2017 Pacific hurricane season

Last updated
2017 Pacific hurricane season
2017 Pacific hurricane season summary map.png
Season summary map
Seasonal boundaries
First system formedMay 9, 2017
(record earliest in the East Pacific)
Last system dissipatedOctober 28, 2017
Strongest storm
NameFernanda
  Maximum winds145 mph (230 km/h)
(1-minute sustained)
  Lowest pressure948 mbar (hPa; 27.99 inHg)
Seasonal statistics
Total depressions20
Total storms18
Hurricanes9
Major hurricanes
(Cat. 3+)
4
Total fatalities45 total
Total damage$69.78 million (2017 USD)
Related articles
Pacific hurricane seasons
2015, 2016, 2017, 2018, 2019

The 2017 Pacific hurricane season was a moderately active Pacific hurricane season, featuring eighteen named storms, nine hurricanes, and four major hurricanes, though the season was significantly less active than the previous three seasons. Despite the considerable amount of activity, most of the storms were weak and short-lived. 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 basin. However, the formation of tropical cyclones is possible at any time of the year. This was demonstrated when the first storm, Tropical Storm Adrian, was named on May 10, and became the earliest-known tropical storm in the East Pacific since the advent of satellite imagery. The season saw near-average activity in terms of Accumulated Cyclone Energy (ACE), in stark contrast to the extremely active seasons in 2014, 2015, and 2016; and for the first time since 2012, no tropical cyclones formed in the Central Pacific basin. However, for the third year in a row, the season featured above-average activity in July, with the ACE value being the fifth highest for the month.

Pacific hurricane mature tropical cyclone that develops within the eastern and central Pacific Ocean

A Pacific hurricane is a mature tropical cyclone that develops within the eastern and central Pacific Ocean to the east of 180°W, north of the equator. For tropical cyclone warning purposes, the northern Pacific is divided into three regions: the eastern, central, and western, while the southern Pacific is divided into 2 sections, the Australian region and the southern Pacific basin between 160°E and 120°W. Identical phenomena in the western north Pacific are called typhoons. This separation between the two basins has a practical convenience, however, as tropical cyclones rarely form in the central north Pacific due to high vertical wind shear, and few cross the dateline.

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.

2014 Pacific hurricane season hurricane season in the Pacific Ocean

The 2014 Pacific hurricane season was a very active year, with 22 named storms developing, ranking it as 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.

Contents

Beginning in 2017, the National Hurricane Center has the option to issue advisories, and thus allow watches and warnings to be issued, on disturbances that are not yet tropical cyclones but have a high chance to become one, and are expected to bring tropical storm or hurricane conditions to landmasses within 48 hours. Such systems are classified as "Potential Tropical Cyclones". [1] This was first demonstrated in the East Pacific basin on August 29, with the designation of Potential Tropical Cyclone Fourteen-E—which later developed into Tropical Storm Lidia—south-southeast of the Baja California Peninsula.

National Hurricane Center division of the United States National Weather Service

The National Hurricane Center (NHC) is the division of the United States' National Weather Service responsible for tracking and predicting tropical weather systems between the Prime Meridian and the 140th meridian west poleward to the 30th parallel north in the northeast Pacific Ocean and the 31st parallel north in the northern Atlantic Ocean. The agency, which is co-located with the Miami branch of the National Weather Service, is situated on the campus of Florida International University in University Park, Florida.

Tropical cyclone warnings and watches are two levels of alert issued by national weather forecasting bodies to coastal areas threatened by the imminent approach of a tropical cyclone of tropical storm or hurricane intensity. They are notices to the local population and civil authorities to make appropriate preparation for the cyclone, including evacuation of vulnerable areas where necessary. It is important that interests throughout the area of an alert make preparations to protect life and property, and do not disregard it on the strength of the detailed forecast track. Tropical cyclones are not points, and forecasting their track remains an uncertain science.

Tropical Storm Lidia (2017) Pacific tropical storm in 2017

Tropical Storm Lidia was a large tropical cyclone that produced flooding in Baja California Peninsula and parts of western Mexico. The fourteenth tropical cyclone and twelfth named storm of the 2017 Pacific hurricane season, Lidia developed from a large area of disturbed weather west of the Pacific Coast of Mexico on August 31. The storm intensified while moving generally northward or northwestward, peaking with maximum sustained winds of 65 mph (100 km/h) later that day. On September 1, Lidia made landfall in Mexico near Puerto Chale, Baja California Sur, at peak intensity. The storm weakened while traversing the peninsula, ultimately emerging over the Pacific Ocean on September 3, where the storm degenerated into a remnant low. The system brought thunderstorms and wind gusts to Southern California, before dissipating on September 4.

Seasonal forecasts

RecordNamed
storms
HurricanesMajor
hurricanes
Ref
Average (1981–2010):15.47.63.2 [2]
Record high activity: 1992: 27 2015: 16 2015: 11 [3]
Record low activity: 2010: 8 2010: 3 2003: 0 [3]
DateSourceNamed
storms
HurricanesMajor
hurricanes
Ref
May 25, 2017 NOAA 142061137 [4]
May 29, 2017 SMN 16106 [5]
AreaNamed
storms
HurricanesMajor
hurricanes
Ref
Actual activity:EPAC1894
Actual activity:CPAC000
Actual activity:1894

On May 25, 2017, the National Oceanic and Atmospheric Administration released its annual forecast, predicting an 80% chance of a near- to above-average season in both the Eastern and Central Pacific basins, with a total of 1420 named storms, 611 hurricanes, and 37 major hurricanes. [nb 1] [4] During May 28, the Servicio Meteorológico Nacional (SMN) issued its first forecast for the season, predicting a total of 16 named storms, 10 hurricanes, and 6 major hurricanes to develop. [5]

National Oceanic and Atmospheric Administration An American scientific agency within the US Department of Commerce that focuses on the oceans and the atmosphere

The National Oceanic and Atmospheric Administration is an American scientific agency within the United States Department of Commerce that focuses on the conditions of the oceans, major waterways, and the atmosphere.

