|2017 Pacific hurricane season|
Season summary map
|First system formed||May 9, 2017|
|Last system dissipated||October 28, 2017|
|• Maximum winds||145 mph (230 km/h)|
|• Lowest pressure||948 mbar (hPa; 27.99 inHg)|
|Total fatalities||45 total|
|Total damage||$375.28 million (2017 USD)|
The 2017 Pacific hurricane season was significantly less active than the previous three Pacific hurricane seasons, featuring eighteen named storms, nine hurricanes, and four major hurricanes. 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. Damage across the basin reached $375.28 million (2017 USD), while 45 people were killed by the various storms.
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". 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.
|Record high activity:||1992: 27||2015: 16||2015: 11|
|Record low activity:||2010: 8||2010: 3||2003: 0|
|May 25, 2017||NOAA||14–20||6–11||3–7|
|May 29, 2017||SMN||16||10||6|
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 14–20 named storms, 6–11 hurricanes, and 3–7 major hurricanes. 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.
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).
Although hurricane season in the eastern Pacific does not officially begin until May 15, and on June 1 in the central Pacific, 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. It intensified into Tropical Storm Adrian a few hours later, marking the earliest formation of a named storm on record. Near normal activity occurred in June, with Tropical Storm Calvin formed on June 11, and Hurricane Dora on June 25. For the third year in a row, July featured above average activity, with the fifth highest ACE value for that month on record. [ citation needed ]
|Tropical storm (SSHWS)|
|Duration||May 9 – May 10|
|Peak intensity||45 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. A broad cyclonic circulation began to develop as expected late on May 7, gradually organizing into the season's first tropical depression by 21:00 UTC on May 9. 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 at the time, before being overtaken by Tropical Depression One-E in 2020. The previous record was held by 1990's Hurricane Alma, which formed on May 12. 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. 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. Adrian's remnant low persisted for another day, before dissipating on May 12.
Additionally, unrelated to Adrian, Tropical Storm Arlene in the North Atlantic basin also formed before the corresponding hurricane season was set to officially begin, being the most intense storm in the month of April in the North Atlantic since Ana in 2003. This makes the second consecutive year after 2016 where the first storms in both basins were pre-season storms.
|Tropical storm (SSHWS)|
|Duration||May 31 – June 2|
|Peak intensity||45 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.
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. 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. As of June 4, a total of seven people have been killed—five in Oaxaca and two in Tehuantepec. Damage in Oaxaca reached MXN$3.2 billion (US$172 million).
|Tropical storm (SSHWS)|
|Duration||June 11 – June 13|
|Peak intensity||45 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. 9, 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. It was slow to organize initially due to moderate easterly wind shear as it drifted northwestwards; by 18:00 UTC on June 12, however, the tropical depression intensified into Tropical Storm Calvin. Intensifying slightly to reach winds of 45 mph (75 km/h), Calvin made landfall halfway between Salina Cruz and Puerto Ángel, near Paja Blanca, around 00:00 UTC on June 13. Just 12 hours later, Calvin dissipated into a remnant low. The remnants of the storm caused heavy rainfall and some flooding in the area, however no fatalities were reported. 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.This prediction came to fruition on June
|Category 2 hurricane (SSHWS)|
|Duration||June 24 – June 28|
|Peak intensity||105 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.
With impressive outflow and an eye apparent on satellite imagery, 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. The outer bands of Dora brought heavy rains to Guerrero, resulting in flash floods that inundated 20 homes. Overall damage was minor, however.the storm peaked with maximum sustained winds of 105
|Category 3 hurricane (SSHWS)|
|Duration||July 7 – July 12|
|Peak intensity||115 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. 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. However, by 12 hours later, the entrainment of dry air caused Eugene to weaken to a Category 2 hurricane, and due to traveling over cooler waters, Eugene weakened to a tropical storm on the following day. 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.
