Pacific hurricane

This article is about tropical cyclones that form in the Northern Hemisphere east of theInternational Date Line.For storms that form in the southern hemisphere, also occasionally known as hurricanes, seeSouth Pacific tropical cyclone.

Cumulative average number oftropical cyclonesin the north Pacific

APacific hurricaneis atropical cyclonethat develops within the northeastern 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 (North America to 140°W), central (140°W to 180°), and western (180° to 100°E), while the southern Pacific is divided into 2 sections, the Australian region (90°E to 160°E) and the southern Pacific basin between 160°E and 120°W.Identical phenomena in the western north Pacific are calledtyphoons.This separation between the two basins has a practical convenience, however, as tropical cyclones rarely form in the central north Pacific due to highvertical wind shear,and few cross the dateline.

List of seasons

Historical storm formation by month between 1990 and 2020

25 50 75 100 125 150 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Category 5 Category 4 Category 3 Category 2 Category 1 Tropical storm Tropical depression

Period	Seasons
Pre-1920s	Before 1900,1900s,1910s
1920s	1920–1924,1925,1926,1927,1928,1929
1930s	1930,1931,1932,1933,1934,1935,1936,1937,1938,1939
1940s	1940,1941,1942–1948,1949
1950s	1950,1951,1952,1953,1954,1955,1956,1957,1958,1959
1960s	1960,1961,1962,1963,1964,1965,1966,1967,1968,1969
1970s	1970,1971,1972,1973,1974,1975,1976,1977,1978,1979
1980s	1980,1981,1982,1983,1984,1985,1986,1987,1988,1989
1990s	1990,1991,1992,1993,1994,1995,1996,1997,1998,1999
2000s	2000,2001,2002,2003,2004,2005,2006,2007,2008,2009
2010s	2010,2011,2012,2013,2014,2015,2016,2017,2018,2019
2020s	2020,2021,2022,2023,2024

1950s

Year	TD	TS	HU	MH	Strongest storm	Deaths	Damages (USD)	Notes
1950	–	7	6	0	1Hiki	1	Unknown	Includes Hiki, thethird wettesttropical cyclone in theUnited States.
1951	–	9	2	0	1Two 1Eight	0	Unknown
1952	–	7	3	0	1Five 1Seven	0	Unknown
1953	–	4	2	0	TSOne	0	Unknown
1954	11	11	4	0	TSSeven	40	Unknown
1955	–	6	2	0	1One	0	Unknown
1956	–	11	7	0	1One	0	Unknown
1957	–	13	9	1	4Twelve	21	$100,000
1958	14	14	5	0	1Eleven	0	Unknown
1959	15	15	5	3	5Patsy	>1,800	$280 million	Patsy was the first known category 5 hurricane in the Central Pacific basin. Includes the deadliest tropical cyclone in the Eastern Pacific, the1959 Mexico hurricane.

1960s

Year	TD	TS	HU	MH	Strongest storm	Deaths	Damages (USD)	Notes
1960	8	8	5	0	1Estelle	0	Unknown
1961	11	10	2	0	1Iva	436	$16 million
1962	18	12	2	0	1Doreen	Unknown	$11 million
1963	8	8	4	0	1Mona	Unknown	Unknown
1964	6	6	2	0	2Odessa	Unknown	Unknown	Least active season since1953.
1965	11	10	1	0	1Emily	6	$10 million
1966	18	13	8	0	1Connie	9+	$5.6 million	Includes the farthest traveled storm in the Eastern Pacific,Blanca.
1967	17	17	6	1	3Olivia	121	Unknown
1968	26	20	6	0	1Rebecca	9	Unknown	Tied with2009for having the most storms named in the month of August.
1969	15	10	4	0	1Doreen	10	Unknown	Includes the latest first-named storm at that time,Ava,which formed in July.

1970s

Year	TD	TS	HU	MH	ACE	Strongest storm	Deaths	Damages (USD)	Notes
1970	21	19	5	0	–	2Lorraine	22	Unknown
1971	22	18	12	6	139	3Olivia	52	$40 million	First year of reliable records in the eastern and central Pacific basins.
1972	20	14	9	4	136	4Celeste	1	$75,000
1973	18	12	7	3	114	5Ava	0	Unknown	Featured the strongest hurricane in the basin at the time and the earliest category five in the Eastern Pacific on record.
1974	25	18	11	3	90	4Maggie	18–33	$4 million	Featured one of the most active periods of tropical cyclones on record with five existing simultaneously (Ione,Joyce,Kirsten,Lorraine,andMaggie).
1975	21	17	9	4	112	4Denise	30	$20 million
1976	19	15	9	5	121	4Annette	614–964	$360 million
1977	17	8	4	0	22	2Florence	8	$39.6 million	Least active season until2010. Featured no major hurricanes, tied with2003.
1978	25	19	14	7	207	4Fico 4Hector 4Norman	4	$301 million	First season to use masculine and feminine names.
1979	13	10	6	4	57	4Ignacio	Unknown	Unknown	Most recent year in which no tropical cyclones crossed into the Central Pacific basin.
Total	201	150	86	36	1110	Ava	767–1,102	≥$385.075 million