Seasonal summary

Tropical Storm Selma (2017)Hurricane Max (2017)Tropical Storm Lidia (2017)Saffir–Simpson scale2017 Pacific hurricane season

The Accumulated Cyclone Energy (ACE) for the 2017 Pacific hurricane season was 100.12 units (99.065 units from the East Pacific and 1.055 units from the Central Pacific). [nb 2]

Tropical Storms Greg (left), Irwin (center), and Hurricane Hilary (right) spanning the East Pacific on July 24 Greg, Hilary and Irwin 2017-07-24 2212Z.jpg
Tropical Storms Greg (left), Irwin (center), and Hurricane Hilary (right) spanning the East Pacific on July 24

Although hurricane season in the eastern Pacific does not officially begin until May 15, and only begins on June 1 in the central Pacific, [6] activity began several days prior with the formation of a tropical depression on May 9. This marked the earliest formation of a tropical cyclone in the basin, surpassing 1990's Hurricane Alma. [7] It intensified into Tropical Storm Adrian a few hours later, marking the earliest formation of a named storm on record. [8] Near normal activity occurred in June, with Tropical Storm Calvin formed on June 11, and Hurricane Dora on June 25. [9] For the third year in a row, July featured above average activity, with the fifth highest ACE value for that month on record. [10] This total was due to long-lived hurricanes Eugene, Fernanda, Hilary, and Irwin. August saw significantly less activity, with only three storms forming in the month; however it featured Hurricane Kenneth, the third major hurricane of the season. September featured four storms, including Hurricane Otis, which became the fourth major hurricane of the season. Only two storms formed after October 1, Ramon and Selma. Both did not attain hurricane status, though Selma became the first and last storm to make landfall in El Salvador. No systems were active in November for the first time since the 2010 season.[ citation needed ]

2010 Pacific hurricane season hurricane season in the Pacific Ocean

The 2010 Pacific hurricane season is the least active Pacific hurricane season, alongside 1977, since reliable records began in 1971. It officially started on May 15, 2010 for the eastern Pacific, and June 1 for the central Pacific, and officially ended on November 30. Unlike the previous season, the first storm of the season, Agatha, formed during the month of May. Agatha developed on May 29 near the coast of Guatemala. In the second week of June, a sudden spree of tropical cyclones developed, and between June 16 and 22, four cyclones formed, including the two major hurricanes of the season, Celia and Darby, the first of which reached Category 5 intensity. However, following the record active June, July saw zero named storms. In August and September only 2 tropical storms and one hurricane formed. Tropical Depression Eleven-E caused a great deal of flooding in southern Mexico, causing millions of dollars in damage, as well as causing over 50 deaths and $500 million in damage in areas of Oaxaca and Guatemala. Tropical Storm Omeka was a rare off-season storm.

Systems

Tropical Storm Adrian

Tropical storm (SSHWS)
Adrian 2017-05-09 1912Z.jpg   Adrian 2017 track.png
DurationMay 9 – May 10
Peak intensity45 mph (75 km/h) (1-min)  1004  mbar  (hPa)

On May 5, the National Hurricane Center (NHC) indicated that an area of low pressure was forecast to form south of Mexico over subsequent days, with the possibility of tropical cyclone development thereafter. [11] A broad cyclonic circulation began to develop as expected late on May 7, [12] gradually organizing into the season's first tropical depression by 21:00 UTC on May 9. [13] Upon formation, at which point it was located about 545 mi (875 km) south-southeast of Salina Cruz, Mexico, the depression became the earliest-forming East Pacific tropical cyclone (east of 140°W) on record. The previous record was held by 1990's Hurricane Alma, which formed on May 12. [7] The depression intensified into Tropical Storm Adrian six hours later, the earliest-known formation of a named storm in eastern Pacific proper since the advent of the satellite era. [14] Initially, forecasts expected the small storm to intensify into a powerful hurricane. Shortly after reaching peak intensity early on May 10, an unexpected increase in mid-level wind shear caused Adrian to quickly weaken and degenerate to a remnant low by 00:00 UTC on May 11. [15] Adrian's remnant low persisted for another day, before dissipating on May 12. [15]

Atmospheric circulation The large-scale movement of air, a process which distributes thermal energy about the Earths surface

Atmospheric circulation is the large-scale movement of air, and together with ocean circulation is the means by which thermal energy is redistributed on the surface of the Earth.

Salina Cruz Municipality and town in Oaxaca, Mexico

Salina Cruz is a major seaport on the Pacific coast of the Mexican state of Oaxaca. It is the state's third-largest city and is the municipal seat of the municipality of the same name. It is part of the Tehuantepec District in the west of the Istmo Region. The city had a 2005 census population of 71,314, while its municipality, with an area of 113.55 km2 (43.84 sq mi) had a population of 76,219, the state's fourth-largest municipality in population.

Wind shear

Wind shear, sometimes referred to as wind gradient, is a difference in wind speed or direction over a relatively short distance in the atmosphere. Atmospheric wind shear is normally described as either vertical or horizontal wind shear. Vertical wind shear is a change in wind speed or direction with change in altitude. Horizontal wind shear is a change in wind speed with change in lateral position for a given altitude.

Tropical Storm Beatriz

Tropical storm (SSHWS)
Beatriz 2017-06-01 1710Z.jpg   Beatriz 2017 track.png
DurationMay 31 – June 2
Peak intensity45 mph (75 km/h) (1-min)  1001  mbar  (hPa)

A tropical wave emerged off the western coast of Africa on May 18 and entered the East Pacific about a week later, where steady organization led to the formation of a tropical depression around 12:00 UTC on May 31. Embedded within southwesterly flow around a large upper-level trough across northern Mexico, the depression moved steadily northeast in a favorable environment, and it intensified into Tropical Storm Beatriz by 06:00 UTC on June 1. After attaining peak winds of 45 mph (75 km/h), the system made landfall around 00:00 UTC on June 2 about 25 miles (40 km) west of Puerto Ángel before the mountainous terrain of Mexico quickly made Beatriz dissipate inland twelve hours later. [16]

In the state of Oaxaca, flights out of Bahías de Huatulco International Airport were cancelled and schools were closed until June 3. Dozens of roads were impassable due to mudslides and flooding; numerous locales received over 4 in (102 mm) of rain, with rainfall at a maximum of 19.07 in (484.4 mm) in Huatulco. [16] Numerous landslides caused significant disruption across the state; the storm blocked large areas of Federal Highway 200 in Oaxaca. A landslide in San Marcial Ozolotepec killed two girls and buried several houses, while another in San Carlos Yautepec killed a woman. [17] As of June 4, a total of seven people have been killed—five in Oaxaca and two in Tehuantepec. [18] Damage within the country were about US$10 million. [19]

Tropical Storm Calvin

Tropical storm (SSHWS)
Calvin 2017-06-12 2000Z.jpg   Calvin 2017 track.png
DurationJune 11 – June 13
Peak intensity45 mph (75 km/h) (1-min)  1004  mbar  (hPa)

