|2014 Pacific hurricane season|
Season summary map
|First system formed||May 22, 2014|
|Last system dissipated||November 5, 2014|
|• Maximum winds||160 mph (260 km/h)|
|• Lowest pressure||918 mbar (hPa; 27.11 inHg)|
|Hurricanes||16 (record high, tied with 1990, 1992 and 2015)|
|Total fatalities||49 total|
|Total damage||≥ $1.52 billion (2014 USD)|
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 1949 Pacific hurricane season was the first hurricane season in the Eastern Pacific hurricane database. Six tropical cyclones were known to have existed during the season, of which the first formed on June 11 and the final dissipated on September 30. Another tropical cyclone had formed within the basin in 1949, but was included in the Atlantic hurricane database, had it been classified operationally in the Eastern Pacific basin, would have tallied the overall season to seven tropical cyclones. In addition, there were two tropical cyclones that attained hurricane status, but none of them reached major hurricane intensity. Tropical Storm Three threatened the Baja California Peninsula, while an unnumbered hurricane crossed into the Atlantic, later becoming the 1949 Texas hurricane.
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.
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.
Entering the season, expectations were high, with most weather agencies predicting a near or above average season. The season began with an active start, with three tropical cyclones developing before June 15, including two Category 4 hurricanes, of which one became the strongest tropical cyclone ever recorded in May in the East Pacific. After a less active period in late June and early July, activity once again picked up in late July. Activity increased in August, which featured four major hurricanes, and persisted throughout September and October. However, activity finally waned by early November. Overall, the 22 tropical storms marked the highest total in 22 years. In addition, a record-tying 16 hurricanes developed. Furthermore, there were total of nine major hurricanes, Category 3 or greater on the Saffir-Simpson Hurricane Wind Scale, including a then-record-tying eight in Eastern Pacific proper (east of 140°W).
The active season resulted in numerous records and highlights. First, Hurricane Amanda was the strongest May hurricane and earliest Category 4 on record. A month later, Hurricane Cristina became the earliest second major hurricane, although it was surpassed by Hurricane Blanca the following year. In August, Hurricane Iselle became the strongest tropical cyclone on record to strike the Big Island of Hawaii while Hurricane Marie was the first Category 5 hurricane since 2010. The following month, Hurricane Odile became the most destructive tropical cyclone of the season and the most intense and destructive tropical cyclone to make landfall over the Baja California peninsula.
Hurricane Amanda was the strongest Eastern Pacific tropical cyclone ever recorded in the month of May. The first named storm, hurricane and major hurricane of the 2014 Pacific hurricane season, Amanda originated from a tropical wave that had entered the Eastern Pacific on May 16. Slow development occurred as it tracked westward, and development into a tropical depression occurred on May 22. The depression later strengthened into a tropical storm on May 23. Amid very favorable conditions, Amanda then rapidly intensified late on May 23, eventually reaching its peak intensity on May 25 as a high-end Category 4 hurricane. Afterwards, steady weakening occurred due to upwelling beneath the storm, and Amanda fell below major hurricane intensity on May 26. Rapid weakening occurred and the cyclone eventually dissipated on May 29.
Hurricane Blanca was the earliest recorded tropical cyclone to make landfall in Baja California in any given year. Forming as a tropical depression on May 31, Blanca initially struggled to organize due to strong wind shear. However, once this abated, the system took advantage of high sea surface temperatures and ample moisture. After becoming a tropical storm on June 1, Blanca rapidly intensified on June 2–3, becoming a powerful Category 4 hurricane on the Saffir–Simpson hurricane wind scale; maximum sustained winds reached 145 mph (230 km/h) at this time. The hurricane's slow motion resulted in tremendous upwelling of cooler water, resulting in a period of weakening. Blanca gradually recovered from this and briefly regained Category 4 status on June 6 as it moved generally northwest toward the Baja California peninsula. Cooler waters and increased shear again prompted weakening on June 7 and the system struck Baja California Sur on June 8 as a weak tropical storm. It quickly degraded to a depression and dissipated early the next day.
Hawaiʻi is the largest island located in the U.S. state of Hawaii. It is the largest and the southeasternmost of the Hawaiian Islands, a chain of volcanic islands in the North Pacific Ocean. With an area of 4,028 square miles (10,430 km2), it has 63% of the Hawaiian archipelago's combined landmass, and is the largest island in the United States. However, it has only 13% of Hawaiʻi's people. The island of Hawaiʻi is the third largest island in Polynesia, behind the two main islands of New Zealand.
|Record high activity:||1992: 27||2015: 16||2015: 11|
|Record low activity:||2010: 8||2010: 3||2003: 0|
|March 12, 2014||SMN||15||7||3|
|April 10, 2014||SMN||14||7||5|
|May 22, 2014||CPC||14–20||7–11||3–6|
|July 31, 2014||SMN||17||8||5|
On March 12, 2014, the Servicio Meteorológico Nacional (SMN) issued its first outlook for the Pacific hurricane season, expecting a total of fifteen named storms, seven hurricanes, and three major hurricanes . A month later, the agency revised their outlook to fourteen named storms, seven hurricanes, and five major hurricanes, citing the anticipated development of El Niño for above-average activity, compared to the 1949–2013 average of 13.2, On May 22, the Climate Prediction Center (CPC) announced its prediction of 14 to 20 named storms, seven to eleven hurricanes, three to six major hurricanes, and an Accumulated Cyclone Energy (ACE) within 95–160% of the median. It also called for a 50% chance of an above-normal season, a 40% chance of a near-normal season, and a 10% chance of a below-normal season. Similar to the SMN outlook, the basis for the forecast was the expectation of below average wind shear and above average sea surface temperatures, both factors associated with El Niño conditions. The CPC also noted that the Eastern Pacific was in a lull that first began in 1995; however, they expected that this would be offset by the aforementioned favorable conditions. Within the Central Pacific Hurricane Center (CPHC)'s jurisdiction, four to seven tropical cyclones were expected to form, slightly above the average of four to five tropical cyclones. On July 31, the SMN released their final forecast, raising the numbers to 17 named storms, 8 hurricanes and 5 major hurricanes.