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.
|Category 4 hurricane (SSHWS)|
|Duration||July 12 – July 22|
|Peak intensity||145 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, the disturbance rapidly organized into a tropical depression by 03:00 UTC on July 12, and further strengthened to become Tropical Storm Fernanda around 15:00 UTC that day. The nascent cyclone initially battled moderate northeasterly wind shear, with its low-level circulation displaced to the northeastern edge of the deep convection. 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. A well-defined eye formed within a growing central dense overcast, and Fernanda further intensified into a major hurricane early on July 14. Only six hours later, the system was upgraded to a Category 4 hurricane. 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.
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. 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. The eyewall replacement cycle concluded early on July 16, allowing Fernanda to remain a powerful hurricane amid favorable environmental conditions. By late on July 18, however, cooler ocean temperatures and a more stable environment prompted the storm's weakening trend. Fernanda fell below hurricane intensity shortly before entering the Central Pacific as it succumbed to stronger southwesterly wind shear, becoming a tropical depression at 03:00 UTC on July 21, 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.
|Tropical depression (SSHWS)|
|Duration||July 17 – July 20|
|Peak intensity||35 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. Despite only marginally conducive environmental conditions, the disturbance began to show signs of organization two days later, and it attained tropical depression status by 06:00 UTC on July 17. 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). 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.
|Tropical storm (SSHWS)|
|Duration||July 17 – July 26|
|Peak intensity||60 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. The disturbance formed two days later and slowly organized into a tropical depression by 15:00 UTC on July 17. 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. Ultimately, given global models' poor handling of the environment, NHC lowered their intensity forecast for Greg. 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. 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. It degenerated to a remnant low 24 hours later.
|Category 2 hurricane (SSHWS)|
|Duration||July 21 – July 30|
|Peak intensity||110 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. A large area of disturbed weather progressed westward across Costa Rica later that day, steadily organizing into a tropical depression by 15:00 UTC on July 21. The cyclone failed to organize immediately after formation, and its low-level center migrated to the southern extent of associated convection. 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. Over the coming hours, the cyclone's convective structure evolved into a small central dense overcast while hints of an eye became apparent; in accordance with satellite estimates, Hilary was upgraded to a hurricane at 09:00 UTC on July 24. 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. After maintaining its intensity, the hurricane began to weaken late on July 26 as northerly wind shear increased. It fell back to tropical storm intensity around 03:00 UTC on July 27, and ultimately degenerated to a remnant low four days later.
|Category 1 hurricane (SSHWS)|
|Duration||July 22 – August 1|
|Peak intensity||90 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. A tropical wave began producing disorganized cloudiness three days later, and the broad system slowly organized into a tropical depression by 15:00 UTC on July 22. 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. Over the next 24 hours, deep convection began to wrap around the center and a mid-level eye formed as environmental conditions improved; by 09:00 UTC on July 25, Irwin intensified into a hurricane. 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. Almost immediately, outflow from nearby Hurricane Hilary increased wind shear over the system and caused it to begin weakening; Irwin rapidly fell to tropical storm strength around 15:00 UTC on July 26. 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. 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.
|Tropical depression (SSHWS)|
|Duration||August 4 – August 5|
|Peak intensity||35 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. An area of disorganized showers and thunderstorms associated with a tropical wave materialized three days later, but little change occurred thereafter. Early on August 3, a surface circulation formed in association with concentrating convection, and this process led to the formation of a tropical depression by 06:00 UTC the next day. 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. Falling short of the tropical storm criteria, the short-lived depression was declared a remnant low at 18:00 UTC that day. 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.
|Tropical storm (SSHWS)|
|Duration||August 11 – August 13|
|Peak intensity||40 mph (65 km/h) (1-min) 1003 mbar (hPa)|
The NHC began monitoring a strong tropical wave over the eastern Caribbean on August 3. The feature pushed westward, developing into Hurricane Franklin before making landfall on the Yucatán, and attaining its peak as a Category 1 hurricane before making landfall near Vega de Alatorre, Veracruz on August 10. 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. 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. 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. After lacking sufficient organization to be declared a tropical cyclone, the storm was declared a remnant low around 03:00 UTC on August 14.
