2018 Pacific hurricane season

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.[1] 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.

The second named storm of the season, Hurricane Bud, struck Baja California Sur in mid-June, causing minor damage. Tropical Storm Carlotta stalled offshore of the Mexican coastline, where it also caused minor damage. In early August, Hurricane Hector became one of the few tropical cyclones to cross into the Western Pacific from the Eastern Pacific, while also affecting Hawaii. A few weeks later, Hurricane Lane obtained Category 5 intensity while also becoming Hawaii's wettest tropical cyclone on record, and the second wettest tropical cyclone in US history, only behind Hurricane Harvey of the previous year. Hurricane Olivia also struck Hawaii, resulting in slight damage. In late September, Hurricanes Rosa and Sergio formed, both of which eventually brought thunderstorms and flash flooding to the Baja California Peninsula and the Southwestern United States. Meanwhile, Hurricane Walaka attained Category 5 intensity before causing disruptions in the Northwestern Hawaiian Islands. In late October, Hurricane Willa became the record-tying third Category 5 hurricane of the season (tied with the 1994 and 2002 seasons) before striking Sinaloa as a major hurricane. Damage across the basin reached $1.57 billion (2018 USD), while 49 people were killed by the various storms.

2018 Pacific hurricane season
2018 Pacific hurricane season summary map
Season summary map
Seasonal boundaries
First system formedMay 10, 2018
Last system dissipatedNovember 5, 2018
Strongest storm
NameWalaka
 • Maximum winds160 mph (260 km/h)
(1-minute sustained)
 • Lowest pressure920 mbar (hPa; 27.17 inHg)
Seasonal statistics
Total depressions26, 1 unofficial
Total storms23, 1 unofficial
Hurricanes13
Major hurricanes
(Cat. 3+)
10
Total fatalities52 total
Total damage> $1.57 billion (2018 USD)
Related articles

Seasonal forecasts

Record Named
storms
Hurricanes Major
hurricanes
Ref
Average (1981–2010): 15.4 7.6 3.2 [2]
Record high activity: 1992: 27 2015: 16 2015: 11 [3]
Record low activity: 2010: 8 2010: 3 2003: 0 [3]
Date Source Named
storms
Hurricanes Major
hurricanes
Ref
May 24, 2018 NOAA 14–20 7–12 3–7 [4]
May 25, 2018 SMN 18 6 4 [5]
Area Named
storms
Hurricanes Major
hurricanes
Ref
Actual activity: EPAC 22 12 9
Actual activity: CPAC 1 1 1
Actual activity: 23 13 10

On May 24, 2018, 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, 7–12 hurricanes, and 3–7 major hurricanes.[4] The reason for their outlook was the possible development of an El Niño, which reduces vertical wind shear across the basin and increases sea surface temperatures. In addition, many global computer models expected a positive Pacific decadal oscillation (PDO), a phase of a multi-decade cycle that favored much warmer than average sea surface temperatures that had been ongoing since 2014 to continue, in contrast to the 1995–2013 period, which featured below normal activity.[6] On May 25, the Servicio Meteorológico Nacional (SMN) issued its first forecast for the season, predicting a total of 18 named storms, 6 hurricanes, and 4 major hurricanes to develop.[5]

Seasonal summary

Hector, 13E, John and Ileana 2018-08-06
Four tropical cyclones active on August 7: Hector (left), Kristy (middle), John (right), and Ileana (merging with John on the right).
Most intense Pacific
hurricane seasons
Rank Season ACE
1 2018 318
2 1992 295
3 2015 287
4 1990 245
5 1978 207
6 1983 206
7 1993 201
8 2014 199
9 1984 193
10 1985 192

The Accumulated Cyclone Energy index for the 2018 Pacific hurricane season is 318.2 units (202.2925 units for the Eastern Pacific and 115.9075 units for the Central Pacific).[nb 1] Broadly speaking, ACE is a measure of the power of a tropical or subtropical storm multiplied by the length of time it existed. Therefore, a stronger storm with a longer duration, such as Hurricane Hector, contributes more to the seasonal total than several short-lived, weaker storms combined. 2018 has the highest total ACE of any Pacific hurricane season on record, having surpassed the 1992 Pacific hurricane season.

The 2018 season began early with the formation of Tropical Depression One-E on May 10, which formed five days prior to the official start of the season. June was an extraordinarily active month throughout the basin, breaking the record for number of tropical cyclones (six), as well as tying the records for the number of named storms (five) and major hurricanes (two).[7] Fabio's intensification into a tropical storm on July 1 marked the earliest date of a season's sixth named storm, beating the previous record of July 3 set in both 1984 and 1985.[8] Activity abruptly slowed thereafter, with only three tropical cyclones forming during the month of July.[9] One of those cyclones continued to intensify into Hurricane Hector in August, which became the third major hurricane of the season. In August, activity increased dramatically, with Tropical Storm Ileana and Hurricane John forming just a day apart on August 4 and August 5, respectively, followed by Tropical Storm Kristy two days later. Hurricane Lane formed in mid-August and became the first Category 5 storm of the season as well as the wettest tropical cyclone on record in Hawaii.[10] Hurricanes Miriam and Norman soon followed, forming in late August, becoming the seventh and eighth hurricanes of the season, respectively, while Norman became the fifth major hurricane of the season.[11] Hurricane Olivia formed soon after in early September, and became the sixth major hurricane of the season. Short-lived Tropical Storm Paul followed, forming on September 8 and dissipating three days later far from land. The short-lived Tropical Depression Nineteen-E brought destructive floods to western Mexico from September 19 to September 20. During the last days of the month, Hurricane Rosa became the seventh major hurricane of the season, striking Baja California before dissipating on October 2.[12] Forming on September 29, Hurricane Walaka became the second Category 5 hurricane of the season on October 1, making 2018 the first season since 2002 to feature multiple Category 5 hurricanes, and the first since 1994 to feature multiple Category 5 hurricanes in the Central Pacific.

On October 4, Hurricane Sergio became the eighth Category 4 hurricane of the season in the eastern Pacific region, breaking the previous record of seven, which was set in 2015.[13] Activity resumed on October 14 when Tropical Storm Tara formed and hugged the Mexican coast. After a few days of inactivity, two tropical storms developed, named Vicente and Willa. Willa later rapidly intensified and became the thirteenth hurricane of the season.[14] On the next day, Willa strengthened further into a Category 4 hurricane, becoming the season's tenth major hurricane.[15] A day later, Willa strengthened to Category 5 status, making 2018 the third Pacific hurricane season on record to feature three Category 5 hurricanes, after 1994 and 2002.[16] The season concluded with Tropical Storm Xavier, which developed on November 2 and hugged the southwest coast of Mexico before rapidly degenerating into a remnant low on November 6.[17]

Systems

Tropical Depression One-E

Tropical depression (SSHWS)
01E 2018-05-11 2100Z
 
One-E 2018 track
DurationMay 10 – May 11
Peak intensity35 mph (55 km/h) (1-min)  1007 mbar (hPa)

In early May, a westward-tracking trough or tropical wave embedded in the monsoon trough interacted with a convectively-coupled Kelvin wave. This interaction led to a large area of shower and thunderstorm activity well southwest of Mexico,[18] which the National Hurricane Center began monitoring for tropical cyclone formation on May 7.[19] The disturbance organized over the next 48 hours but lacked a well-defined center needed for classification;[20] by late on May 9, environmental conditions were becoming less favorable for development.[21] In spite of this, an increase in convection and formation of a well-defined circulation led to the designation of the season's first tropical depression at 21:00 UTC on May 10.[22] The system failed to intensify after formation and, owing to strong westerly wind shear, ultimately degenerated into a remnant low by 18:00 UTC on May 11.[23]

Hurricane Aletta

Category 4 hurricane (SSHWS)
Aletta 2018-06-08 1825Z
 
Aletta 2018 track
DurationJune 6 – June 11
Peak intensity140 mph (220 km/h) (1-min)  943 mbar (hPa)

A tropical wave departed western Africa on May 22, moving inconspicuously across the Atlantic and failing to develop convection until it was south of the Gulf of Tehuantepec on June 3. Following the formation of a well-defined center, the system was upgraded to a tropical depression around 00:00 UTC on June 6. It intensified into Tropical Storm Aletta six hours later. Subtropical ridging over the United States directed the system west-northwest, while ideal environmental conditions allowed Aletta to reach hurricane strength around 18:00 UTC on June 7.[24] A period of rapid deepening ensued shortly thereafter, with maximum winds increasing from 75 mph (120 km/h) to 140 mph (220 km/h) within an 18-hour period.[25] At peak, the hurricane was characterized by a distinct eye embedded within cloud tops colder than -70 °C (-94 °F).[26] A track into cooler waters and a more stable air mass caused Aletta to weaken as quickly as it intensified, falling from Category 4 strength to a tropical storm within 30 hours. After losing its associated deep convection, the system degenerated to a remnant low around 12:00 UTC on June 11. The low meandered for several days, before dissipating early on June 16.[25]

Hurricane Bud

Category 4 hurricane (SSHWS)
Bud 2018-06-11 2024Z
 
Bud 2018 track
DurationJune 9 – June 15
Peak intensity140 mph (220 km/h) (1-min)  943 mbar (hPa)