El Niño is the warm phase of the El Niño–Southern Oscillation (ENSO) and is associated with a band of warm ocean water that develops in the central and east-central equatorial Pacific, including the area off the Pacific coast of South America. The ENSO is the cycle of warm and cold sea surface temperature (SST) of the tropical central and eastern Pacific Ocean. El Niño is accompanied by high air pressure in the western Pacific and low air pressure in the eastern Pacific. El Niño phases are known to occur close to four years, however, records demonstrate that the cycles have lasted between two and seven years. During the development of El Niño, rainfall develops between September–November. The cool phase of ENSO is La Niña, with SSTs in the eastern Pacific below average, and air pressure high in the eastern Pacific and low in the western Pacific. The ENSO cycle, including both El Niño and La Niña, causes global changes in temperature and rainfall.
The Climate Prediction Center (CPC) is a United States federal agency that is one of the National Centers for Environmental Prediction, which are a part of the National Oceanic and Atmospheric Administration's National Weather Service. CPC is headquartered in College Park, Maryland. Its roots trace back to the late 18th century, with the United States Army Signal Corp taking over responsibility of the climate program in the late 19th century. Once it became part of the United States Weather Bureau, it was known as the Weather Bureau Climate and Crop Services. From 1957 through 1966, the United States Weather Bureau's Office of Climatology, located in Washington, D.C. and then Suitland, Maryland, published the Mariners Weather Log publication. Late in the 20th century, it was known as the Climate Analysis Center for a time, before evolving into CPC in 1995. CPC issues climate forecasts valid for weeks and months in advance.
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.
The well-above average activity in 2014 was reflected by an Accumulated Cyclone Energy (ACE) index of 160.3 units for the East Pacific and 38.49 units for the Central Pacific, giving a total of 198.79 units. The total ACE for the East Pacific was 43% above the 1981–2010 average and ranked as the seventh-highest since 1971.
Accumulated cyclone energy (ACE) is a measure used by various agencies including the National Oceanic and Atmospheric Administration (NOAA) and the India Meteorological Department to express the activity of individual tropical cyclones and entire tropical cyclone seasons. It uses an approximation of the wind energy used by a tropical system over its lifetime and is calculated every six hours. The ACE of a season is the sum of the ACEs for each storm and takes into account the number, strength, and duration of all the tropical storms in the season. The highest ACE calculated for a single storm is 82, for Hurricane/Typhoon Ioke in 2006.
The season's first named storm, Amanda, developed on May 23, shortly after the official start to the Pacific hurricane season on May 15. On May 24, the system intensified into a hurricane, transcending the climatological average date of June 26 for the first hurricane. The next day, Amanda attained major hurricane status, over a month sooner than the average date of July 19. Owing to Amanda's extreme intensity the ACE value for May was the highest on record in the East Pacific at 18.6 units, eclipsing the previous record of 17.9 units set in 2001. Hurricane Cristina became the second's major hurricane, the system broke the previous record set by Hurricane Darby in 2010 which reached major status on June 25. However, this record was broken by Hurricane Blanca in 2015 which reached major status on June 3. Through June 14, the seasonal ACE reached its highest level since 1971, when reliable records began, for so early in the season. By the end of June, the ACE total remained at 230% of the normal value, before subsiding to near-average levels to end July. By late July, the basin became re-rejuvenated, with 3 systems forming during the final 10 days of the month. Activity in August ramped up significantly, with four hurricanes developing during the month, two of which became major hurricanes, excluding Iselle and Genevieve, which formed in July, but became a major hurricane during August. By the end of August, ACE values rose to 60% above the 30-year average.
The 2001 Pacific hurricane season was a near average season. The most notable storm that year was Hurricane Juliette, which caused devastating floods in Baja, California, leading to 12 fatalities and $400 million worth of damage. Two other storms were notable in their own rights, Hurricane Adolph became the strongest May Hurricane until 2014 when both records set by Adolph and Juliette were broken by Hurricanes Amanda and Odile. Tropical Storm Barbara passed just north of Hawaii, bringing minimal impact. The season officially began on May 15, 2001 in the eastern Pacific, and on June 1, 2001 in the central Pacific, and lasted until November 30, 2001. These dates conventionally delimit the period of each year when most tropical cyclones form in this part of the Pacific Ocean. The first storm developed on May 25, while the last storm dissipated on November 3.
Continued, though less prolific, activity extended through September with four hurricanes developing that month. ACE values remained 45% above-average by the end of the month. 3 hurricane during the afternoon of October 4, the 2014 season featured the highest number of major hurricanes in the Eastern Pacific basin since the advent of satellite imagery. With eight such storms east of 140°W, the year tied with the record set in the 1992 season. However, this record was surpassed by the 2015 Pacific hurricane season.Following the rapid intensification of Hurricane Simon to a Category
|Category 4 hurricane (SSHWS)|
|Duration||May 22 – May 29|
|Peak intensity||155 mph (250 km/h) (1-min) 932 mbar (hPa)|
Amanda originated as a tropical wave that moved into the eastern Pacific on May 16. It continued west, organizing into a tropical depression around 18:00 UTC on May 22 and further intensifying into a tropical storm a day later. After attaining hurricane strength at 12:00 UTC on May 24, the storm began a period of rapid intensification, peaking as high-end Category 4 hurricane with winds of 155 mph (250 km/h) within 24 hours; this made Amanda the strongest May tropical cyclone and second earliest major hurricane on record in the basin. As the system slowed to a crawl, cold water upwelling beneath it began a weakening trend. The hurricane fell to tropical storm strength early on May 28, weakened to tropical depression strength early on May 29, and dissipated around 18:00 UTC that day.