|Category 4 hurricane (SSHWS)|
|Duration||August 18 – August 23|
|Peak intensity||130 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. A large area of disturbed weather developed two days later as predicted; however, organization was slow to occur, and a tropical depression only formed four days later, around 15:00 UTC on August 18. 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. Despite forecasts of only slight additional intensification, 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, and six hours later reached its peak as a Category 4 hurricane with sustained winds of 130 mph (215 km/h). 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. By 21:00 UTC on August 22, the storm weakened below hurricane strength. On the following day, at 21:00 UTC, Kenneth was declared to be post-tropical.
|Tropical storm (SSHWS)|
|Duration||August 30 – September 3|
|Peak intensity||65 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.
|Category 3 hurricane (SSHWS)|
|Duration||September 11 – September 19|
|Peak intensity||115 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. 12 mi (19 km). 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). Twelve hours after developing a well-defined eye, Otis started weakening at a remarkable rate, losing most of its deep convection due to low ocean surface temperatures, until it weakened into a remnant low on September 19.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. 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. 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. 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
|Category 1 hurricane (SSHWS)|
|Duration||September 13 – September 15|
|Peak intensity||90 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. A trough of low pressure materialized the next day, 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, the newly formed cyclone intensified into Tropical Storm Max six hours later. 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. Max attained peak winds of 90 mph (150 km/h), 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.
In preparation for Max, about 788 people evacuated to temporary shelters. ft (3–5 m) battered the coastline, where six ships were sunk. Damage from the hurricane was estimated to be around US$13 million.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. Waves of 10–16
|Category 1 hurricane (SSHWS)|
|Duration||September 14 – September 20|
|Peak intensity||75 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. UTC on September 14 the system was noted to develop a well-defined center and spiral banding. This led to the formation of Tropical Storm Norma, operationally skipping tropical depression status. 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. 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). 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. However, its broad circulation and the entrainment of dry air quickly became an impediment in doing so. 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. 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. 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. The remnants of Norma persisted for a little over 2 days before they completely dissipated.The disturbance gradually organized during the following days and by 09:00
|Tropical storm (SSHWS)|
|Duration||September 23 – September 25|
|Peak intensity||50 mph (85 km/h) (1-min) 1000 mbar (hPa)|
During the week of September 18, the NHC began monitoring a tropical wave, UTC when the system was noted to developed surface winds of over 35 mph (55 km/h) becoming Tropical Depression Eighteen-E. 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. 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). 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. However, early on September 25, these warnings were discontinued, 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. 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.as it spawned a broad area of low pressure located offshore of the southwestern coast of Mexico. The disturbance lacked any significant organization until September 23 at around 21:00
|Tropical storm (SSHWS)|
|Duration||October 3 – October 4|
|Peak intensity||45 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. UTC the following day. The National Hurricane Center issued its last advisory on the degenerated system at 09:00 UTC, on October 5.The system increased in intensity and became Tropical Storm Ramon later on the same day, skipping tropical depression status. Due to wind shear from a large anticyclone to its north, the storm did not intensify much further. Although Ramon was forecast to linger over open waters as it moved westward, this did not occur and the system quickly grew disorganized. Ramon weakened into a tropical depression on October 4, having lasted as a tropical storm only for 18 hours. As it moved westward, Ramon continued to weaken, until it finally degenerated into a trough of low pressure by 00:00
|Tropical storm (SSHWS)|
|Duration||October 27 – October 28|
|Peak intensity||40 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. The system quickly gained organization as it moved northwestwards, and was declared Tropical Storm Selma at 09:00 UTC on October 27. 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. 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, this did not materialize, and Selma never strengthened beyond minimal tropical storm status. Eventually, at 12:00 UTC on October 28, Selma made landfall just southeast of San Salvador, El Salvador, becoming the first Eastern Pacific tropical cyclone to make landfall anywhere in El Salvador. 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.
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. Rainfall extended into Nicaragua, causing floods that claimed another 10 lives in areas recovering from Tropical Storm Nate.