A broad area of disturbed weather formed west of Costa Rica on June 5 in association with a westward-moving tropical wave.[27] Gradual organization occurred as the wave tracked generally westward across the eastern Pacific Ocean. On June 9, the disturbance developed a well-defined surface circulation, leading to the classification of a tropical depression at 21:00 UTC.[28] Six hours later, the depression strengthened into Tropical Storm Bud.[29] A mid-level ridge to the storm's north directed it on a northwest heading for several days,[30] while favorable environmental conditions led to rapid intensification. Bud attained hurricane strength by 21:00 UTC on June 10,[31] and continued intensification up to its peak as a Category 4 hurricane with winds of 140 mph (220 km/h) around 00:00 UTC on June 12.[32] The effects of cold water upwelling prompted a rapid weakening trend shortly after peak, with Bud falling to a tropical storm by 12:00 UTC on June 13.[33] The system made landfall near Cabo San Lucas with winds of 45 mph (75 km/h), shortly after 00:00 UTC on June 15, before progressing into the Gulf of California,[34] where it ultimately degenerated to a remnant low around 21:00 UTC that day.[35]

Tropical Storm Carlotta

Tropical storm (SSHWS)
Carlotta 2018-06-16 2001Z
 
Carlotta 2018 track
DurationJune 14 – June 18
Peak intensity65 mph (100 km/h) (1-min)  997 mbar (hPa)

A broad area of low pressure formed south of Mexico on June 12,[36] organizing into the season's fourth tropical depression by 21:00 UTC on June 14 and further into Tropical Storm Carlotta around 18:00 UTC on June 15.[37][38] Initial forecasts showed the storm only slightly intensifying before moving ashore the coastline of Mexico;[39] instead, Carlotta stalled just offshore and strengthened to attain peak winds of 65 mph (100 km/h) as it established an inner core and eye.[40] Interaction between the system's eyewall and land prompted a swift weakening trend as it paralleled the Mexican shoreline, and Carlotta fell to tropical depression intensity by 18:00 UTC on June 17, before degenerating to a remnant low at 00:00 UTC on June 19.[41][42]

Tropical Storm Daniel

Tropical storm (SSHWS)
Daniel 2018-06-24 1830Z
 
Daniel 2018 track
DurationJune 24 – June 26
Peak intensity45 mph (75 km/h) (1-min)  1004 mbar (hPa)

Late on June 21, the NHC began monitoring a surface trough and its associated disorganized convection several hundred miles southwest of Baja California. Environmental conditions were expected to be marginally conducive for development as it moved north-northwestward.[43] Convection began to show signs of organization early on June 23,[44] and this process led to the formation of a tropical depression by 03:00 UTC on the next morning, as spiral bands wrapped into the storm's well-defined center.[45] At 15:00 UTC on June 24, the depression was upgraded to a tropical storm and was assigned the name Daniel.[46] At 18:00 UTC on June 24, Tropical Storm Daniel reached peak intensity with sustained winds of 45 mph (75 km/h).[47] At 15:00 UTC on June 25, Daniel began to weaken as it moved over seas cooler than 25 °C (77 °F).[48] The system weakened to a tropical depression at 18:00 UTC that day.[49] At 15:00 UTC on June 26, Daniel degenerated into a remnant low, as it lost all convection and was reduced to a swirl of low-level clouds.[50] The remnants of Daniel dissipated completely on June 28.[51]

Tropical Storm Emilia

Tropical storm (SSHWS)
Emilia 2018-06-29 2100Z
 
Emilia 2018 track
DurationJune 27 – July 1
Peak intensity60 mph (95 km/h) (1-min)  997 mbar (hPa)

On June 23, the NHC noted the potential for tropical cyclogenesis from a tropical wave crossing over Costa Rica. Environmental conditions were expected to be conducive for development as it moved westward.[52] The system then steadily organized over warm waters, developing into Tropical Depression Six-E at 18:00 UTC June 27, about 480 miles (770 km) southwest of Manzanillo, Mexico.[53] It gradually strengthened into Tropical Storm Emilia at 12:00 UTC on June 28.[53] At 12:00 UTC on June 29, Emilia reached its peak intensity with maximum sustained winds of 60 mph (95 km/h); however, it was then subject to strong wind shear.[53] The shear took its toll on Emilia, and by 12:00 UTC the next day, it weakened into a tropical depression.[53] Finally, at 00:00 UTC on July 2, Emilia degenerated into a remnant low, as it lost its convection and was reduced to a swirl of clouds.[53]

Hurricane Fabio

Category 2 hurricane (SSHWS)
Fabio 2018-07-03 2050Z
 
Fabio 2018 track
DurationJune 30 – July 6
Peak intensity110 mph (175 km/h) (1-min)  964 mbar (hPa)

The NHC first noted the potential for tropical cyclogenesis from a tropical wave crossing over Honduras and Nicaragua at 18:00 UTC on June 24.[54] Subsequent development was expected of the system as it moved westward. It steadily organized over warm waters and transitioned into Tropical Depression Seven-E at 21:00 UTC June 30, 490 miles (790 km) southwest of Acapulco, Mexico.[55] The system gradually strengthened into Tropical Storm Fabio at 09:00 UTC on July 1.[56] With SSTs of 30 °C (86 °F) and almost no wind shear, Fabio began to intensify, quickly strengthening into a hurricane by 15:00 UTC on July 2.[57] Initially, forecasters at the NHC predicted that Fabio would intensify further and become a major hurricane, although it failed to do so and peaked with maximum sustained winds of 110 mph (175 km/h), just shy of major hurricane status.[58] Afterward, Fabio began to rapidly weaken as it moved over cooler waters. At 15:00 UTC on July 6, Fabio degenerated into a remnant low as it lost its convection while located 1,285 miles (2,065 km) off the coast of the Baja Peninsula.[59]

Tropical Storm Gilma

Tropical storm (SSHWS)
Gilma 2018-07-26 2135Z
 
Gilma 2018 track
DurationJuly 26 – July 29
Peak intensity45 mph (75 km/h) (1-min)  1005 mbar (hPa)

On July 18, the NHC forecast the development of an area of low pressure over the east Pacific Ocean within the next few days.[60] A weak area of low pressure developed several hundred miles south-southeast of the Gulf of Tehuantepec on July 22. Little development occurred over the next few days as the low moved northwestward across the Pacific Ocean. However, shower and thunderstorm activity associated with the low began to quickly organize on July 26, leading to the formation of a tropical depression at 12:00 UTC on July 26.[61] Six hours later, the depression strengthened into Tropical Storm Gilma.[61] However, northwesterly wind shear soon exposed the center of circulation, causing Gilma to weaken to a tropical depression at 18:00 UTC the following day.[61] At 12:00 UTC on July 29, the system degenerated into a remnant low shortly before entering the Central Pacific basin.[61]

Tropical Depression Nine-E

Tropical depression (SSHWS)
09E 2018-07-26 2230Z
 
Nine-E 2018 track
DurationJuly 26 – July 27
Peak intensity35 mph (55 km/h) (1-min)  1007 mbar (hPa)

The NHC began monitoring a disorganized area of low pressure in the deep tropical Pacific Ocean on July 24 for tropical cyclone development.[62] Gradual organization ensued as the low moved westward, and by July 26, it had organized sufficiently to be classified as a tropical depression.[63] The tropical depression failed to organize, however, and the center soon became difficult to locate on satellite imagery.[64] After having lasted less than a day as a tropical cyclone, the depression opened up into a trough, as it became embedded within the Intertropical Convergence Zone at 12:00 UTC on July 27.[65] Although Nine-E's remnants produced intermittent convection; high wind shear and dry air prevented it from regenerating back into a tropical cyclone, and the storm's remnants dissipated a few days later.[66]

Hurricane Hector

Category 4 hurricane (SSHWS)
Hector 2018-08-06 2255Z
 
Hector 2018 track
DurationJuly 31 – August 13 (Exited basin)
Peak intensity155 mph (250 km/h) (1-min)  936 mbar (hPa)

Late on July 26, the NHC noted the development of an area of low pressure that was forecast to form a couple hundred miles west-southwest of Mexico.[67] A broad area of low pressure formed several hundred miles south-southeast of Acapulco, Mexico, at 12:00 UTC on July 28.[68] The system gradually developed into a tropical depression at 21:00 UTC on July 31.[69] The depression quickly organized, developing a more defined center and spiral banding, and at 03:00 UTC on August 1, it strengthened into Tropical Storm Hector.[70] Hector further strengthened and became a hurricane at 14:00 UTC on August 2.[71] Afterward, the small hurricane rapidly strengthened, becoming a strong Category 2 hurricane just six hours later.[72] However, the eye became clouded and ill-defined shortly afterward, while the storm underwent an eyewall replacement cycle, and Hector's intensification halted momentarily, as northeasterly shear and dry air impinged on the system, weakening the system back to a Category 1 hurricane.[73] Yet, the hurricane quickly intensified yet again, and restrengthened back into a Category 2 hurricane, and later to a Category 3 hurricane, making it the third major hurricane of the season. A strong convective band soon wrapped into Hector's central dense overcast (CDO), strengthening it to a Category 4 major hurricane.[74] On the next morning, a shrinking CDO weakened Hector back into a Category 3 storm.[75] In the following hours, Hector underwent another eyewall replacement cycle and was set to weaken thereafter. After the completion of the eyewall replacement cycle, Hector rapidly intensified back to a high-end Category 4 storm on August 6. At 09:00 UTC on August 8, Hector weakened to a Category 3 hurricane. At 21:00 UTC, the CPHC reported that Hector was passing about 200 miles (320 km) south of the Big Island with winds of 115 mph. At the same time, Hector began a third eyewall replacement cycle. By 09:00 UTC on August 9, Hector completed the eyewall replacement cycle.[76]