A river near Coyuca de Benítez overflowed its banks. Three trees were brought down and a vehicle in Acapulco was destroyed,near where one person was killed. In Colima, minor landslides occurred, resulting in the closure of Federal Highway 200. Two people perished in Michoacán while several roads were destroyed in Zitácuaro.
|Tropical storm (SSHWS)|
|Duration||June 2 – June 4|
|Peak intensity||45 mph (75 km/h) (1-min) 998 mbar (hPa)|
The formation of Boris is attributed to a low-level trough that entered the East Pacific from the southwestern Caribbean Sea on May 28. A broad area of low pressure developed in association with the trough south of the Mexico–Guatemala border two days later, and the disturbance steadily organized with aid from an eastward-moving convectively-coupled kelvin wave. By 18:00 UTC on June 2, the system acquired enough organization to be deemed a tropical depression. Tracking northward, the depression steadily became better defined as spiral bands developed over the eastern semicircle of the circulation. After intensifying into a tropical storm at 12:00 UTC on June 3 and attaining peak winds of 45 mph (75 km/h) six hours later, increasing land interaction caused Boris to begin weakening. It was downgraded to a tropical storm early on June 4 and subsequently degenerated into a remnant low at 18:00 UTC. The remnant low turned northwestward and dissipated shortly thereafter.
Posing a considerable rainfall and mudslide threat to Guatemala, classes were suspended in nine school districts, impacting 1.25 million pupils. Similarly, some classes were suspended in the Mexican states of Chiapas and Oaxaca. In the former, roughly 16,000 people were evacuated out of hazardous areas. Most of the impacts associated with Boris were due to its developing precursor, whose heavy rainfalls caused 20 mudslides, killing five and resulting in extensive property damage. Heavy rainfall in Chiapas caused rivers to overflow their banks, resulting in minor damage. Overall, the effects of Tropical Storm Boris and its precursor killed six people across Central America.
|Category 4 hurricane (SSHWS)|
|Duration||June 9 – June 15|
|Peak intensity||150 mph (240 km/h) (1-min) 935 mbar (hPa)|
The complex interaction of a tropical wave, disturbance within the Intertropical Convergence Zone, and convectively-coupled kelvin wave led to the formation of a tropical depression around 12:00 UTC on June 9. Northerly shear limited intensification of the cyclone initially, but it became Tropical Storm Cristina eighteen hours after formation. A relaxation in upper-level winds allowed the system to begin a period of rapid intensification on June 11, and Cristina became both the earliest second hurricane and major hurricane on record at the time before attaining its peak as a Category 4 with winds of 150 mph (240 km/h) around 12:00 UTC on June 12. The combination of an eyewall replacement cycle, cooler waters, and entrainment of dry air caused Cristina to begin weakening shortly after peak; it fell to tropical storm intensity early on June 14 and degenerated to a remnant low by 06:00 UTC the next morning. The low moved erratically within low-level flow and dissipated early on June 19.
Under the anticipation of 12 ft (3.7 m) waves, a "yellow" alert was issued for Colima, Guerrero, Oaxaca, and parts of Jalisco and Michoacan. Along Manzanillo, strong waves resulted in minor flooding that damaged one road.
|Tropical storm (SSHWS)|
|Duration||June 28 – July 5|
|Peak intensity||50 mph (85 km/h) (1-min) 999 mbar (hPa)|
A tropical wave emerged off the western coast of Africa on June 17, tracking across the Atlantic Ocean with inappreciable organization throughout the following days. The wave crossed Central America on June 25, where deep convective activity increased. On June 28, the disturbance became distinctively better defined with a well-defined center and spiral banding, signifying the formation of a tropical depression by 18:00 UTC while positioned about 345 mi (555 km) south-southwest of Manzanillo, Mexico. Steered west-northwest and eventually northwest under the influence of a mid-level ridge, the broad cyclone slowly intensified into a tropical storm by 00:00 UTC on June 30, attaining peak winds of 50 mph (85 km/h) late the next day. Thereafter, a track over cooler waters and into a drier environment caused the system to begin weakening; at 06:00 UTC on July 5, Douglas degenerated into a non-convective remnant low well west of Baja California. The remnant low turned slowly west-northwest prior to dissipating on July 8.
|Tropical storm (SSHWS)|
|Duration||June 30 – July 2|
|Peak intensity||50 mph (85 km/h) (1-min) 1002 mbar (hPa)|
A well-defined tropical wave moved emerged off the western coast Africa on June 20. After entering the East Pacific a week later, shower and thunderstorm activity began to increase. Although the system lacked a closed low initially, a small circulation was noted by 06:00 UTC on June 30, and the system was declared Tropical Storm Elida accordingly. Paralleling the southwestern coast of Mexico, the cyclone attained peak winds of 45 mph (75 km/h) before strong northwesterly wind shear from nearby Tropical Storm Douglas caused the storm to become disheveled. It weakened to a tropical depression at 00:00 UTC on July 2 and degenerated into a remnant low six hours later. The remnant low drifted southeastward before dissipating early on July 3.
|Tropical storm (SSHWS)|
|Duration||July 7 – July 9|
|Peak intensity||45 mph (75 km/h) (1-min) 1004 mbar (hPa)|
A tropical wave moved off the western coast of Africa on June 22 and entered the East Pacific eight days later. On July 4, convection increased with the aid of a convectively-coupled kelvin wave, and two days later, a broad area of low pressure formed along the wave axis well south-southwest of Baja California. After further organization, the disturbance was declared a tropical depression at 12:00 UTC on July 7. Steered westward around a subtropical ridge, the depression intensified into Tropical Storm Fausto six hours later and simultaneously attained peak winds of 45 mph (75 km/h). By early on July 9, Fausto weakened to a tropical depression as dry air became entrained into the circulation. The low-level center opened up into a trough by 12:00 UTC, marking the demise of the cyclone.
|Tropical storm (SSHWS)|
|Duration||July 17 – July 18|
|Peak intensity||45 mph (75 km/h) (1-min) 1003 mbar (hPa)|
The NHC began monitoring a large area of disturbed weather in association with a tropical wave well southwest of the southern tip of the Baja California peninsula on July 13. After crossing into the central Pacific, the disturbance gradually organized, and it acquired enough organization to be declared a tropical depression at 00:00 UTC on July 17. An hour later, data from an ASCAT pass revealed winds up to 45 mph (75 km/h), and the depression was upgraded to Tropical Storm Wali. Steered west-northwestward around a mid-level ridge to the cyclone's northeast, increasing wind shear caused the cloud pattern associated with Wali to become disorganized; at 18:00 UTC on July 18, the system was downgraded to a tropical depression, and by 00:00 UTC the following afternoon, Wali was declared a remnant low after having been devoid of deep convection.
