2015 Pacific hurricane season

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2015 Pacific hurricane season
2015 Pacific hurricane season summary map.png
Season summary map
Seasonal boundaries
First system formedMay 28, 2015
Last system dissipatedDecember 31, 2015
(record latest)
Strongest storm
NamePatricia
(Most intense hurricane in the Western Hemisphere)
 • Maximum winds215 mph (345 km/h)
(1-minute sustained)
 • Lowest pressure872 mbar (hPa; 25.75 inHg)
Seasonal statistics
Total depressions31 (record high)
Total storms26
Hurricanes16
(record high, tied with 1990, 1992 and 2014)
Major hurricanes
(Cat. 3+)
11 (record high)
Total fatalities39 direct, 5 indirect
Total damage$565 million (2015 USD)
Related articles
Pacific hurricane seasons
2013, 2014, 2015, 2016, 2017

The 2015 Pacific hurricane season was the second-most active Pacific hurricane season on record, with 26 named storms, only behind the 1992 season. A record-tying 16 of those storms became hurricanes, and a record 11 storms further intensified into major hurricanes throughout the season.[nb 1] The Central Pacific, the portion of the Northeast Pacific Ocean between the International Date Line and the 140th meridian west, had its most active year on record, with 16 tropical cyclones forming in or entering the basin. Moreover, the season was the third-most active season in terms of accumulated cyclone energy, amassing a total of 287 units. The season officially started on May 15 in the Eastern Pacific and on June 1 in the Central Pacific; they both ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Northeast Pacific basin. However, the formation of tropical cyclones is possible at any time of the year. This was shown when a tropical depression formed on December 31. The above-average activity during the season was attributed in part to the very strong 2014–16 El Niño event.

The season featured several long-tracking and powerful storms, although land impact was often minimal. In June, Hurricane Blanca, an early season Category 4 hurricane, killed four people due to rough seas. Hurricane Carlos caused minor damage while passing a short distance off the coast of Mexico. In July, the remnants of Hurricane Dolores brought record rainfall to Southern California and caused losses worth $50 million.[nb 2] On August 29, three Category 4 hurricanes (Kilo, Ignacio, Jimena) were all active simultaneously for the first time in recorded history. In September, moisture from Hurricane Linda contributed to storms that killed 21 people in Utah. Later that month, Hurricane Marty inflicted $30 million in damage to the southwestern coast of Mexico. In October, Hurricane Patricia became the most intense hurricane ever recorded in the Western Hemisphere, with a central pressure of 872 mbar (hPa; 25.75 inHg) and 1-minute sustained winds of 215 mph (345 km/h). After also becoming the strongest landfalling Pacific hurricane on record, Patricia claimed 13 lives and was responsible for $463 million in damages. The season's activity continued into November, when Hurricane Sandra became the strongest hurricane ever recorded in that month.

Seasonal forecasts[edit]

Record Named
storms
Hurricanes Major
hurricanes
Ref
Average (1981–2010): 15.4 7.6 3.2 [1]
Record high activity: 1992: 27 2015: 16 2015: 11 [2]
Record low activity: 2010: 8 2010: 3 2003: 0 [2]
Date Source Named
storms
Hurricanes Major
hurricanes
Ref
April 10, 2015 SMN 19 11 4 [3]
May 27, 2015 CPC 15–22 7–12 5–8 [4]
Area Named
storms
Hurricanes Major
hurricanes
Ref
Actual activity: EPAC 18 13 10
Actual activity: CPAC 8 3 1
Actual activity: 26 16 11

On April 10, 2015, the Servicio Meteorológico Nacional (SMN) issued its first outlook for the Pacific hurricane season, forecasting 19 named storms, 11 hurricanes, and 4 major hurricanes. The organization listed a set of seasons with similar atmospheric and oceanic conditions, including 1982, 1986, 1991, 1994, 2002, and 2014.[3] On May 27, the National Oceanic and Atmospheric Administration's Climate Prediction Center (CPC) released its forecast for the year, highlighting a 70% chance of an above-average season with 15–22 named storms, 7–12 hurricanes, 5–8 major hurricanes, and an Accumulated Cyclone Energy (ACE) index range of 110–190% of the median. While both organizations cited an intensifying El Niño as a cause of increased activity, the CPC also highlighted the difference in global sea surface temperature patterns in 2015 versus the 1995–2014 period.[3][4] The season ended up exceeding all of these forecasts with 26 named storms, 16 hurricanes, 11 major hurricanes, and an ACE index at more than 200% of the median.

Seasonal summary[edit]

Hurricane Sandra (2015)Hurricane PatriciaHurricane Marty (2015)Hurricane Linda (2015)Typhoon HalolaHurricane Carlos (2015)Hurricane Blanca (2015)Saffir–Simpson hurricane wind scale
Map of sea surface temperature (SST) anomalies in the Pacific Ocean on October 15, showing well above-normal SSTs east of the International Date Line (180°)

The Accumulated Cyclone Energy (ACE) index for the season was 160.4225 units in the Eastern Pacific and 126.535 units in the Central Pacific. The total ACE for the Northeast Pacific basin in 2015 amounted to 286.9575 units.[nb 3] ACE is a rough measure of the energy generated by a tropical cyclone over its lifespan, and is calculated every six hours when the tropical cyclone has sustained winds speeds of at least 39 mph (63 km/h). Therefore, more intense and longer-lived tropical cyclones will generate more ACE.[5]

Overall, 31 tropical cyclones formed, of which 26 reached tropical storm intensity and were named. A total of 16 of these storms became hurricanes, and a record-breaking 11 became major hurricanes.[nb 1] These values make the 2015 season the second-most active on record.[2][6] The Central Pacific, meanwhile, had its most active year on record, with 16 tropical cyclones forming in or entering the basin,[7] easily surpassing the old record of 11 set by 1992 and 1994.[8] The season officially began on May 15 in the Eastern Pacific, and on June 1 in the Central Pacific; the season ended officially on November 30,[9] though a tropical depression formed well after that on December 31.[10] The well-above-average activity levels were largely attributed to the strong 2014–16 El Niño event, which brought anomalously high sea surface temperatures and low vertical wind shear to western parts of the basin.[8][11] In fact, for the region between the 116th meridian west and the International Date Line, sea surface temperatures from July to October averaged 28 °C (82 °F), the highest value on record since reliable data records began in 1979. Wind shear in the region was also at its lowest on record during that period.[12] The existence of a large region of rising air over the basin during much of the season, a feature typical of El Niño events, further facilitated the development and intensification of the season's numerous tropical cyclones.[11]

Hurricanes Kilo (left), Ignacio (center), and Jimena (right), all at major hurricane intensity, spanning the Central and Eastern Pacific basins on August 30

The season started off with three successive hurricanes, with Andres and Blanca both reaching Category 4 status.[13] On June 3, Blanca became both earliest second hurricane and second major hurricane in the basin since reliable records began in 1971, and became the earliest instance of a landfall on the Baja California Peninsula.[14] Ten days later, Carlos became the second-earliest third hurricane on record.[15] After about a month of inactivity, eight systems formed in July, including five from July 8–12. Ela became the earliest named storm to form in the Central Pacific within the bounds of the official season, and along with Iune and Halola, marked the first month in the satellite era where three tropical cyclones were observed in the Central Pacific.[16][17] Six more systems formed in an active August.[18][19] Late on August 29, Hurricanes Kilo, Ignacio and Jimena intensified into Category 4 hurricanes. This was the first time in the historical record that three or more major hurricanes existed simultaneously in the Pacific east of the International Date Line, and that two or more major hurricanes existed simultaneously in the central Pacific.[20][21]

