainfall exceeded 4 in (100 mm). [78] [79] This had the effect of helping firefighters contain the North Fire, [80] but also resulted in debris flows and rock slides that damaged about 90 homes and submerged cars. [77] The San Diego River reached levels of 8.9 ft (2.7 m)—just below flood stage—and overflowed its banks in a few areas. [77] A bridge along Interstate 10 near Desert Center was washed out, injuring one. Damage to the bridge was placed at $50 million. [81] [82] A lightning strike killed a 62-year-old man in Kern County. [83] Hail the size of golf balls was recorded in Bear Valley, Alpine County, damaging a police vehicle. [84] Losses in the state reached $50.477 million. [85]

Tropical Storm Enrique

Tropical storm (SSHWS)
Enrique 2015-07-14 2155Z (cropped).jpg   Enrique 2015 track.png
DurationJuly 12 – July 18
Peak intensity50 mph (85 km/h) (1-min)  1000  mbar  (hPa)

A tropical wave about 1,150 mi (1,850 km) southwest of the tip of the Baja California Peninsula spawned a broad low-pressure area on July 10. The low's circulation became increasingly well-defined as the tropical wave moved away from the system, leading to the classification of Tropical Depression Six-E at 12:00 UTC on July 12. Gradually organizing as it crawled west-northwestwards, the depression intensified to become Tropical Storm Enrique 18 hours later. Despite being situated in a generally favorable environment, dry air to the northwest of Enrique entrained into its circulation, causing the system to struggle to intensify. Eventually, the system reached its peak intensity late on July 14 with 50 mph (85 km/h) winds and a minimum pressure of 1,000 mbar (hPa; 29.53 inHg). Thereafter, increasing southwesterly vertical wind shear threatened to expose the low-level circulation, and Enrique started to weaken on July 15. Despite moving over cooler waters, Enrique maintained its intensity over the next two days as it began to slow down and turn to the southwest under the influence of Hurricane Dolores to its east. During the afternoon of July 17, Enrique weakened to a tropical depression, and degenerated to a remnant low the next day. The remnants curved back to the east over the next few days, dissipating entirely well west of the Baja California Peninsula by July 22. [86]

Tropical Storm Felicia

Tropical storm (SSHWS)
Felicia 2015-07-23 1845Z.jpg   Felicia 2015 track.png
DurationJuly 23 – July 25
Peak intensity40 mph (65 km/h) (1-min)  1004  mbar  (hPa)

A westward-tracking tropical wave moved off Africa on July 7, crossing into the East Pacific nine days later. The disturbance was initially disorganized, with a broad, elongated circulation and intermittent convection; by 06:00 UTC on July 23, however, it acquired sufficient organization to be declared a tropical depression about 430 mi (695 km) southwest of Baja California. Six hours later, the depression intensified into Tropical Storm Felicia and attained peak intensity with winds of 40 mph (65 km/h) and a pressure of 1004 mbar (hPa; 29.65 inHg). The negative effects of shear, dry air, and cooler waters began to affect Felicia almost immediately, and the cyclone weakened to a tropical depression by 00:00 UTC on July 24. All associated convection with the storm dissipated by 18:00 UTC that day, marking Felicia's degeneration into a remnant low 545 mi (880 km) west of the southern tip of Baja California. The low turned west and southwest prior to opening into a trough on July 28. [87]

Tropical Depression Eight-E

Tropical depression (SSHWS)
08E 2015-07-28 1900Z.jpg   08-E 2015 track.png
DurationJuly 27 – July 29
Peak intensity35 mph (55 km/h) (1-min)  1006  mbar  (hPa)

A tropical wave accompanied by showers and thunderstorms entered the Eastern Pacific Ocean on July 19. Tracking steadily westwards, the wave formed a low-pressure area in the middle of the Eastern Pacific on July 27. Turning slightly to the west-northwest, the low slowly intensified into Tropical Depression Eight-E six hours later. However, strong north-northwesterly wind shear prevented it from intensifying into a tropical storm. As Eight-E moved into a drier environment, it failed to sustain deep convection near its center, and eventually degenerated into a remnant low late on July 29. Eight-E's remnants continued tracking in a westward direction and opened up into a trough by August 1 well east-southeast of Hawaii. [88]

Hurricane Guillermo

Category 2 hurricane (SSHWS)
Guillermo 2015-07-31 1935Z.jpg   Guillermo 2015 track.png
DurationJuly 29 – August 7
Peak intensity110 mph (175 km/h) (1-min)  967  mbar  (hPa)

A tropical disturbance well south of the Baja California Peninsula gained enough organization to be declared Tropical Depression Nine-E on July 29. Located in an environment of low wind shear, high sea surface temperatures and abundant moisture, conditions were very favorable for strengthening, allowing Nine-E to intensify into Tropical Storm Guillermo just six hours later. Continuing to quickly intensify while tracking steadily west-northwestwards, Guillermo became a hurricane only 36 hours after its formation, and eventually reached peak intensity with winds of 110 mph (175 km/h) and a pressure of 967 mbar (hPa; 28.56 inHg)—a strong Category 2 hurricane. Guillermo weakened slightly afterwards, but remained at Category 2 strength as it crossed 140°W into the Central Pacific late on August 1. However, as Guillermo neared Hawaii, increasing southwesterly wind shear began to weaken the cyclone, and Guillermo eventually degraded to a tropical storm on August 3. Wobbling towards the west-northwest following a break in the subtropical ridge, Guillermo weakened further to a tropical depression on August 7, located 90 mi (150 km) north of Maui. Not long after, Guillermo degenerated to a post-tropical low, and dissipated altogether by August 9. [89]

On August 6, some of Guillermo's moisture was brought to Northern California and the San Francisco Bay Area by the jet stream, bringing rare dry lightning storms to those areas during the night. [90]

Hurricane Hilda

Category 4 hurricane (SSHWS)
Hilda 2015-08-08 2025Z.jpg   Hilda 2015 track.png
DurationAugust 5 – August 13
Peak intensity145 mph (230 km/h) (1-min)  937  mbar  (hPa)

A tropical wave behind Guillermo spawned a well-defined low-pressure area well to the west of Mexico, which became Tropical Depression Ten-E on August 5. The depression intensified into Tropical Storm Hilda the next day. Amid moderate northeasterly wind shear and warm waters, Hilda gradually strengthened into a hurricane on August 7 while moving steadily westwards. Rapid intensification ensued thereafter as the shear diminished and a small inner core developed, and Hilda became a major hurricane just before entering the Central Pacific. Continuing to rapidly intensify, Hilda eventually reached its peak intensity as a Category 4 hurricane late on August 8, possessing 145 mph (230 km/h) sustained winds and a minimum pressure of 937 mbar (hPa; 27.67 inHg). Hilda then moved over slightly cooler waters and into a drier environment, resulting in a weakening trend that saw Hilda drop below major hurricane status late on August 9. The next two days saw Hilda turn to the northwest and slow down while rounding the southwestern part of a subtropical ridge. Weakening continued and accelerated on August 10–11 as the subtropical jet stream over Hawaii inflicted strong wind shear over Hilda, exposing the low-level circulation. Under the influence of both the strong westerly jet stream and the easterly trade winds, Hilda became almost stationary as it rapidly dropped below hurricane strength on August 12. Convection over Hilda mostly dissipated by August 13, and the shallower system began to track to the west-southwest. Hilda degenerated to a remnant low south of Hawaii by August 14, [91] after bringing heavy rain to the Big Island. [92]