|Category 3 hurricane (SSHWS)|
|Duration||July 25 – August 7 (Exited basin)|
|Peak intensity||115 mph (185 km/h) (1-min) 965 mbar (hPa)|
A disturbance first identified south of Panama on July 15 continued west and organized into a tropical depression around 00:00 UTC on July 25; it intensified into Tropical Storm Genevieve six hours later. Increasing wind shear caused the cyclone to degenerate to a remnant low early on July 28 after it entered the central Pacific, and although it regenerated and subsequently intensified into a tropical storm again two days later, an unfavorable environment caused it to lose its status as a tropical cyclone for a second time around 00:00 UTC on August 1. Genevieve once again regenerated to a tropical depression around 06:00 UTC on August 2, and it continued west across the central Pacific as a low-end system for several days. An intensification trend began in earnest on August 5, and Genevieve attained hurricane strength around 12:00 UTC the next morning before beginning a period of rapid intensification. It attained major hurricane intensity before crossing the International Date Line into the western Pacific early on August 7, where the system further intensified into a Category 5-equivalent typhoon.
|Category 1 hurricane (SSHWS)|
|Duration||July 26 – July 29|
|Peak intensity||75 mph (120 km/h) (1-min) 992 mbar (hPa)|
A tropical wave moved off the western coast of Africa on July 12 and reached the East Pacific by July 21. Initially devoid of convection, shower and thunderstorm activity increased significantly a few days later, possibly due to the passage of a convectively-coupled kelvin wave. Following the development of a closed area of low pressure, the disturbance was designated as a tropical depression at 06:00 UTC on July 26 while located about 405 mi (650 km) southwest of Zihuatanejo, Mexico; twelve hours later, it was upgraded to Tropical Storm Hernan. Influenced by a mid-level ridge over the southern United States and Mexico, the cyclone moved west-northwest to northwest while quickly strengthening. At 18:00 UTC on July 27, Hernan intensified into a Category 1 hurricane and simultaneously attained peak winds of 75 mph (120 km/h). Thereafter, increasing westerly shear and cooling ocean temperatures caused the storm to begin weakening. Hernan was downgraded to a tropical storm at 06:00 UTC on July 28 and degenerated into a remnant low at 12:00 UTC the following day. The remnant low slowed and turned west prior to dissipating early on July 31.
|Category 4 hurricane (SSHWS)|
|Duration||July 31 – August 9|
|Peak intensity||140 mph (220 km/h) (1-min) 947 mbar (hPa)|
A tropical wave emerged from Africa on July 14, eventually organizing into a tropical depression over the eastern Pacific around 12:00 UTC on July 31; six hours later, it strengthened into Tropical Storm Iselle. A mid-level ridge over Mexico directed the system west-northwest, while improving upper-level winds allowed Iselle to begin rapid intensification. Iselle reached hurricane intensity around 00:00 UTC on August 2 and major hurricane strength by 12:00 UTC the next day. As the hurricane moved parallel to the 26 °C isotherm, its cloud pattern evolved to resemble an annular hurricane, with a large eye and lack of convective bands. It intensified into a Category 4 hurricane early on August 4 and attained peak winds of 140 mph (220 km/h) around 18:00 UTC that day. Increased wind shear prompted a weakening trend as the system entered the central Pacific, and it weakened to a tropical storm by 06:00 UTC on August 8 before making landfall just east of Pahala, Hawaii, with winds of 60 mph (95 km/h) six hours later. The high terrain of Hawaii contributed to the disruption of Iselle's cloud pattern, and it degenerated to a remnant low by 06:00 UTC on August 9 before dissipating west of the island late the next day.
|Category 3 hurricane (SSHWS)|
|Duration||August 4 – August 15|
|Peak intensity||120 mph (195 km/h) (1-min) 960 mbar (hPa)|
Julio originated from a tropical wave that moved off Africa on July 20, ultimately organizing into a tropical depression well southwest of Baja California by 00:00 UTC on August 4. After intensifying into a tropical storm six hours later, it tracked west-northwest. Light northeasterly wind shear allowed the cyclone to reach hurricane strength around 06:00 UTC on August 6 and further organize to its peak as a Category 3 with winds of 120 mph (195 km/h) two days later, despite cool ocean temperatures. Shortly after entering the central Pacific, Julio began to weaken as a result of cold water upwelling. Although the cyclone fell to a tropical storm early on August 12, an upper-level environment still favorable for strengthening allowed Julio to briefly regain hurricane strength the next day. Julio fell below hurricane strength once again early on August 14 as southwesterly wind shear increased, weakened to a tropical depression early on August 15, and degenerated to a remnant low around 18:00 UTC that day. The low dissipated over the far northern Pacific on August 18.
|Category 1 hurricane (SSHWS)|
|Duration||August 13 – August 26|
|Peak intensity||85 mph (140 km/h) (1-min) 983 mbar (hPa)|
A tropical wave left Africa on July 28, crossing Central America to become a tropical depression by 00:00 UTC on August 12. The newly-formed system strengthened as it moved west-northwest, becoming Tropical Storm Karina around 12:00 UTC the next morning, and further intensifying to a hurricane by 18:00 UTC on August 14. Increasingly easterly shear eroded the hurricane's inner core, and Karina dramatically weakened as a result. By August 19, as it remained disorganized, a large ridge to its north diminished and a sprawling tropical cyclone—Lowell—formed to its east, leading to weak steering currents that allowed Karina to meander. It executed a three-day-long cyclonic loop, while environmental conditions began to improve, and became a hurricane again by 18:00 UTC on August 22; twelve hours later, Karina reached peak winds of 85 mph (140 km/h). Lower ocean temperatures and increasing shear soon deteriorated the storm's cloud pattern, and it fell below hurricane strength early on August 24. Lacking persistent convection, Karina degenerated to a remnant area of low pressure by 18:00 UTC on August 26, cementing its status as the seventh longest-lived tropical cyclone on record in the East Pacific. The remnant low moved around the southern portion of nearby Hurricane Marie and dissipated early on August 28.