September saw the formation of five systems, excluding Kevin which was named in September but formed on August 31.[22][23] Three systems—Linda, Sixteen-E, and Marty—affected Mexico, with the first two also bringing floods to the Southwestern United States.[24][25][26] The flood event caused by Linda in Utah was also the state's deadliest.[24] October saw another five systems.[27][28] With the formation of Oho on October 3, the 2015 season surpassed 1992 and 1994 as the most active year on record in the Central Pacific.[29] During October 18–19, Olaf became the southernmost-forming hurricane and major hurricane in the Eastern Pacific.[30][31] Olaf later became the first system on record to cross from the Eastern Pacific into the Central Pacific and then back into the Eastern Pacific while still a tropical cyclone.[32] Patricia became the strongest hurricane in the basin on October 23 when its pressure fell to 892 mbar (hPa; 26.34 inHg), breaking the previous record of 902 mbar (hPa; 26.64 inHg) set by 1997's Hurricane Linda.[33] Patricia subsequently became the strongest tropical cyclone on record in the Western Hemisphere in terms of barometric pressure, with a central pressure of 872 mbar (hPa; 25.75 inHg). This value was also the second-lowest globally, behind Typhoon Tip of 1979 which had a central pressure of 870 mbar (hPa; 25.69 inHg). Additionally, its maximum sustained winds of 215 mph (345 km/h) were the strongest ever reliably recorded or estimated anywhere globally.[34] Patricia later became the strongest Pacific hurricane to strike Mexico after making landfall in Jalisco as a strong Category 4 hurricane.[34]

The following month tied for the most active November with the development of two systems, Rick and Sandra.[2][35] Sandra subsequently strengthened into a major hurricane, bringing the season total to a record eleven.[2] Its peak winds of 150 mph (240 km/h) and minimum central pressure of 934 mbar (hPa; 27.58 inHg) surpassed Hurricane Kenneth of 2011 for the strongest November Pacific hurricane in terms of both sustained winds and central pressure.[36] Despite the official end of the season on November 30,[9] anomalously favorable conditions in the Central Pacific gave rise to the final storm of the season, Tropical Depression Nine-C, which formed on December 31 and dissipated late the same day.[10] This marked the latest end to a Pacific hurricane season on record.[2]

Systems[edit]

Hurricane Andres[edit]

Category 4 hurricane (SSHWS)
Andres 2015-05-31 1825Z.jpg Andres 2015 track.png
DurationMay 28 – June 4
Peak intensity145 mph (230 km/h) (1-min)  937 mbar (hPa)

On May 23, the National Hurricane Center (NHC) began monitoring the potential for tropical cyclogenesis well south of Mexico over the following days.[37] A large area of disturbed weather associated with a broad low pressure area formed three days later, steadily organizing to become Tropical Depression One-E at 06:00 UTC on May 28.[38] With an increase in spiral banding and an expanding central dense overcast, the depression was upgraded to Tropical Storm Andres six hours later.[39] Directed west-northwest and eventually northwest by a subtropical ridge over Mexico, the cyclone quickly organized and became a hurricane on May 29. A spurt of intensification saw Andres strengthen into a strong Category 2 hurricane late the next day. Andres's intensification trend leveled off thereafter due to an eyewall replacement cycle and a brief increase in vertical wind shear, but Andres still managed to reach major hurricane status early on May 31, becoming one of only five major hurricanes during the month of May.[38] Although forecasts did not indicate additional strengthening,[40] Andres began a period of rapid deepening the following day as wind shear decreased, intensifying into a Category 4 hurricane at 00:00 UTC on June 1. Andres reached its peak intensity six hours later with winds of 145 mph (230 km/h).[38] Thereafter, the system moved west-northwestwards over cooler waters and into a more stable environment, which led to a swift weakening trend. Andres fell below hurricane strength on the morning of June 2, and weakened into a tropical storm a day later. Further weakening ensured as convection around Andres's center dissipated,[38] and the NHC declared Andres as a remnant low on June 4.[41]

Moisture extending from the remnants of Andres brought light rain to parts of the Southwest United States, with Phoenix, Arizona having measurable precipitation on June 5 for the first time since records began in 1896.[42] This moisture further extended into Colorado, resulting in scattered severe thunderstorms.[43]

Hurricane Blanca[edit]

Category 4 hurricane (SSHWS)
Blanca 2015-06-03 2025Z (cropped).jpg Blanca 2015 track.png
DurationMay 31 – June 9
Peak intensity145 mph (230 km/h) (1-min)  936 mbar (hPa)

A tropical wave first monitored by the NHC late on May 27 spawned a weak area of low pressure well south of Acapulco, Mexico, two days later.[44][45] Plagued by strong upper-level winds from Hurricane Andres, the disturbance slowly organized into the season's second tropical depression at 22:30 UTC on May 31 and further into Tropical Storm Blanca on the following day.[46][47] Moving little within a weak steering regime, the cyclone began rapid deepening by June 2 under favorable conditions aloft; at 18:00 UTC, it was upgraded to a Category 1 hurricane. Following the appearance of a pinhole eye, Blanca was upgraded to a Category 4 hurricane at 12:00 UTC on June 3. Shortly thereafter, Blanca reached its peak intensity with winds of 145 mph (230 km/h).[14] Tremendous upwelling of cooler waters, with some areas falling from 30 to 21 °C (86 to 70 °F),[48] resulted in weakening early on June 4.[49] Its eye quickly collapsed and convection diminished as it underwent an eyewall replacement cycle.[50] Reconnaissance aircraft flew into the storm on June 5 and found Blanca to have degraded to Category 1 status.[51] The next day, Blanca rapidly reintensified and reached its secondary peak as a Category 4 with winds of 130 mph (215 km/h).[52] Thereafter, cooler waters and southeasterly wind shear prompted a weakening phase once more.[53] After weakening to a tropical storm on June 7,[54] Blanca made landfall around 12:00 UTC on June 8, near Puerto Cortés with winds of 45 mph (75 km/h), and became the earliest instance of a landfall in the Baja California Peninsula since records began in 1949.[48][55] Thereafter, Blanca weakened to a tropical depression before degenerating into a remnant low early on June 9, as convection diminished.[56][57]

On June 3, precautionary alerts were raised across the southern Baja California Peninsula and much of Western Mexico, due to potential impacts from the hurricane.[58] A collective 3,300 troops from the Mexican Army and Navy were deployed to Baja California Sur to ensure the safety of residents.[59] Although Blanca remained far from Jalisco, large swells and rip currents produced by the hurricane claimed four lives.[60] Across Baja California Sur, high winds downed power lines and left 104,106 residents without electricity. However, around 90 percent of the outages were fixed within 12 hours of the storm.[61] The remnants of Blanca later brought much-needed rain to parts of Southern California. Daily rainfall records were broken in several areas, though accumulations were generally less than 1 in (25 mm).[62] Some flooding took place in Santa Barbara County.[63] Damage across the state amounted to $67,000.[64] Additionally, on June 10, some of Blanca's moisture moved north and brought light showers to the San Francisco Bay Area.[65]

Hurricane Carlos[edit]

Category 1 hurricane (SSHWS)
Carlos 2015-06-13 1755Z.jpg Carlos 2015 track.png
DurationJune 10 – June 17
Peak intensity90 mph (150 km/h) (1-min)  978 mbar (hPa)

In early June, a Kelvin wave interacted with a few tropical waves to the south of Mexico. The system gradually organized and was designated as a tropical depression on June 10, while situated about 290 mi (470 km) south-southeast of Puerto Escondido, Oaxaca. Drifting slowly northwestward, the depression was upgraded further to tropical storm intensity. Although persistent wind shear and dry air hampered intensification early on, Carlos strengthened into a hurricane on June 13 after moving into more favorable conditions. However, the return of dry air and upwelling caused the storm to deteriorate into a tropical storm. Paralleling the Mexican coast, Carlos regained hurricane intensity on June 15 and peaked with sustained winds of 90 mph (150 km/h) the next day. Wind shear and dry air afterwards led to rapid weakening, falling to tropical storm intensity on June 17 and degeneration into a remnant area of low pressure hours later.[66]