In the second week of June, the NHC forecast the development of a broad area of low pressure a few hundred miles south of Mexico over the next several days. [20] This prediction came to fruition on June 9, [21] and the fledgling disturbance steadily organized into a tropical depression by 12:00 UTC on June 11 while located about 150 mi (240 km) south-southeast of Salina Cruz. [22] It was slow to organize initially due to moderate easterly wind shear as it drifted northwestwards; [23] by 18:00 UTC on June 12, however, the tropical depression intensified into Tropical Storm Calvin. [22] Intensifying slightly to reach winds of 45 mph (75 km/h), [22] Calvin made landfall halfway between Salina Cruz and Puerto Ángel, near Paja Blanca, around 00:00 UTC on June 13. [24] Just 12 hours later, Calvin dissipated into a remnant low. [22] The remnants of the storm caused heavy rainfall and some flooding in the area, [25] however no fatalities were reported. [22] Less than two weeks after Tropical Storm Beatriz, Calvin affected similar areas of Mexico and inflicted additional damage which resulted in at least 70 million pesos (US$3.88 million) in Oaxaca. [26]

Hurricane Dora

Category 2 hurricane (SSHWS)
Dora 2017-06-26 2020Z.jpg   Dora 2017 track.png
DurationJune 24 – June 28
Peak intensity105 mph (165 km/h) (1-min)  974  mbar  (hPa)

A large gyre developed over Central America around June 15. A trough detached from the gyre and drifted across just south of the Gulf of Tehuantepec between June 21 and June 23. By June 23, a tropical wave associated with the remnants of Tropical Storm Bret in the Atlantic began merging with the trough. A surface low formed early on the next day, followed by the development of a tropical depression at 18:00 UTC. Initially located about 230 mi (370 km) south-southeast of Acapulco, the depression moved west-northwestward due to a mid-tropospheric ridge, which stretched from northern Mexico westward into nearby Pacific waters. At 06:00 UTC on June 25, the depression intensified into Tropical Storm Dora. Thereafter, favorable conditions including low wind shear and warm sea surface temperatures allowed Dora to undergo rapid intensification, becoming a hurricane at 06:00 UTC on June 26 and a Category 2 hurricane about six hours later. [27]

With impressive outflow and an eye apparent on satellite imagery, [28] the storm peaked with maximum sustained winds of 105 mph (165 km/h) and a minimum barometric pressure of 974 mbar (28.8 inHg) by 18:00 UTC June 26. Dora remained a Category 2 hurricane for about 12 more hours before beginning to rapidly weaken over cooler sea surface temperatures and in an environment of drier air, falling to Category 1 intensity at 06:00 UTC on June 27 and deteriorating to a tropical storm around 18:00 UTC. The storm later degenerated into a remnant low near Socorro Island early on June 28, after all of the storm's convection had been diminished. The remnant low moved slowly over the eastern Pacific before dissipating early on July 1. [27] The outer bands of Dora brought heavy rains to Guerrero, resulting in flash floods that inundated 20 homes. Overall damage was minor, however. [29]

Hurricane Eugene

Category 3 hurricane (SSHWS)
Eugene 2017-07-09 1815Z.jpg   Eugene 2017 track.png
DurationJuly 7 – July 12
Peak intensity115 mph (185 km/h) (1-min)  966  mbar  (hPa)

Hurricane Eugene developed from a disturbance located 765 mi (1,230 km) south of the southern tip of the Baja California Peninsula on July 7. [30] On the following day, Eugene underwent a period of rapid intensification; in an 18-hour period starting at 21:00 UTC on July 8, Eugene intensified from a tropical storm with 70 mph (110 km/h) winds to a Category 3 hurricane with 115 mph (185 km/h) winds, making it the first major hurricane of the season. [31] [32] However, by 12 hours later, the entrainment of dry air caused Eugene to weaken to a Category 2 hurricane, [33] and due to traveling over cooler waters, Eugene weakened to a tropical storm on the following day. [34] As the coverage of deep convection steadily dwindled, Eugene fell to tropical depression intensity around 15:00 UTC on July 12, and degenerated to a remnant low six hours later. [35] [36]

Dangerous rip currents combined with swells of 4 to 8 ft (1.2 to 2.4 m) across southern California resulted in hundreds of rescues. On July 10 alone, lifeguards in Huntington Beach made 200 rescues while 600 were made in Los Angeles County; lifeguards also responded to 700 medical emergencies. [37]

Hurricane Fernanda

Category 4 hurricane (SSHWS)
Fernanda 2017-07-14 2135Z.jpg   Fernanda 2017 track.png
DurationJuly 12 – July 22
Peak intensity145 mph (230 km/h) (1-min)  948  mbar  (hPa)

Late on July 10, the NHC began monitoring a broad area of low pressure several hundred miles southwest of Manzanillo. Contrary to predictions of gradual development, [38] the disturbance rapidly organized into a tropical depression by 03:00 UTC on July 12, [39] and further strengthened to become Tropical Storm Fernanda around 15:00 UTC that day. [40] The nascent cyclone initially battled moderate northeasterly wind shear, with its low-level circulation displaced to the northeastern edge of the deep convection. [41] This period of unfavorable upper-level winds was short-lived, and soon afterwards Fernanda commenced a period of rapid intensification, intensifying into a hurricane at 21:00 UTC on July 13. [42] A well-defined eye formed within a growing central dense overcast, and Fernanda further intensified into a major hurricane early on July 14. [43] Only six hours later, the system was upgraded to a Category 4 hurricane. [44] At 10.9°N, Fernanda became the second strongest hurricane to occur at such a low latitude in the Eastern Pacific, only behind 2015's Hurricane Olaf. [45]

With expansive upper-level outflow and spiral bands, a distinct eye, and a symmetric central dense overcast, Fernanda attained peak winds of 145 mph (230 km/h) around 03:00 UTC on July 15. [46] A series of microwave passes around that time began to indicate the formation of a secondary eyewall that halted the cyclone's development as it tracked west-northwest to northwest. [47] The eyewall replacement cycle concluded early on July 16, allowing Fernanda to remain a powerful hurricane amid favorable environmental conditions. [48] By late on July 18, however, cooler ocean temperatures and a more stable environment prompted the storm's weakening trend. [49] Fernanda fell below hurricane intensity shortly before entering the Central Pacific as it succumbed to stronger southwesterly wind shear, [50] becoming a tropical depression at 03:00 UTC on July 21, [51] and after failing to produce sustained deep convection, degenerated to a remnant low about 500 miles (805 km) east of Hilo, Hawaii, by 21:00 UTC on July 22. [52]