By 15:00 UTC on the same day, Hector began to intensify once again, as it moved due west. At 21:00 UTC on August 10, Hector reached its secondary peak intensity with winds of 140 mph (220 km/h) as it began to turn west-northwest. On August 11, Hector began another weakening trend as increasing wind shear began to take a toll on the system. By this time, the hurricane set a record for the longest consecutive duration as a major hurricane in the northeastern Pacific. Late on August 11, Hector weakened below major hurricane strength due to increasing wind shear, a status it had held for nearly eight days. Hector weakened to Category 1 status on August 12. On August 13 at 15:00 UTC, Hector crossed the International Date Line as a tropical storm.[77]

Tropical Storm Ileana

Tropical storm (SSHWS)
Ileana 2018-08-05 1725Z
 
Ileana 2018 track
DurationAugust 4 – August 7
Peak intensity65 mph (100 km/h) (1-min)  998 mbar (hPa)

A tropical wave entered the eastern Pacific Ocean on August 3, where the NHC began to monitor the system for tropical development.[78] Although the system was initially disorganized, it rapidly organized over the next two days, and on August 4, the system developed into a tropical depression while located south of the Gulf of Tehuantepec.[79] The depression continued to organize that night through the next day, and at 21:00 UTC on August 5, the system strengthened into Tropical Storm Ileana.[80] After strengthening to peak winds of 65 mph (100 km/h), Ileana weakened as it began to feel the influence of the much larger Hurricane John, with the two systems experiencing the Fujiwhara effect. On August 7, the small circulation of Ileana dissipated, as the storm was absorbed by John.[81]

Heavy rain in Guerrero resulted in three deaths, while rip currents caused an additional fatality along the coast of Chilpancingo.[82]

Hurricane John

Category 2 hurricane (SSHWS)
John 2018-08-07 2030Z
 
John 2018 track
DurationAugust 5 – August 10
Peak intensity110 mph (175 km/h) (1-min)  964 mbar (hPa)

On July 29, the NHC began forecasting the development of an area of low pressure that was expected to form several hundred miles off the Mexican coast.[83] A broad area of low pressure formed several hundred miles south of the Gulf of Tehuantepec on August 2.[84] Gradual organization occurred as the low moved slowly west-northwestward, and at 21:00 UTC on August 5, the low had organized sufficiently to be classified as the season's twelfth tropical depression.[85] The depression quickly strengthened into Tropical Storm John six hours later.[86] Amid very favorable environmental conditions, John rapidly intensified, and by 21:00 UTC on August 6, John had become the fifth hurricane of the season, and soon began to interact with Tropical Storm Ileana to the east, due to the Fujiwhara effect.[87] On August 7, Hurricane John absorbed the smaller Tropical Storm Ileana, while continuing to strengthen.[81] At 15:00 UTC August 7, John reached peak intensity with winds of 105 mph (165 km/h).[88] However, John began to move over cooler waters and began to weaken. The cyclone weakened to a Category 1 hurricane by 15:00 UTC on August 8, and to tropical storm status by 09:00 UTC on August 9, until it finally degenerated into a remnant low at 15:00 UTC on August 10.[89]

Although John never made landfall, it produced high surf along the coastlines of Baja California and Southern California.[90]

Tropical Storm Kristy

Tropical storm (SSHWS)
Kristy 2018-08-10 1925Z
 
Kristy 2018 track
DurationAugust 7 – August 12
Peak intensity70 mph (110 km/h) (1-min)  991 mbar (hPa)

On August 2, an area of disturbed weather associated with a tropical wave formed south of Mexico,[91] the NHC began monitoring the disturbance for potential tropical development. The system lingered for days without developing as it tracked generally towards the west, finally at 05:00 UTC August 7, the well-defined low was embedded within a developing area of convection, along with tight banding near the center and was classified as Tropical Depression Thirteen-E accordingly.[92] The depression developed into Tropical Storm Kristy by 09:00 UTC the same day.[93] Kristy gradually strengthened over the next few days, and at 03:00 UTC on August 10, it attained its peak intensity with maximum sustained winds of 70 mph (110 km/h), just short of hurricane status.[94] However, as Kristy moved over progressively cooler waters, it gradually weakened. By 15:00 UTC August 11, Kristy degenerated into a remnant low as cooler waters and wind shear had taken its toll on Kristy's cloud structure which consisted of a swirl of low clouds with some mid and high-level clouds.[95] Despite degenerating into a remnant low, showers and thunderstorms redeveloped in association with Post-Tropical Cyclone Kristy by 00:00 UTC August 12 and the disturbance was monitored, however cold waters prevented the system from regenerating back into a tropical cyclone.[96]

Hurricane Lane

Category 5 hurricane (SSHWS)
Lane 2018-08-21 2350Z
 
Lane 2018 track
DurationAugust 15 – August 29
Peak intensity160 mph (260 km/h) (1-min)  922 mbar (hPa)

A tropical depression formed well southwest of Baja California around 03:00 UTC on August 15, from an area of disturbed weather the NHC had been monitoring for days.[97] Steered due west amid favorable environmental conditions, the system intensified into Tropical Storm Lane by 15:00 UTC on the next day,[98] and further strengthened to a hurricane around 03:00 UTC on August 17 as an eye became apparent.[99] Following the formation of an inner core, Lane began a period of rapid intensification that brought the system to its initial peak intensity as a Category 4 hurricane with winds of 140 mph and a pressure of 950 mb early on August 18.[100] It crossed into the Central Pacific thereafter, where strong westerly wind shear caused a substantial degradation in satellite presentation.[101] Upper-level winds gradually slackened, allowing Lane to regain Category 4 intensity late on August 20.[102] Despite forecasts calling for the storm to weaken, Lane continued to strengthen. By 04:30 UTC on August 22, data from a reconnaissance aircraft measured maximum 1-minute sustained winds near 160 mph (260 km/h), and Lane was upgraded to a Category 5 hurricane as it maintained a distinct eye surrounded by deep convection.[103][104][105] However, shear increased, weakening Lane to a Category 4 as it was guided towards Hawaii by a strengthening ridge.[106] Rapid weakening ensued thereafter, weakening Lane from a Category 2 to a tropical storm in 6 hours due to 35 to 40 knots of wind shear impacting Lane's core convection.[107] Early on August 26, Lane made the turn west that it had been predicted to make as it was embedded in the trade winds.[108] At 15:00 UTC August 26, Lane weakened into a tropical depression as its low level center was nearly entirely exposed.[109] However, at 15:00 UTC on August 27, Lane re-intensified into a tropical storm as a convective bursts partially covered the low level center.[110] However, this re-intensification would be short lived, as 18 hours later, Lane weakened back into a tropical depression, as its low-level circulation center was once again exposed, due to constant wind shear.[111] Finally, at 3:00 UTC on August 29, Lane degenerated into a remnant low, as its circulation became elongated and cloud tops near the center warmed and were displaced from the center.[112]

Hurricane Miriam

Category 2 hurricane (SSHWS)
Miriam 2018-08-31 2110Z
 
Miriam 2018 track
DurationAugust 26 – September 2
Peak intensity100 mph (155 km/h) (1-min)  974 mbar (hPa)

At 21:00 UTC on August 22, forecasters at the NHC forecasted that an area of low pressure could form several hundred miles southwest of the Baja California Sur.[113] Shortly afterward, on August 24, a trough of low pressure formed where the NHC predicted where it would be, predictions said that gradual development would be possible of the system.[114] Gradual development ensued and a tropical depression formed at 9:00 UTC on August 26.[115] At 15:00 UTC on the same day, the depression intensified into a tropical storm, where it was given the name Miriam.[116] The system gradually intensified and at 21:00 UTC on August 29, Miriam intensified into a hurricane.[117] At 0:00 UTC on August 30, Miriam entered the Central Pacific where responsibility was handed over to the CPHC. At 12:00 UTC on August 31, Miriam intensified to attain its peak intensity as a Category 2 hurricane.[118] Soon thereafter, Miriam began to be affected by wind shear, weakening into a Category 1 hurricane on August 31.[119][120] Late on September 2, Miriam degenerated into a remnant low, due to strong wind shear.