Carlos' formation prompted coastal authorities to enact precautionary measures along states deemed at risk. In Guerrero, 507 shelters were opened.[67] The NHC also issued several tropical cyclone warnings and watches between June 11 and June 17 from Jalisco to Guerrero. Rough seas along the shore generated by the hurricane caused widespread damage.[66] Twelve ships, including a yacht worth 11 million pesos (US$717,000),[68] sunk in Playa Manzanillo harbor.[69] The waves combined with heavy rain to inflict at least 5 million pesos (US$326,000) of damage on Michoacán's coastal installations.[66] Strong winds produced by the passing storm also downed trees, power poles, and billboards, especially in Acapulco.[70] There, 16 homes were swept away by the waves.[71]

Tropical Storm Ela[edit]

Tropical storm (SSHWS)
Ela 2015-07-09 2315Z.jpg Ela 2015 track.png
DurationJuly 8 – July 10
Peak intensity45 mph (75 km/h) (1-min)  1002 mbar (hPa)

A tropical wave crossing the eastern Pacific spawned an area of low pressure on July 3.[72] The system gradually organized amid persistent wind shear and on July 8, the system intensified into Tropical Depression Four-E just before it entered the area of responsibility of the Central Pacific Hurricane Center (CPHC).[73] On July 9, the depression intensified into a tropical storm as it tracked to the northwest, and was named Ela by the CPHC.[74][72] Ela intensified slightly to reach its peak intensity with 45 mph (75 km/h), however, strong wind shear prevented Ela from intensifying further by removing thunderstorms from the circulation center, in fact causing it to gradually weaken.[72] Eventually, Ela was downgraded into a depression on July 10, before being declared a remnant low well east of the Hawaiian Islands.[72]

Ela is one of just six tropical cyclones to form as a depression in the east Pacific basin but not be named until entering the central Pacific; the others are Lala, Li, Iniki and Lana. It would be succeeded by Hurricane Ulika a year later. It is also the fourth earliest storm to form during the calendar year in the central Pacific after Ekeka and Hali of 1992,[75] as well as Pali of 2016.[76]

Tropical Storm Halola[edit]

Tropical storm (SSHWS)
Halola 2015-07-13 0125Z.jpg Halola 2015 track.png
DurationJuly 10 – July 12 (exited basin)
Peak intensity60 mph (95 km/h) (1-min)  998 mbar (hPa)

A monsoon trough building across the Pacific Ocean spawned a large, ill-defined circulation well southwest of Hawaii on July 3. The circulation organized slightly and began to detach from the monsoon trough on July 6, but further development was halted for a while as an upper-level anticyclone imparted strong wind shear over the system. The anticyclone moved away on July 9, allowing the low-level circulation to move under the persistent convection to the northwest. As thunderstorm activity expanded in coverage, the system was declared Tropical Depression One-C by the CPHC at 06:00 UTC on July 10. Moving westwards under the influence a strong ridge to the north, the depression slowly strengthened into Tropical Storm Halola early on July 11. After intensifying to reach winds of 60 mph (95 km/h), a slight increase in wind shear prevented further strengthening. Maintaining that intensity, Halola crossed the International Date Line into the Western Pacific basin late on July 12, and entered the area of responsibility of the Japan Meteorological Agency.[77]

Tropical Storm Iune[edit]

Tropical storm (SSHWS)
Iune Jul 11 2015 2140Z.jpg Iune 2015 track.png
DurationJuly 10 – July 13
Peak intensity40 mph (65 km/h) (1-min)  1004 mbar (hPa)

A weak area of low pressure was first identified in the monsoon trough southeast of Hawaii on July 2. It drifted west-northwest, gradually becoming better defined as thunderstorm activity increased and it separated from the monsoon trough; by 06:00 UTC on July 10, there was sufficient organization to declare it a tropical depression. The small size of the cyclone made it especially susceptible to moderate upper-level winds, and it failed to intensify to Tropical Storm Iune until 18:00 UTC on July 11, when deep convection persisted near the center. No further intensification occurred amid light southerly wind shear, and Iune weakened to a tropical depression around 18:00 UTC on July 12 as it moved west-southwest. After being devoid of thunderstorm activity for 18 hours, the storm degenerated to a remnant area of low pressure by 12:00 UTC the next day. The post-tropical cyclone moved west across the central Pacific before finally dissipating around 12:00 UTC on July 17.[78]

Hurricane Dolores[edit]

Category 4 hurricane (SSHWS)
Dolores 2015-07-15 1755Z.jpg Dolores 2015 track.png
DurationJuly 11 – July 18
Peak intensity130 mph (215 km/h) (1-min)  946 mbar (hPa)

A westward-moving tropical wave crossed Central America and entered the Eastern Pacific. On July 11, the system was declared Tropical Depression Five-E. Despite moderate northwesterly wind shear, the depression quickly strengthened into Tropical Storm Dolores and reached hurricane status early on July 13. A day later, when the shear diminished, Dolores rapidly intensified into a Category 4 hurricane with winds 130 mph (215 km/h) and a minimum pressure of 946 mbar (hPa; 27.94 inHg). However, as Dolores approached Socorro Island, the cyclone underwent an eyewall replacement cycle and began to steadily weaken. By the morning of July 17, Dolores had deteriorated to a tropical storm, and eventually degenerated into a post-tropical remnant low about 300 miles west of the Baja California coast the next day. The remnant low slowly curved southwards and dissipated on 22 July west of San Diego, California.[79][80]

Moisture extending from the storm's remnants brought record rains and thunderstorms to Southern California; record monthly rainfall totals include 2 in (51 mm) in San Diego, 1.30 in (33 mm) in Los Angeles, and 1.16 in (29 mm) in Paso Robles. In the foothills and mountains of east San Diego County (e.g. the town of Ramona), rainfall exceeded 4 in (100 mm).[81][82] This had the effect of helping firefighters contain the North Fire,[83] but also resulted in debris flows and rock slides that damaged about 90 homes and submerged cars,[80] and washed out a bridge along Interstate 10.[84] The San Diego River reached levels of 8.9 ft (2.7 m)—just below flood stage—and overflowed its banks in a few areas.[80] Flash flooding in Riverside County washed out a portion of Interstate 10 and a bridge; losses reached $50 million.[85]

Tropical Storm Enrique[edit]

Tropical storm (SSHWS)
Enrique 2015-07-14 2155Z (cropped).jpg Enrique 2015 track.png
DurationJuly 12 – July 18
Peak intensity50 mph (85 km/h) (1-min)  1000 mbar (hPa)

A tropical wave about 1,000 mi (1,610 km) southwest of the tip of the Baja California Peninsula spawned a broad area of low pressure on July 10. The low's circulation became increasingly well defined as the tropical wave moved away from the system, leading to the classification of Tropical Depression Six-E at 12:00 UTC on July 12.[86] Gradually organizing as it began to move west-northwestwards, the depression intensified to become Tropical Storm Enrique eighteen hours later.[87] Despite being situated in a generally favorable environment, dry air to the northwest of Enrique entrained into its circulation, thus Enrique struggled to intensify. Eventually, the system reached its peak intensity with 50 mph (85 km/h) winds and a minimum pressure of 1000 mbar (hPa; 29.53 inHg) late on July 14.[86][88] Thereafter, cooling sea surface temperatures and increasing southwesterly vertical wind shear took their toll on the cyclone, and Enrique started to weakened on July 15. Enrique continued to maintain its intensity over the next two days as it began to slow down and turn to the southwest under the influence of Hurricane Dolores to its east.[86] However, during the afternoon of July 17, Enrique weakened to a tropical depression,[89] and further to a remnant low the next day. The remnants re-curved eastward over the next two days.[86] Throughout its lifetime, Enrique never affected land.[90]

Tropical Storm Felicia[edit]