1980s

Year	TD	TS	HU	MH	ACE	Strongest storm	Deaths	Damages (USD)	Notes
1980	16	15	7	3	77	4Kay	0	Unknown
1981	17	15	8	1	72	3Norma	79	$134 million
1982	30	23	12	5	161	4Olivia	1,937	$1.3 billion	Fifth most active season on record.
1983	26	21	12	8	206	4Kiko 4Raymond	168	$303.33 million	Tied with1984for the fourth most active season at the time.
1984	26	21	13	7	193	4Douglas	21	Unknown	Tied with1983for the fourth most active season at the time.
1985	28	24	12	8	192	4Rick	1	$1 million	Third most active season on record. Tied with2018for having five named storms in the month of June. Tied with2015and2016for the most active month of July since reliable records began.
1986	26	17	9	3	107	4Roslyn	2	$352 million
1987	20	20	10	4	132	4Max	3	$144.22 million	Last year in which theEastern Pacific Hurricane Centerwas the primary warning center for tropical cyclones in the eastern Pacific Ocean.
1988	23	15	7	3	127	4Hector	24	Unknown	Hurricane Joancrossed over Central America and was namedMiriamin the Eastern Pacific basin.
1989	25	18	9	4	110	4Raymond	14	$1.75 million
Total	237	189	99	46	1377	Max	2,250	≥$2.240 billion

1990s

Year	TD	TS	HU	MH	ACE	Strongest storm	Deaths	Damages (USD)	Notes
1990	27	21	16	6	245	4Trudy	19	$12.5 million	Fifth most active season on record and third most active in terms of ACE. Tied with1992,2014,and2015for the most hurricanes in a single season.
1991	16	14	10	5	178	4Kevin	11	Unknown
1992	30	27	16	10	295	4Tina	25	$3.15 billion	Second-most active Pacific hurricane season on record in terms of ACE. Tied with1990,2014,and2015for the most hurricanes in a single season. Includes the strongest hurricane on record to strike Hawaii,Iniki. Hurricane Ekekais the most intense off-season hurricane in the Pacific basin.
1993	18	15	11	9	201	4Lidia	50	$40 million
1994	23	20	10	5	185	5Gilma	26	$735 million	Tied with2002and2018for having the most category 5 hurricanes in a single season. Includes the tropical cyclone that travelled the farthest distance on record,Hurricane John.It was also the longest-lasting tropical cyclone ever observed until surpassed byCyclone Freddyin 2023.
1995	11	10	7	3	100	4Juliette	124	$31 million	Least active season since1979.
1996	14	9	5	2	53	4Douglas	48	$813,000	Tied with2021for the most hurricanes to strike Mexico in a single season. Hurricane Cesarcrossed over from Central America and was renamed Douglas in the Pacific basin.
1997	24	19	9	7	167	5Linda	261–531	$551 million	Hurricane Linda was the most intense hurricane in the Pacific basin untilPatriciain2015.
1998	16	13	9	6	134	4Howard	54	$760 million
1999	14	9	6	2	90	4Dora	16	None
Total	193	157	99	55	1,648	Linda	581–853	≥$4.9 billion

2000s

Year	TD	TS	HU	MH	ACE	Strongest storm	Deaths	Damages (USD)	Notes
2000	21	19	6	2	95	4Carlotta	27	$84 million
2001	19	15	8	2	90	4Juliette	13	$401 million
2002	19	15	8	6	124	5Kenna	7	$101 million	Tied with1994and2018for having the most category 5 hurricanes in a single season. Includes the fourth most intense hurricane in the Pacific basin, Kenna.
2003	17	16	7	0	56	2Nora	23	$129 million	Featured no major hurricanes, tied with1977.
2004	18	12	6	3	71	4Javier	None	None
2005	17	15	7	2	96	4Kenneth	6	$12 million
2006	25	19	11	6	155	5Ioke	14	$355 million	Most active since2000. Includes the most intense hurricane in the Central Pacific basin, Ioke.
2007	15	11	4	1	52	4Flossie	42	$80 million
2008	19	17	7	2	83	4Norbert	45	$153 million
2009	23	20	8	5	127	5Rick	16	$226 million	Most active since1994. Tied with1968for having the most storms named in the month of August. Includes the third most intense hurricane in the Pacific basin, Rick.
Total	192	159	72	29	949	Rick	193	≥$1.54 billion

