List of storms in the 2006 Pacific hurricane season

The 2006 Pacific hurricane season was the most active Pacific hurricane season since 2000 producing 19 tropical storms or hurricanes. Eighteen developed within the National Hurricane Center (NHC) area of warning responsibility, which is east of 140ºW, and one storm formed between 140ºW and the International Date Line, which is the area of responsibility of the Central Pacific Hurricane Center (CPHC). Of the 19 total storms, eleven became hurricanes, of which six attained major hurricane status. In addition to the named storms, three tropical depressions developed in each the NHC and CPHC regions of the basin.

The season officially began on May 15 in the NHC portion of the basin, and on June 1 the season began in the CPHC portion; the season officially ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the eastern Pacific basin.

Tropical activity began on May 27, when Tropical Storm Aletta formed off the southwest coast of Mexico. After no storms formed in June, the season became active in July when five named storms developed, including Hurricane Daniel which was the second-strongest storm of the season. During August, Hurricanes Ioke and John formed, as well as four other storms. September was a relatively quiet month with two storms, of which one was Hurricane Lane. Three storms developed in October and two formed in November; this marked the first time on record when more than one tropical storm developed in the basin during the month of November.

The strongest hurricane of the season was Hurricane Ioke, which reached Category 5 status on the Saffir-Simpson Hurricane Scale in the central Pacific Ocean; Ioke passed near Johnston Atoll and later near Wake Island, where it caused heavy damage but no deaths. The deadliest storm of the season was Hurricane John, which killed six people after striking the Baja California Peninsula, and the costliest storm was Hurricane Lane, which caused $203 million in damage (2006 USD) in southwestern Mexico.

Contents
Storms
Notes
Links
See also
TS Aletta
TD Two
3 Bud
1 Carlotta
4 Daniel
TS Emilia
TS Fabio
TS Gilma
2 Hector
5 Ioke
3 Ileana
4 John
1 Kristy
3 Lane
TS Miriam
TD Two-C
TD Three-C
TS Norman
TS Olivia
TD Four-C
2 Paul
TD Eighteen
TS Rosa
TD Twenty
2 Sergio
Saffir–Simpson Hurricane Scale
TD TS C1 C2 C3 C4 C5

Tropical Storm Aletta

Tropical storm (SSHS)
Duration May 27 – May 30
Intensity 45 mph (75 km/h) (1-min),  1002 mbar (hPa)
Main article: Tropical Storm Aletta (2006)

On May 27, 12 days into the season, Tropical Depression One formed about 190 miles (305 km) south of Acapulco.[1] It slowly organized and became a tropical storm with 45 mph (75 km/h) sustained winds.[1] While named tropical cyclones in May are infrequent events, Aletta marked the seventh consecutive year to have a named cyclone form in May.[2] The storm moved toward the Guerrero coast in southwestern Mexico, prompting the Mexican government to issue tropical storm watches between Punta Maldonado and Zihuatanejo.[3] Aletta then became stationary over the Guerrero and Oaxaca coastlines, but it later turned to the west and dissipated on May 30.[1]

Aletta produced moderate rainfall across Mexico, including a 24-hour rainfall total of 3.94 inches (100 mm)[nb 1] in Jacatepec, Oaxaca on May 30, and 3.78 inches (96 mm) in La Calera, Guerrero, the next day.[3] There were no reports of damage, flooding, or casualties.[1][2]

Tropical Depression Two-E

Tropical depression (SSHS)
Duration June 3 – June 5
Intensity 35 mph (55 km/h) (1-min),  1005 mbar (hPa)
Main article: Tropical Depression Two-E (2006)

On the day after Aletta dissipated, a new area of disturbed weather developed off the southwest Mexican coast. High shear slowed the development of the system, although it gained enough convection and organization to be classified as a tropical depression on June 3. The depression strengthened to near tropical storm status as it approached the coast of southwestern Mexico; however, shear persisted over the system and it weakened before dissipating on June 4.[4]

Despite never becoming a named storm, heavy rain occurred, including a total of 19.13 inches (486 mm) measured in a 48 hour period in Acapulco.[5] Mudslides and flash flooding were reported,[4] forcing 72 people from their homes.[6] No deaths or serious damage was reported.[4]

Hurricane Bud

Main article: Hurricane Bud (2006)
Category 3 hurricane (SSHS)
Duration July 11 – July 16
Intensity 125 mph (205 km/h) (1-min),  953 mbar (hPa)

On July 11, after over a month of inactivity, a disturbance off the Peninsula of Baja California developed into a tropical depression. It moved west-northwestward for its entire duration, quickly intensifying into a tropical storm and hurricane. A clear, well-defined eye developed, and Bud became the first major hurricane of the season. On July 13, the hurricane attained peak winds of 125 mph (205 km/h), although cooler waters and stable air caused a marked weakening trend. By July 15, Bud weakened to tropical depression status, and the next day it degenerated into a remnant low pressure area.[7] The remnants of Bud produced light rainfall across Hawaii.[8]

Hurricane Carlotta

Category 1 hurricane (SSHS)
Duration July 12 – July 16
Intensity 85 mph (140 km/h) (1-min),  981 mbar (hPa)
Main article: Hurricane Carlotta (2006)

Late on July 11, a new tropical depression formed about 250 miles (400 km) southwest of the Mexican state of Guerrero. The depression intensified quickly, and six hours later it was upgraded to tropical storm status, receiving the name Carlotta. The storm continued to strengthen, and became a hurricane 24 hours later. However, the system encountered unfavorable conditions and cooler waters and weakened into a tropical storm during the afternoon of July 14. Carlotta managed to regain some convection and restrengthened into a hurricane late that evening, only to weaken back into a tropical storm again the following morning. The system continued to weaken and was downgraded to tropical depression status on the morning of July 16. Carlotta degenerated into a non-convective remnant low later that night. Early in its duration, Carlotta produced light rainfall along the coast, and there were no reports of tropical storm-force winds over land. No fatalities or damages were reported.[9]