Tropical Depression Eleven-E

Tropical depression (SSHWS)
11E 2015-08-16 2130Z.jpg   11-E 2015 track.png
DurationAugust 16 – August 17
Peak intensity35 mph (55 km/h) (1-min)  1003  mbar  (hPa)

A broad low-pressure area around 485 mi (780 km) south-southwest of Cabo San Lucas organized into Tropical Depression Eleven-E on August 16. Moving on a northwesterly to west-northwesterly path, the cyclone failed to intensify due to its large circulation and entered an area of unfavorable conditions late on August 17. Southeasterly shear, dry air entrainment, and cooler waters caused the depression to lose its deep convection and eventually degenerate into a remnant low by August 18. The low turned to the north-northwest and dissipated two days later around 980 mi (1,575 km) west of Punta Eugenia. [93]

Hurricane Loke

Category 1 hurricane (SSHWS)
Loke 2015-08-24 2200Z.jpg   Loke 2015 track.png
DurationAugust 21 – August 26
Peak intensity75 mph (120 km/h) (1-min)  985  mbar  (hPa)

A low-level trough developed along the Intertropical Convergence Zone southeast of Hawaii on August 13. It merged with the remnants of Hurricane Hilda into the monsoon trough by August 18, and continued west with intermittent bursts of convection. One such burst detached a well-defined circulation from the monsoon trough and pulled it northeastwards, leading to the formation of a tropical depression by 00:00 UTC on August 21, which became Tropical Storm Loke later that day. A nearby upper-level trough restricted the outflow of the storm shortly after formation, causing it to briefly weaken to a tropical depression early on August 22 while it moved in an undulating fashion. However, as Loke accelerated to the northeast with the trough positioned to the northwest, the upper-level environment became more favorable, and the system regained tropical storm strength early on August 23. Developing a cloud-filled eye, Loke reached hurricane intensity around 18:00 UTC on August 24, simultaneously peaking with winds of 75 mph (120 km/h) and a pressure of 985 mbar (hPa; 29.09 inHg). Afterwards, Loke was once again hindered by the aforementioned nearby trough, which served to impart strong wind shear over the system and pull it to the north. The cyclone weakened to a tropical storm late on August 25 as it underwent extratropical transition, before it was rapidly drawn northwestwards into the circulation of a large extratropical low (formerly Typhoon Atsani) by 00:00 UTC on August 27. [94]

Hurricane Kilo

Category 4 hurricane (SSHWS)
Kilo 2015-08-29 2220Z.jpg   Kilo 2015 track.png
DurationAugust 22 – September 1 (Exited basin)
Peak intensity140 mph (220 km/h) (1-min)  940  mbar  (hPa)

The disturbance that would become Kilo was first noticed by the CPHC within a trough on August 17, located 1,150 mi (1,850 km) southeast of the Big Island of Hawaii. The disturbance produced intermittent thunderstorm activity as it exited the trough on August 19–20. A mid-level ridge steered the disturbance west-northwestwards while imparting easterly wind shear over the system, serving to prevent the disturbance from organizing. Eventually, the shear decreased as the ridge weakened, and the disturbance became a tropical depression with convection near the center of circulation on August 22. During the next two days, the depression turned to the northwest and then the north around the western end of the weakening ridge, all the while remaining rather weak and disorganized. On August 26, however, the development of a new ridge directed the depression towards the southwest and caused the remaining wind shear to decrease. This led to the depression intensifying into Tropical Storm Kilo at 18:00 UTC as the system approached Johnston Atoll. Tropical storm warnings were issued for the atoll as Kilo passed within 35 mi (55 km) to the north at around 00:00 UTC on August 28. [20]

Amid high sea surface temperatures and low vertical wind shear, Kilo began to quickly strengthen while being steered westwards by a mid-level ridge, attaining hurricane status on August 29. Over the next 24 hours, Kilo rapidly deepened into a Category 4 hurricane, with the winds nearly doubling from 75 mph (120 km/h) to 140 mph (220 km/h). Kilo reached its peak intensity at the end of this strengthening phase, with the central pressure dropping to 940 mbar (hPa; 27.76 inHg). Around this time, Kilo was one of three hurricanes at Category 4 intensity spanning the Eastern and Central Pacific basins, the first such occurrence in recorded history. Thereafter, a slight weakening trend took place, with Kilo dropping to Category 3 status late on August 30. Turning to the northwest through a break in the ridge, Kilo maintained its intensity over the next couple of days as it approached the International Date Line. Between 12:00 UTC and 18:00 UTC on September 1, Kilo crossed the Date Line and entered the jurisdiction of the Japan Meteorological Agency, simultaneously becoming a typhoon. Kilo continued on as a tropical cyclone until September 10 when it dissipated near the western Kuril Islands of Alaska, having traversed over 4,000 mi (6,400 km) from its genesis point south of the Hawaii islands. [20]

Hurricane Ignacio

Category 4 hurricane (SSHWS)
Ignacio 2015-08-29 2040Z.jpg   Ignacio 2015 track.png
DurationAugust 25 – September 4
Peak intensity145 mph (230 km/h) (1-min)  942  mbar  (hPa)

On August 25, a low-pressure system organized into Tropical Depression Twelve-E, before strengthening into Tropical Storm Ignacio later that day. Ignacio initially moved west-northwest, posing a threat to Hawaii. On August 26, Ignacio became a hurricane while continuing its trek towards Hawaii. Over the next few days, Ignacio struggled to intensify while being impacted by moderate wind shear. As wind shear relaxed, Ignacio was able to quickly intensify to major hurricane status on August 29. [95] At this time, the Big Island of Hawaii was placed under a tropical storm watch, as the island began feeling the effects of high surf. [96] Ignacio continued to rapidly intensify as it turned to the northwest and away from Hawaii, attaining peak intensity at Category 4 status with winds of 145 mph (230 km/h) and a minimum central pressure of 942 mbar (hPa; 27.82 inHg) on August 30. [95] Ignacio was also one of three simultaneous Category 4 Pacific hurricanes east of the International Date Line along with Kilo and Jimena, the first such occurrence in recorded history. [20] [21]

After peaking in intensity, Ignacio began weakening as southwesterly wind shear increased. The system weakened to tropical storm strength at midnight on September 2 well north of Hawaii, but was soon able to reattain hurricane status while passing over anomalously warm waters and experiencing a brief respite in wind shear. Continuing to track northwards over decreasing sea surface temperatures, Ignacio weakened to a tropical storm for the last time on September 3, and became post-tropical late the next day. The remnants of Ignacio continued north across the Pacific, before turning to the east-northeast towards western Canada on September 6. On September 8, the extratropical remnants of Ignacio were absorbed by a cold front, hundreds of miles south of Alaska. [95]

Hurricane Jimena

Category 4 hurricane (SSHWS)
Jimena 2015-08-29 2225Z.jpg   Jimena 2015 track.png
DurationAugust 26 – September 9
Peak intensity155 mph (250 km/h) (1-min)  932  mbar  (hPa)