2010s

Year	TD	TS	HU	MH	ACE	Strongest storm	Deaths	Damages (USD)	Notes
2010	13	8	3	2	52	5Celia	268	$1.62 billion	Least active Pacific hurricane season on record, tied with1977. Includes aCategory 5 hurricanein the basin, Celia. Includes a rare-off season in the month of December,Omeka.
2011	13	11	10	6	121	4Dora	43	>$203.67 million
2012	17	17	10	5	98	4Emilia	8	$27.9 million
2013	21	20	9	1	76	3Raymond	194	$4.56 billion
2014	23	22	16	9	199	5Marie	49	>$1.52 billion	Fourth most active season on record. Tied with1990,1992,and2015for the most hurricanes in a single season.
2015	31	26	16	11	287	5Patricia	45	$566 million	Second most active season on record. Includes the most intense hurricane in the Pacific basin, Patricia. Tied with1990,1992,and2014for the most hurricanes in a single season. Tied with1985and2016for the most active month of July since reliable records began. Latest ending to a season on record.
2016	23	22	13	6	183	4Seymour	11	$95.8 million	Earliest start on record in the Pacific basin. Fourth most active season on record. Tied with1985and2015for the most active month of July since reliable records began. Agathawas the latest forming first-named storm on record in the Eastern Pacific since reliable records began.
2017	20	18	9	4	100	4Fernanda	45	$375.28 million
2018	26	23	13	10	318	5Walaka	56	>$1.46 billion	Fourth-most active season on record. Most active Pacific hurricane season on record in terms of ACE. Tied with1985for the most named storms on record in the month of June (5). Tied with1994and2002for having the most Category 5 hurricanes in a single season.
2019	21	19	7	4	97	4Barbara	7	$16.1 million	Third-latest first named storm since reliable records began in 1971. No hurricanes formed in August for the first time since1973.
Total	208	186	106	58	1531	Patricia	723	≥$10.2 billion

2020s

Year	TD	TS	HU	MH	ACE	Strongest storm	Deaths	Damages (USD)	Notes
2020	21	17	4	3	77.3	4Marie	47	>$276.91 million	Least active season since2011. First season in which no tropical cyclones formed in the Central Pacific basin. Featured one unnamed tropical storm which was operationally classified as a tropical depression.
2021	19	19	8	2	94	4Felicia	13	>$255 million	Earliest start to a season east of 140°E on record, second earliest fifth named storm on record. Second consecutive in which no tropical cyclones formed in the Central Pacific basin. Five systems made landfall in Mexico.
2022	19	19	10	4	116.5	4Darby	33	>$123.3 million	Featured two tropical cyclones that crossed over from the Atlantic (BonnieandJulia). Third consecutive in which no tropical cyclones formed in the Central Pacific basin. Second season in a row to have at least five systems make landfall.
2023	20	17	10	8	163.2	5Otis	>61	>$16.689 billion	Costliest Pacific hurricane season on record. Adrianwas the second-latest forming first-named storm on record in the Eastern Pacific since reliable records began. Fourth consecutive in which no tropical cyclones formed in the Central Pacific basin. Featured HurricanesJovaandOtis,two of the fastest intensifying Pacific hurricanes on record. Otis was also the first Pacific hurricane to make landfall at Category 5 intensity. Tied with1992for the most named storms in October.
2024	1	1	0	0	0	TSAletta	None	None	Latest start to a Pacific hurricane season on record.
Total	80	73	32	17	451	Otis	154	≥$17.3 billion

History

Tracks of East Pacific tropical cyclones(1980–2005)

Documentation of Pacific hurricanes dates to theSpanish colonization of Mexico,when the military andmissionswrote about "tempestades". In 1730, such accounts indicated an understanding of the storms. After observing the rotating nature of tropical cyclones, meteorologistWilliam Charles Redfieldexpanded his study to include storms in the eastern North Pacific Ocean in the middle of the 19th century. Between June and October 1850, Redfield observed five tropical cyclones along "the southwestern coast of North America", along with one in each of the three subsequent years. In 1895,Cleveland Abbereported the presence of many storms between 5° and 15°–Nin the eastern Pacific, although many such storms dissipated before affecting the Mexican coast. Two years later, the German Hydrography OfficeDeutsche Seewartedocumented 45 storms from 1832 to 1892 off the west coast of Mexico.