Hurricane Norman

Category 4 hurricane (SSHWS)
Norman 2018-08-30 2130Z
 
Norman 2018 track
DurationAugust 28 – September 10
Peak intensity150 mph (240 km/h) (1-min)  937 mbar (hPa)

Hurricane Norman originated from a broad area of low pressure that formed several hundred miles south-southwest of Acapulco, Mexico on August 25.[121] Traveling west-northwest,[122] the system coalesced into a tropical depression by at 15:00 UTC on August 28 while situated approximately 420 miles (675 km) south-southwest of the southern tip of Baja California.[123] A subtropical ridge steered the system west for several days.[124] Early on August 29, the depression intensified into a tropical storm and received the name Norman.[125] Favorable environmental conditions enabled quick intensification, and the system achieved hurricane strength early on August 30.[126] Rapid intensification ensued throughout the day, culminating with Norman attaining its peak intensity at 15:00 UTC, with sustained winds of 150 mph (240 km/h) and a central pressure of 937 mbar (27.67 inHg).[127][128][129] During a 24-hour period, the hurricane's winds increased by 80 mph (130 km/h), the largest such increase since Hurricane Patricia in 2015.[130]

The combination of an eyewall replacement cycle and increasing wind shear induced weakening beginning on August 31. At 03:00 UTC on August 31, Norman turned to the west-southwest due to a deep-layer ridge to the north.[131][132][133] Norman fell to Category 2 status for a period,[134] before unexpectedly rapidly intensifying back to a Category 4 hurricane on September 2. The storm attained a secondary peak with winds of 140 mph (235 km/h) and a pressure of 947 mbar (28.00 inHg).[135] Initially proving resilient to adverse conditions, Norman succumbed to increasing wind shear and lower sea surface temperatures on September 3. Its central dense overcast warmed and its eye filled.[136] At the same time, Norman took a turn to a more westerly direction.[137] On September 4, the hurricane crossed west of 140°W, and warning responsibility shifted to the Central Pacific Hurricane Center (CPHC).[138] On the next day, another bout of unexpected intensification ensued and Norman regained major hurricane status.[139] However, wind shear increased once again thereafter, and Norman weakened into a Category 1 hurricane on September 6. On September 7, Norman weakened further to a tropical storm as it began to lose its tropical characteristics. The CPHC issued its final advisory on Norman at 21:00 UTC on September 8, as it was rapidly becoming extratropical; Norman subsequently completed its extratropical transition on the next day.[140]

Hurricane Olivia

Category 4 hurricane (SSHWS)
Olivia 2018-09-06 2210Z
 
Olivia 2018 track
DurationSeptember 1 – September 13
Peak intensity130 mph (215 km/h) (1-min)  951 mbar (hPa)

Hurricane Olivia originated from a broad area of low pressure that formed several hundred miles southwest of Mexico on August 30.[141] The National Hurricane Center (NHC) continued to monitor the disturbance as it moved west-northwest for the next couple of days.[142] At 03:00 UTC on September 1, the NHC declared that a tropical depression had formed about 400 miles (645 km) southwest of Mexico.[143] Due to unfavorable conditions, the depression slowly became more organized over the next day and half before strengthening into Tropical Storm Olivia at 09:00 UTC on September 2.[144] At that time, wind shear from the north-northeast was continuing to prevent significant development of the system.[145] Over the next day and a half, Olivia changed little in strength before beginning a period of rapid intensification on September 3.[146][147] At 03:00 UTC on September 4, Olivia became a Category 1 hurricane.[148] Olivia continued to rapidly intensify, becoming a Category 2 hurricane twelve hours later.[149] At 21:00 UTC on September 4, Olivia became the sixth major hurricane of the season.[150] Six hours later, Olivia reached its initial peak intensity, with maximum sustained winds of 125 mph (205 km/h) and a minimum central pressure of 955 mbar (28.20 inHg).[151] Olivia then started weakening due to increasing wind shear and lower sea surface temperatures at 09:00 UTC on September 5. Olivia then weakened more and fell below major hurricane strength at 15:00 UTC on the same day.[152] Unexpectedly, Olivia intensified into a Category 4 hurricane with a new peak intensity of 130 mph (215 km/h) and a minimum central pressure of 948 mbar (28.00 inHg).[153] Olivia then headed into the Central Pacific Basin with maximum sustained winds of 85 mph (140 km/h).[154] As Olivia got closer to the Hawaiian Islands, tropical storm watches were issued for Oahu, Maui, Molokai, Lanai, Kahoolawe, and The Big Island.[155] At 21:00 UTC on September 12, Olivia made landfall in Northwest Maui and Lanai as a tropical storm.[156] Olivia weakened into a tropical depression as wind shear affected the storm on September 13.[157] Olivia then degenerated into a remnant low at 00:00 UTC on September 14 and dissipated on September 19, after crossing the International Date Line.[158]

Tropical Storm Paul

Tropical storm (SSHWS)
Paul 2018-09-09 2105Z
 
Paul 2018 track
DurationSeptember 8 – September 11
Peak intensity45 mph (75 km/h) (1-min)  1002 mbar (hPa)

A large area of disorganized thunderstorms and cloudiness formed several hundred miles off the southwest coast of Mexico on September 4.[159] The disturbance gradually organized as it moved slowly west-northwestward, and by 15:00 UTC on September 8, it had acquired sufficient organized convection to be classified as a tropical depression.[160] Although initial forecasts called for the depression to eventually strengthen into a hurricane, it remained a sheared tropical cyclone with its center of circulation exposed on the eastern side. At 09:00 UTC on September 9, the depression strengthened into Tropical Storm Paul.[161] Despite a moderately favorable environment, Paul failed to strengthen significantly and remained a poorly organized system, eventually weakening to a tropical depression early on September 11.[162] After lacking deep convection for over 12 hours, Paul degenerated into a remnant low at 00:00 UTC on September 12,[163] marking the first time since August 14 that no tropical cyclones were active in the northeastern Pacific.[164]

Tropical Depression Nineteen-E

Tropical depression (SSHWS)
19E 2018-09-19 1830Z
 
Nineteen-E 2018 track
DurationSeptember 19 – September 20
Peak intensity35 mph (55 km/h) (1-min)  1002 mbar (hPa)

At 0:00 UTC on September 11, forecasters at the NHC predicted that an area of low pressure would develop within a few days.[165] At 12:00 UTC on September 14, a broad area of disturbed weather had developed, as expected.[166] Some development followed, but the system began to approach the Baja California Peninsula, which was initially expected to cause the system to fail to develop due to land interaction.[167] Despite land interaction, the system continued to organize, and at 15:00 UTC on September 19, Tropical Depression Nineteen-E formed within an inverted trough in the Gulf of California, with the NHC initiating advisories on the system.[168] The storm dumped large amounts of rain on Baja California Sur and northwestern Mexico while it was still offshore.[169] The depression turned out to be short-lived, as the storm dissipated after making landfall in northwestern Mexico, early on September 20.[170]

Severe flooding affected much of Sinaloa and Sonora. Damage in the former state reached an estimated 800 million pesos (US$42.5 million).[171]

Hurricane Rosa

Category 4 hurricane (SSHWS)
Rosa 2018-09-28 0945Z
 
Rosa 2018 track
DurationSeptember 25 – October 2
Peak intensity150 mph (240 km/h) (1-min)  936 mbar (hPa)

At 18:00 UTC on September 19, the NHC forecasted an area of low pressure that would develop in a few days.[172] At 00:00 UTC on September 23, a broad area of disturbed weather formed where the NHC predicted.[173] Gradual development occurred and the system organized into a tropical depression at 09:00 UTC on September 25.[174] The depression then developed into a tropical storm and was given the name, Rosa, at 15:00 UTC on the same day.[175] Rosa gradually strengthened and at 03:00 UTC on September 26, Rosa intensified into a hurricane.[176] At 21:00 UTC on September 27, Rosa then rapidly intensified and became the seventh Category 4 hurricane of the season.[177] Late on September 28, Rosa started weakening due to an eyewall replacement cycle and rapidly lost structure, falling to Category 3 status.[178] Early on September 29, Rosa weakened below major hurricane status.[179] By the afternoon, Rosa started re-intensifying, with the eyewall replacement having been completed.[180] Late on September 29, Rosa started to weaken yet again, as it was impacted by high amounts of wind shear and low sea surface temperatures.[181] By September 30, Rosa had weakened to a tropical storm while approaching Baja California.[182] The storm quickly weakened into a remnant low on October 2, as it passed over the peninsula, before dissipating on the next day.[183]

Hurricane Sergio

Category 4 hurricane (SSHWS)
Sergio 2018-10-04 2040Z
 
Sergio 2018 track
DurationSeptember 29 – October 13
Peak intensity140 mph (220 km/h) (1-min)  942 mbar (hPa)

Late on September 25, the NHC forecasted an area of low pressure to develop within the Gulf of Tehuantepec, south of Mexico within a couple of days.[184] Early on September 26, an area of low pressure developed as expected, with the NHC initially giving the system a low chance of tropical development.[185] Over the next few days, the disturbance gradually organized while slowly moving westward, and on September 29, the disturbance organized into Tropical Storm Sergio, while situated south-southwest of Acapulco, Mexico.[186] As the system moved roughly to the west, Sergio quickly intensified, reaching Category 1 hurricane status early on October 1.[187] On October 2, Sergio intensified to a Category 2 hurricane,[188] before strengthening into a Category 3 major hurricane later that day.[189] Late on October 3, Sergio intensified into a Category 4 hurricane, becoming the record-breaking eighth hurricane in the East Pacific basin of Category 4 or 5 intensity.[190] Early on October 4, Sergio reached its peak intensity, with maximum sustained winds of 140 mph (220 km/h) and a minimum central pressure of 943 millibars (27.8 inHg).[191] Afterward, Sergio began to weaken, dropping to Category 3 intensity by 03:00 UTC on the next day.[192] Early on October 6, Sergio had restrengthened into a strong Category 3 hurricane, while continuing westward,[193] and the storm held that intensity for another day before a weakening trend resumed, weakening Sergio into a Category 2 hurricane early on October 7.[194] Sergio continued to weaken over cooler waters, and after stalling five days as a Category 1, it finally dropped to tropical storm strength late on October 9,[195] before making landfall on Baja California early on October 12.[196] Later on the same day, Sergio weakened into a tropical depression, after making a second landfall on the Mexican mainland.[197] Soon afterward, Sergio degenerated into a remnant low.[198]