A westward-moving low-pressure area organized into a tropical depression on August 26, around 735 mi (1,185 km) southwest of Manzanillo, Mexico. Moving over very warm waters and located in an environment of low wind shear and abundant moisture, the depression steadily strengthened, becoming Tropical Storm Jimena on August 27. Jimena soon developed a tight inner core, with the radius of maximum winds extending just 40 mi (65 km) from the center. This allowed Jimena to explosively deepen over the next two days—over a 48-hour period, its winds increased by 115 mph (185 km/h). At 06:00 UTC on August 29, Jimena reached its peak intensity as a strong Category 4 hurricane, possessing winds of 155 mph (250 km/h) and a minimum barometric pressure of 932 mbar (hPa; 27.52 inHg). [97] Soon after, Jimena turned to the west-northwest and underwent an eyewall replacement cycle. [97] Despite weakening slightly, Jimena remained at Category 4 status, thus becoming one of three simultaneous Category 4 Pacific hurricanes east of the International Date Line on August 30—the first such occurrence of its kind. [20]

On August 30, Jimena completed the eyewall replacement cycle and quickly regained 150 mph (240 km/h) winds, this time with a larger eye of 40–45 mi (65–75 km) diameter. However, upwelling of cooler waters beneath the hurricane and entrainment of mid-level dry air into the circulation, as well as a second eyewall replacement cycle, resulted in a steady weakening beginning late on August 31. The next day, Jimena crossed 140°W as a Category 3 hurricane and entered the jurisdiction of the CPHC. Jimena continued to weaken slowly amid cooling sea surface temperatures and increasing westerly wind shear, eventually degrading below hurricane status on September 5. [97] Curving to the northwest, bursts of convection maintained Jimena as a tropical storm, in spite of westerly wind shear in excess of 25 mph (35 km/h) causing the low-level circulation center to be exposed. [98] [99] Eventually, on September 9, Jimena weakened to a tropical depression as it turned west-southwestwards towards the Hawaiian islands. Succumbing to the strong shear, Jimena degenerated into a remnant low just before 00:00 UTC on September 10, roughly 230 mi (370 km) north of the Hawaiian islands. [97]

While passing north of the Hawaiian Islands on September 11, the remnants of Jimena diverted the winds to blow from the southeast, bringing humid air and atmospheric instability to the east-facing slopes of the Koʻolau Range on Oahu. This generated prolonged heavy rains that led to localized flash floods, made worse by saturated soils from earlier rainfall events. Flood advisories were issued early on September 11 and were cancelled the next morning. Flooding from the Waikane Stream forced the Kamehameha Highway to close for a few hours, reopening only in the evening. A peak rainfall total on Oahu of 9.37 in (238 mm) was recorded at Moanalua. [100] [101]

Tropical Storm Kevin

Tropical storm (SSHWS)
Kevin 2015-09-03 2050Z.jpg   Kevin 2015 track.png
DurationAugust 31 – September 5
Peak intensity60 mph (95 km/h) (1-min)  998  mbar  (hPa)

A tropical wave crossed Central America on August 25. Although it initially only produced transient bursts of convection, slow organization of the feature led to the formation of a tropical depression by 18:00 UTC on August 31 while located well south of Baja California. Steered northwest and the north-northwest, the cyclone intensified into Tropical Storm Kevin by 18:00 UTC the next day while being plagued by moderate wind shear. After reaching peak intensity with winds of 60 mph (95 km/h) and a pressure of 998 mbar (hPa; 29.47 inHg) on September 3, a further increase in upper-level winds caused the low- and mid-level circulations to become displaced. Devoid of deep convection, Kevin degenerated to a remnant low by 12:00 UTC on September 5; the remnant circulation drifted northwest and dissipated the following day. [102]

Hurricane Linda

Category 3 hurricane (SSHWS)
Linda 2015-09-08 2110Z.jpg   Linda 2015 track.png
DurationSeptember 5 – September 10
Peak intensity125 mph (205 km/h) (1-min)  950  mbar  (hPa)

Early in September, a cluster of clouds began to organize, becoming Tropical Depression Fifteen-E at 18:00 UTC on September 5. The next day, the depression organized enough to be classified as a tropical storm and was given the name Linda. The nascent system rapidly strengthened as it moved on a northwestward course, with large amounts of deep convection forming around the center. Just 12 hours after becoming a tropical storm, Linda reached hurricane status, and on September 7, the system became a Category 2 hurricane. Linda's strengthening stalled thereafter as wind shear increased slightly and dry air intruded on Linda's inner core. The next day, however, Linda again quickly intensified, this time to a strong Category 3 hurricane with winds of 125 mph (205 km/h) and a minimum pressure of 950 mbar (hPa; 28.05 inHg). From September 9 onward, Linda rapidly weakened as it moved into an area of dry, stable air and decreasing water temperatures, becoming a remnant low less than a week after forming. Linda's remnants slowed as they turned to the west-northwest and then back to the east before dissipating on September 14. [24]

Copious amounts of water vapor pulled north from Linda brought thunderstorms to portions of California beginning September 10. Flooding and rock slides prompted numerous road closures. One person drowned in the San Bernardino National Forest. Remnant moisture from Linda with a weak cold front also caused record heavy rainfall in Los Angeles on September 15, [103] [104] with three swift water rescues and roughly 2 in (50 mm) of rain across the Los Angeles Basin. [105] Losses in the state reached $2.1 million. [106] Moisture from Linda also catalyzed the formation of scattered thunderstorms across Utah on September 14, [107] giving rise to two major flash flood incidents that became the deadliest flood event in Utah's history, with 21 people killed. [24] The first flash flood, occurring near Hildale, swept away two vehicles carrying a total of 16 people while they were watching the rising floodwaters, killing 13 of them. [108] Another death occurred when a man was swept away by floodwaters while traversing remote dirt roads. [109] The second flash flood occurred in Keyhole Canyon at Zion National Park, causing seven canyoneers within the area to perish. [110] Damage totals in Washington County, Utah reached $750,000, [111] while downstream flooding caused a further $500,000 of damage in Colorado City, Arizona. [112] The thunderstorms also caused some scattered damage across Arizona, with losses reaching $206,000. [113]

According to San Jose State University, Linda's remnants might have contributed to the severity of the Valley Fire. [114]

Tropical Storm Malia

Tropical storm (SSHWS)
Malia 2015-09-20 0005Z.jpg   Malia 2015 track.png
DurationSeptember 18 – September 22
Peak intensity50 mph (85 km/h) (1-min)  992  mbar  (hPa)

A trough formed near the eastern reaches of the Central Pacific on September 9. It moved swiftly westward and slowly organized into a tropical depression around 18:00 UTC on September 18 as deep convection formed near its center. The nascent cyclone moved northeast after formation, steered between a ridge to its northeast and a trough to its northwest. Strong upper-level winds plagued the system throughout its duration, but the depression nonetheless intensified into Tropical Storm Malia around 00:00 UTC on September 21 and attained peak intensity with winds of 50 mph (85 km/h) and a pressure of 992 mbar (hPa; 29.29 inHg) twelve hours later. Malia turned northwest under increasing influence from the upper-trough, which simultaneously increased wind shear over the cyclone. After lacking deep convection for several hours, the storm degenerated to a remnant low by 18:00 UTC on September 22. The post-tropical cyclone moved north before being absorbed by an extratropical low over the north-central Pacific the next day. [115]