Tropical Depression Eight-E

Tropical depression (SSHWS)
08E 2017-07-17 2105Z.jpg   08E 2017 track.png
DurationJuly 17 – July 20
Peak intensity35 mph (55 km/h) (1-min)  1007  mbar  (hPa)

A low-pressure trough began producing disorganized convection over the waters of the Pacific Ocean, well to the south of Baja California Peninsula, on July 14. [53] Despite only marginally conducive environmental conditions, the disturbance began to show signs of organization two days later, [54] and it attained tropical depression status by 06:00 UTC on July 17. [55] Strong west-northwesterly wind shear confined the storm's intermittent bursts of convection well to the southwest of its low-level circulation, and the depression consequently failed to produce winds above 35 mph (55 km/h). [56] The system's center later degenerated into a low-pressure trough within the Intertropical Convergence Zone, prompting the NHC to discontinue advisories at 21:00 UTC on July 20. [57]

Tropical Storm Greg

Tropical storm (SSHWS)
Greg 2017-07-20 Aqua.jpg   Greg Pacific 2017 track.png
DurationJuly 17 – July 26
Peak intensity60 mph (95 km/h) (1-min)  1000  mbar  (hPa)

On July 12, the NHC forecast the formation of a broad area of low pressure south of Mexico over subsequent days. [58] The disturbance formed two days later and slowly organized into a tropical depression by 15:00 UTC on July 17. [59] [60] The tropical cyclone battled strong west-northwesterly wind shear after formation, intensifying into Tropical Storm Greg by 09:00 UTC on July 18, as deep convection burst near the center. However, the storm remained in a steady state for several days thereafter, despite continued predictions of intensification. [61] [62] Ultimately, given global models' poor handling of the environment, NHC lowered their intensity forecast for Greg. [63] The cyclone continued west for the remainder of its life and maintained a similar convective structure, with intermittent bursts of deep convection near the center. [64] Approaching the Central Pacific, Greg's low-level circulation became increasingly difficult to locate as it moved into a cooler, drier environment intertwined by increasing southerly wind shear, and the system weakened to a tropical depression around 21:00 UTC on July 25. [65] It degenerated to a remnant low 24 hours later. [66]

Hurricane Hilary

Category 2 hurricane (SSHWS)
Hilary 2017-07-25 2015Z.jpg   Hilary 2017 track.png
DurationJuly 21 – July 30
Peak intensity110 mph (175 km/h) (1-min)  969  mbar  (hPa)

Part of an exceptionally active July, the NHC began highlighting the far eastern reaches of the Pacific basin on July 19 for tropical development in later days. [67] A large area of disturbed weather progressed westward across Costa Rica later that day, [68] steadily organizing into a tropical depression by 15:00 UTC on July 21. [69] The cyclone failed to organize immediately after formation, and its low-level center migrated to the southern extent of associated convection. [70] By 03:00 UTC on July 23, though, better defined banding features and a more organized convective structure led the NHC to designate the system as Tropical Storm Hilary. [71] Over the coming hours, the cyclone's convective structure evolved into a small central dense overcast while hints of an eye became apparent; [72] in accordance with satellite estimates, Hilary was upgraded to a hurricane at 09:00 UTC on July 24. [73] A moist environment and warm ocean waters propelled Hilary to its peak as a Category 2 hurricane with winds of 110 mph (175 km/h) 24 hours later, at which time its core was most symmetric. [74] After maintaining its intensity, the hurricane began to weaken late on July 26 as northerly wind shear increased. [75] It fell back to tropical storm intensity around 03:00 UTC on July 27, and ultimately degenerated to a remnant low four days later. [76] [77]

Hurricane Irwin

Category 1 hurricane (SSHWS)
Irwin 2017-07-25 2120Z.jpg   Irwin 2017 track.png
DurationJuly 22 – August 1
Peak intensity90 mph (150 km/h) (1-min)  979  mbar  (hPa)

On July 16, the NHC highlighted the expected formation of an area of low pressure south of Mexico later that week. [78] A tropical wave began producing disorganized cloudiness three days later, [67] and the broad system slowly organized into a tropical depression by 15:00 UTC on July 22. [79] Its structure changed little after formation, impinged by strong wind shear; despite this, satellite wind data indicated the cyclone intensified into Tropical Storm Irwin by 09:00 UTC on July 23. [80] Over the next 24 hours, deep convection began to wrap around the center and a mid-level eye formed as environmental conditions improved; [81] by 09:00 UTC on July 25, Irwin intensified into a hurricane. [82] Although coolest cloudtops were located in the western semicircle of the system, a well-defined eye and convection in the eyewall propelled Irwin to its peak with winds of 90 mph (150 km/h) late on July 25. [83] Almost immediately, outflow from nearby Hurricane Hilary increased wind shear over the system and caused it to begin weakening; [84] Irwin rapidly fell to tropical storm strength around 15:00 UTC on July 26. [85] Contrary to projections of continued weakening, however, the storm's cloud pattern maintained or even improved over subsequent days as it passed over marginal ocean temperatures. [86] Finally, after losing its deep convection and being reduced to a swirl of low-level clouds, Irwin was declared a remnant low around 21:00 UTC on August 1. [87]

Tropical Depression Eleven-E

Tropical depression (SSHWS)
11E 2017-08-04 2030Z.jpg   11E 2017 track.png
DurationAugust 4 – August 5
Peak intensity35 mph (55 km/h) (1-min)  1006  mbar  (hPa)

On July 28, the NHC noted the possibility of an area of low pressure well south of Mexico developing over subsequent days. [88] An area of disorganized showers and thunderstorms associated with a tropical wave materialized three days later, but little change occurred thereafter. [89] Early on August 3, a surface circulation formed in association with concentrating convection, [90] and this process led to the formation of a tropical depression by 06:00 UTC the next day. [91] The newly formed cyclone did not intensify after designation, and its low- and mid-level circulations separated by over 265 mi (425 km) on August 5 due strong easterly wind shear. [92] Falling short of the tropical storm criteria, the short-lived depression was declared a remnant low at 18:00 UTC that day. [91] The lingering vortex slowed its northwestward motion and executed a counter-clockwise loop, before dissipating completely 205 miles (335 km) southwest of the Baja California Peninsula on August 8. [91]

Tropical Storm Jova

Tropical storm (SSHWS)
Jova 2017-08-12 2110Z.jpg   Jova 2017 track.png
DurationAugust 12 – August 14
Peak intensity40 mph (65 km/h) (1-min)  1003  mbar  (hPa)