Hurricane Walaka

Category 5 hurricane (SSHWS)
Walaka 2018-10-02 0054Z
 
Walaka 2018 track
DurationSeptember 29 – October 6
Peak intensity160 mph (260 km/h) (1-min)  920 mbar (hPa)

On September 29, a tropical disturbance to the southwest of Hawaii organized into Tropical Storm Walaka, becoming the first named storm in the Central Pacific basin since Hurricane Ulika in 2016.[199] Walaka organized into a hurricane on September 30 and began rapidly intensifying.[200] Within 24 hours, Walaka had intensified into a major hurricane.[201] Walaka continued to intensify, reaching Category 4 status at 8:00 HST (18:00 UTC) on October 1. Early on the next day, at 00:00 UTC, Walaka became the second Category 5 hurricane of the year east of the International Date Line.[202] Later on October 2, however, the hurricane underwent an eyewall replacement cycle that caused it to weaken while passing close to Johnston Atoll.[203] At 12:00 UTC on October 3, Walaka started to reintensify while moving away from Johnston Atoll and toward Papahānaumokuākea Marine National Monument. However, northwesterly wind shear began to adversely affect Walaka, causing it to weaken before crossing the archipelago.[204] Walaka continued to weaken over cooler waters further north.[205] At 15:00 UTC on October 6, Walaka transitioned into an extratropical cyclone 1,085 miles (1,740 km) north-northwest of Honolulu, Hawaii.[206] Unrelated to Walaka, Typhoon Kong-rey developed and intensified into a Category 5-equivalent super typhoon around the same time Walaka reached its peak intensity, marking the first time since 2005 when two tropical cyclones of Category 5 strength existed simultaneously in the Northern Hemisphere.[207]

Tropical Storm Tara

Tropical storm (SSHWS)
Tara 2018-10-15 1730Z
 
Tara 2018 track
DurationOctober 14 – October 17
Peak intensity65 mph (100 km/h) (1-min)  995 mbar (hPa)

Early on October 11, the NHC began monitoring a large area of disturbed weather that had developed near the Gulf of Tehuantepec for possible tropical cyclone development.[208] The disturbance gradually contracted and became better-defined as it moved west-northwestward paralleling the coast of Mexico. By 15:00 UTC on October 14, the low had finally acquired sufficiently organized convection to be classified as a tropical depression.[209] The depression then strengthened into Tropical Storm Tara at 09:00 UTC on October 15.[210] Amid favorable conditions, the tiny cyclone strengthened, reaching its peak intensity with maximum sustained winds of 65 mph (100 km/h).[211] However, a burst of moderate to strong southeasterly shear caused the low-level and upper-level circulations of the cyclone to decouple as it crawled slowly northwestward, and rapid weakening ensued as Tara neared the Mexican coast.[212] At 21:00 UTC on October 16, Tara weakened to a tropical depression while just south of Manzanillo, Mexico,[213] before degenerating into an elongated trough with no discernible circulation six hours later.[214]

Tropical Storm Vicente

Tropical storm (SSHWS)
Vicente 2018-10-19 1915Z
 
Vicente 2018 track
DurationOctober 19 – October 23
Peak intensity50 mph (85 km/h) (1-min)  1002 mbar (hPa)

On October 17, an elongated low-pressure system developed to the south of Guatemala. Although the system was given a high chance of tropical development, it remained disorganized while moving westward.[215] Early on October 19, a new trough of low pressure developed to the south of Guatemala, within the broad area of disturbed weather, east of the original low of the larger disturbance.[216] The new system quickly organized; consequently, and was designated as Tropical Depression Twenty-Three-E roughly 12 hours later on October 19.[217] Just six hours later, Twenty-Three-E strengthened into a tropical storm, receiving the name Vicente, and also it soon developed an eye, which did not last long whatsoever.[218] Thereafter, moderate northeasterly wind shear began to weaken the relatively small system.[219] A burst of mild restrengthening followed on the next day;[220] however, it was short-lived, and the storm resumed weakening six hours later.[221] At 15:00 UTC on October 23, Vicente degenerated into a remnant low shortly after making landfall in Michoacán, before dissipating shortly afterward.[222]

In Mexico, 16 people were killed, due to heavy rains and mudslides triggered by Vicente.[223][224][225]

Hurricane Willa

Category 5 hurricane (SSHWS)
Willa 2018-10-22 0850Z
 
Willa 2018 track
DurationOctober 20 – October 24
Peak intensity160 mph (260 km/h) (1-min)  925 mbar (hPa)

On October 14, the NHC began monitoring an Atlantic tropical wave that had developed an area of low pressure in the southwestern Caribbean Sea.[226] On the next day, the system became better organized southeast of the Yucatán Peninsula, and the storm encountered more favorable conditions as it neared land; a Hurricane Hunter aircraft was scheduled to survey the system for further development.[227] However, organization was hindered as the system quickly made landfall in Belize on the next day.[228] Early on October 17, the tropical wave moved into the East Pacific and quickly organized;[229] however, the system failed to coalesce into a tropical cyclone and became increasingly disorganized on the next day.[230] Early on October 19, a new low-pressure trough developed to the east of the original low,[216] which organized into Tropical Storm Vicente later that day.[218] The original low to the west gradually organized while moving westward, and early on October 20, the system developed into Tropical Depression Twenty-Four-E while situated off the coast of southwestern Mexico.[231] Several hours later, the system strengthened into a tropical storm and was given the name Willa.[232] Early on October 21, Willa underwent rapid intensification and became a Category 1 hurricane.[233] Further rapid intensification ensued and Willa became a Category 3 hurricane at 21:00 UTC, just twelve hours after reaching hurricane status, becoming the tenth major hurricane of the season.[234] Soon afterward, at 22:30 UTC, Willa intensified further into a Category 4 hurricane, becoming the ninth of the year in the East Pacific.[15] At 6:00 UTC on October 22, Willa reached its peak intensity as the third Category 5 hurricane of the year, though operationally, Willa was assessed as reaching its peak at 15:00 UTC.[16] Soon after reaching peak intensity, Willa began to weaken, due to the commencement of an eyewall replacement cycle, weakening to a high-end Category 4 hurricane six hours later.[235] Willa encountered wind shear and weakened further into a Category 3 hurricane by the next day,[236] before making landfall at Category 3 intensity at 1:00 UTC on October 24 (7:00 pm on October 23, local time), in Sinaloa, southwestern Mexico.[237] Following landfall, Willa rapidly weakened, dissipating on October 24 over northeastern Mexico.[238]

In Nayarit state, Willa killed four people – three drowned along the San Pedro River, and the other was discovered by fishermen.[239] Heavy rainfall killed two people in Nogales, Sonora. There, floods swept away cars and entered homes and businesses.[240]

Tropical Storm Xavier

Tropical storm (SSHWS)
Xavier 2018-11-04 2050Z
 
Xavier 2018 track
DurationNovember 2 – November 5
Peak intensity65 mph (100 km/h) (1-min)  995 mbar (hPa)

Xavier originated from a trough of low pressure that the NHC began tracking on October 25.[241] The NHC tracked the disturbance for the next several days as it slowly organized and turned from a more westerly direction to the northwest.[242] However, the disturbance became less organized on October 30.[243] Over the next several days, the NHC continued to track the disturbance as it re-organized and turned towards the northeast.[244] At 21:00 UTC on November 2, the system organized into a tropical depression a few hundred miles southwest of Manzanillo, Mexico,[245] which subsequently strengthened into Tropical Storm Xavier at 03:00 UTC on November 3.[246] This made Xavier the first storm to reach the "X" name on the Eastern Pacific naming list since 1992.[247] Throughout its lifespan, Xavier was buffeted by high wind shear, which prevented the system from strengthening.[248][249] The system became sheared of all convection late on November 5,[250] and degenerated into a post-tropical cyclone early on November 6.[251]

Xavier brought tropical-storm-force winds and heavy rains to the coast of western Mexico.[252]

Other systems

96C 2018-09-02 0115Z
Invest 96C at peak intensity, as a subtropical storm, on September 2.

On August 29, an upper-level low absorbed the remnants of Hurricane Lane to the west-northwest of Hawaii.[253] The storm was assigned the designation 96C by the United States Naval Research Laboratory (NRL).[254] Traversing an area with sea surface temperatures 2 °C (3.6 °F) above-normal,[255] the system coalesced into a subtropical storm by August 31.[253] On September 2, the system reached its peak intensity and began to display an eye.[254] Afterward, the system gradually began to weaken, while accelerating northward into colder waters. On September 3, the system weakened below tropical depression intensity, back into an extratropical low. On September 4, the system was absorbed by a larger extratropical storm in the Bering Sea.[254]

Storm names

The following list of names was used for named storms that form in the northeastern Pacific Ocean during 2018. No names were retired, so this list will be used again in the 2024 season.[256] This is the same list used in the 2012 season. The name Vicente was used for the first time this year, while the names Willa and Xavier were both used once in 1962 and 1992, respectively.

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.[257] The next four names that were slated for use in 2018 are shown below; however, only the name Walaka was used.

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

Season effects

This is a table of all the storms that have formed in the 2018 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 2018 USD.