|Category 1 hurricane (SSHWS)|
|Duration||August 17 – August 24|
|Peak intensity||75 mph (120 km/h) (1-min) 980 mbar (hPa)|
A tropical wave departed Africa on August 1, crossing Central America to become a tropical depression around 12:00 UTC on August 17. With a circulation about 920 mi (1,480 km) across, the unusually large system only slowly organized, becoming Tropical Storm Lowell around 18:00 UTC on August 18. Strong upper-level winds that had been plaguing the system weakened as it moved west then northwest, and its large circulation contracted, allowing Lowell to attain hurricane strength with peak winds of 75 mph (120 km/h) by 12:00 UTC on August 21 as a large eye became evident. Low wind shear allowed Lowell to only slowly decrease in intensity over the coming days despite cooling ocean temperatures. It became a tropical depression early on August 24 and degenerated to a remnant low around 12:00 UTC that morning. The post-tropical cyclone turned west and remained distinct until late on August 28, when it dissipated into an open trough well northeast of Hawaii.
|Category 5 hurricane (SSHWS)|
|Duration||August 22 – August 28|
|Peak intensity||160 mph (260 km/h) (1-min) 918 mbar (hPa)|
A tropical wave crossed the coast of Africa on August 10, developing into a tropical depression over the East Pacific around 00:00 UTC on August 22. Embedded in a very favorable environment, the system intensified into Tropical Storm Marie six hours later, part of a larger 66-hour period of rapid intensification that ultimately brought the storm to its peak as a Category 5 hurricane with winds of 160 mph (260 km/h) around 18:00 UTC on August 24. An eyewall replacement cycle later that day curbed the strengthening trend, and by August 26, a persistent ridge over the southern United States directed Marie into cooler ocean waters; both of these events caused steady to rapid weakening. Marie weakened to a tropical storm around 18:00 UTC on August 27 and degenerated to a remnant low a day later. The low turned west and eventually dissipated, early on September 2.
|Category 3 hurricane (SSHWS)|
|Duration||September 2 – September 7|
|Peak intensity||125 mph (205 km/h) (1-min) 950 mbar (hPa)|
A tropical wave departed Africa on August 18 and reached the East Pacific nearly two weeks later, where it steadily organized into Tropical Storm Norbert around 12:00 UTC on September 2. Departure from the ITCZ resulted in the system moving north initially, but a series of ridges over Mexico directed it on a west to northwest track for the remainder of its duration. Over anomalously warm ocean waters, and part of an increasingly favorable shear regime, Norbert intensified into a hurricane by 00:00 UTC on September 4. After levelling off in intensity the next day, the system quickly strengthened to its peak as a Category 3 hurricane with winds of 125 mph (205 km/h) around 06:00 UTC on September 6. Norbert passed west of Baja California and entered a drier environment, causing a rapid decay that caused it to degenerate to a remnant low by 00:00 UTC on September 7. The low meandered offshore before dissipating early on September 11.
|Category 4 hurricane (SSHWS)|
|Duration||September 10 – September 18|
|Peak intensity||140 mph (220 km/h) (1-min) 918 mbar (hPa)|
The most destructive hurricane of the 2014 season began as a tropical depression around 00:00 UTC on September 10 from a tropical wave that first left Africa on August 28. Situated between two mid-level ridges, the system moved northwest while steady intensifying, becoming Tropical Storm Odile six hours after formation and further strengthening into a hurricane by 06:00 UTC on September 13. A period of rapid intensification began at that time, with Odile's winds increasing from 75 mph (120 km/h) to a peak of 140 mph (220 km/h) within a 24-hour timeframe. The onset of an eyewall replacement cycle caused the hurricane to weaken slightly on September 14, but Odile still maintained winds of 125 mph (205 km/h) when it made landfall near Cabo San Lucas at 04:45 UTC. It continued up the spine of Baja California before curving northeast into the Gulf of California, ultimately making a second landfall near Alvaro Obregón, Mexico as a minimal tropical storm on September 17. Odile progressed inland and quickly dissipated over the mountainous terrain of Mexico by 06:00 UTC the next day.
|Tropical depression (SSHWS)|
|Duration||September 11 – September 15|
|Peak intensity||35 mph (55 km/h) (1-min) 1005 mbar (hPa)|
A tropical wave that cannot be traced back to Africa was first noted over the central Atlantic on August 29. It entered the East Pacific four days later, where an increase in organization led to the development of a tropical depression well southwest of Baja California around 06:00 UTC on September 11. A mid-level ridge to its east directed the newly-formed system northwest to north initially, but as this ridge gradually dissipated, nearby Hurricane Odile became the dominant steering mechanism and forced the depression generally east. In close proximity to Odile, the depression was heavily sheared and thus failed to intensify into a tropical storm. It instead degenerated to a remnant low around 06:00 UTC on September 15 before weakening to an open trough the next morning.
|Category 1 hurricane (SSHWS)|
|Duration||September 16 – September 22|
|Peak intensity||75 mph (120 km/h) (1-min) 979 mbar (hPa)|
The interaction of a westward-tracking tropical wave that emerged off the coast of Africa on September 4, an eastward-tracking kelvin wave, and an elongated surface trough led to the formation of Tropical Storm Polo by 00:00 UTC on September 16 about 310 mi (500 km) south of Puerto Escondido, Mexico. Tracking northwest within an environment conducive for strengthening, Polo intensified into a Category 1 hurricane and reached peak winds of 75 mph (120 km/h) by 00:00 UTC on September 18 as an eye became evident on satellite imagery. A sharp increase in wind shear quickly thereafter caused the storm's center to become exposed, and a reconnaissance mission indicated that Polo weakened to a tropical storm by 18:00 UTC that day. After maintaining intensity for about a day, the cyclone weakened to a tropical depression by 06:00 UTC on September 22 and further decreased into a remnant low six hours later. The low turned southwestward before dissipating well southwest of the southern tip of Baja California on September 26.