Tropical storm (SSHWS)
Felicia 2015-07-23 1845Z.jpg Felicia 2015 track.png
DurationJuly 23 – July 25
Peak intensity40 mph (65 km/h) (1-min)  1004 mbar (hPa)

A westward-tracking tropical wave moved off Africa on July 7, crossing into the East Pacific nine days later. The disturbance was initially disorganized, with a broad area of low pressure and intermittent convection; by 06:00 UTC on July 23, however, it acquired sufficient organization to be declared a tropical depression about 430 mi (690 km) southwest of the southern tip of Baja California.[91][92] Six hours later, the depression intensified into Tropical Storm Felicia and attained peak winds of 40 mph (65 km/h).[91] The negative effects of shear, dry air, and cooler waters began to affect Felicia almost immediately, and the cyclone weakened to a tropical depression by 00:00 UTC on July 24.[91][93] All associated convection with the storm dissipated, marking Felicia's degeneration into a remnant low by 18:00 UTC that day. The low turned west and southwest prior to opening into a trough on July 28.[91]

Tropical Depression Eight-E[edit]

Tropical depression (SSHWS)
08E 2015-07-28 1900Z.jpg 08-E 2015 track.png
DurationJuly 27 – July 29
Peak intensity35 mph (55 km/h) (1-min)  1006 mbar (hPa)

A tropical wave accompanied by showers and thunderstorms entered the Eastern Pacific Ocean on July 19. Tracking steadily westwards, the wave formed a low pressure area in the middle of the Eastern Pacific on July 27. Turning slightly to the west-northwest, the low slowly intensified into Tropical Depression Eight-E six hours later. However, strong north-northwesterly wind shear prevented it from intensifying into a tropical storm. As Eight-E moved into a drier environment, it failed to sustain deep convection near its center, and eventually degenerated into a remnant low late on July 29. Eight-E's remnants continued tracking in a westward direction and opened up into a trough by August 1 well east-southeast of Hawaii.[94]

Hurricane Guillermo[edit]

Category 2 hurricane (SSHWS)
Guillermo 2015-07-31 1935Z.jpg Guillermo 2015 track.png
DurationJuly 29 – August 7
Peak intensity110 mph (175 km/h) (1-min)  967 mbar (hPa)

A tropical disturbance well south of the Baja California Peninsula gained enough organization to be declared Tropical Depression Nine-E on July 29. Located in an environment of low wind shear, high sea surface temperatures and abundant moisture, conditions were very favorable for strengthening, allowing Nine-E to intensify into Tropical Storm Guillermo just 6 hours later. Continuing to quickly intensify while tracking steadily west-northwestwards, Guillermo became a hurricane only 36 hours after its formation, and eventually reached peak intensity with winds of 110 mph (175 km/h)—a strong Category 2 hurricane. Guillermo weakened slightly afterwards, but remained at Category 2 strength as it crossed 140°W into the Central Pacific late on August 1. However, as Guillermo neared Hawaii, increasing southwesterly wind shear began to weaken the cyclone, and Guillermo eventually degraded to a tropical storm on August 3. Wobbling towards the west-northwest following a break in the subtropical ridge, Guillermo weakened further to a tropical depression on August 7, located 90 mi (150 km) from Maui. Not long after, Guillermo degenerated to a post-tropical low, and dissipated altogether by August 9.[95]

On August 6, some of Guillermo's moisture was brought to Northern California and the San Francisco Bay Area by the jet stream, bringing rare dry lightning storms to those areas during the night.[96]

Hurricane Hilda[edit]

Category 4 hurricane (SSHWS)
Hilda 2015-08-08 2025Z.jpg Hilda 2015 track.png
DurationAugust 5 – August 13
Peak intensity145 mph (230 km/h) (1-min)  937 mbar (hPa)

A tropical wave behind Guillermo spawned a well-defined low pressure area well to the west of Mexico, which became Tropical Depression Ten-E on August 5. The depression intensified into Tropical Storm Hilda the next day. Amid moderate northeasterly wind shear and warm waters, Hilda gradually strengthened into a hurricane on August 7 while moving steadily westwards. Rapid intensification ensued thereafter as the shear diminished and a small inner core developed, and Hilda became a major hurricane just before entering the Central Pacific. Continuing to rapidly intensify, Hilda eventually reached its peak intensity as a Category 4 hurricane late on August 8, possessing 145 mph (230 km/h) sustained winds and a minimum pressure of 937 mbar (hPa; 27.67 inHg). Hilda then moved over slightly cooler waters and into a drier environment, resulting in a weakening trend that saw Hilda drop below major hurricane status late on August 9. The next two days saw Hilda turn to the northwest and slow down while rounding the southwestern part of a subtropical ridge. Weakening continued and accelerated on August 10–11 as the subtropical jet stream over Hawaii inflicted strong wind shear over Hilda, exposing the low-level circulation. Under the influence of both the strong westerly jet stream and the easterly trade winds, Hilda became almost stationary as it rapidly dropped below hurricane strength on August 12. Convection over Hilda mostly dissipated by August 13, and the shallower system began to track to the west-southwest. Hilda degenerated to a remnant low south of Hawaii by August 14,[97] after bringing heavy rain to the Big Island.[98]

Tropical Depression Eleven-E[edit]

Tropical depression (SSHWS)
11E 2015-08-16 2130Z.jpg 11-E 2015 track.png
DurationAugust 16 – August 17
Peak intensity35 mph (55 km/h) (1-min)  1003 mbar (hPa)

A broad area of low pressure around 485 mi (780 km) south-southwest of Cabo San Lucas organized into Tropical Depression Eleven-E on August 16. Moving on a northwesterly to west-northwesterly path, the cyclone failed to intensify due to its large circulation and entered an area of unfavorable conditions late on August 17. Southeasterly shear, dry air entrainment and cooler waters caused the depression to lose its deep convection, eventually degenerating into a remnant low by August 18. The low turned to the north-northwest and dissipated 2 days later around 980 mi (1,575 km) west of Punta Eugenia.[99]

Hurricane Loke[edit]

Category 1 hurricane (SSHWS)
Loke 2015-08-24 2200Z.jpg Loke 2015 track.png
DurationAugust 21 – August 26
Peak intensity75 mph (120 km/h) (1-min)  985 mbar (hPa)

A low-level trough developed along the intertropical convergence zone southeast of Hawaii on August 13. It merged with the remnants of Hurricane Hilda into the monsoon trough by August 18, and continued west with intermittent bursts of convection. One such burst detached a well-defined circulation from the monsoon trough and pulled it northeastwards, leading to the formation of a tropical depression by 00:00 UTC on August 21, which became Tropical Storm Loke later that day. A nearby upper-level trough restricted the outflow of the storm shortly after formation, causing it to briefly weaken to a tropical depression early on August 22 while it moved in an undulating fashion. However, as Loke accelerated to the northeast with the trough positioned to the northwest, the upper-level environment became more favorable, and the system regained tropical storm strength early on August 23. Developing a cloud-filled eye, Loke reached hurricane intensity around 18:00 UTC on August 24, simultaneously attaining peak winds of 75 mph (120 km/h). Afterwards, Loke was once again hindered by the aforementioned nearby trough, which served to impart strong wind shear over Loke and pull Loke to the north. The cyclone weakened to a tropical storm late on August 25 as it underwent extratropical transition, before it was rapidly drawn northwestwards into the circulation of a large extratropical low (formerly Typhoon Atsani) by 00:00 UTC on August 27.[100]

Hurricane Kilo[edit]

Category 4 hurricane (SSHWS)
Kilo 2015-08-29 2220Z.jpg Kilo 2015 track.png
DurationAugust 22 – September 1 (Exited basin)
Peak intensity140 mph (220 km/h) (1-min)  940 mbar (hPa)