Tropical Depression Sixteen-E

Tropical depression (SSHWS)
16E 2015-09-20 1820Z.jpg   16-E 2015 track.png
DurationSeptember 20 – September 21
Peak intensity35 mph (55 km/h) (1-min)  1001  mbar  (hPa)

A tropical wave gained enough organization to be declared Tropical Depression Sixteen-E on September 20. Located in an environment of strong southerly shear, the depression failed to intensify into a tropical storm. The next day, the heavily sheared system made landfall on Baja California, then on Isla Tiburon, and finally in Sonora, Mexico. It dissipated just hours later, with its remnants going on to affect parts of Arizona and New Mexico. [25]

Widespread heavy rains in Baja California and Sonora caused heavy flooding. Preliminary damage estimates in El Fuerte, Sinaloa, reached 300 million pesos (US$17.7 million). [25] [116] The remnant low brought considerable moisture to the Desert Southwest, and later combined with other systems to produce flooding across the Great Plains and Upper Midwest. [25] [117] In Arizona, severe thunderstorms occurred in Graham and Pima counties, resulting in $7,000 in property damage. Rainfall near Safford totaled up to 4 in (100 mm), while hail and winds gusting to 60 mph (97 km/h) were recorded at Davis–Monthan Air Force Base. In addition, a EF0 tornado briefly touched down in adjacent Cochise County. [118] Flash floods near Quartzsite forced the closure of Arizona State Route 95 and caused $5,000 in damage, [119] while flooding in Scottsdale caused $25,000 in damage. [120] Meanwhile, in New Mexico, rainfall in Roswell reached 3 in (80 mm). One person drowned along the Rio Grande in New Mexico. In Albuquerque, thunderstorms downed trees and flooded several streets. Property damage in New Mexico reached $85,000. [121]

Tropical Storm Niala

Tropical storm (SSHWS)
Niala 2015-09-25 2020Z.jpg   Niala 2015 track.png
DurationSeptember 25 – September 28
Peak intensity65 mph (100 km/h) (1-min)  992  mbar  (hPa)

On September 20, a tropical disturbance was identified southeast of Hawaii, moving westward south of the subtropical ridge. The disturbance slowly organized and became Tropical Depression Six-C on September 25. The system was upgraded into Tropical Storm Niala soon after as it headed west-northwest towards Hawaii, prompting the issuance of a tropical storm watch for the Big Island. Despite moving over very warm waters, a mid- to upper-level low-pressure system well northeast of the Hawaiian islands inflicted moderate wind shear over Niala, causing it to struggle to intensify. Eventually, at 18:00 UTC on September 26, Niala achieved peak intensity with winds of 65 mph (100 km/h) and a central pressure of 992 mbar (hPa; 29.29 inHg). The detrimental effects of the wind shear soon began to show as Niala slowed and turned westwards away from Hawaii, with the low-level circulation becoming exposed as thunderstorms were sheared to the east. On September 28, Niala weakened to a tropical depression, and became a post-tropical low by September 29. The shallow remnant cyclone turned to the southwest under the influence of the low-level trade winds, dissipating by October 1. [122]

Hurricane Marty

Category 1 hurricane (SSHWS)
Marty 2015-09-28 1735Z.jpg   Marty 2015 track.png
DurationSeptember 26 – September 30
Peak intensity80 mph (130 km/h) (1-min)  987  mbar  (hPa)

A tropical wave, the northern portion of which led to the formation of the Atlantic's Tropical Depression Nine, emerged off the western coast of Africa on September 10. Steered steadily westward, the wave entered the East Pacific where deep convection coalesced around a well-defined center; this led to the formation of a tropical depression about 335 mi (540 km) southwest of Acapulco, Mexico by 18:00 UTC on September 26. The depression intensified into Tropical Storm Marty six hours later as it drifted north. Amid an environment conducive for strengthening, Marty reached hurricane intensity at 12:00 UTC on September 28 and attained peak intensity with winds of 80 mph (130 km/h) and a pressure of 987 mbar (hPa; 29.15 inHg) shortly thereafter. Wind shear abruptly increased following peak intensity, causing the cyclone to weaken quickly; it was downgraded to a tropical storm at 06:00 UTC on September 29 and degenerated into a remnant low a day later. The low eventually dissipated south of the Mexico coastline on October 4. [26]

Heavy rains and flooding from the remnants of Marty rendered 35,000 people homeless in Sonora. Flooding in Guaymas damaged 800 homes and 400 vehicles; three people sustained injuries. [123] Damage in the city reached 500 million pesos (US$30 million). Rains from Marty also caused several landslides in Guerrero, as well as flooding that damaged 300 homes west of Acapulco and injured two. [26]

Hurricane Oho

Category 2 hurricane (SSHWS)
Oho 2015-10-06 2310Z.jpg   Oho 2015 track.png
DurationOctober 3 – October 8
Peak intensity110 mph (175 km/h) (1-min)  957  mbar  (hPa)

In an uncommon occurrence characteristic of El Niño years, a slow-moving disturbance detached from a monsoon trough southeast of Hawaii and became Tropical Depression Seven-C on October 3. The system became Tropical Storm Oho shortly after as it tracked to the east-northeast. Under southwesterly wind shear, Oho failed to intensify over the next day or so while moving erratically, eventually settling on a generally northeastward path. On October 5, convection finally began to cover the low-level circulation center, allowing Oho to strengthen. Following further improvement of the storm's structure as seen on infrared and microwave satellite imagery, the CPHC declared Oho a hurricane at 12:00 UTC on October 6. Accelerating northeastwards, Oho reached peak intensity as a strong Category 2 hurricane on October 7, with winds of 110 mph (175 km/h) and a minimum pressure of 957 mbar (hPa; 28.26 inHg). Immediately after, the combination of southwesterly wind shear and cooler sea surface temperatures caused Oho to begin a weakening trend. Oho transitioned to an extratropical cyclone by 12:00 UTC on October 8 as its winds dropped below hurricane-force. The extratropical remnant of Oho later regained hurricane-force winds due to strong baroclinicity, before moving over Alaska in a weakened state on October 10 and dissipating a few hours later. [124]

Tropical Depression Eight-C

Tropical depression (SSHWS)
08C 2015-10-04 2155Z.jpg   08-C 2015 track.png
DurationOctober 3 – October 4
Peak intensity35 mph (55 km/h) (1-min)  1001  mbar  (hPa)

On September 30, a tropical disturbance developed from a monsoon trough well east of the International Date Line. At that time, the system was about 1,035 mi (1,665 km) southwest of Hawaii. Slowly organizing over the next few days, the CPHC started to issue advisories on the system on October 3 and designated it as Tropical Depression Eight-C. Shortly after, however, increasing southerly wind shear prevented the storm from intensifying to a tropical storm and caused its convection to collapse. With the low-level circulation being displaced to the south of the quickly dissipating convection, the CPHC issued its final advisory on the next day. Eight-C's remnants slowly drifted west-northwestward, crossing the Date Line on October 6 and dissipating a few hours later. [125] The Japan Meteorological Agency, however, maintained the remnant system as a tropical depression when it crossed the Date Line. [126]

Tropical Storm Nora

Tropical storm (SSHWS)
Nora 2015-10-11 2020Z.jpg   Nora 2015 track.png
DurationOctober 9 – October 15
Peak intensity70 mph (110 km/h) (1-min)  993  mbar  (hPa)