The NHC began monitoring a strong tropical wave over the eastern Caribbean on August 3. [93] The feature pushed westward, developing into Hurricane Franklin before making landfall on the Yucatán, [94] and attaining its peak as a Category 1 hurricane before making landfall near Vega de Alatorre, Veracruz on August 10. [95] Although its low-level circulation dissipated, the NHC in days prior noted the potential for Franklin's mid-level remnants to reform in the East Pacific. [96] The remnants of Franklin induced a surface low off the coast of southwestern Mexico on August 11, and steady organization led to the formation of Tropical Storm Jova by 03:00 UTC the next day. [97] On a westward course, Jova was plagued by strong wind shear from an area of high pressure over northwestern Mexico, with a very disorganized appearance on satellite. [98] After lacking sufficient organization to be declared a tropical cyclone, the storm was declared a remnant low around 03:00 UTC on August 14. [99]

Hurricane Kenneth

Category 4 hurricane (SSHWS)
Kenneth 2017-08-21 1015Z.jpg   Kenneth 2017 track.png
DurationAugust 18 – August 23
Peak intensity130 mph (215 km/h) (1-min)  951  mbar  (hPa)

On August 12, the NHC noted the potential for an area of low pressure to form well south of Baja California Peninsula during the following days. [100] A large area of disturbed weather developed two days later as predicted; [101] however, organization was slow to occur, and a tropical depression only formed four days later, around 15:00 UTC on August 18. [102] The newly formed cyclone embarked on a west to west-northwest course, intensifying into Tropical Storm Kenneth early on August 19 and further into a hurricane by 15:00 UTC on August 20. [103] Despite forecasts of only slight additional intensification, [104] Kenneth rapidly intensified, with the eye feature warming dramatically and the surrounding cloud tops cooling. The cyclone attained major hurricane strength around 03:00 UTC on August 21, [105] and six hours later reached its peak as a Category 4 hurricane with sustained winds of 130 mph (215 km/h). [106] Progressively cooler sea surface temperatures and increasing wind shear caused Kenneth to steadily weaken following the intensification trend, with its inner core eroding and low-level circulation becoming displaced. [107] By 21:00 UTC on August 22, the storm weakened below hurricane strength. [108] On the following day, at 21:00 UTC, Kenneth was declared to be post-tropical.

Tropical Storm Lidia

Tropical storm (SSHWS)
Lidia 2017-08-31 2024Z.jpg   Lidia 2017 track.png
DurationAugust 30 – September 3
Peak intensity65 mph (100 km/h) (1-min)  986  mbar  (hPa)

A vigorous tropical wave emerged off the western coast of Africa on August 16; it crossed Central America into the East Pacific on August 25. Part of a large cyclonic gyre, the disturbance failed to organize for several days—despite already producing tropical storm-force winds—amid high wind shear from Hurricane Harvey in the Gulf of Mexico. After Harvey weakened, however, an increase in the system's organization led to the formation of Tropical Storm Lidia around 18:00 UTC on August 30. Flow between a subtropical high and upper-level trough directed Lidia on a north-northwest track, and the cyclone strengthened to a peak of 65 mph (100 km/h) later on August 31. Lidia passed very close to Cabo San Lucas early the next morning, and interaction with the high terrain of Baja California Sur caused the storm to weaken slightly; it made its first landfall near Punta Marquez with winds of 60 mph (95 km/h) around 12:00 UTC, and its second landfall near Punta Abreojos early on September 2 with winds of 45 mph (75 km/h). Lidia continued to weaken as it moved northwest, degenerating to a remnant low around 06:00 UTC on September 3 and dissipating twelve hours later. [109]

Hurricane Otis

Category 3 hurricane (SSHWS)
Otis 2017-09-17 1915Z.jpg   Otis 2017 track.png
DurationSeptember 11 – September 19
Peak intensity115 mph (185 km/h) (1-min)  965  mbar  (hPa)

On September 8, Atlantic Hurricane Katia made landfall in Mexico, dissipating on September 9. However, its mid-level circulation survived, and eventually spawned an area of low pressure off the coast of Mexico. On September 11, the system organized into Tropical Depression Fifteen-E. [110] During the next several days the depression slowly drifted westward. Situated within a dry environment, it struggled to intensify for nearly a week, and some models even predicted the depression would dissipate without ever reaching tropical storm strength. [111] However, by 15:00 UTC on September 16, the system unexpectedly started to organize with a small area of deep convection developing near its low-level center, which allowed it to finally strengthen into Tropical Storm Otis later on the same day. [112] While only marginal strengthening was forecast, Otis unexpectedly rapidly intensified into a Category 2 hurricane by 15:00 UTC on September 17, despite low ocean temperatures, dry air, and increased wind shear. [113] Otis continued to intensify into a Category 3 major hurricane by 03:00 UTC on September 18, developing a well-defined eye with a diameter of 12 mi (19 km). [114] Then by 21:00 UTC on the same day, Otis had rapidly degenerated back into a tropical storm with maximum sustained winds of 45 mph (70 km/h). [115] Twelve hours after developing a well-defined eye, Otis started weakening at a remarkable rate, [116] losing most of its deep convection due to low ocean surface temperatures, until it weakened into a remnant low on September 19. [117]

Hurricane Max

Category 1 hurricane (SSHWS)
Max 2017-09-14 1705Z.jpg   Max 2017 track.png
DurationSeptember 13 – September 15
Peak intensity90 mph (150 km/h) (1-min)  980  mbar  (hPa)

On September 9, the NHC mentioned the possibility for an area of low pressure to form south of Mexico over later days. [118] A trough of low pressure materialized the next day, [119] steadily organizing into a tropical depression near the southwestern coast of Mexico around 15:00 UTC on September 13. Despite forecasts of little or no intensification, [120] the newly formed cyclone intensified into Tropical Storm Max six hours later. [121] Quick intensification ensued as the storm improved in structure and developed a well-defined eye, prompting the NHC to upgrade Max to a hurricane around 12:00 UTC on September 14. [122] Max attained peak winds of 90 mph (150 km/h), [123] while making landfall on the coastline of Guerrero. The mountainous terrain of inland Mexico severely disrupted Max's circulation, causing it to degenerate by 09:00 UTC on September 15. [124]

In preparation for Max, about 788 people evacuated to temporary shelters. [125] Throughout Guerrero, over 1,500 homes were inundated by floodwaters or damaged by strong winds that ripped off roofs. Over 100 trees were downed, mudslides and sinkholes closed several roads (including Mexican Federal Highway 200), and telephone service was cut. At the height of the storm, 126,503 Comisión Federal de Electricidad customers lost electricity. A bridge between Cruz Grande and Copala was severely damaged, and access to Juchitán de Zaragoza was severed due to a flooded highway. One of 17 rapidly-rising rivers swept away a residence and two neighbors who attempted to rescue the homeowner; one of the neighbors died, constituting one of two deaths attributed to the storm. At least 3,000 residents across five municipalities in Guerrero were stranded. [125] [126] Waves of 10–16 ft (3–5 m) battered the coastline, where six ships were sunk. [127] Damage from the hurricane was estimated to be around US$13 million. [128]