The disturbance that would became Kilo formed on August 17 southeast of the Big Island of Hawaii, developing within an east to west oriented low-level trough that extended between 135°W and 160°W along 8°N.[20] The disturbance remained poorly organized, producing intermittent convection mainly to the west of its center of circulation, until the early morning hours of August 20, when the disturbance started to develop a burst of deep convection.[20] However this convection quickly dissipated as a poorly organized and elongated low-level circulation emerged well east of the system.[20] Sporadic deep convection continued to move rather quickly toward the west-northwest through August 21, as the disturbance was steered by a low and mid-level ridge to its north, causing it to suffer from the effects of the presence of easterly vertical wind shear.[20] On early August 22, deep convection became more persistent in the increasingly organized LLCC, as easterly shear apparently relaxed, which led to the formation of Tropical Depression Three-C.[20] The storm would remain at tropical depression strength for the next three days, as the presence of mid-level ridges to its north prevented any further strengthening.[101] Despite its instability, Kilo's large-scale circulation brought enhanced moisture into Hawaii, leading to locally heavy rainfall in that state.[102] After nearby Hurricane Loke moved north and dissipated on August 26, the system was able to strengthen into a tropical storm, receiving the name Kilo.[20][103] Intensification resumed the next day, with Kilo reaching hurricane strength on August 28.[104] By August 29, Kilo had rapidly intensified into a major hurricane, as the storm neared the International Date Line.[105] Kilo peaked in intensity on August 30 as a Category 4 hurricane with winds of 140 mph (220 km/h) and a minimum central pressure of 940 mbar (hPa; 27.76 inHg).[106] Kilo was also one of three simultaneous major hurricanes east of the International Date Line along with Ignacio and Jimena, the first such occurrence in recorded history.[21] After peaking in strength, Kilo fluctuated between Category 3 and 4 strength as it slowly moved northwest, before slowly weakening below major hurricane status as conditions became less favorable.[107] It crossed the International Date Line early on September 1, becoming Typhoon Kilo.[108] Kilo continued on to become one of the longest-lived and longest-tracked tropical cyclones on record, with a total lifespan of 22 days, and travelling over 4,000 mi (6,400 km) from its formation as a depression south of Hawaii to its dissipation near the western Kuril Islands in Alaska.[20][109]

Hurricane Ignacio[edit]

Category 4 hurricane (SSHWS)
Ignacio 2015-08-29 2040Z.jpg Ignacio 2015 track.png
DurationAugust 25 – September 4
Peak intensity145 mph (230 km/h) (1-min)  942 mbar (hPa)

On August 25, a low-pressure system formed and organized into Tropical Depression Twelve-E, before strengthening into Tropical Storm Ignacio. Ignacio initially moved west-northwest, posing a threat to Hawaii. On August 26, Ignacio became a hurricane while continuing its trek towards Hawaii. Over the next few days, Ignacio struggled to intensify while being impacted by moderate wind shear. As wind shear relaxed, Ignacio was able to quickly intensify to major hurricane status on August 29.[110] At this time, the Big Island of Hawaii was placed under a tropical storm watch, as the island began feeling the effects of high surf.[111] Ignacio continued to rapidly intensify as it turned to the northwest and away from the Hawaii, attaining peak intensity at Category 4 status with winds of 145 mph (230 km/h) and a minimum central pressure of 942 mbar (hPa; 27.82 inHg) on August 30.[110] Ignacio was also one of three simultaneous Category 4 hurricanes east of the International Date Line along with Kilo and Jimena, the first such occurrence in recorded history.[20][21]

After peaking in intensity, Ignacio began weakening as southwesterly wind shear increased. The system weakened to tropical storm strength at midnight on September 2 well north of Hawaii, but was soon able to reattain hurricane status while passing over anomalously warm waters and experiencing a brief respite in wind shear. Continuing to track northwards over decreasing sea surface temperatures, Ignacio weakened to a tropical storm for the last time on September 3, and became post-tropical late early the next day. The remnants of Ignacio continued north across the Pacific, before turning to the east-northeast towards western Canada on September 6. On September 8, the extratropical remnants of Ignacio were absorbed by a cold front, hundreds of miles south of Alaska.[110]

Hurricane Jimena[edit]

Category 4 hurricane (SSHWS)
Jimena 2015-08-29 2225Z.jpg Jimena 2015 track.png
DurationAugust 26 – September 10
Peak intensity155 mph (250 km/h) (1-min)  932 mbar (hPa)

A westward-moving low pressure area organized into a tropical depression on August 26, around 640 mi (1030 km) southwest of Manzanillo, Mexico.[112] The next day, the depression developed a tight inner core with sustained gale-force winds; accordingly, it was named Jimena by the NHC.[113] Moving over very warm waters near 30 °C (86 °F) and located in an environment of low wind shear and abundant moisture, Jimena underwent a period of rapid deepening over the next 48 hours.[112] The NHC upgraded Jimena to a hurricane merely 30 hours after being named,[114] and further to a major hurricane 18 hours later.[115] Early on August 29, Jimena reached its peak intensity with winds of 155 mph (250 km/h)—just below Category 5 status on the Saffir-Simpson hurricane wind scale—and a minimum barometric pressure of 932 mbar (hPa; 27.52 inHg).[112] Soon after, Jimena turned to the west-northwest and underwent an eyewall replacement cycle.[116] Despite weakening slightly, Jimena remained at Category 4 status, thus becoming one of three simultaneous Category 4 major hurricanes east of the International Date Line on August 30—the first such occurrence of its kind.

Early on August 31, Jimena completed the eyewall replacement cycle and quickly regained 150 mph (240 km/h) winds.[117] However, upwelling of cooler waters beneath the hurricane and entrainment of mid-level dry air into the circulation, as well as a second eyewall replacement cycle, resulted in a steady weakening.[112] The next day, Jimena crossed 140°W as a Category 3 hurricane and entered the jurisdiction of the CPHC.[112][118] Jimena continued to weaken slowly amid cooling sea surface temperatures and increasing northerly wind shear, eventually degrading below hurricane status on September 5.[112][119] Curving to the northwest, bursts of convection maintained Jimena as a tropical storm, in spite of westerly wind shear in excess of 20 knots causing the low-level circulation center to be exposed.[120][121] Devoid of deep convection near its center, Jimena eventually weakened to a tropical depression on September 9 as it turned west-southwestwards towards the Hawaiian islands.[122] Succumbing to the strong shear, Jimena degenerated into a remnant low and dissipated soon after.[112] Jimena never posed a threat to land, only bringing scattered heavy rains to Hawaii.[123]

Tropical Storm Kevin[edit]

Tropical storm (SSHWS)
Kevin 2015-09-03 2050Z.jpg Kevin 2015 track.png
DurationAugust 31 – September 5
Peak intensity60 mph (95 km/h) (1-min)  998 mbar (hPa)

A tropical wave crossed Central America on August 25. Although it initially only produced transient bursts of convection, slow organization of the feature led to the formation of a tropical depression by 18:00 UTC on August 31 while located well south of Baja California. Steered northwest and the north-northwest, the cyclone intensified into Tropical Storm Kevin by 18:00 UTC the next day while being plagued by moderate wind shear. After reaching peak winds of 60 mph (95 km/h) on September 3, a further increase in upper-level winds caused the low- and mid-level circulations to become displaced. Devoid of deep convection, Kevin degenerated to a remnant low by 12:00 UTC on September 5; the remnant circulation drifted northwest and dissipated the following day.[124]

Hurricane Linda[edit]

Category 3 hurricane (SSHWS)
Linda 2015-09-08 2110Z.jpg Linda 2015 track.png
DurationSeptember 5 – September 10
Peak intensity125 mph (205 km/h) (1-min)  950 mbar (hPa)