A tropical wave departed the coast of Africa on September 19, eventually crossing Central America on October 3. It organized once in the Eastern Pacific, becoming a tropical depression around 12:00 UTC on October 9 and intensifying into Tropical Storm Nora 12 hours later. Moving along a west to west-northwest track, the cyclone entered the Central Pacific on October 11, where favorable environmental conditions allowed it to peak with winds of 70 mph (110 km/h) and a minimum pressure of 993 mbar (hPa; 29.32 inHg), just shy of hurricane strength. Upper-level winds soon became hostile, causing the system to weaken to a tropical depression early on October 14, degenerate to a remnant low late the next day, and ultimately dissipate just southeast of Hawaii around 00:00 UTC on October 16. [127]

The remnants of Nora brought heavy rains to the windward slopes of the Hawaiian Islands on October 16−17. Rainfall totals of 3–6 in (80–200 mm) caused minor flooding on the Big Island, Oahu, and Maui. On the Big Island, excessive surface runoff briefly forced the closure of a portion of Highway 19. [128]

Hurricane Olaf

Category 4 hurricane (SSHWS)
Olaf 2015-10-20 1054Z.jpg   Olaf 2015 track.png
DurationOctober 15 – October 27
Peak intensity150 mph (240 km/h) (1-min)  938  mbar  (hPa)

A broad low-pressure area formed well south of Mexico late on October 9. At first, it showed some signs of organization, but convection associated with the system soon diminished as it tracked steadily westwards. Eventually the system reorganized, and by October 15, it had gained enough organization to be designated as Tropical Depression Nineteen-E. The depression organized very slowly due to its elongated circulation, and only became a tropical storm two days later, upon which the NHC named it Olaf. Soon after, Olaf began to rapidly intensify amid very favorable environmental conditions and became a hurricane on October 18, with hints of an eye starting to appear within a small central dense overcast. [32] Located at just 9.3°N, it broke the record for the lowest-latitude hurricane formation in the Eastern Pacific basin since reliable records began in 1971. [30] Olaf's intensification rate increased further overnight, and the next day, Olaf became a major hurricane with a well-defined pinhole eye. [32] At 9.8°N, it broke the record for the lowest-latitude major hurricane formation in the Eastern Pacific basin as well. [31] Six hours later, Olaf was upgraded to a Category 4 hurricane, the eighth of the season. Moving west-northwestwards, Olaf reached peak intensity with 150 mph (240 km/h) winds and a pressure of 938 mbar (hPa; 27.70 inHg), just as it crossed into the Central Pacific basin. [32]

After maintaining peak intensity for 12 hours, Olaf weakened to Category 3 status as it underwent an eyewall replacement cycle and encountered some dry mid-level air. Although the eye reappeared on satellite as the eyewall cycle completed, another one began while northwesterly wind shear increased, causing Olaf to weaken below major hurricane status while being pulled to the north by a passing trough. However, Olaf's northward movement resulted in a respite in shear, allowing Olaf to reintensify to a secondary peak intensity of 120 mph (195 km/h) on October 23. The next day, decreasing sea surface temperatures and another increase in wind shear finally began to weaken the storm for good. Despite maintaining a ragged eye until October 25, a further increase in wind shear from an approaching trough caused Olaf to weaken to a tropical storm while accelerating it to the east. On October 26, Olaf re-entered the Eastern Pacific, becoming the first storm on record to cross into the Central Pacific and turn back into the Eastern Pacific while still a tropical cyclone. The last of Olaf's deep convection continued to be sheared away, and the system became post-tropical on October 27 while still producing gale-force winds. Olaf's shallow remnants gradually weakened and turned back to the southwest, before dissipating on October 28. [32]

Hurricane Patricia

Category 5 hurricane (SSHWS)
Patricia 2015-10-23 1730Z.jpg   Patricia 2015 track.png
DurationOctober 20 – October 24
Peak intensity215 mph (345 km/h) (1-min)  872  mbar  (hPa)

Tropical Depression Twenty-E formed from a broad low-pressure area off the southwestern coast of Mexico on October 20. It only slowly intensified at first, becoming Tropical Storm Patricia later that day. Entering an atmosphere highly conducive to rapid deepening on October 21, Patricia organized rapidly, and became a hurricane late that day. On October 22, explosive intensification occurred, and in only 24 hours, Patricia became a Category 5 hurricane with 175 mph (280 km/h) winds. [34] The intensification rate rivaled those of Hurricane Linda in 1997 and Hurricane Wilma in 2005. Patricia subsequently attained winds of 215 mph (345 km/h) and a central pressure of 872 mbar (hPa; 25.75 inHg), becoming the strongest tropical cyclone ever recorded in the Western Hemisphere, surpassing both the previous central pressure record set by Hurricane Wilma and the previous 1-minute sustained wind record set by Hurricane Allen. Afterwards, as it approached and later passed over Western Mexico, Patricia weakened even more rapidly than it intensified; just 30 hours after peaking in intensity, it was downgraded to a remnant low at 18:00 UTC on October 24. [129] However, Patricia's landfall near Cuixmala, Jalisco as a Category 4 hurricane with winds of 150 mph (240 km/h), was still sufficient to qualify as the strongest landfall by any Pacific hurricane. [34]

The precursor disturbance to Patricia brought heavy rain to Central America and parts of Mexico from October 18–20. [34] Approximately 223,000 people were affected by flooding and six were killed: four in El Salvador, one in Guatemala, and one in Nicaragua. [130] [131] [132] [133] Damage in Chetumal, Mexico reached 1.4 billion pesos (US$85.3 million). [134] As a tropical cyclone, Patricia caused severe impacts when it made landfall in Jalisco, Mexico, killing six and causing at least 5.4 billion pesos (US$325 million) in damage. [34] An additional fatality occurred during evacuations in Jalisco. [135] In Emiliano Zapata and Chamela, the villages most badly affected by Patricia, violent winds tore off roofs, toppled concrete power poles and transmission lines, and defoliated trees. Hillsides were left barren and most small structures were severely damaged or completely destroyed. [34] Mexico's agricultural sector also suffered, with 42,000  ha (100,000  ac) of crops affected by Patricia, of which 15,000 ha (37,000 ac) were deemed a total loss. [136] The papaya, banana, and plantain crops took the most damage. [34] The low death toll despite Patricia's landfall intensity was credited to the hurricane's small size, the low population density of the landfall area, as well as effective evacuations. [137] The remnants of Patricia's upper-level circulation later produced rains in South Texas, [138] causing flash floods that left $52.5 million in damage. [139] [140]

Tropical Storm Rick

Tropical storm (SSHWS)
Rick 2015-11-19 2015Z.jpg   Rick 2015 track.png
DurationNovember 18 – November 22
Peak intensity40 mph (65 km/h) (1-min)  1002  mbar  (hPa)

A tropical wave moved off the western coast of Africa on November 3, entering the East Pacific roughly two weeks later. The disturbance encountered a persistent area of convection in the Intertropical Convergence Zone, eventually coalescing into a tropical depression by 12:00 UTC on November 18 while located 715 mi (1,150 km) south-southeast of the southern tip of Baja California. Plagued by moderate southeasterly wind shear, the depression slowly intensified into Tropical Storm Rick and simultaneously attained peak intensity with winds of 40 mph (65 km/h) and a pressure of 1002 mbar (hPa; 29.59 inHg) by 12:00 UTC on November 19. The cyclone failed to intensify further as it tracked west-northwest within a dry environment, weakening to a tropical depression by 06:00 UTC on November 22 and further degenerating into a remnant low 12 hours later. The low tracked northwest and eventually southwest prior to dissipating early on November 26. [141]