Hurricane Norma

Category 1 hurricane (SSHWS)
Norma 2017-09-15 2055Z.jpg   Norma 2017 track.png
DurationSeptember 14 – September 20
Peak intensity75 mph (120 km/h) (1-min)  985  mbar  (hPa)

On September 10, the NHC started to monitor an area of low pressure — associated with the tropical wave that spawned Hurricane Irma in the Atlantic basin — well south of Manzanillo, Mexico. [129] [130] The disturbance gradually organized during the following days and by 09:00 UTC on September 14 the system was noted to develop a well-defined center and spiral banding. [131] This led to the formation of Tropical Storm Norma, operationally skipping tropical depression status. [132] In post-season analysis, it was determined that Norma had formed as a tropical depression three hours earlier, and that it did not strengthen into a tropical storm until 12:00 UTC. [130] The newly formed tropical storm continued to intensify at a steady pace while it moved slowly northward, becoming a Category 1 hurricane by 00:00 UTC on September 16 and reaching winds of 75 mph (120 km/h). [130] At this time warnings were being issued for the southern portions of the Baja California Peninsula as Norma was forecast to become a significant hurricane and make landfall in the area. [133] However, its broad circulation and the entrainment of dry air quickly became an impediment in doing so. [134] Norma then weakened back to a tropical storm at 12:00 UTC later that day while becoming stationary, though a developing ridge over Mexico began to move the storm slowly towards the north. [130] Norma maintained its intensity the next day and continued being slowly steered by the ridge towards a northwesterly to west-northwesterly path, all tropical storm warnings were discontinued as Norma started to shift its track more to the west. [135] The cyclone continued weakening for several days as it slowly drifted to the west, until finally degenerating into a remnant low at 03:00 UTC on September 20. [130] The remnants of Norma persisted for a little over 2 days before they completely dissipated. [130]

Tropical Storm Pilar

Tropical storm (SSHWS)
Pilar 2017-09-24 1740Z.jpg   Pilar 2017 track.png
DurationSeptember 23 – September 25
Peak intensity50 mph (85 km/h) (1-min)  1000  mbar  (hPa)

During the week of September 18, the NHC began monitoring a tropical wave, [136] as it spawned a broad area of low pressure located offshore of the southwestern coast of Mexico. [137] The disturbance lacked any significant organization until September 23 at around 21:00 UTC when the system was noted to developed surface winds of over 35 mph (55 km/h) becoming Tropical Depression Eighteen-E. [138] The depression organized into a tropical storm six hours later and was given the name Pilar, the sixteenth named storm of the annual Pacific hurricane season. [139] Thereafter, despite having a disorganized appearance on satellite, Pilar's winds increased in strength, and it reached its peak with sustained winds of 50 mph (85 km/h). [140] By 09:00 UTC on September 24, Pilar continued to track north along the coast, with warnings being issued for the southwestern coast of Mexico. [141] However, early on September 25, these warnings were discontinued, [142] as Tropical Storm Pilar showed signs of weakening mainly due to land interaction, and was reduced to a tropical depression before ultimately dissipating at around 21:00 UTC later that same day. [143] Although Pilar did not make landfall as a tropical cyclone, heavy rainfall was reported in Puerto Vallarta, Mexico, to the northeast of Islas Marías, and in other areas along the Mexican coastline. [144]

Tropical Storm Ramon

Tropical storm (SSHWS)
Ramon 2017-10-04 1945Z.jpg   Ramon 2017 track.png
DurationOctober 3 – October 4
Peak intensity45 mph (75 km/h) (1-min)  1002  mbar  (hPa)

On October 3, the NHC noted a high chance of tropical development in an area of low pressure, to the south of Mexico. [145] The system increased in intensity and became Tropical Storm Ramon later on the same day, skipping tropical depression status. [146] Due to wind shear from a large anticyclone to its north, the storm did not intensify much further. [147] Although Ramon was forecast to linger over open waters as it moved westward, this did not occur and the system quickly grew disorganized. [148] Ramon weakened into a tropical depression on October 4, having lasted as a tropical storm only for 18 hours. [149] As it moved westward, Ramon continued to weaken, until it finally degenerated into a trough of low pressure by 00:00 UTC the following day. [150] The National Hurricane Center issued its last advisory on the degenerated system at 09:00 UTC, on October 5. [151]

Tropical Storm Selma

Tropical storm (SSHWS)
Selma 2017-10-27 1950Z.jpg   Selma 2017 track.png
DurationOctober 27 – October 28
Peak intensity40 mph (65 km/h) (1-min)  1004  mbar  (hPa)

Late on October 24, the NHC began to monitor the formation of an area of low pressure located south of eastern Central America. [152] The system quickly gained organization as it moved northwestwards, [153] and was declared Tropical Storm Selma at 09:00 UTC on October 27. [154] This marked only the second time that an Eastern Pacific tropical cyclone became a tropical storm east of 90°W, the other being Alma of 2008. [154] With the environment thought to be generally conducive to intensification, Selma was forecast to gain some strength before moving northwards into Central America. However, with wind shear stronger than expected, [155] this did not materialize, and Selma never strengthened beyond minimal tropical storm status. [156] Eventually, at 12:00 UTC on October 28, Selma made landfall just southeast of San Salvador, El Salvador, [157] becoming the first Eastern Pacific tropical cyclone to make landfall anywhere in El Salvador. [158] Once over land, Selma weakened quickly, and degenerated into a post-tropical cyclone by 21:00 UTC on October 28. Selma's remnant dissipated overland within the next several hours. [159]

Heavy rains produced by Selma and a cold front resulted in flooding that killed seven people in Honduras. Dozens of landslides damaged homes and blocked roadways while 13 rivers topped their banks. Approximately 38,000 people required evacuation and more than 3,000 homes were flooded as 13 rivers topped their banks. [160] Rainfall extended into Nicaragua, causing floods that claimed another 10 lives in areas recovering from Tropical Storm Nate. [161]

Storm names

The following names were used for named storms that formed in the northeastern Pacific Ocean during 2017. No names were retired, so this list will be used again in the 2023 season. [162] This same list was used in the 2011 season.