Early in September, a cluster of clouds began to organize into a tropical system. At 18:00 UTC on September 5, they organized enough to be called Tropical Depression Fifteen-E. Twelve hours later, the depression organized enough to be classified as a tropical storm and was given the name Linda. Linda rapidly strengthened as it moved on a northwestward course, with large amounts of deep convection forming around the center, and became a hurricane just twelve hours after becoming a tropical storm. On September 7, Linda became a Category 2 hurricane. Linda's strengthening stalled thereafter as wind shear increased slightly and dry air intruded on Linda's inner core. The next day, however, Linda again quickly intensified, this time to a Category 3 major hurricane. From September 9 onwards, Linda rapidly weakened as it moved into a an area of dry, stable air and decreasing water temperatures, becoming a remnant low less than a week after forming. Linda's remnants slowed as they turned to the west-northwest and then back to the east before dissipating on September 14.[24]

Monsoonal moisture pulled north from Linda brought thunderstorms to portions of California beginning September 10. Flooding and rock slides prompted numerous road closures. One person drowned in the San Bernardino National Forest. Remnant moisture from Linda with a weak cold front also caused record heavy rainfall in Los Angeles on September 15,[125][126] with three swift water rescues and roughly 2 in (51 mm) of rain across the Los Angeles Basin.[127] Losses in the state reached $2.1 million.[128] Moisture from Linda also catalyzed the formation of scattered thunderstorms across Utah on September 14,[129] giving rise to two major flash flood incidents that became the deadliest flood event in Utah's history, with 21 people killed.[24] The first flash flood, occurring near Hildale, swept away two vehicles carrying a total of 16 people while they were watching the rising floodwaters, killing 13 of them.[130] Another death occurred when a man was swept away by floodwaters while traversing remote dirt roads.[131] The second flash flood occurred in Keyhole Canyon at Zion National Park, causing seven canyoneers within the area to perish.[132] Damage totals in Washington County, Utah reached $750,000,[133] while downstream flooding caused a further $500,000 of damage in Colorado City, Arizona.[134] The thunderstorms also caused some scattered damage across Arizona, with losses reaching $206,000.[135]

According to San Jose State University, Linda's remnants may have also contributed to the severity of the Valley Fire.[136]

Tropical Storm Malia[edit]

Tropical storm (SSHWS)
Malia 2015-09-20 0005Z.jpg Malia 2015 track.png
DurationSeptember 18 – September 22
Peak intensity50 mph (85 km/h) (1-min)  992 mbar (hPa)

A trough of low pressure formed near the eastern reaches of the central Pacific on September 9. It moved swiftly westward and slowly organized into a tropical depression around 18:00 UTC on September 18 as deep convection formed near its center. The nascent cyclone moved northeast after formation, steered between a ridge to its northeast and a trough to its northwest. Strong upper-level winds plagued the system throughout its duration, but the depression nonetheless intensified into Tropical Storm Malia around 00:00 UTC on September 21 and attained peak winds of 50 mph (85 km/h) twelve hours later. Malia turned northwest under increasing influence from the upper-trough, which simultaneously increased wind shear over the cyclone. After lacking deep convection for several hours, the storm degenerated to a remnant low by 18:00 UTC on September 22. The post-tropical cyclone moved north before being absorbed by an extratropical low over the north-central Pacific the next day.[137]

Tropical Depression Sixteen-E[edit]

Tropical depression (SSHWS)
16E 2015-09-20 1820Z.jpg 16-E 2015 track.png
DurationSeptember 20 – September 21
Peak intensity35 mph (55 km/h) (1-min)  1001 mbar (hPa)

A tropical wave gained enough organization to be declared Tropical Depression Sixteen-E on September 20. Located in an environment of strong southerly shear, the depression failed to intensify into a tropical storm. The next day, the heavily sheared system made landfall on Baja California, then on Isla Tiburon, and finally in Sonora, Mexico. It dissipated just hours later, with its remnants going on to affect parts of Arizona and New Mexico.[25]

Widespread heavy rains in Baja California and Sonora caused heavy flooding. Preliminary damage estimates in El Fuerte, Sinaloa, reached 300 million pesos (US$17.7 million).[25][138] The remnant low brought considerable moisture to the Desert Southwest, and later combined with other systems to produce flooding across the Great Plains and Upper Midwest.[25][139] Rainfall in Roswell, New Mexico, reached 3 in (76 mm). One person drowned along the Rio Grande in New Mexico.[140] Flooding also took place near Phoenix, Arizona.[139]

Tropical Storm Niala[edit]

Tropical storm (SSHWS)
Niala 2015-09-25 2020Z.jpg Niala 2015 track.png
DurationSeptember 25 – September 28
Peak intensity65 mph (100 km/h) (1-min)  992 mbar (hPa)

On September 20, a tropical disturbance was identified southeast of Hawaii, moving westward south of the subtropical ridge.[141] The disturbance organized, a which led to the formation of Tropical Depression Six-C on September 25.[141] It was upgraded into Tropical Storm Niala soon after, and the storm headed west-northwest towards Hawaii.[141] Niala reached its peak intensity with winds of 65 mph, and a pressure of 992 mbars.[141] At this point, Tropical Storm Warnings were issued for the Big Island, as were High Surf & Marine Advisories for the same area.[141] Throughout September 26, forecasts called for a westwards turn, just barely missing the Big Island. The next day, however, it became evident that Niala was turning more towards the southwest by being steered by the lower level winds, sparing Hawaii from landfall.[141] At this time, Niala dropped to 50 mph winds, and subsequently degraded into a depression on the 28th.[141] Later that day, unfavorable conditions including high wind shear weakened the storm even more, and Niala degenerated into a post-tropical remnant low late at 0000 UTC on September 29.[142] The remnant low continued westwards, dissipating early October 1.[141]

Hurricane Marty[edit]

Category 1 hurricane (SSHWS)
Marty 2015-09-28 1735Z.jpg Marty 2015 track.png
DurationSeptember 26 – September 30
Peak intensity80 mph (130 km/h) (1-min)  987 mbar (hPa)

A tropical wave, the northern portion of which led to the formation of the Atlantic's Tropical Depression Nine, emerged off the western coast of Africa on September 10. Steered steadily westward, the wave entered the East Pacific where deep convection coalesced around a well-defined center; this led to the formation of a tropical depression about 335 mi (540 km) southwest of Acapulco, Mexico by 18:00 UTC on September 26. The depression intensified into Tropical Storm Marty six hours later as it drifted north. Amid an environment conducive for strengthening, Marty reached hurricane intensity at 12:00 UTC on September 28 and attained peak winds of 80 mph (130 km/h) shortly thereafter. Wind shear abruptly increased following peak intensity, causing the cyclone to weaken quickly; it was downgraded to a tropical storm at 06:00 UTC on September 29 and degenerated into a remnant low a day later. The low eventually dissipated south of the Mexico coastline on October 4.[26]

Heavy rains and flooding from the remnants of Marty rendered 35,000 people homeless in Sonora. Flooding in Guaymas damaged 800 homes and 400 vehicles; three people sustained injuries.[143] Damage in the city reached 500 million pesos (US$30 million). Rains from Marty also caused several landslides in Guerrero, as well as flooding that damaged 300 homes west of Acapulco and injured two.[26]

Hurricane Oho[edit]

Category 2 hurricane (SSHWS)
Oho 2015-10-06 2310Z.jpg Oho 2015 track.png
DurationOctober 3 – October 8
Peak intensity110 mph (175 km/h) (1-min)  957 mbar (hPa)

In an uncommon occurrence, a slow moving disturbance detached from a monsoon trough southeast of Hawaii and became Tropical Depression Seven-C on October 3.[144] With a favorable environment, the storm became Tropical Storm Oho quickly after.[144] With this, Oho became the record breaking twelfth storm this year to enter, or form in the Central Pacific. Under southwesterly wind shear, Oho slowly intensified while accelerating northeastwards.[144] While tracking northeastward, Oho became a Category 2 on October 7, attaining peak intensity of 110 mph and a pressure of 957 mbars.[144] Shortly after its peak, Oho moved to an area with cooler ocean temperatures and increasing southwesterly wind shear, which caused the storm to weaken and to lose its tropical characteristics.[144] The storm became extratropical on October 8 and briefly weakened to a gale low on early October 9.[144] However, due to strong baroclinicity, Ex-Oho briefly re-attained hurricane-force winds before starting to gradually weaken.[144] On October 10, Oho's remnants moved into Alaska as a moderate extratropical storm, where it weakened, until the system dissipated over western Canada 6 hours later.[145][144]