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.This same list was used in the 2011 season.
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.The next four names that were slated for use in 2017 are shown below; however, none of them were used.
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.
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.
|Dates active||Storm category |
at peak intensity
|Adrian||May 9 – 10||Tropical storm||45 (75)||1004||None||None||None|
|Beatriz||May 31 – June 2||Tropical storm||45 (75)||1001||Southwestern Mexico||$172 million||7|
|Calvin||June 11 – 13||Tropical storm||45 (75)||1004||Southwestern Mexico, Guatemala||$3.88 million||None|
|Dora||June 25 – 28||Category 2 hurricane||105 (165)||974||Southwestern Mexico||Minimal||None|
|Eugene||July 7 – 12||Category 3 hurricane||115 (185)||966||Baja California Peninsula, California||None||None|
|Fernanda||July 12 – 22||Category 4 hurricane||145 (230)||948||Hawaii||None||None|
|Eight-E||July 17 – 20||Tropical depression||35 (55)||1007||None||None||None|
|Greg||July 17 – 26||Tropical storm||60 (95)||1000||None||None||None|
|Hilary||July 21 – 30||Category 2 hurricane||110 (175)||969||Southwestern Mexico||None||None|
|Irwin||July 22 – August 1||Category 1 hurricane||90 (150)||979||None||None||None|
|Eleven-E||August 4 – 5||Tropical depression||35 (55)||1006||None||None||None|
|Jova||August 11 – 13||Tropical storm||40 (65)||1003||Western Mexico||None||None|
|Kenneth||August 18 – 23||Category 4 hurricane||130 (215)||951||None||None||None|
|Lidia||August 31 – September 3||Tropical storm||65 (100)||986||Western Mexico, Baja California Peninsula, Arizona, California||$123 million||18 (2)|
|Otis||September 11 – 19||Category 3 hurricane||115 (185)||965||None||None||None|
|Max||September 13 – 15||Category 1 hurricane||90 (150)||980||Southern Mexico||$76.4 million||1|
|Norma||September 14 – 20||Category 1 hurricane||75 (120)||985||Baja California Peninsula||None||None|
|Pilar||September 23 – 25||Tropical storm||50 (85)||1000||Western Mexico||Minimal||None|
|Ramon||October 3 – 4||Tropical storm||45 (75)||1002||Southern Mexico||None||None|
|Selma||October 27 – 28||Tropical storm||40 (65)||1004||Nicaragua, Costa Rica, El Salvador, Guatemala, Honduras||Unknown||17|
|20 systems||May 9 – |
|145 (230)||948||$375 million||43 (2)|
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 season 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.
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.
The 2011 Pacific hurricane season was below-average in terms of named storms but also had an above average number of six major hurricanes. 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. Only one of the named storms was not a hurricane.
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.
Hurricane Bertha was the longest-lived Atlantic tropical cyclone on record during July, and it also attained tropical storm intensity farther east than any other system on record during the month. The second named storm, first hurricane, and first major hurricane of the active 2008 season, Bertha developed into a tropical depression on July 3 from a tropical wave that departed western Africa two days prior. On a west-northwest to northwest track, the depression intensified into Tropical Storm Bertha six hours formation and ultimately attained hurricane intensity on July 7. A period of rapid deepening brought the cyclone to its peak as a Category 3 hurricane with winds of 125 mph (205 km/h) late that afternoon. Changes in wind shear and the storm's internal structure allowed Bertha to fluctuate in intensity over the next week as it passed very near Bermuda, but a track over cooler waters eventually caused the system to become an extratropical cyclone by July 20. It continued northeast and was absorbed by another low near Iceland the following day. Rough surf propelled by Bertha killed three people along the East Coast of the United States; hundreds of other swimmers were injured and/or required rescuing. In Bermuda, some streets were flooded and strong gusts cut power to approximately 7,500 homes; only minor damage was observed.
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.
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 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.