  • Adrian
  • Beatriz
  • Calvin
  • Dora
  • Eugene
  • Fernanda
  • Greg
  • Hilary
  • Irwin
  • Jova
  • Kenneth
  • Lidia
  • Max
  • Norma
  • Otis
  • Pilar
  • Ramon
  • Selma
  • Todd (unused)
  • Veronica (unused)
  • Wiley (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 degrees west and the International Date Line, all names are used in a series of four rotating lists. [163] The next four names that were slated for use in 2017 are shown below; however, none of them were used.

  • Walaka (unused)
  • Akoni (unused)
  • Ema (unused)
  • Hone (unused)

The usage of the name "Hilary" in July garnered some negative attention relating to former U.S. Presidential candidate Hillary Clinton. People also took to Twitter to poke fun at the name and at Clinton with political jokes. [164]

Season effects

This is a table of all the storms that formed in the 2017 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 tropical wave, or a low, and all the damage figures are in 2017 USD.

Saffir–Simpson scale
TDTSC1C2C3C4C5
2017 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
AdrianMay 9 – 10Tropical storm45 (75)1004NoneNoneNone
BeatrizMay 31 – June 2Tropical storm45 (75)1001Southwestern Mexico $10 million7
CalvinJune 11 – 13Tropical storm45 (75)1004Southwestern Mexico, Guatemala $3.88 millionNone
DoraJune 25 – 28Category 2 hurricane105 (165)974Southwestern MexicoMinimalNone
EugeneJuly 7 – 12Category 3 hurricane115 (185)966 Baja California Peninsula, California NoneNone
FernandaJuly 12 – 22Category 4 hurricane145 (230)948 Hawaii NoneNone
Eight-EJuly 17 – 20Tropical depression35 (55)1007NoneNoneNone
GregJuly 17 – 26Tropical storm60 (95)1000NoneNoneNone
HilaryJuly 21 – 30Category 2 hurricane110 (175)969Southwestern MexicoNoneNone
IrwinJuly 22 – August 1Category 1 hurricane90 (150)979NoneNoneNone
Eleven-EAugust 4 – 5Tropical depression35 (55)1006NoneNoneNone
JovaAugust 12 – 14Tropical storm40 (65)1003Western MexicoNoneNone
KennethAugust 18 – 23Category 4 hurricane130 (215)951NoneNoneNone
Lidia August 31 – September 3Tropical storm65 (100)986Western Mexico, Baja California Peninsula, Arizona, California$36.1 million18 (2)
OtisSeptember 11 – 19Category 3 hurricane115 (185)965NoneNoneNone
Max September 13 – 15Category 1 hurricane90 (150)980Southern Mexico$19.8 million1
NormaSeptember 14 – 20Category 1 hurricane75 (120)985Baja California PeninsulaNoneNone
PilarSeptember 23 – 25Tropical storm50 (85)1000Western MexicoMinimalNone
RamonOctober 3 – 4Tropical storm45 (75)1002Southern MexicoNoneNone
Selma October 27 – 28Tropical storm40 (65)1004 Nicaragua, Costa Rica, El Salvador, Guatemala, Honduras Unknown17
Season Aggregates
20 systemsMay 9 
October 28
 145 (230)948$69.8 million43 (2) 

See also

Footnotes

  1. A major hurricane is a storm that ranks as Category 3 or higher on the Saffir–Simpson scale.
  2. 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:2017 Pacific hurricane season/ACE calcs.

Related Research Articles

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.

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.

2011 Pacific hurricane season hurricane season in the Pacific Ocean

The 2011 Pacific hurricane season was a below-average Pacific hurricane season and was the first season since 2009 that featured no depressions or named storms in the month of May. It had six major hurricanes which was above average for a Pacific hurricane season. The season officially started on May 15, 2011, for the eastern Pacific, and started on June 1, 2011, for the central Pacific, both of which ended on November 30, 2011. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin. A total of 11 named storms were observed, which is below average.

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.

2015 Pacific hurricane season hurricane season in the Pacific Ocean

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. 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.

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.

Hurricane Dora (2011) Category 4 Pacific hurricane in 2011

Hurricane Dora was the strongest tropical cyclone in the northeastern Pacific in 2011. Dora developed from a tropical wave south of Honduras on July 18. Moving northwestward in favorable conditions, the system quickly intensified to tropical storm status and attained hurricane intensity the next day. Rapid intensification ensued shortly thereafter, bringing the storm to its peak intensity on July 21 as a Category 4 hurricane, with a minimum barometric pressure of 929 mbar and maximum sustained winds of 155 mph (250 km/h). However, the storm's path into an area with cool sea surface temperatures and wind shear caused Dora to quickly deteriorate and weaken. By July 24, Dora had degenerated into a remnant low-pressure area west of the Baja California Peninsula. Dora brought stormy conditions to the southwestern Mexico coast and the Baja California Peninsula throughout its existence. Remaining off the coast from its formation to dissipation, Dora's effects on land were slight. However, the outer rainbands of the hurricane caused flooding and mudslides in southern Mexico and Guatemala, while rough surf toppled a lighthouse and damaged 60 restaurants along the coast. The hurricane's remnants contributed to heightened shower and thunderstorm activity across New Mexico and Arizona in late July.

2017 Atlantic hurricane season hurricane season in the Atlantic Ocean

The 2017 Atlantic hurricane season was a hyperactive, extremely deadly, and catastrophic hurricane season that, with a damage total of at least $282.28 billion (USD), was the costliest tropical cyclone season on record. With over 3,300 deaths, 2017 was the deadliest season since 2005 and also featured the highest total accumulated cyclone energy (ACE). Most of the season's damage was due to three major hurricanes – Harvey, Irma, and Maria. Another notable hurricane, Nate, was the worst natural disaster in Costa Rican history; Harvey, Irma, Maria, and Nate had their names retired due to their high damage costs and loss of life. Featuring 17 named storms, 10 hurricanes, and 6 major hurricanes, the 2017 season ranks alongside 1936 as the fifth-most active season since reliable records began in 1851. The 2017 season had the most major hurricanes since 2005. This season is also one of only six years on record to feature multiple Category 5 hurricanes and the only season other than 2007 with two hurricanes making landfall at that intensity. All ten of the season's hurricanes occurred in a row, the greatest number of consecutive hurricanes in the satellite era, and tied for the highest number of consecutive hurricanes ever observed in the Atlantic basin. Additionally, this season is the only season on record in which three hurricanes each had an ACE of over 40: Irma, Jose, and Maria.