Tropical Depression Eight-C[edit]

Tropical depression (SSHWS)
08C 2015-10-04 2155Z.jpg 08-C 2015 track.png
DurationOctober 3 – October 4
Peak intensity35 mph (55 km/h) (1-min)  1001 mbar (hPa)

On September 30, a tropical disturbance developed from a monsoon trough well east of the International Date Line. At that time, the system was about 1,035 mi (1,665 km) southwest of Hawaii. Slowly organizing over the next few days, the CPHC started to issue advisories on it as a tropical depression on October 3 and designated it as Eight-C. Shortly after however, increasing southerly wind shear prevented the storm from intensifying to a tropical storm and caused its convection to collapse. With the low-level circulation being displaced to the south of the quickly dissipating convection, the CPHC issued its final advisory on the next day. Eight-C's remnants slowly drifted west-northwestward, crossing the Date Line on October 6 and dissipated a few hours later.[146] The Japan Meteorological Agency, however, still began to warn on the system as a tropical depression.[147]

Tropical Storm Nora[edit]

Tropical storm (SSHWS)
Nora 2015-10-11 2020Z.jpg Nora 2015 track.png
DurationOctober 9 – October 15
Peak intensity70 mph (110 km/h) (1-min)  993 mbar (hPa)

A tropical wave departed the coast of Africa on September 19, eventually crossing Central America on October 3. It organized once in the eastern Pacific, becoming a tropical depression around 12:00 UTC on October 9 and intensifying into Tropical Storm Nora twelve hours later. On a west to west-northwest track, the cyclone entered the central Pacific on October 11, where favorable environmental conditions allowed it to peak just shy of hurricane strength. Upper-level winds soon became hostile, causing the system to weaken to a tropical depression early on October 14, degenerate to a remnant low late the next day, and ultimately dissipate just southeast of Hawaii around 00:00 UTC on October 16.[148]

Hurricane Olaf[edit]

Category 4 hurricane (SSHWS)
Olaf 2015-10-20 1054Z.jpg Olaf 2015 track.png
DurationOctober 15 – October 27
Peak intensity150 mph (240 km/h) (1-min)  938 mbar (hPa)

Olaf originated from a broad low pressure area that formed late on October 9. At first, it showed some signs of organization, but convection associated with the system soon diminished as it tracked steadily westwards. Eventually the system reorganized, and by October 15, it had gained enough organization to be designated as Tropical Depression Nineteen-E. The depression organized very slowly due to its elongated circulation, and only became a tropical storm two days later, upon which the NHC named it Olaf. Soon after, Olaf began to rapidly intensify amid very favorable environmental conditions and became a hurricane on October 18, with hints of an eye starting to appear within a small central dense overcast.[32] Located at just 9.3°N, it broke the record for the lowest-latitude hurricane formation in the Eastern Pacific basin since reliable records began in 1971.[30] Olaf's intensification rate increased further overnight, and the next day, Olaf became a major hurricane with a well-defined pinhole eye.[32] At 9.8°N, it broke the record for the lowest-latitude major hurricane formation in the Eastern Pacific basin as well.[31] Six hours later, Olaf was upgraded to a Category 4 hurricane, the eighth of the season. Moving west-northwestwards, Olaf reached peak intensity with 150 mph (240 km/h) winds and a pressure of 938 mbar (hPa; 27.70 inHg), just as it crossed into the Central Pacific basin.[32]

After maintaining peak intensity for 12 hours, Olaf weakened to Category 3 status as it underwent an eyewall replacement cycle and encountered some dry mid-level air. Although the eye reappeared on satellite as the eyewall cycle completed, another one began while northwesterly wind shear increased, and Olaf weakened below major hurricane status while being pulled to the north by a passing trough. However, Olaf's northward movement resulted in a respite in shear, allowing Olaf to reintensify to a secondary peak intensity of 120 mph (195 km/h) on October 23. The next day, decreasing sea surface temperatures and another increase in wind shear finally began to weaken the storm for good. Despite maintaining a ragged eye until October 25, a further increase in wind shear from an approaching trough caused Olaf to weaken to a tropical storm. The same trough also accelerated Olaf to the east, and Olaf re-entered the Eastern Pacific on October 26, becoming the first storm on record to cross into the Central Pacific and turn back into the Eastern Pacific while still a tropical cyclone. The last of Olaf's deep convection continued to be sheared away, and Olaf became post-tropical on October 27 while still producing gale-force winds. Olaf's shallow remnants gradually weakened and turned back to the southwest, before dissipating on October 28.[32]

Hurricane Patricia[edit]

Category 5 hurricane (SSHWS)
Patricia 2015-10-23 1730Z.jpg Patricia 2015 track.png
DurationOctober 20 – October 24
Peak intensity215 mph (345 km/h) (1-min)  872 mbar (hPa)

Tropical Depression Twenty-E formed on October 20, off the southwestern coast of Mexico. It only slowly intensified at first, becoming Tropical Storm Patricia later that day. Entering an atmosphere highly conducive to rapid deepening on October 21, Patricia organized rapidly, and became a hurricane late that day. On October 22, explosive intensification occurred, and in only 24 hours, Patricia became a Category 5 hurricane with 175 mph (280 km/h) winds.[34] The intensification rate rivaled those of Hurricane Linda in 1997 and Hurricane Wilma in 2005. Patricia subsequently attained winds of 215 mph (345 km/h) and a central pressure of 872 mbar (hPa; 25.75 inHg), becoming the strongest tropical cyclone ever recorded in the Western Hemisphere, surpassing both the previous central pressure record set by Hurricane Wilma and the previous 1-minute sustained wind record set by Hurricane Allen. Afterwards, as it approached and later passed over Western Mexico, Patricia weakened even more rapidly than it intensified; just 30 hours after peaking in intensity, it was downgraded to a remnant low at 18:00 UTC on October 24.[149] However, Patricia's landfall near Cuixmala, Jalisco as a Category 4 hurricane with winds of 150 mph (240 km/h), was still sufficient to qualify as the strongest landfall by any Pacific hurricane.[34]

Tropical Storm Rick[edit]

Tropical storm (SSHWS)
Rick 2015-11-19 2015Z.jpg Rick 2015 track.png
DurationNovember 18 – November 22
Peak intensity40 mph (65 km/h) (1-min)  1002 mbar (hPa)

A tropical wave moved off the western coast of Africa on November 3, entering the East Pacific roughly two weeks later. The disturbance encountered a persistent area of convection in the ITCZ, eventually coalescing into a tropical depression by 12:00 UTC on November 18 while located 715 mi (1,150 km) south-southeast of the southern tip of Baja California. Plagued by moderate southeasterly wind shear, the depression slowly intensified into Tropical Storm Rick and simultaneously attained peak winds of 40 mph (65 km/h) by 12:00 UTC on November 19. The cyclone failed to intensify further as it tracked west-northwest within a dry environment, weakening to a tropical depression by 06:00 UTC on November 22 and further degenerating into a remnant low twelve hours later. The low tracked northwest and eventually southwest prior to dissipating early on November 26.[150]

Hurricane Sandra[edit]

Category 4 hurricane (SSHWS)
Sandra 2015-11-25 Suomi-NPP.png Sandra 2015 track.png
DurationNovember 23 – November 28
Peak intensity150 mph (240 km/h) (1-min)  934 mbar (hPa)