Saffir–Simpson scale
TD TS C1 C2 C3 C4 C5
2018 Pacific hurricane season statistics
Storm
name
Dates active Storm category

at peak intensity

Max 1-min
wind
mph (km/h)
Min.
press.
(mbar)
Areas affected Damage
(USD)
Deaths Refs
One-E May 10 – 11 Tropical depression 35 (55) 1007 None None None
Aletta June 6 – 11 Category 4 hurricane 140 (220) 943 None None None
Bud June 9 – 16 Category 4 hurricane 140 (220) 943 Western Mexico, Baja California Sur, Southwestern United States Minimal 1
Carlotta June 14 – 18 Tropical storm 65 (100) 997 Southwestern Mexico Unknown (2)
Daniel June 24 – 26 Tropical storm 45 (75) 1004 None None None
Emilia June 27 – July 1 Tropical storm 60 (95) 997 None None None
Fabio June 30 – July 6 Category 2 hurricane 110 (175) 964 None None None
Gilma July 26 – 29 Tropical storm 45 (75) 1005 None None None
Nine-E July 26 – 27 Tropical depression 35 (55) 1007 None None None
Hector July 31 – August 13[nb 2] Category 4 hurricane 155 (250) 936 Hawaii, Johnston Atoll Minimal None
Ileana August 4 – 7 Tropical storm 65 (100) 998 Western Mexico, Baja California Sur $737,000 8
John August 5 – 10 Category 2 hurricane 110 (175) 964 Western Mexico, Baja California Sur, Southern California None None
Kristy August 7 – 12 Tropical storm 70 (110) 991 None None None
Lane August 15 – 29 Category 5 hurricane 160 (260) 922 Hawaii $250 million 1
Miriam August 26 – September 2 Category 2 hurricane 100 (155) 974 None None None
Norman August 28 – September 10 Category 4 hurricane 150 (240) 937 Hawaii None None
Olivia September 1 – 13 Category 4 hurricane 130 (215) 951 Hawaii $25 million None
Paul September 8 – 11 Tropical storm 45 (75) 1002 None None None
Nineteen-E September 19 – 20 Tropical depression 35 (55) 1002 Baja California Sur, Northwestern Mexico >$296 million 12 (2)
Rosa September 25 – October 2 Category 4 hurricane 150 (240) 936 Baja California Peninsula, Northwestern Mexico, Southwestern United States $50.5 million 3
Sergio September 29 – October 13 Category 4 hurricane 140 (220) 943 Baja California Peninsula, Northwestern Mexico, Southwestern United States, Texas $402 million 1
Walaka September 29 – October 6 Category 5 hurricane 160 (260) 920 Johnston Atoll, Northwestern Hawaiian Islands, Alaska, British Columbia Minimal None
Tara October 14 – 17 Tropical storm 65 (100) 995 Southwestern Mexico Minimal None
Vicente October 19 – 23 Tropical storm 50 (85) 1002 Honduras, El Salvador, Guatemala, Southwestern Mexico $7.05 million 16
Willa October 20 – 24 Category 5 hurricane 160 (260) 925 Central America, Mexico, Texas $537 million 6
Xavier November 2 – 5 Tropical storm 65 (100) 995 Southwestern Mexico None None
Season Aggregates
26 systems May 10 – November 5   160 (260) 920 >$1.57 billion 47 (2)  

See also

Notes

  1. ^ The totals represent the sum of the squares for every (sub)tropical storm's intensity of over 33 knots (38 mph, 61 km/h), divided by 10,000. Calculations are provided at Talk:2018 Pacific hurricane season/ACE calcs.
  2. ^ Hector did not dissipate on August 13. It crossed the International Date Line, beyond which point it was then referred to as Tropical Storm Hector. It dissipated on August 16.

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1979 Pacific hurricane season

The 1979 Pacific hurricane season was an inactive Pacific hurricane season. It officially started on May 15, 1979, in the eastern Pacific, and June 1, 1979, in the central Pacific, and lasted until November 30, 1979. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeast Pacific Ocean.

With ten storms, less than two-thirds of the average of seventeen, this season was very inactive. There were six hurricanes, also below average. Of those hurricanes, four were major by reaching Category 3 or higher on the Saffir-Simpson Hurricane Scale. As of the 2018 Pacific hurricane season, 1979 remains the most recent year without any tropical cyclones active in the Central Pacific.

2006 Central Pacific cyclone

The 2006 Central Pacific cyclone, also known as Invest 91C or Storm 91C, was an unusual weather system that formed in 2006. Forming on October 30 from a mid-latitude cyclone in the north Pacific mid-latitudes, it moved over waters warmer than normal. The system acquired some features more typical of subtropical and even tropical cyclones. However, as it neared western North America, the system fell apart, dissipating soon after landfall, on November 4. Moisture from the storm's remnants caused substantial rainfall in British Columbia and the Pacific Northwest. The exact status and nature of this weather event is unknown, with meteorologists and weather agencies having differing opinions.

2018 North Indian Ocean cyclone season

The 2018 North Indian Ocean cyclone season was the most active North Indian Ocean cyclone season since 1992, with the formation of fourteen depressions and seven cyclones. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with the two peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.

The scope of this article is limited to the Indian Ocean in the Northern Hemisphere, east of the Horn of Africa and west of the Malay Peninsula. There are two main seas in the North Indian Ocean — the Arabian Sea to the west of the Indian subcontinent, abbreviated ARB by the India Meteorological Department (IMD); and the Bay of Bengal to the east, abbreviated BOB by the IMD.

The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center (JTWC) and the National Meteorological Center of CMA (NMC) unofficially release full advisories. On average, three to four cyclonic storms form in this basin every season.

2018 hurricane season

2018 hurricane season may refer to any of the following tropical cyclone seasons

2018 Atlantic hurricane season

2018 Pacific hurricane season

2018 Pacific typhoon season

2018 North Indian Ocean cyclone season

2017-18 South-West Indian Ocean cyclone season

2018-19 South-West Indian Ocean cyclone season

2017-18 Australian region cyclone season

2017-18 Australian region cyclone season

2017-18 South Pacific cyclone season

2018-19 South Pacific cyclone season

East Island, Hawaii

East Island was an island, formerly about 11-acre (4.5 ha)s in area, half a mile (800 m) long and 400 feet (120 m) wide. It was the second-largest in the French Frigate Shoals, and one of the Northwestern Hawaiian Islands, approximately 550 miles (890 km) northwest of Honolulu. It was largely washed away in 2018 by the storm surge from Hurricane Walaka. The remaining portion of the island above sea level consists of a sandy strip approximately 150 feet long.

The island, a sand and gravel spit that formed part of the Papahānaumokuākea Marine National Monument, was a habitat for Hawaiian monk seals and green sea turtles, both of which are endangered species. 96% of Hawaii's green sea turtles nest in the French Frigate Shoals, and over half of those were on East Island. Charles Littnan, of the National Oceanic and Atmospheric Administration, described the island as "the most important single islet for [green] sea turtle nesting".From November 1944 to October 1952 the U.S. Coast Guard maintained a LORAN radio navigation station on the island. In April 1946 it was badly damaged by a tsunami, and in August 1950 it had to be evacuated due to a typhoon warning.

Hurricane Bud (2018)

Hurricane Bud was a powerful tropical cyclone that produced heavy rainfall and flash flooding across Northwestern Mexico and the Southwestern United States. The second named storm and major hurricane of the 2018 Pacific hurricane season, Bud originated from a tropical wave that departed from Africa on May 29. It then travelled across the Atlantic Ocean before crossing over South America and entering the Northeast Pacific Ocean late on June 6. The system then moved northwest and steadily organized, becoming a tropical depression late on June 9 and Tropical Storm Bud early the next day. Favorable upper-level winds and ample moisture allowed the storm to rapidly intensify to a hurricane late on June 10 and further to a major hurricane on June 11. Bud ultimately peaked the next morning with maximum sustained winds of 140 mph (220 km/h) and a minimum barometric pressure of 943 mbar (hPa; 27.85 inHg). 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.

Bud prompted the issuance of multiple watches and warnings for Baja California Sur and Western Mexico. Additionally, Bud caused one death in Mexico City. Damages from the storm were reported to be minimal. Rains from Bud brought relief to drought-stricken areas and slowed the growth of wildfires in the Southwestern United States.

Hurricane Hector (2018)

Hurricane Hector was a powerful and long-lived tropical cyclone that was the first to traverse all three North Pacific basins since Genevieve in 2014. The eighth named storm, fourth hurricane, and third major hurricane of the 2018 Pacific hurricane season, Hector originated from an area of low pressure that formed a couple hundred miles west-southwest of Mexico on July 28. Amid favorable weather conditions, a tropical depression formed a few days later on July 31. The depression continued strengthening and became Tropical Storm Hector on the next day. Hector became a hurricane on August 2, and rapidly intensified into a strong Category 2 hurricane later in the day. After weakening while undergoing an eyewall replacement cycle, Hector quickly strengthened into a Category 4 hurricane late on August 5. Over the next week, Hector fluctuated in intensity multiple times due to eyewall replacement cycles and shifting wind shear. Hector achieved its peak intensity on August 6, as a high-end Category 4 hurricane with winds of 155 mph (250 km/h). On the following day, the hurricane bypassed Hawaii approximately 200 mi (320 km) to the south. Increasing wind shear resulted in steady weakening of the storm, beginning on August 11. At that time, Hector accumulated the longest continuous stretch of time as a major hurricane in the northeastern Pacific since reliable records began. Eroding convection and dissipation of its eye marked its degradation to a tropical storm on August 13. The storm subsequently traversed the International Dateline that day. Hector later weakened into a tropical depression on August 15, before dissipating late on August 16.