2018 Atlantic hurricane season Hurricane season in the Atlantic ocean

The 2018 Atlantic hurricane season was the third in a consecutive series of above-average and damaging Atlantic hurricane seasons, featuring 15 named storms, 8 hurricanes, and 2 major hurricanes, which caused a total of over $49.975 billion in damages. The season officially began on June 1, 2018, and ended on November 30, 2018. These dates historically describe the period each year when most tropical cyclones form in the Atlantic basin and are adopted by convention. The formation of Tropical Storm Alberto on May 25, marked the fourth consecutive year in which a storm developed before the official start of the season. The next storm, Beryl, became the first hurricane to form in the eastern Atlantic during the month of July since Bertha in 2008. Chris, upgraded to a hurricane on July 10, became the earliest second hurricane in a season since 2005. No hurricanes formed in the North Atlantic during the month of August, marking the first season since 2013, and the eighth season on record, to do so. On September 5, Florence became the first major hurricane of the season. On September 12, Joyce formed, making 2018 the first season since 2008 to feature four named storms active simultaneously. On October 9, Michael became the second major hurricane of the season, and a day later, it became the third-most intense hurricane to make landfall on the United States in terms of pressure, behind the 1935 Labor Day hurricane and Hurricane Camille of 1969. With the formation of Oscar on October 26, the season is the first on record to see seven storms that were subtropical at some point in their lifetimes.

Timeline of the 2013 Pacific hurricane season

The 2013 Pacific hurricane season was an above-average year in which twenty named storms developed. The hurricane season officially began on May 15 in the East Pacific, coinciding with the formation of Tropical Storm Alvin, and on June 1 in the Central Pacific; it ended on November 30 in both basins. These dates conventionally delimit the period during each year when most tropical cyclones form. The final system of the year, Tropical Storm Sonia, dissipated on November 4.

Timeline of the 2014 Pacific hurricane season

The 2014 Pacific hurricane season was an event in the annual cycle of tropical cyclone formation. It officially began on May 15 in the eastern Pacific—defined as the region east of 140°W—and began on June 1 in the central Pacific, defined as the region west of 140°W to the International Date Line; both ended on November 30.

Hurricane Genevieve (2014)

Hurricane Genevieve, also referred to as Typhoon Genevieve, was the fourth-most intense tropical cyclone of the North Pacific Ocean in 2014. A long-lasting system, Genevieve was the first one to track across all three northern Pacific basins since Hurricane Dora in 1999. Genevieve developed from a tropical wave into the eighth tropical storm of the 2014 Pacific hurricane season well east-southeast of Hawaii on July 25. However, increased vertical wind shear caused it to weaken into a tropical depression by the following day and degenerate into a remnant low on July 28. Late on July 29, the system regenerated into a tropical depression, but it weakened into a remnant low again on July 31, owing to vertical wind shear and dry air.

Meteorological history of Hurricane Dennis

The meteorological history of Hurricane Dennis spanned twenty-two days, beginning with its inception as a tropical wave over Africa on June 26, 2005, and terminating with its dissipation on July 18 over the Great Lakes of North America. The incipient wave that became Dennis emerged over the Atlantic Ocean on June 29 and moved briskly to the west. Dry air initially inhibited development, though once this abated the wave was able to consolidate into a tropical depression on July 4. The depression soon crossed Grenada before entering the Caribbean Sea whereupon increasingly favorable environmental factors, such as low wind shear and high sea surface temperatures, fueled intensification. Turning west-northwest, the system achieved tropical storm status on July 5 and hurricane status the following day.

Timeline of the 2017 Pacific hurricane season

The 2017 Pacific hurricane season was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the eastern Pacific Ocean. 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 ended on November 30. These dates typically cover the period of each year when most tropical cyclones form in the eastern Pacific basin.

Tropical Storm Emily (2017)

Tropical Storm Emily was a rapidly-forming tropical cyclone that made landfall on the west coast of Florida. The fifth named storm of the 2017 Atlantic hurricane season, Emily formed from a small area of low pressure that developed along a cold front in late July 2017. Unexpectedly, the low rapidly organized and strengthened into a tropical depression on July 30, and then into a tropical storm early the next day. Emily continued to intensify as it moved eastward, peaking with maximum sustained winds of 60 mph (95 km/h) as it made landfall near Longboat Key on the western Florida coast. The cyclone weakened quickly into a tropical depression shortly after landfall as its circulation became increasingly disrupted. Emerging into the Atlantic Ocean on August 1, Emily continued to weaken as it accelerated northeastward, becoming post-tropical early on August 2.

Meteorological history of Hurricane Harvey

Hurricane Harvey was the costliest tropical cyclone on record, inflicting roughly $125 billion in damages in the affected areas. It lasted from mid-August until early September 2017, with many records for rainfall and landfall intensity set during that time. The eighth named storm, third hurricane, and first major hurricane of the 2017 Atlantic hurricane season, Harvey originated from a broad area of low pressure southwest of Cape Verde that was first detected on August 13. Tracking steadily westward, the disturbance developed strong convection, a well-defined circulation, and sustained tropical storm-force winds, leading to the classification of Tropical Storm Harvey late on August 17. Moderate, easterly vertical wind shear kept Harvey weak, as it continued westwards into the Caribbean Sea; despite repeated predictions for gradual intensification by the National Hurricane Center, Harvey eventually opened up into a tropical wave on August 19. The remnants of Harvey continued to move westwards and reached the Yucatán Peninsula on August 22, and was forecast to regenerate into a tropical cyclone after exiting land.

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 in the Eastern Pacific basin. 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 Bud (2018) Category 4 Pacific hurricane in 2018

Hurricane Bud was a powerful tropical cyclone that produced heavy rainfall and flash flooding across Northwestern Mexico and the Southwestern United States. The second named storm and major hurricane of the 2018 Pacific hurricane season, Bud originated from a tropical wave that departed from Africa on May 29. It then travelled across the Atlantic Ocean before crossing over South America and entering the Northeast Pacific Ocean late on June 6. The system then moved northwest and steadily organized, becoming a tropical depression late on June 9 and Tropical Storm Bud early the next day. Favorable upper-level winds and ample moisture allowed the storm to rapidly intensify to a hurricane late on June 10 and further to a major hurricane on June 11. Bud ultimately peaked the next morning with maximum sustained winds of 140 mph (220 km/h) and a minimum barometric pressure of 943 mbar. It curved north while rapidly succumbing to the effects of ocean upwelling, making landfall on Baja California Sur as a minimal tropical storm early on June 15. On the next day, land interaction and increasing wind shear caused Bud to degenerate to a remnant low, and Bud dissipated completely on June 16.

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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