Hurricane Sandra

Category 4 hurricane (SSHWS)
Sandra 2015-11-25 Suomi-NPP.png   Sandra 2015 track.png
DurationNovember 23 – November 28
Peak intensity150 mph (240 km/h) (1-min)  934  mbar  (hPa)

A tropical wave that emerged off the west coast of Africa on November 6 entered the Eastern Pacific on November 21. The system organized and was classified as a tropical depression on November 23 well south of Mexico. Environmental conditions, including high sea surface temperatures and low wind shear, were highly conducive to intensification and the storm quickly organized, becoming Tropical Storm Sandra early on November 25. A small central dense overcast developed atop the storm and Sandra reached hurricane status early on November 25 after the consolidation of an eye. The hurricane achieved its peak as a Category 4 hurricane with winds of 150 mph (240 km/h) and a pressure of 934 mbar (hPa; 27.58 inHg) early on November 26. This made Sandra the strongest November hurricane on record in the Northeastern Pacific, surpassing Hurricane Kenneth in 2011. Thereafter, increasing shear degraded the hurricane's structure and weakening ensued. Rapid weakening took place on November 27 and Sandra's circulation became devoid of convection as it diminished to a tropical storm that evening. The cyclone degenerated into a remnant low soon thereafter and ultimately dissipated just off the coast of Sinaloa, Mexico, on November 29. [36]

As the precursor to Sandra traversed Central America, it produced unseasonably heavy rainfall that triggered flooding and landslides. Four people died in various incidents related to the system: three in El Salvador and one in Honduras. [142] Initially expecting a landfalling storm, officials in Northwestern Mexico prepared equipment for power outages, closed schools, and evacuated 180 residents. [143] Sandra's effects largely consisted of light to moderate rainfall; some traffic accidents and landslides resulted from this, though the overall impacts were limited. [36] [144]

Tropical Depression Nine-C

Tropical depression (SSHWS)
09C 2015-12-31 Suomi NPP.png   09-C 2015 track.png
DurationDecember 31 – December 31
Peak intensity35 mph (55 km/h) (1-min)  1001  mbar  (hPa)

Despite the official end of the hurricane season about a month prior, a westerly wind burst in the equatorial waters of the Central Pacific led to the development of a tropical disturbance on December 27. Moving slowly eastward, the disturbance stayed in an environment with anomalously high sea surface temperatures and ample ocean heat content associated with the ongoing El Niño event, allowing thunderstorms in the system to develop and persist. Turning northwards, the system formed a low-level closed circulation and continued to slowly organize. At 00:00 UTC on December 31, Tropical Depression Nine-C formed at a very low latitude of 2.2°N. Moving slowly westwards, Nine-C never reached tropical storm strength due to its proximity to the equator and the presence of 20-knot vertical wind shear over the system, leaving the 2015 season one storm shy of the record from 1992. As convection in and around the depression was rapidly sheared to the west, the depression was unable to support itself and was downgraded into a remnant low at 00:00 UTC on January 1, 2016, marking the latest end to a Pacific hurricane season on record. The remnant low dissipated later that day. [10]

Storm names

The following names were used to name storms that formed in the Eastern Pacific Ocean within the National Hurricane Center's area of responsibility during 2015. [145] This is the same list used in the 2009 season.

  • Rick
  • Sandra
  • Terry (unused)
  • Vivian (unused)
  • Waldo (unused)
  • Xina (unused)
  • York (unused)
  • Zelda (unused)

For storms that form in the Central Pacific Hurricane Center's area of responsibility, encompassing the area between 140°W and the International Date Line, all names are used in a series of four rotating lists. [146] The next nine names that were slated for use are shown below. Eight of these names were used throughout the course of the season. This season has seen more named storms that formed in the Central Pacific basin than any other season on record. [23]

  • Kilo
  • Loke
  • Malia
  • Niala
  • Oho
  • Pali (unused)

Operationally, Kilo was thought to have formed on August 20, and hence received a name before Loke, which formed on August 21. Kilo's date of formation was shifted to August 22 after post-storm analysis. [20]

Retirement

On April 25, 2016, at the 38th session of the RA IV Hurricane Committee, the World Meteorological Organization officially retired the name Patricia due to its extreme intensity and the amount of damage and deaths that it caused, and it will not be used again for another Pacific hurricane. Patricia will be replaced with Pamela for the 2021 Pacific hurricane season. [147]

Season effects

This is a table of all the storms that have formed in the 2015 Pacific hurricane season. It includes their duration, names, landfall(s), denoted in parentheses, damages, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but were still related to that storm. Damage and deaths include totals while the storm was extratropical, a wave, or a low, and all the damage figures are in 2015 USD.

Saffir–Simpson scale
TDTSC1C2C3C4C5
2015 Pacific hurricane season statistics
Storm
name
Dates activeStorm category

at peak intensity

Max 1-min
wind
mph (km/h)
Min.
press.
(mbar)
Areas affectedDamage
(USD)
DeathsRefs
AndresMay 28 – June 4Category 4 hurricane145 (230)937 Southwestern United States NoneNone
Blanca May 31 – June 9Category 4 hurricane145 (230)936Western Mexico, Baja California Peninsula, Southwestern United States$134 thousand4
Carlos June 10 – 17Category 1 hurricane90 (150)978Southwestern Mexico, Western Mexico$1.04 millionNone
ElaJuly 8 – 10Tropical storm45 (75)1002NoneNoneNone
Halola July 10 – 12Tropical storm60 (95)998NoneNoneNone
IuneJuly 10 – 13Tropical storm40 (65)1004NoneNoneNone
DoloresJuly 11 – 19Category 4 hurricane130 (215)946Southwestern Mexico, Western Mexico, Baja California Peninsula, Southwestern United States$50.477 million1
EnriqueJuly 12 – 18Tropical storm50 (85)1000NoneNoneNone
FeliciaJuly 23 – 25Tropical storm40 (65)1004NoneNoneNone
Eight-EJuly 27 – 29Tropical depression35 (55)1006NoneNoneNone
GuillermoJuly 29 – August 7Category 2 hurricane110 (175)967 Hawaii, Northern California NoneNone
HildaAugust 6 – 14Category 4 hurricane145 (230)937HawaiiNoneNone
Eleven-EAugust 16 – 17Tropical depression35 (55)1003NoneNoneNone
LokeAugust 21 – 26Category 1 hurricane75 (120)985HawaiiNoneNone
KiloAugust 22 – September 1Category 4 hurricane140 (220)940Hawaii, Johnston Atoll NoneNone
IgnacioAugust 25 – September 5Category 4 hurricane145 (230)942Hawaii, Western Canada NoneNone
JimenaAugust 26 – September 9Category 4 hurricane155 (250)932NoneNoneNone
KevinAugust 31 – September 5Tropical storm60 (95)998Baja California Peninsula, Southwestern United StatesNoneNone
Linda September 5 – 10Category 3 hurricane125 (205)950 Sinaloa, Oaxaca, Zacatecas, Southwestern United States$3.59 million22
MaliaSeptember 18 – 22Tropical storm50 (85)992HawaiiNoneNone
Sixteen-ESeptember 20 – 21Tropical depression35 (55)1001Baja California Peninsula, Northwestern Mexico, Southwestern United States$17.8 million1
NialaSeptember 25 – 28Tropical storm65 (100)992HawaiiNoneNone
Marty September 26 – 30Category 1 hurricane80 (130)987Southwestern Mexico, Western Mexico$30 millionNone
OhoOctober 3 – 8Category 2 hurricane110 (175)957 Western Canada, Alaska NoneNone
Eight-COctober 3 – 4Tropical depression35 (55)1001NoneNoneNone
NoraOctober 9 – 15Tropical storm70 (110)993NoneNoneNone
OlafOctober 15 – 27Category 4 hurricane150 (240)938NoneNoneNone
Patricia October 20 – 24Category 5 hurricane215 (345)872 Central America, Mexico, Texas $462.8 million8 (5)
RickNovember 18 – 22Tropical storm40 (65)1002NoneNoneNone
Sandra November 23 – 28Category 4 hurricane150 (240)934Central America, Baja California Peninsula, Northwestern MexicoMinor4
Nine-CDecember 31Tropical depression35 (55)1001NoneNoneNone
Season Aggregates
31 systemsMay 28 – December 31 215 (345)872$566 million40 (5) 