Hector prompted several islands in the Papahānaumokuākea Marine National Monument to issue tropical storm watches after the close pass by in Hawaii that warranted the issuance of a tropical storm warning for Hawaii County. Despite Hector having passed a couple hundred miles to the south of Hawaii, it still brought numerous adverse weather effects to Hawaii County and the surrounding islands.

Hurricane Lane (2018)

Hurricane Lane was the wettest tropical cyclone on record in Hawaii, with rainfall accumulations of 52.02 inches (1,321 mm) in Mountain View. It also ranked as the second-wettest tropical cyclone in the United States, after Hurricane Harvey of 2017. The first Category 5 Pacific hurricane since Patricia in 2015, Lane was the twelfth named storm, sixth hurricane, and fourth major hurricane of the 2018 Pacific hurricane season. It originated from a tropical wave that moved off the coast of Africa on July 31, and was eventually monitored for tropical cyclogenesis several hundred miles off the southern coast of Mexico on August 11. Over the next four days, the disturbance gradually strengthened amid favorable atmospheric and thermodynamic conditions and became a tropical storm on August 15. Steady intensification occurred and Lane reached hurricane status by August 17, followed by rapid intensification that brought Lane to its initial peak intensity as a Category 4 hurricane on August 18. On August 19, Lane crossed into the Central Pacific basin, where increased wind shear weakened it. However, on August 20, Lane re-intensified into a Category 4 hurricane, and reached its peak intensity as a Category 5 hurricane early on August 22. As Lane approached the Hawaiian Islands, it began to weaken as vertical wind shear once again increased, dropping below hurricane status on August 25. Over the next few days, Lane followed a westwards course away from the Hawaiian Islands as influence from the easterly trade winds increased as Lane weakened. On August 29, Lane became a remnant low, and dissipated shortly afterward.

Hurricane Lane was only the second Category 5 hurricane to pass within 350 miles (560 km) of South Point, Hawaii. The other one was John in 1994. Lane prompted the issuance of hurricane watches and warnings for every island in Hawaii. From August 22 to 26, Lane brought heavy rain to much of the Hawaiian Windward Islands, which caused flash flooding and mudslides. Strong winds downed trees and power lines on Maui, and brush fires ignited on both Maui and Oahu. One fatality occurred on Kauai, and damage across the state reached $250 million (2018 USD).

Hurricane Olivia (2018)

Hurricane Olivia was the first tropical cyclone to make landfall on Maui and Lanai in recorded history. The fifteenth named storm, ninth hurricane, and sixth major hurricane of the 2018 Pacific hurricane season, Olivia formed southwest of Mexico on September 1. The depression slowly organized and strengthened into Tropical Storm Olivia on the next day. Olivia then began a period of rapid intensification on September 3, reaching its initial peak on September 5. Soon after, Olivia began a weakening trend, before re-intensifying on September 6. On the next day, Olivia peaked as a Category 4 hurricane, with winds of 130 mph (215 km/h) and a minimum central pressure of 951 mbar (28.08 inHg). 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.

Hurricane Rosa (2018)

Hurricane Rosa was the first tropical cyclone to make landfall in the Mexican state of Baja California since Nora in 1997. The seventeenth named storm, tenth hurricane, and seventh major hurricane of the 2018 Pacific hurricane season, Rosa originated from a broad area of low pressure that the National Hurricane Center began monitoring on September 22. The disturbance moved westward and then west-northwestward for a few days, before developing into a tropical depression on September 25. Later that day, the depression strengthened into Tropical Storm Rosa. One day later, Rosa became a hurricane. On September 27, Rosa began a period of rapid intensification, ultimately peaking as a Category 4 hurricane with maximum sustained winds of 150 mph (240 km/h) and a minimum central pressure of 936 mbar (27.64 inHg) on the next day. Over the next couple of days, Rosa turned towards the northeast. By September 29, Rosa had weakened into a Category 2 hurricane due to ongoing structural changes and less favorable conditions. Later on the same day, Rosa re-intensified slightly. On September 30, Rosa resumed weakening as its core structure eroded. Early on October 1, Rosa weakened into a tropical storm. On October 2, Rosa weakened to a tropical depression and made landfall in Baja California. Later in the day, Rosa's remnants crossed into the Gulf of California, with its surface and mid-level remnants later separating entirely. The mid-level remnants of Rosa continued to travel north, reaching northeast Arizona late in the day. On October 3, Rosa's remnants were absorbed into an upper-level low situated off the coast of California.

Rosa prompted the issuance of tropical storm watches and warnings along the coast of Baja California as well as various flood related watches and warnings throughout the Southwestern United States. Rainfall from Rosa affected a large geographical area, due to the remnants having split apart in the Gulf of California. Rosa caused significant flooding throughout northwestern Mexico, which has resulted in the deaths of one person. Rosa also caused flash-flooding in Arizona, with several inches of rain falling in areas, which indirectly resulted in the deaths of two individuals. Additionally, remnant moisture from Rosa led to rainfall throughout the Southwestern United States. Flood damage from Rosa totaled about US$50.5 million.

Hurricane Sergio (2018)

Hurricane Sergio was a powerful and long-lived tropical cyclone that affected the Baja California Peninsula as a tropical storm. Sergio became the eighth Category 4 hurricane in the East Pacific for 2018, breaking the old record of seven which was set in 2015. The twentieth named storm, eleventh hurricane, and ninth major hurricane of the season, Sergio originated from a broad area of low pressure that formed a few hundred miles south-southeast of the southern coast of Mexico on September 26. The National Hurricane Center monitored the disturbance for a few days until it organized into a tropical storm, after which it was assigned the name Sergio. The system gradually strengthened for the next couple of days, becoming a hurricane on October 2. Sergio then began a period of rapid intensification, becoming a major hurricane later that day. Intensification then halted for about twelve hours before resuming on October 3. The next day, Sergio peaked as a Category 4 hurricane with maximum sustained winds of 140 mph (220 km/h) and a minimum central pressure of 942 mbar (27.82 inHg). Sergio maintained peak intensity for six hours before beginning to weaken. On October 5, the system bottomed out as a low-end Category 3 hurricane. Sergio then began another period of intensification, achieving a secondary peak on October 6. The next day, Sergio began to weaken again, falling below major hurricane strength. At the same time, Sergio unexpectedly assumed the structure of an annular tropical cyclone. By October 9, Sergio had weakened into a tropical storm. On October 12, Sergio made landfall as a tropical storm on the Baja California Peninsula, and later in northwestern Mexico as a tropical depression before dissipating early on October 13.

On October 10, Sergio's approach warranted the issuance of tropical storm watches and warnings along the western and eastern coasts of Baja California. Sergio made landfall in western Baja California Sur and Sonora on October 13 as a weak tropical storm, causing over US$2 million in damages, over a thousand school closures, and a few hundred evacuations due to severe flooding. The remnants of Sergio also brought heavy rainfall to Arizona, resulting in the closure of its state fair. Throughout Mexico and Arizona, no injuries or deaths were reported. Heavy rainfall also occurred in Texas, resulting in around US$400 million in damage and one death. Multiple tornadoes also spawned as a result of the increased moisture.

Hurricane Walaka

Hurricane Walaka ( ua-la-ka; Hawaiian: ʻwalaka meaning "ruler of the army") was one of the most intense Pacific hurricanes on record. By minimum pressure, Walaka is the second-strongest tropical cyclone in central Pacific, alongside Hurricane Gilma in 1994, and is only surpassed by Hurricane Ioke in 2006. The nineteenth named storm, twelfth hurricane, eighth major hurricane, and second Category 5 hurricane of the 2018 Pacific hurricane season, Walaka originated from an area of low pressure that formed over a thousand miles south-southeast of Hawaii on September 25. The National Hurricane Center tracked the disturbance for another day or so before it moved into the Central Pacific Basin. The Central Pacific Hurricane Center monitored the disturbance from that time until September 29, when the system organized into Tropical Storm Walaka. Walaka gradually strengthened, becoming a hurricane on October 1. Walaka then began to rapidly intensify, reaching Category 5 intensity by early on October 2. An eyewall replacement cycle caused some weakening of the hurricane, though it remained a powerful storm for the next day or so. Afterward, less favorable conditions caused a steady weakening of the hurricane, and Walaka became extratropical on October 6, well to the north of the Hawaiian Islands.

Although the hurricane did not impact any major landmasses, it passed very close to the unpopulated Johnston Atoll as a strong Category 4 hurricane, where a hurricane warning was issued in advance of the storm. Four scientists there intended to ride out the storm on the island, but were then evacuated before the storm hit. Walaka then neared the far Northwestern Hawaiian Islands, but weakened considerably as it did so. East Island in the French Frigate Shoals suffered a direct hit and was completely destroyed.