Despite the documentation of storms in the region, the official position of theUnited States Weather Bureaudenied the existence of such storms. In 1910, the agency reported on global tropical cyclones, noting that "the occurrence of tropical storms is confined to the summer and autumn months of the respective hemispheres and to the western parts of the several oceans." In 1913, the Weather Bureau reinforced their position by excluding Pacific storms among fivetropical cyclone basins;however, the agency acknowledged the existence of "certain cyclones that have been traced for a relatively short distance along a northwest course... west of Central America."

AfterCaliforniabecame a state and the discovery of gold there in 1848, shipping traffic began increasing steadily in the eastern Pacific. Such activity increased further after thePanama Canalopened in 1914, and the shipping lanes moved closer to the coast. By around 1920, Pacific hurricanes were officially recognized due to widespread ship observations, radio service, and a newly created weather network in western Mexico. Within 60 years, further studies of the region's tropical activity indicated that the eastern Pacific is in fact the second most active basin in the world.

During the 1920s, a few documents in theMonthly Weather Reviewreported additional storms within 2,000 mi (3,200 km) off the Mexican coastline.

The Eastern and Central Pacific hurricane database

The Eastern Pacific hurricane best track database was initially compiled onmagnetic tapein 1976 for the seasons between 1949 and 1975, at the NHC to help with the development of twotropical cyclone forecast models,which required tracks of past cyclones as a base for its predictions.The database was based on records held by the United States Navy and were interpolated from 12 hourly intervals to 6 hourly intervals based on a scheme devised by Hiroshi Akima in 1970.Initially tracks for the Central Pacific region and tracks for tropical depressions that did not develop into tropical storms or hurricanes were not included within the database.After the database had been created Arthur Pike of the NHC made some internal adjustments, while in 1980 a review was made by Arnold Court under contract from theUnited States National Weather Serviceand resulted in additions and/or modifications to 81 tracks in the database.Between 1976 and 1987, the NHC archived best track data from theEastern Pacific Hurricane Center(EPHC),and in 1982 started including information on Central Pacific tropical storms and hurricanes started to be included in the database based on data from theJoint Typhoon Warning Centerand research done by Samuel Shaw of theCentral Pacific Hurricane Center(CPHC)in 1981.

The format of the database was completely revised by the NHC during 1984, so that the format could resemble the Atlantic database before they took over the warning responsibility from the EPHC for the Eastern Pacific during 1988.During 2008 and 2013 several revisions were made to the database to extend tracks in land, based on reports in theMariners Weather Logand extrapolation of the tracks since the EPHC stopped issuing advisories on systems before they made landfall.The archives format was significantly changed during 2013 to include non-synoptic best track times, non-developing tropical depressions and wind radii.During February 2016, the NHC released the1959 Mexico hurricane's reanalysis, which was the first system to be reassessed, using methods developed for the Atlantic reanalysis process.

Climatology

The presence of a semi-permanenthigh-pressure areaknown as theNorth Pacific Highin the eastern Pacific is a dominant factor against the formation of tropical cyclones in the winter, as the Pacific High results inwind shearthat causes unfavorable, environmental conditions for tropical cyclone formation. Its effects in the central Pacific basin are usually related to keeping cyclones away from the Hawaiian Islands. Due to westwardtrade winds,hurricanes in the Pacific rarely head eastward, unless recurved by a trough. A second factor preventing tropical cyclones from forming during the winter is the occupation of a semi-permanentlow-pressure areadesignated theAleutian Lowbetween January and April. Its presence over western Canada and the northwestern United States contributes to the area's occurrences of precipitation in that duration. In addition, its effects in the central Pacific near 160° W causes tropical waves that form in the area to drift northward into theGulf of Alaskaand dissipate. The retreat of this low allows the Pacific High to also retreat into the central Pacific, leaving a warm and moist environment in its wake. TheIntertropical Convergence Zonecomes northward into the East Pacific in mid-May permitting the formation of the earliesttropical waves,coinciding with the start of the eastern Pacific hurricane season on May 15.

TheEl Niño–Southern Oscillationalso influences the frequency and intensity of hurricanes in the Northeast Pacific basin. DuringEl Niñoevents,sea surface temperaturesincrease in the Northeast Pacific and vertical wind shear decreases. Because of this, an increase in tropical cyclone activity occurs; the opposite happens in theAtlantic basinduring El Niño, where increased wind shear creates an unfavorable environment for tropical cyclone formation.Contrary to El Niño,La Niñaevents increase wind shear and decreases sea surface temperatures over the eastern Pacific, while reducing wind shear and increasing sea surface temperatures over the Atlantic.