Originating from a tropical wave that emerged off the west coast of Africa on November 6, Sandra was first classified as a tropical depression on November 23 well south of Mexico. Environmental conditions, including high sea surface temperatures and low wind shear, were highly conducive to intensification and the storm quickly organized. A small central dense overcast developed atop the storm and Sandra reached hurricane status early on November 25 after the consolidation of an eye. The hurricane achieved its peak as a Category 4 hurricane with winds of 150 mph (240 km/h) and a pressure of 934 mbar (hPa; 27.58 inHg) early on November 26. This made Sandra the strongest November hurricane on record in the Northeastern Pacific, surpassing Hurricane Kenneth in 2011. Thereafter, increasing shear degraded the hurricane's structure and weakening ensued. Rapid weakening took place on November 27 and Sandra's circulation became devoid of convection as it diminished to a tropical storm that evening. The cyclone degenerated into a remnant low soon thereafter and ultimately dissipated just off the coast of Sinaloa, Mexico, on November 29.[36]

As the precursor to Sandra traversed Central America, it produced unseasonably heavy rainfall that triggered flooding and landslides. Four people died in various incidents related to the system: three in El Salvador and one in Honduras.[151] Initially expecting a landfalling storm, officials in Northwestern Mexico prepared equipment for power outages, closed schools, and evacuated 180 residents.[152] Sandra's effects largely consisted of light to moderate rainfall; some traffic accidents and landslides resulted from this, though the overall impacts were limited.[36][153]

Tropical Depression Nine-C[edit]

Tropical depression (SSHWS)
09C 2015-12-31 Suomi NPP.png 09-C 2015 track.png
DurationDecember 31 – December 31
Peak intensity35 mph (55 km/h) (1-min)  1001 mbar (hPa)

Despite the official end of the hurricane season about a month prior, a westerly wind burst in the equatorial waters of the Central Pacific led to the development of a tropical disturbance on December 27. Moving slowly eastward, the disturbance stayed in an environment with anomalously high sea surface temperatures and ample ocean heat content associated with the ongoing El Niño event, allowing thunderstorms in the system to develop and persist. Turning northwards, the system formed a low-level closed circulation and continued to slowly organize. At 00:00 UTC on December 31, Tropical Depression Nine-C formed at a very low latitude of 2.2°N. Moving slowly westwards, Nine-C never reached tropical storm strength due to its proximity to the equator and the presence of 20-knot vertical wind shear over the system, leaving the 2015 season one storm shy of the record from 1992. As convection in and around the depression was rapidly sheared to the west, the depression was unable to support itself and was downgraded into a remnant low at 00:00 UTC on January 1, 2016, marking the latest end to a Pacific hurricane season on record. The remnant low dissipated later that day.[10]

Storm names[edit]

The following names were used to name storms that formed in the northeastern Pacific Ocean during 2015. The names not retired from this list will be used again in the 2021 season.[154] This is the same list used in the 2009 season.

  • Andres
  • Blanca
  • Carlos
  • Dolores
  • Enrique
  • Felicia
  • Guillermo
  • Hilda
  • Rick
  • Sandra
  • Terry (unused)
  • Vivian (unused)
  • Waldo (unused)
  • Xina (unused)
  • York (unused)
  • Zelda (unused)

For storms that form in the Central Pacific Hurricane Center's area of responsibility, encompassing the area between 140°W and the International Date Line, all names are used in a series of four rotating lists.[155] The next nine names that were slated for use are shown below. Eight of these names were used throughout the course of the season. This season has seen more named storms that formed in the Central Pacific basin than any other season on record.[23]

  • Kilo
  • Loke
  • Malia
  • Niala
  • Oho
  • Pali (unused)

Operationally, Kilo was thought to have formed on August 20, and hence received a name before Loke, which formed on August 21. Kilo's date of formation was shifted to August 22 after post-analysis.[20]

Retirement[edit]

On April 25, 2016, at the 38th session of the RA IV Hurricane Committee, the World Meteorological Organization officially retired the name Patricia due to its extreme intensity and the amount of damage and deaths that it caused, and it will not be used again for another Pacific hurricane. Patricia will be replaced with Pamela for the 2021 Pacific hurricane season.[156]

Season effects[edit]

This is a table of all the storms that have formed in the 2015 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 wave, or a low, and all the damage figures are in 2015 USD.

Saffir–Simpson scale
TD TS C1 C2 C3 C4 C5
2015 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


Andres May 28 – June 4 Category 4 hurricane 145 (230) 937 Southwestern United States None None
Blanca May 31 – June 9 Category 4 hurricane 145 (230) 936 Western Mexico, Baja California Peninsula, Southwestern United States $134,000 4
Carlos June 10 – 17 Category 1 hurricane 90 (150) 978 Southwestern Mexico, Western Mexico $1.04 million None
Ela July 8 – 10 Tropical storm 45 (75) 1002 None None None
Halola July 10 – 12 Tropical storm 60 (95) 998 None None None
Iune July 10 – 13 Tropical storm 40 (65) 1004 None None None
Dolores July 11 – 19 Category 4 hurricane 130 (215) 946 Southwestern Mexico, Western Mexico, Baja California Peninsula, Southwestern United States $50 million None
Enrique July 12 – 18 Tropical storm 50 (85) 1000 None None None
Felicia July 23 – 25 Tropical storm 40 (65) 1004 None None None
Eight-E July 27 – 29 Tropical depression 35 (55) 1006 None None None
Guillermo July 29 – August 7 Category 2 hurricane 110 (175) 967 Hawaii, Northern California None None
Hilda August 6 – 14 Category 4 hurricane 145 (230) 937 Hawaii None None
Eleven-E August 16 – 17 Tropical depression 35 (55) 1003 None None None
Loke August 21 – 26 Category 1 hurricane 75 (120) 985 Hawaii None None
Kilo August 22 – September 1 Category 4 hurricane 140 (220) 940 Hawaii, Johnston Atoll None None
Ignacio August 25 – September 5 Category 4 hurricane 145 (230) 942 Hawaii, Western Canada None None
Jimena August 26 – September 10  Category 4 hurricane 155 (250) 932 None None None
Kevin August 31 – September 5 Tropical storm 60 (95) 998 Baja California Peninsula, Southwestern United States None None
Linda September 5 – 10 Category 3 hurricane 125 (205) 950 Sinaloa, Oaxaca, Zacatecas, Southwestern United States $3.59 million 22
Malia September 18 – 22 Tropical storm 50 (85) 992 Hawaii None None
Sixteen-E September 20 – 21 Tropical depression 35 (55) 1001 Baja California Peninsula, Northwestern Mexico, Southwestern United States $17.7 million 1
Niala September 25 – 28 Tropical storm 65 (100) 992 Hawaii None None
Marty September 26 – 30 Category 1 hurricane 80 (130) 987 Southwestern Mexico, Western Mexico $30 million None
Oho October 3 – 8 Category 2 hurricane 110 (175) 957 Western Canada, Alaska None None
Eight-C October 3 – 4 Tropical depression 35 (55) 1001 None None None
Nora October 9 – 15 Tropical storm 70 (110) 993 None None None
Olaf October 15 – 27 Category 4 hurricane 150 (240) 938 None None None
Patricia October 20 – 24 Category 5 hurricane 215 (345) 872 Central America, Mexico, Texas $462.8 million 8 (5)
Rick November 18 – 22 Tropical storm 40 (65) 1002 None None None
Sandra November 23 – 28 Category 4 hurricane 150 (240) 934 Central America, Baja California Peninsula, Northwestern Mexico Minor 4
Nine-C December 31 Tropical depression 35 (55) 1001 None None None
Season Aggregates
31 systems May 28 – December 31   215 (345) 872 $565 million 39 (5)  

See also[edit]

Notes[edit]

  1. ^ a b A major hurricane is one that reaches at least Category 3 status on the Saffir–Simpson scale.
  2. ^ All damage totals are in 2015 USD unless otherwise stated.
  3. ^ 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:2015 Pacific hurricane season/ACE calcs.

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