Hurricane Willa

Hurricane Willa was the strongest tropical cyclone to make landfall in the Mexican state of Sinaloa since Lane in 2006. The twenty-second named storm, thirteenth hurricane, tenth major hurricane, and record-tying third Category 5 hurricane of the 2018 Pacific hurricane season, Willa originated from a tropical wave that the National Hurricane Center (NHC) first began monitoring for tropical cyclogenesis in the southwestern Caribbean Sea, on October 14. The system subsequently crossed over Central America into the East Pacific, without significant organization. The NHC continued to track the disturbance until it developed into a tropical depression on October 20, off the coast of southwestern Mexico. Later in the day, the system became a tropical storm as it began to rapidly intensify. On October 21, Willa became a Category 4 major hurricane, before strengthening further to Category 5 intensity on the next day. Afterward, a combination of an eyewall replacement cycle and increasing wind shear weakened the hurricane, and early on October 24, Willa made landfall as a marginal Category 3 hurricane, in Sinaloa of the northwestern Mexico. Following landfall, Willa rapidly weakened, dissipating later on the same day over northeastern Mexico.

Up to its landfall, Willa prompted the issuance of hurricane and tropical storm watches and warnings for western Mexico. The hurricane killed six people, and caused $536.8 million (2018 USD) in damages, mostly around the area where it moved ashore, becoming the sixth-costliest Pacific hurricane on record.

Timeline of the 2018 Pacific hurricane season

The 2018 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 began 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.Four time zones are utilized in the basin: Central for storms east of 106°W, Mountain between 114.9°W and 106°W, Pacific between 140°W and 115°W, and Hawaii–Aleutian for storms between the International Date Line and 140°W. However, for convenience, all information is listed by Coordinated Universal Time (UTC) first with the respective local time included in parentheses. This timeline includes information that was not operationally released, meaning that data from post-storm reviews by the National Hurricane Center is included. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season.

Tropical Depression Nineteen-E (2018)

Tropical Depression Nineteen-E was a weak and short-lived tropical cyclone that caused flooding throughout Northwestern Mexico and several states within the United States. Nineteen-E originated from a tropical wave that left the west coast of Africa on August 29 to 30, 2018. It continued westward, crossed over Central America, and entered the northeastern Pacific Ocean by September 7. It then meandered to the southwest of Mexico for the next several days as it interacted with a mid-to-upper level trough. The National Hurricane Center (NHC) continued to track the disturbance for the next several days as it traveled northward. A surface trough developed over the Baja California peninsula on September 18. Despite disorganization and having close proximity to land, the disturbance developed into a tropical depression in the Gulf of California on September 19, after having developed a circulation center and more concentrated convection. The system peaked with maximum sustained winds of 35 mph (55 km/h) and a minimum central pressure of 1002 mbar (29.59 inHg).

One day after forming, the depression quickly deteriorated and dissipated after making landfall in Sonora. Overall, the depression affected eleven Mexican states, with torrential rainfall and flooding ensuing in Baja California Sur, Sinaloa, and Sonora. Thirteen individuals were killed in Chihuahua, Sinaloa, and Sonora, and over $40 million USD in agricultural losses were recorded. Excessive rainfall led to the inundation of at least 300,000 structures in Sinaloa. Flood damage there is estimated to be in the hundreds of millions (USD). Remnant moisture from Nineteen-E led to severe flooding within the U.S. states of Arizona, Texas, Oklahoma, and Arkansas and the death of one person. Damage estimates totaled about $250 million (USD) in the aforementioned states. Minor damage was also reported in New Mexico.

Tropical Storm Carlotta (2018)

Tropical Storm Carlotta was a tropical cyclone that caused flooding within several states in southwestern and central Mexico. Carlotta formed as the result of a breakdown in the Intertropical Convergence Zone to the south of Mexico. On June 12, a broad area of low pressure formed several hundred miles south of the aforementioned country and strengthened into a tropical storm by June 15. On the next day, the storm unexpectedly stalled within a favorable environment, which led to more intensification than originally anticipated. Early on June 17, Carlotta reached peak intensity with maximum sustained winds of 65 mph (100 km/h) and a minimum central pressure of 997 mbar (29.44 inHg) while located only 30 mi (50 km) south-southeast of Acapulco. Soon after, Carlotta began to interact with land and experience wind shear, which resulted in the system weakening to tropical depression status later in the day. The storm weakened to a remnant low early on June 19 and dissipated several hours later.

Carlotta prompted the issuance of multiple watches and warnings for the southern coast of Mexico. The storm caused a total of three deaths; two in Aguascalientes and one in Oaxaca. Additionally, the storm caused flooding and landslides throughout the states of Aguascalientes, Guerrero, Michoacán, Oaxaca, and Puebla, as well as the Yucatán Peninsula. Damage from the system was reported to be minor.

Tropical Storm Ileana (2018)

Tropical Storm Ileana was a tropical cyclone that affected Western Mexico, causing multiple deaths and flooding. The ninth named storm of the 2018 Pacific hurricane season, Ileana originated from a tropical wave that the National Hurricane Center began monitoring on July 26 as it left the west coast of Africa. The wave travelled across the Atlantic Ocean with no thunderstorm activity, before crossing into the Eastern Pacific Ocean on August 4. The disturbance quickly and unexpectedly organized into a tropical depression later in the day. Initially, the depression was well defined, but it soon degraded due to unfavorable conditions. It began to strengthen on August 5, becoming Tropical Storm Ileana. On August 6, Ileana peaked with winds of 65 mph (100 km/h) and a pressure of 998 mbar (29.47 inHg). Ileana began to develop an eyewall structure soon after, but became intertwined with nearby Hurricane John. John disrupted Ileana and ultimately absorbed it on August 7.

Ileana prompted the issuance of multiple watches and warnings along the coast of Baja California Sur and Western Mexico. Ileana caused a total of four deaths in Guerrero, with two occurring in Chilpancingo and the remainder in Acapulco. Additionally, Ileana caused flooding in the Mexican states of Oaxaca, Guerrero, and Mexico.

Tropical Storm Vicente (2018)

Tropical Storm Vicente was a weak and small tropical cyclone affected the southwestern Mexico in late October 2018, causing deadly flooding and mudslides. The twenty-first named storm of the 2018 Pacific hurricane season, Vicente originated from a trough of low pressure that formed within a large area of disturbed weather near Central America early on October 19. Around midday, the disturbance organized into a tropical depression, which prompted the National Hurricane Center to begin issuing advisories. Later in day, the depression strengthened into a tropical storm and was assigned the name Vicente. Despite having only been a weak tropical storm, Vicente developed an intermittent eye-like feature. Unfavorable conditions prevented strengthening until late on October 20. At that time, Vicente peaked with maximum sustained winds of 50 mph (85 km/h) and a minimum central pressure of 1002 mbar (29.59 inHg). A day later, Vicente began to weaken due increasing wind shear before slightly restrengthening early on October 22. On October 23, Vicente weakened into a tropical depression. Later in the day, Vicente degenerated into a remnant low after making landfall in southwestern Mexico, before dissipating soon afterward.

Vicente brought heavy rains in Mexico, which caused flooding and mudslides and killed 16 individuals.

Tropical cyclones in 2018

Tropical cyclones in 2018 were spread out across seven different areas called basins; two strongest of these tropical cyclones were typhoons Kong-rey and Yutu, both strengthened to a minimum barometric pressure of 900 mbar (hPa; 26.43 inHg). 150 tropical cyclones had formed this year to date. 101 tropical cyclones had been named by either a Regional Specialized Meteorological Center (RSMC) or a Tropical Cyclone Warning Center (TCWC). The most active basin in the year was the Western Pacific, which documented 28 named systems, while the Eastern Pacific, despite only amounting to 23 named systems, including on unnamed subtropical cyclone, was its basin's hyperactive and produced the highest Accumulated cyclone energy (ACE) in only season since 1992. Conversely, both the North Atlantic hurricane and North Indian Ocean cyclone seasons experienced the average number of cyclones reaching tropical storm intensity in recorded history, numbering 15 and 7, respectively. Activity across the southern hemisphere's three basins—South-West Indian, Australian, and South Pacific—was spread evenly, with each region recording seven named storms apiece.

The highest accumulated cyclone energy (ACE) from a single tropical cyclone this year was Hurricane Hector in the East Pacific in a total index of 50.5375 units. The costliest tropical cyclone of the year was Hurricane Michael in the Atlantic which struck Florida in October causing US$25.1 billion in damage. The deadliest tropical cyclone of the year was Tropical Storm Son-Tinh in the West Pacific which killed 170 people in Vietnam and Laos.

Tropical cyclone activity in each basin is under the authority of an RSMC. The National Hurricane Center (NHC) is responsible for tropical cyclones in the North Atlantic and East Pacific. The Central Pacific Hurricane Center (CPHC) is responsible for tropical cyclones in the Central Pacific. Both the NHC and CPHC are subdivisions of the National Weather Service. Activity in the West Pacific is monitored by the Japan Meteorological Agency (JMA). Systems in the North Indian Ocean are monitored by the Indian Meteorological Department (IMD). The Météo-France located in Réunion (MFR) monitors tropical activity in the South-West Indian Ocean. The Australian region is monitored by five TCWCs that are under the coordination of the Australian Bureau of Meteorology (BOM). Similarly, the South Pacific is monitored by both the Fiji Meteorological Service (FMS) and the Meteorological Service of New Zealand Limited. Other, unofficial agencies that provide additional guidance in tropical cyclone monitoring include the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) and the Joint Typhoon Warning Center (JTWC).

Most intense Pacific hurricane seasons
Tropical cyclones of the 2018 Pacific hurricane season

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