One tourist perished and three others, including two fisherman, went missing in Guerrero. A total of 190 restaurants and 20 shops were damaged.Damage in the state totalled at about 100 million pesos (US$7.6 million).
|Category 1 hurricane (SSHWS)|
|Duration||September 24 – September 30|
|Peak intensity||85 mph (140 km/h) (1-min) 980 mbar (hPa)|
A vigorous tropical wave moved off Africa on September 7, aiding in the formation of Hurricane Edouard before entering the East Pacific on September 19. There, it interacted with pre-existing southwesterly flow, eventually leading to the formation of a tropical depression around 18:00 UTC on September 23. Moderate northeast wind shear prevented the west-northwest-moving depression from becoming Tropical Storm Rachel until 00:00 UTC on September 25. The next day, Rachel's original center dissipated and a new one formed under deep convection. Environmental conditions became more favorable on September 17, when the cyclone reached hurricane strength at 18:00 UTC. It attained peak winds of 85 mph (140 km/h) six hours later before dry air, wind shear, and cooler waters caused a quick decay as the storm moved north. Rachel fell below hurricane strength around 06:00 UTC on September 29 and degenerated to a remnant low by 12:00 UTC the next morning. It dissipated early on October 3.
|Category 4 hurricane (SSHWS)|
|Duration||October 1 – October 7|
|Peak intensity||130 mph (215 km/h) (1-min) 946 mbar (hPa)|
A tropical wave departed Africa on September 14 and continued into the eastern Pacific ten days later, where it interacted with the ITCZ and produced a large area of convection. An area of low pressure developed within this convection and organized while moving west-northwest, becoming a tropical depression by 18:00 UTC on October 1 and intensifying into Tropical Storm Simon twelve hours later. Simon only slowly strengthened initially, limited by its broad size. However, beginning around 18:00 UTC on October 3, it began a 30-hour period of rapid intensification wherein maximum winds increased from 65 mph (100 km/h) to 130 mph (215 km/h), a Category 4 hurricane. The system turned northwest around the periphery of a ridge, tracking into a region of low ocean heat content that prompted cold water upwelling. Simon rapidly weakened to a tropical storm early on October 6 before gradually degenerating to a remnant area of low pressure around 00:00 UTC on October 8. The post-tropical cyclone turned east and moved ashore Baja California Sur several hours later before dissipating over rugged terrain by 06:00 UTC the next day.
|Category 1 hurricane (SSHWS)|
|Duration||October 13 – October 26|
|Peak intensity||85 mph (140 km/h) (1-min) 985 mbar (hPa)|
An area of deep convection and a low pressure area merged and became Tropical Depression Two-C on October 13. It slowly intensified and turned northwestward, developing into Tropical Storm Ana. The storm continued intensifying and was upgraded to a strong tropical storm. Ana turned westward, strengthening into a Category 1 hurricane on October 17. As Ana kept south of the island chain, the hurricane produced large waves and winds. Consequently, the Central Pacific Hurricane Center initiated tropical storm watches. Ana was downgraded to a tropical storm very early on October 20.
Beginning on October 15, various tropical cyclone warnings and watches were issued for Hawaii, starting with a tropical storm watch for the Big Island. Three days later, a tropical storm warning was issued for Kauai and Nihau, and was extended to include portions of the Papahānaumokuākea Marine National Monument. The threat of the storm forced parks and beaches to close in the state. While passing south of Hawaii, Ana produced heavy rainfall on most of the islands, peaking at 11.67 in (296 mm) at Keaumo on the Big Island. The rains caused the Sand Island water treatment plant in Honolulu to overflow, which sent about 5,000 gallons of partially treated wastewater into Honolulu Harbor. On October 25, Ana was downgraded to a tropical storm for the second time. Ana continued on a track to the northwest and weakened even further. The system eventually turned north and once again re-strengthened into a high-end tropical storm. Ana turned northwest and soon northeast, fluctuating in strength before being picked up by the jet stream. While racing off to the northeast at nearly 35 knots, Ana once again strengthened into a Category 1. After yet again being downgraded to a tropical storm, Ana became extratropical far to the northeast of Hawaii on October 26.
|Tropical storm (SSHWS)|
|Duration||October 17 – October 19|
|Peak intensity||65 mph (100 km/h) (1-min) 998 mbar (hPa)|
A broad area of low pressure became established across the East Pacific during the first week of October. In conjunction with an eastward-moving convectively-coupled kelvin wave and a Tehuantepecer, a significant increase in convection in association with the low was observed. Following several days of consolidation, the disturbance acquired sufficient organization to be declared a tropical depression at 12:00 UTC on October 17; six hours later, it was upgraded to Tropical Storm Trudy. Amid an exceptionally favorable environment, Trudy quickly intensified as it moved north-northwestward, with the formation of an inner core and eye evident on conventional and microwave satellite imagery. At 09:15 UTC on October 18, the cyclone reached peak winds of 65 mph (100 km/h) as it moved ashore just southeast of Marquelia, Mexico. Trudy quickly weakened following landfall, weakening to a tropical depression at 18:00 UTC and dissipating by 06:00 UTC on October 19, while located over the mountains of southern Mexico. Trudy's remnant energy continued across Mexico and contributed to the development of Tropical Storm Hanna/Tropical Depression Nine on October 21, 2014.
In preparation for the cyclone, various tropical cyclone watches and warnings were issued for the coastline of southeastern Mexico.A "yellow" alert was initially activated for Guerrero; however, following Trudy's period of rapid intensification, this was abruptly upgraded to a "red" alert for southeastern portions of the state as well as southwestern Oaxaca, and the remainder of the two states were placed under an "orange" alert. Upon making landfall, torrential rainfall associated with the cyclone caused numerous landslides and flooding. Approximately 4,075 people were evacuated from the most-at-risk locations. A total of 5,000 homes were affected by the storm, 218 of which damaged and an additional six completely destroyed. At the height of the storm, more than 20,000 households were without electricity. A state of emergency was declared for 35 municipalities across Guerrero and 100 municipalities in Oaxaca. Overall, Trudy was responsible for nine deaths: eight in Guerrero and one in Campeche.
|Category 2 hurricane (SSHWS)|
|Duration||October 30 – November 5|
|Peak intensity||110 mph (175 km/h) (1-min) 964 mbar (hPa)|
A trough that extended from the Atlantic's Tropical Storm Hanna into the eastern Pacific led to widespread convection south of the Gulf of Tehuantepec in late October. This disturbance remained disorganized until 06:00 UTC on October 30, when a well-defined center and organized thunderstorm activity led to the formation of a tropical depression. The cyclone intensified into Tropical Storm Vance twelve hours later but ultimately weakened some due to the entrainment of dry air. After drifting for a day, mid-level ridging over the far eastern Pacific caused the storm to move west-northwest. Improving environmental conditions allowed it to become a hurricane around 12:00 UTC on November 2 and rapidly strengthen to a Category 2 with winds of 110 mph (175 km/h) the next day. Vance curved northeast into a higher shear environment by November 4, causing the system to weaken from a Category 2 hurricane to a tropical depression in an 18-hour period. The depression opened up into a trough around 12:00 UTC on November 5 and moved ashore Sinaloa and Nayarit several hours later before dissipating.