Eastern North Pacific

Historical East Pacific Seasonal Activity, 1971–2007. Data on ACE is considered reliable starting with the 1971 season

Hurricane season runs between May 15 and November 30 each year.These dates encompass the vast majority of tropical cyclone activity in this region.

TheRegional Specialized Meteorological Centerfor this basin is theUnited States'National Hurricane Center.Previous forecasters are theEastern Pacific Hurricane Centerand theJoint Hurricane Warning Center.The RSMC monitors the eastern Pacific and issues reports, watches and warnings about tropical weather systems and cyclones as defined by theWorld Meteorological Organization.

This area is, on average, the second-most active basin in the world. There are an average of 16 tropical storms annually, with 9 becoming hurricanes, and 4 becoming major hurricanes.Tropical cyclones in this region frequently affect mainlandMexicoand theRevillagigedo Islands.Less often, a system will affect theContinental United StatesorCentral America.Northbound hurricanes typically reduce to tropical storms or dissipate before reaching the United States: there is only one recorded case of a Pacific system reachingCaliforniaas a hurricane in almost 200 years of observations—the1858 San Diego Hurricane.

Most east Pacific hurricanes originate from a tropical wave that drifts westward across the intertropical convergence zone, and across northern parts of South America. Once it reaches the Pacific, a surface low begins to develop, however, with only little or no convection. After reaching the Pacific, it starts to move north-westward and eventually west. By that time, it develops convection and thunderstorm activity from the warm ocean temperatures but remains disorganized. Once the tropical wave becomes organized, it becomes a tropical depression. Formation usually occurs from south of the Gulf of Tehuantepec to south of Baja California with a more westerly location earlier in the season. In the eastern Pacific, development is more centered than anywhere else. If wind shear is low, a tropical cyclone can undergorapid intensificationas a result of very warm oceans, becoming a major hurricane. Tropical cyclones weaken once they reach unfavorable areas for a tropical cyclone formation. Their remnants sometimes reach Hawaii and cause showers there.

There are a few types of Pacific hurricane tracks: one is a westerly track, another moves north-westward along Baja California and another moves north. Sometimes storms can move north-east either across Central America or mainland Mexico and possibly enter the Caribbean Sea becoming aNorth Atlantic hurricane,but these are rare.

Central Pacific

Hurricane season runs from June 1 to November 30, with a strong peak in August and September. However, tropical cyclones have formed outside those dates.TheCentral Pacific Hurricane Centeris the RSMC for this basin and monitors the storms that develop or move into the defined area of responsibility. A previous forecaster was theJoint Hurricane Warning Center.

It is rare that tropical cyclones form in the Central Pacific, though on average 3 or 4 storms move into this area per year, primarily from the Eastern Pacific, but also on rare occasions from across the International Dateline in the Western Pacific. Most often, storms that occur in the area are weak and often decline in strength upon entry. The only land masses impacted by tropical cyclones in this region areHawaiiandJohnston Atoll.Due to the small size of the islands in relation to the Pacific Ocean, direct hits and landfalls are rare.

Steering factors

See also:Tropical cyclone track forecastingandSubtropical ridge

Hurricanes in the Eastern Pacific tend to move westward out to sea, harming no land—unless they cross into the Central Pacific or Western Pacific basins, in which case they might harm land such as Hawaii or Japan. However, hurricanes can recurve to the north or northeast, hitting Central America or Mexico early and late in the hurricane season.

Extremes

Main article:List of Pacific hurricane records

• The strongest recorded Pacific hurricane wasHurricane Patricia(2015), with 1-minutemaximum sustained windsof 215 mph (345 km/h) and a minimumbarometric pressureof 872 mbar (hPa; 25.75 inHg). This ranks Patricia as the strongest tropical cyclone globally in terms of 1-minute sustained winds and the second strongest globally in terms of barometric pressure.
• Hurricane John (1994)was the farthest-travelling tropical cyclone worldwide, traversing 7,165 mi (13,280 km) in 30 days and 18 hours.
• The1959 Mexico hurricanewas the deadliest Pacific hurricane, causing 1,800 fatalities mostly inColimaandJalisco.

See also

• Atlantic hurricane
• Cordonazo wind
• Tropical cyclone
• Typhoon
• Atlantic hurricane season
• Pacific typhoon climatology
• Pacific typhoon season
• North Indian Ocean tropical cyclone season
• South-West Indian Ocean tropical cyclone season
• Australian region tropical cyclone season
• South Pacific tropical cyclone season
• South Atlantic tropical cyclone
• Mediterranean tropical-like cyclone
• List of tropical cyclone records