See also

Notes

  1. 1 2 A major hurricane is one that reaches at least Category 3 status on the Saffir–Simpson scale.
  2. All damage totals are in 2015 USD unless otherwise stated.
  3. The totals represent the sum of the squares for every (sub)tropical storm's intensity of over 33 knots (38 mph, 61 km/h), divided by 10,000. Calculations are provided at Talk:2015 Pacific hurricane season/ACE calcs.

Related Research Articles

2004 Pacific hurricane season Period of formation of tropical cyclones in the Eastern Pacific Ocean in 2004

The 2004 Pacific hurricane season was notable in that no tropical cyclone of at least tropical storm intensity moved ashore, an unusual occurrence. The season officially began on May 15 in the eastern Pacific, and on June 1 in the central Pacific; it officially ended in both basins on November 30. These dates conventionally delimit the period during each year when a majority of tropical cyclones form. Activity throughout the year fell slightly below the long-term average, with 12 named storms, 6 hurricanes, and 3 major hurricanes. The season was reflected by an Accumulated Cyclone Energy (ACE) index of 71 units.

2005 Pacific hurricane season hurricane season in the Pacific Ocean

The 2005 Pacific hurricane season continued the trend of generally below-average activity that began a decade prior. The season officially began on May 15 in the eastern Pacific, and on June 1 in the central Pacific; it lasted until November 30 in both basins. These dates conventionally delimit the period during each year when most tropical cyclones form in the northeastern Pacific Ocean. Activity began with the formation of Hurricane Adrian, the fourth-earliest-forming tropical storm on record in the basin at the time. Adrian led to flash flooding and several landslides across Central America, resulting in five deaths and $12 million in damage. Tropical storms Calvin and Dora caused minor damage along the coastline, while Tropical Storm Eugene led to one death in Acapulco. In early October, Otis produced tropical storm-force winds and minor flooding across the Baja California peninsula. The remnants of Tropical Depression One-C in the central Pacific, meanwhile, caused minor impacts in Hawaii. The strongest storm of the period was Hurricane Kenneth, which attained peak winds of 130 mph (215 km/h) over the open Pacific. Cooler than average ocean temperatures throughout the year aided in below-average activity through the course of the season, which ended with 15 named storms, 7 hurricanes, 2 major hurricanes, and an Accumulated cyclone energy index of 75 units.

2001 Pacific hurricane season hurricane season in the Pacific Ocean

The 2001 Pacific hurricane season was a near average season. The most notable storm that year was Hurricane Juliette, which caused devastating floods in Baja, California, leading to 12 fatalities and $400 million worth of damage. Two other storms were notable in their own rights, Hurricane Adolph became the strongest May Hurricane until 2014 when both records set by Adolph and Juliette were broken by Hurricanes Amanda and Odile. Tropical Storm Barbara passed just north of Hawaii, bringing minimal impact. The season officially began on May 15, 2001 in the eastern Pacific, and on June 1, 2001 in the central Pacific, and lasted until November 30, 2001. These dates conventionally delimit the period of each year when most tropical cyclones form in this part of the Pacific Ocean. The first storm developed on May 25, while the last storm dissipated on November 3.

1999 Pacific hurricane season hurricane season in the Pacific Ocean

The 1999 Pacific hurricane season was one of the least active Pacific hurricane seasons on record. The season officially began on May 15 in the Eastern Pacific, and on June 1 in the Central Pacific; in both basins, it ended on November 30. These dates conventionally delimit the period during which most tropical cyclones form in the northeastern Pacific Ocean. The first tropical cyclone of the season, Hurricane Adrian, developed on June 18, while the final storm of the season, Tropical Storm Irwin, dissipated on October 11. No storms developed in the Central Pacific during the season. However, two storms from the Eastern Pacific, Dora and Eugene, entered the basin, with the former entering as a hurricane.

1993 Pacific hurricane season hurricane season in the Pacific Ocean

The 1993 Pacific hurricane season was a slightly above-average Pacific hurricane season with seven named storms directly impacting land. The season officially started on May 15 in the eastern Pacific, and on June 1 in the central Pacific, and ended on November 30; these dates conventionally delimit the period during which most tropical cyclones form in the northeastern Pacific Ocean. The first tropical cyclone developed on June 11, over a month after the traditional start of the season. The final named storm of the season, Tropical Storm Norma, dissipated on October 14. The Central Pacific Ocean saw very little tropical activity, with only one cyclone, Hurricane Keoni, developing in that particular region. However, many storms out of the season crossed the threshold into the Central Pacific, many as hurricanes, and even major hurricanes.

1989 Pacific hurricane season hurricane season in the Pacific Ocean

The 1989 Pacific hurricane season officially started on May 15, 1989, in the eastern Pacific, and June 1, 1989, in the central Pacific, and lasted until November 30, 1989. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean. A total of 17 storms and 9 hurricanes formed, which was near long-term averages. Four hurricanes reached major hurricane status on the Saffir-Simpson Hurricane Scale.

1985 Pacific hurricane season hurricane season in the Pacific Ocean

The 1985 Pacific hurricane season is the third-most active Pacific hurricane season on record. It officially started on May 15, 1985, in the eastern Pacific, and on June 1, 1985, in the central Pacific, and lasted until November 30, 1985. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean. At the time, the 1985 season was the most active on record in the eastern north Pacific, with 28 tropical cyclones forming. Of those, 24 were named, 13 reached hurricane intensity, and 8 became major hurricanes by attaining Category 3 status or higher on the Saffir-Simpson Hurricane Scale. At that time, the 24 named storms was a record; however, this record was broken seven years later in 1992, and was therefore recognized as the second busiest season within the basin, until it was surpassed exactly thirty years later by the 2015 season.

1983 Pacific hurricane season hurricane season in the Pacific Ocean

The 1983 Pacific hurricane season was the longest season ever recorded at that time, which was later surpassed by the 2015 and 2016 seasons. The 1983 Pacific hurricane season started on May 15, 1983 in the eastern Pacific, and on June 1, 1983 in the central Pacific, and lasted until November 30, 1983. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean. During the 1983 season, there were 21 named storms, which was slightly less than the previous season. Furthermore, eight storms reached major hurricane status, or Category 3 or higher on the Saffir–Simpson hurricane wind scale (SSHWS). The decaying 1982–83 El Niño event likely contributed to this level of activity. That same El Niño influenced a very quiet Atlantic hurricane season.