Heavy rains from the remnants of Vance, lasting 40 hours in some places, damaged 2,490 homes across 7 municipalities in the Mexican state of Durango. Flooding up to 1 m (3.3 ft) in depth affected ten homes in San Dimas. Thirty families in the area were evacuated due to the rising water. A few landslides were reported in the region, though no major damage resulted.
The following names were used to name storms that formed in the northeastern Pacific Ocean during 2014. Retired names, were announced by the World Meteorological Organization in the spring of 2015. The names not retired from this list will be used again in the 2020 season.This is the same list used in the 2008 season with the exception of Amanda, which replaced Alma; the name Amanda was used for the first time this year.
For storms that form in the Central Pacific Hurricane Center's area of responsibility, encompassing the area between 140°W and the International Date Line, all names are used in a series of four rotating lists.The next four names slated for use are shown below. Two names, Wali and Ana, were used.
On April 17, 2015, at the 37th session of the RA IV hurricane committee, the name Odile was retired due to the damage and deaths it caused and will not be used for another Pacific hurricane. Odile will be replaced with Odalys for the 2020 Pacific hurricane season.
This is a table of all of the storms that have formed in the 2014 Pacific hurricane season. It includes their duration, names, landfall(s), denoted in parenthesis, damages, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but were still related to that storm. Damage and deaths include totals while the storm was extratropical, a wave, or a low, and all of the damage figures are in 2014 USD.
|Dates active||Storm category |
at peak intensity
|Amanda||May 22 – 29||Category 4 hurricane||155 (250)||932||Southwestern Mexico, Western Mexico||Minimal||3|
|Boris||June 2 – 4||Tropical storm||45 (75)||998||Southwestern Mexico, Guatemala||$54.1 million||6|
|Cristina||June 9 – 15||Category 4 hurricane||150 (240)||935||Southwestern Mexico, Western Mexico||Minimal||None|
|Douglas||June 28 – July 5||Tropical storm||50 (85)||999||None||None||None|
|Elida||June 30 – July 2||Tropical storm||50 (85)||1002||Western Mexico||None||None|
|Fausto||July 7 – 9||Tropical storm||45 (75)||1004||None||None||None|
|Wali||July 17 – 19||Tropical storm||45 (75)||1003||None||None||None|
|Genevieve||July 25 – August 7||Category 3 hurricane||115 (185)||965||None||None||None|
|Hernan||July 26 – 29||Category 1 hurricane||75 (120)||992||None||None||None|
|Iselle||July 31 – August 9||Category 4 hurricane||140 (220)||947||Hawaii||>$148 million||1|
|Julio||August 4 – 15||Category 3 hurricane||120 (195)||960||Hawaii||None||None|
|Karina||August 13 – 26||Category 1 hurricane||85 (140)||983||None||None||None|
|Lowell||August 17 – 24||Category 1 hurricane||75 (120)||980||None||None||None|
|Marie||August 22 – 28||Category 5 hurricane||160 (260)||918||Southwestern Mexico, Southern California||$20 million||6|
|Norbert||September 2 – 7||Category 3 hurricane||125 (205)||950||Western Mexico, Baja California Peninsula, Southwestern United States||$28.3 million||5|
|Odile||September 10 – 18||Category 4 hurricane||140 (220)||918||Western Mexico, Baja California Peninsula, Northwestern Mexico, Southwestern United States, Texas||$1.25 billion||18|
|Sixteen-E||September 11 – 15||Tropical depression||35 (55)||1005||Baja California Sur||None||None|
|Polo||September 16 – 22||Category 1 hurricane||75 (120)||979||Western Mexico, Baja California Peninsula||$7.6 million||1|
|Rachel||September 24 – 30||Category 1 hurricane||85 (140)||980||None||None||None|
|Simon||October 1 – 7||Category 4 hurricane||130 (215)||946||Western Mexico, Baja California Peninsula, Southwestern United States||Unknown||None|
|Ana||October 13 – 26||Category 1 hurricane||85 (140)||985||Hawaii, Western Canada, Alaskan Panhandle||Minimal||None|
|Trudy||October 17 – 19||Tropical storm||65 (100)||998||Southwestern Mexico||>$12.3 million||9|
|Vance||October 30 – November 5||Category 2 hurricane||110 (175)||964||Western Mexico, Northwestern Mexico||Minimal||None|
|23 systems||May 22 – November 5||160 (260)||918||≥$1.52 billion||49|
The 2000 Atlantic hurricane season was the first Atlantic hurricane season without a tropical cyclone in the month of July since 1993. The hurricane season officially began on June 1, and ended on November 30. It was slightly above average due to a La Niña weather pattern although most of the storms were weak. The first cyclone, Tropical Depression One, developed in the southern Gulf of Mexico on June 7 and dissipated after an uneventful duration. However, it would be almost two months before the first named storm, Alberto, formed near Cape Verde; Alberto also dissipated with no effects on land. Several other tropical cyclones—Tropical Depression Two, Tropical Depression Four, Chris, Ernesto, Nadine, and an unnamed subtropical storm—did not impact land. Five additional storms—Tropical Depression Nine, Florence, Isaac, Joyce, and Leslie—minimally affected land areas.