The 2017 Atlantic hurricane season was the costliest tropical cyclone season on record, with a damage total of at least $294.92 billion (USD). It was also a hyperactive Atlantic hurricane season, featuring 17 named storms, 10 hurricanes, and 6 major hurricanes, 2017 was the fifth-most active Atlantic hurricane season on record, tied with 1936. Most of the season's damage was due to hurricanes Harvey, Irma, and Maria. Another notable hurricane, Nate, was the worst natural disaster in Costa Rican history. The names Harvey, Irma, Maria, and Nate were retired following the season due to the number of deaths and amount of damage they caused. Collectively, the tropical cyclones were responsible for at least 3,364 deaths—the most fatalities in a single season since 2005. The season also had the highest accumulated cyclone energy (ACE) since 2005, with a record three hurricanes each generating an ACE of over 40: Irma, Jose, and Maria.
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, 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.
Hurricane Marty was a tropical cyclone that produced heavy rains and flooding in several states in Southwestern and Western Mexico. The twentieth named storm and twelfth hurricane of the annual hurricane season, Marty developed from a tropical wave on September 26, 2015 to the southwest of Acapulco, Guerrero, in Mexico. Initially a tropical depression, the system strengthened into a tropical storm early on the following day. Due to favorable atmospheric conditions, Marty continued to intensify, but wind shear sharply increased as the storm approached a large mid- to upper-level trough. Despite this, the cyclone deepened further, becoming a hurricane on September 28 and peaking with sustained winds of 80 mph (130 km/h) shortly thereafter. Wind shear quickly took its toll on the hurricane, weakening it to a tropical storm early on September 29. About 24 hours later, Marty degenerated into a post-tropical low pressure area offshore Guerrero. The low further degenerated into a trough later on September 30, and eventually dissipated on October 4.
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.
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.
Hurricane Harvey was the costliest tropical cyclone on record, inflicting roughly $125 billion in damage across the Houston metropolitan area and Southeast Texas. 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 monitored 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.
Hurricane Irma was an extremely powerful Cape Verde hurricane that caused extensive damage in the Caribbean and Florida. Lasting from late August to mid-September 2017, the storm was the strongest open-Atlantic tropical cyclone on record and the first Category 5 hurricane to strike the Leeward Islands. Classified as the ninth named storm, fourth hurricane, and second major hurricane of the hyperactive 2017 Atlantic hurricane season, Irma developed from a tropical wave near the Cape Verde Islands on August 30. Favorable conditions allowed the cyclone to become a hurricane on the following day and then rapidly intensify into a major hurricane by September 1 as it moved generally westward across the Atlantic. However, dry air and eyewall replacement cycles disrupted further strengthening, with fluctuations in intensity during the next few days. Irma resumed deepening upon encountering warmer sea surface temperatures, while approaching the Lesser Antilles on September 4. The system reached Category 5 intensity on the following day and peaked with winds of 180 mph (285 km/h) shortly thereafter.
The 2018 Pacific hurricane season produced the highest accumulated cyclone energy value on record in the basin. With 23 named storms, it was the fourth-most active season on record, tied with 1982. The season also featured seven landfalls, six of which occurred in Mexico. 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. However, tropical cyclone formation is possible at any time of the year, as illustrated when the first tropical depression formed on May 10, five days prior to the official start of the season.
The 2019 Pacific hurricane season was a near average season which produced nineteen named storms, though most were rather weak and short-lived. Only seven hurricanes formed, the fewest since 2010. The season officially began on May 15 in the East Pacific Ocean, and on June 1 in the Central Pacific; they ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin. However, the formation of tropical cyclones is possible at any time of the year.
Hurricane Bud was the first of six tropical cyclones to make a landfall in Mexico during the 2018 Pacific hurricane season. Bud was a powerful tropical cyclone that produced heavy rainfall and flash flooding across Northwestern Mexico and the Southwestern United States. However, the storm resulted in only minor damage. The second named storm, hurricane, and major hurricane of the season, Bud originated from a tropical wave that departed from Africa on May 29. It then traveled 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 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.
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