2007 Pacific hurricane season hurricane season in the Pacific Ocean

The 2007 Pacific hurricane season was a below-average Pacific hurricane season, featuring one major hurricane. The season officially started on May 15 in the eastern Pacific and on June 1 in the central Pacific, and ended on November 30; these dates conventionally delimit the period during which most tropical cyclones form in the region. The first tropical cyclone of the season, Alvin, developed on May 27, while the final system of the year, Kiko, dissipated on October 23. Due to unusually strong wind shear, activity fell short of the long-term average, with a total of 11 named storms, 4 hurricanes, and 1 major hurricane. At the time, 2007 featured the second-lowest value of the Accumulated cyclone energy (ACE) index since reliable records began in 1971. Two tropical cyclones – Cosme and Flossie – crossed into the central Pacific basin during the year, activity below the average of 4 to 5 systems.

2008 Pacific hurricane season hurricane season in the Pacific Ocean

The 2008 Pacific hurricane season was a near average hurricane season. It officially started May 15, 2008 in the eastern Pacific, started on June 1, 2008 in the central Pacific, and lasted until November 30, 2008. This season is the first since 1996 to have no cyclones cross into the central Pacific. Activity this year was near average, with 16 storms forming in the Eastern Pacific proper and an additional 1 in the Central Pacific. There were 7 hurricanes, a low number compared to the typical 9, and only 2 major hurricanes, unlike the typical 5. There were only a few notable storms this year. Tropical Storm Alma made landfall along the Pacific coast of Nicaragua, becoming the first known storm to do so. It killed 9 and did US$35 million in damage. It also became the first tropical storm to be retired in the Eastern Pacific basin. Hurricane Norbert became the strongest hurricane to hit the western side of the Baja Peninsula on record, killing 25.

Hurricane Daniel (2006)

Hurricane Daniel was the second strongest hurricane of the 2006 Pacific hurricane season. The fourth named storm of the season, Daniel originated on July 16 from a tropical wave off the coast of Mexico. It tracked westward, intensifying steadily to reach peak winds of 150 mph (240 km/h) on July 22. At the time, the characteristics of the cyclone resembled those of an annular hurricane. Daniel gradually weakened as it entered an area of cooler water temperatures and increased wind shear, and after crossing into the Central Pacific Ocean, it quickly degenerated into a remnant low-pressure area on July 26, before dissipating two days later.

2012 Pacific hurricane season hurricane season in the Pacific Ocean

The 2012 Pacific hurricane season was a moderately active Pacific hurricane season that saw an unusually high number of tropical cyclones pass west of the Baja California Peninsula. The season officially started on May 15 in the eastern Pacific, and on June 1 in the central Pacific, and ended on November 30; these dates conventionally delimit the period during which most tropical cyclones form in the northeastern Pacific Ocean. However, with the formation of Tropical Storm Aletta on May 14 the season slightly exceeded these bounds.

2013 Pacific hurricane season hurricane season in the Pacific Ocean

The 2013 Pacific hurricane season was the costliest Pacific hurricane season on record, with a total of about $4.2 billion in damages. The season produced above normal activity; however, the majority of the storms were weak. The season officially began on May 15, 2013 in the Eastern Pacific and started on June 1, 2013 in the Central Pacific. Both ended on November 30, 2013. These dates conventionally delimit the period of each year when most tropical cyclones form in the eastern Pacific basin. However, the formation of a storm is possible at any time.

2014 Pacific hurricane season hurricane season in the Pacific Ocean

The 2014 Pacific hurricane season was the fifth-busiest season since reliable records began in 1949, alongside the 2016 season. The season officially started on May 15 in the East Pacific Ocean, and on June 1 in the Central Pacific; they both ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin.

2016 Pacific hurricane season hurricane season in the Pacific Ocean

The 2016 Pacific hurricane season was tied as the fifth-most active season on record, alongside the 2014 season. Throughout the course of the year, a total of 22 named storms, 13 hurricanes and six major hurricanes were observed within the basin. Although the season was very active, it was considerably less active than the previous season, with large gaps of inactivity at the beginning and towards the end of the season. It officially started on May 15 in the eastern Pacific, and on June 1 in the central Pacific; they both ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin. However, as illustrated by Hurricane Pali, which became the earliest Central Pacific tropical cyclone on record, the formation of tropical cyclones is possible at any time of the year. After Pali, however, the active season had a slow start, becoming the first season since 2011 in which no tropical cyclones occurred in May, and also the first since 2007 in which no named storms formed in the month of June.

Timeline of the 2010 Pacific hurricane season

The 2010 Pacific hurricane season was one of the least active seasons on record, featuring the fewest named storms since 1977. The season officially started on May 15 in the eastern Pacific—east of 140°W—and on June 1 in the central Pacific—between the International Date Line and 140°W—and lasted until November 30. These dates typically cover the period of each year when most tropical cyclones form in the eastern Pacific basin. The season's first storm, Tropical Storm Agatha, developed on May 29; the season's final storm, Tropical Storm Omeka, degenerated on December 21.

2018 Pacific hurricane season Period of formation of tropical cyclones in the Eastern Pacific Ocean in 2018

The 2018 Pacific hurricane season produced the highest accumulated cyclone energy (ACE) value on record. With 23 named storms, it was the fourth-most active season on record, tied with 1982. The season officially began on May 15 in the eastern Pacific, and on June 1 in the central Pacific; they both ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin, as illustrated when the first tropical depression formed on May 10.

Hurricane Olivia (2018)

Hurricane Olivia was the first tropical cyclone to make landfall on Maui and Lanai in recorded history. The fifteenth named storm, ninth hurricane, and sixth major hurricane of the 2018 Pacific hurricane season, Olivia formed southwest of Mexico on September 1. The depression slowly organized and strengthened into Tropical Storm Olivia on the next day. Olivia then began a period of rapid intensification on September 3, reaching its initial peak on September 5. Soon after, Olivia began a weakening trend, before re-intensifying on September 6. On the next day, Olivia peaked as a Category 4 hurricane, with winds of 130 mph and a minimum central pressure of 951 mbar. Six hours later, Olivia began another weakening trend that resulted in the hurricane being downgraded to Category 1 status on September 8, east of the 140th meridian west. On September 9, Olivia entered the Central Pacific Basin. Over the next couple of days, Olivia prompted the issuance of Tropical Storm Watches and Warnings for Hawaii County, Oahu, Maui County, and Kauai County. Olivia weakened into a tropical storm on September 11, before making brief landfalls in northwest Maui and Lanai on the next day, becoming the first tropical cyclone to impact the islands in recorded history. Tropical storm-force winds mainly affected Maui County and Oahu. Torrential rains affected the same area from September 11 to 13, causing flash flooding. Olivia caused a total of US$25 million in damages. Olivia was downgraded to a tropical depression on September 13 while continuing to head west. Due to wind shear disrupting Olivia's convection, the system weakened into a remnant low on September 14. Olivia crossed into the West Pacific Basin on September 19 as a remnant low, before dissipating later that day.

References

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