The 1978 Atlantic hurricane season was the last Atlantic hurricane season to use an all-female naming list. The hurricane season officially began on June 1, and ended on November 30. It was an above average season due to a subsiding El Niño. The first storm, a subtropical storm, developed unusually early – on January 18 – and dissipated five days later without causing any damage. At the end of July and early August, short-lived Tropical Storm Amelia caused extensive flooding in Texas after dropping as much as 48 in (1,200 mm) of rain. There were 33 deaths and $110 million (1978 USD) in damage. Tropical Storm Bess and Hurricane Cora resulted in only minor land impacts, while the latter was attributed to one fatality.
The 1989 Atlantic hurricane season was an average season with 11 named storms. The season officially began on June 1, and ended on November 30. The first storm, Tropical Depression One, developed on June 15, and dissipated two days later without effects on land. Later that month, Tropical Storm Allison caused severe flooding, especially in Texas and Louisiana. Tropical Storm Barry, Tropical Depressions Six, Nine, and Thirteen, and Hurricanes Erin and Felix caused negligible impact. Hurricane Gabrielle and Tropical Storm Iris caused light effects on land, with the former resulting in nine fatalities from rip currents offshore the East Coast of the United States and Atlantic Canada, while the latter produced minor flooding in the United States Virgin Islands.
The 2004 Pacific hurricane season was notable in that no tropical cyclone of at least tropical storm intensity moved ashore, an unusual occurrence. The season officially began on May 15 in the eastern Pacific, and on June 1 in the central Pacific; it officially ended in both basins on November 30. These dates conventionally delimit the period during each year when a majority of tropical cyclones form. Activity throughout the year fell slightly below the long-term average, with 12 named storms, 6 hurricanes, and 3 major hurricanes. The season was reflected by an Accumulated Cyclone Energy (ACE) index of 71 units.
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.
The 2008 Atlantic hurricane season was the most disastrous Atlantic hurricane season since 2005, causing over 1,000 deaths and nearly $50 billion in damages. It was an above-average season, featuring sixteen named storms, eight of which became hurricanes, and five which further became major hurricanes, the highest number since the record-breaking 2005 season. It officially started on June 1 and ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. However, the formation of Tropical Storm Arthur caused the season to start one day early. This season is the fifth most costly on record, behind only the 2004, 2005, 2012 and 2017 seasons, with over $49.5 billion in damage. It was the only year on record in which a major hurricane existed in every month from July through November in the North Atlantic.Bertha became the longest-lived July tropical cyclone on record for the basin, the first of several long-lived systems during 2008.
The 2007 Pacific hurricane season was a below-average Pacific hurricane season, featuring one major hurricane. The season officially started on May 15 in the eastern Pacific and on June 1 in the central Pacific, and ended on November 30; these dates conventionally delimit the period during which most tropical cyclones form in the region. The first tropical cyclone of the season, Alvin, developed on May 27, while the final system of the year, Kiko, dissipated on October 23. Due to unusually strong wind shear, activity fell short of the long-term average, with a total of 11 named storms, 4 hurricanes, and 1 major hurricane. At the time, 2007 featured the second-lowest value of the Accumulated cyclone energy (ACE) index since reliable records began in 1971. Two tropical cyclones – Cosme and Flossie – crossed into the central Pacific basin during the year, activity below the average of 4 to 5 systems.
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 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.
The 2013 Pacific hurricane season was the costliest Pacific hurricane season on record, with a total of about $4.2 billion in damages. The season produced above normal activity; however, the majority of the storms were weak. The season officially began on May 15, 2013 in the Eastern Pacific and started on June 1, 2013 in the Central Pacific. Both ended on November 30, 2013. These dates conventionally delimit the period of each year when most tropical cyclones form in the eastern Pacific basin. However, the formation of a storm is possible at any time.
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.
The 2010 Pacific hurricane season was one of the least active seasons on record, featuring the fewest named storms since 1977. The season officially started on May 15 in the eastern Pacific—east of 140°W—and on June 1 in the central Pacific—between the International Date Line and 140°W—and lasted until November 30. These dates typically cover the period of each year when most tropical cyclones form in the eastern Pacific basin. The season's first storm, Tropical Storm Agatha, developed on May 29; the season's final storm, Tropical Storm Omeka, degenerated on December 21.
The 2013 Atlantic hurricane season was a well below average Atlantic hurricane season and the first since 1994 with no major hurricanes. It was also the first season since 1968 with no storms of at least Category 2 intensity on the Saffir–Simpson hurricane wind scale. The first tropical cyclone of this hurricane season, Andrea, developed on June 5, while the final cyclone, an unnamed subtropical storm, dissipated on December 7. Throughout the year, only two storms—Humberto and Ingrid—reached hurricane intensity; this was the lowest seasonal total since 1982.
The 2012 Pacific hurricane season was an above-average year in which seventeen named storms formed. The hurricane season officially began on May 15 with the formation of Tropical Storm Aletta in the East Pacific—defined as the region east of 140°W—and on June 1 in the central Pacific—defined as the region west of 140°W to the International Date Line—and ended on November 30 in both basins. These dates conventionally delimit the period during each year when most tropical cyclones form. The final cyclone of the year, Tropical Storm Rosa, dissipated on November 3.
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.
The 2013 Atlantic hurricane season was a below-average season, featuring the fewest hurricanes since 1982. Although Tropical Storm Andrea formed on June 5, the season officially began on June 1 and ended on November 30, dates that conventionally delimit the period of each year when most tropical cyclones develop in the Atlantic basin. The season's final storm, an unnamed subtropical storm, dissipated on December 7.
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.
The 2014 Atlantic hurricane season was a below-average Atlantic hurricane season, featuring the fewest named storms since 1997. The season officially began on June 1 and ended on November 30, dates that conventionally delimit the period of each year when most tropical cyclones develop in the Atlantic basin. The season's first storm, Hurricane Arthur, developed on July 1; the season's final storm, Tropical Storm Hanna, degenerated on October 28.
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.
The 2018 Pacific hurricane season produced the highest accumulated cyclone energy (ACE) value on record. With 23 named storms, it was the fourth-most active season on record, tied with 1982. The season officially began on May 15 in the eastern Pacific, and on June 1 in the central Pacific; they both ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin, as illustrated when the first tropical depression formed on May 10.
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