Hurricane Daniel

Category 4 hurricane (SSHS)
Duration July 16 – July 26
Intensity 150 mph (240 km/h) (1-min),  933 mbar (hPa)
Main article: Hurricane Daniel (2006)

On July 16, a tropical disturbance formed far to the south of the Baja California Peninsula and quickly increased in convective activity and organization, becoming a tropical depression. The system continued to organize and was designated as a tropical storm the next day. On July 18, Daniel attained hurricane status, and two days later underwent rapid intensification; it reached major hurricane status and was later upgraded further to Category 4 status on the Saffir-Simpson Hurricane Scale. Its peak intensity was 150 mph (240 km/h).[10] The hurricane underwent eyewall replacement cycles, which are internal mechanisms that occur in most intense hurricanes. Daniel later became an annular hurricane, which allowed it to maintain Category 4 status for longer than it otherwise would have.[11]

It crossed over into the Central Pacific early on July 24 and was predicted to affect Hawaii as a tropical storm; however, Daniel encountered weak steering currents in the open ocean, causing it to slow down considerably.[10] It rapidly degenerated to a tropical depression on July 25, and the CPHC issued its last advisory on July 26 while the storm was still well to the east of Hawaii. Its remnants later moved across the Hawaiian islands,[10] dropping heavy rainfall and causing flooding.[12] West Wailuaiki on Maui recorded 3.87 inches (98 mm) in one day, which was the highest daily rainfall total from the hurricane.[8]

Tropical Storm Emilia

Tropical storm (SSHS)
Duration July 21 – July 28
Intensity 65 mph (100 km/h) (1-min),  990 mbar (hPa)
Main article: Tropical Storm Emilia (2006)

The origins of Emilia were from a tropical wave that developed into a tropical depression on July 21, a short distance off the coast of Acapulco. It moved generally north-northwestward, reaching tropical storm status on July 22 and passing about 175 mi (280 km) southwest of Manzanillo, Colima.[13] An eyewall began to form that day,[14] and Emilia reached peak winds of 65 mph (105 km/h).[13] It briefly weakened due to wind shear, although restrengthening occurred as the storm turned toward the Baja California peninsula. On July 26, Emilia again reached peak winds of 65 mph (105 km/h), and shortly thereafter it passed about 60 mi (95 km) southwest of the southern tip of Baja California. It weakened as it turned into cooler waters, first to tropical depression status on July 27 and then to a convective-less remnant low on July 28. The remnants dissipated on July 31 about 495 mi (800 km) west-southwest of San Diego, California.[13]

In southwestern Mexico, Emilia produced tropical storm force winds along the coastline. Rainfall in the southern portion of the Baja California peninsula caused minor flooding, and gusty winds caused damage to buildings and power lines.[13] Moisture from Emilia reached the southwestern United States. Thunderstorms and rainfall occurred across Arizona, causing flooding.[15] In southern California, the storm dropped light rainfall, which assisted firefighters in containing a wildfire.[16]

Tropical Storm Fabio

Main article: Tropical Storm Fabio (2006)
Tropical storm (SSHS)
Duration July 31 – August 3
Intensity 50 mph (85 km/h) (1-min),  1000 mbar (hPa)

Tropical Storm Fabio developed from a tropical wave on July 31, about 980 miles (1,580 km) southwest of the southern tip of the Baja California peninsula. It moved steadily westward, and on August 1 Fabio reached peak winds of 50 mph (85 km/h). Later, the storm began weakening due to increased wind shear and dry air. On August 3, Fabio deteriorated to tropical depression status, and later that day it degenerated into a remnant low pressure area. The remnants continued westward toward Hawaii, moving across the state on August 7. As a tropical cyclone, Fabio did not affect land, although the remnants produced heavy rainfall across much of the state.[17] The highest rainfall total was on Mount Waiʻaleʻale on the island of Kauai, where 15.08 inches (383 mm) of rainfall fell in a 24 hour period; this 24 hour total alone was greater than all other monthly rainfall totals in the state.[18] The rainfall caused some localized flooding, although no significant damage was reported.[17]

Tropical Storm Gilma

Tropical storm (SSHS)
Duration August 1 – August 3
Intensity 40 mph (65 km/h) (1-min),  1004 mbar (hPa)

On July 17, a tropical wave exited Africa and crossed the Atlantic without developing. On July 25 it entered the Eastern Pacific, gradually developing an area of organized convection. Despite marginally favorable upper-level winds, the system organized enough to be declared a tropical depression on August 1, several hundred miles southwest of Acapulco, Mexico.[19] Moving around the western periphery of a ridge, the depression tracked west-northwestward.[20] Despite wind shear in the area,[21] the depression was upgraded to Tropical Storm Gilma later on August 1. The wind shear prevented further strengthening or organization, and Gilma weakened to a tropical depression early on August 2.[19] The depression turned westward,[22] and Gilma degenerated into a remnant low by August 4.[19]

Hurricane Hector

Main article: Hurricane Hector (2006)
Category 2 hurricane (SSHS)
Duration August 15 – August 23
Intensity 110 mph (175 km/h) (1-min),  966 mbar (hPa)

The origins of Hector, like most other storms during the season, were from a tropical wave. On August 15, a tropical depression formed off the southwest coast of Mexico, and it maintained a west-northwest track for the early part of its duration. With favorable conditions, it intensified into a tropical storm on August 16, and into a hurricane the next day. On August 18, Hector reached peak winds of 110 mph (175 km/h) over the open waters of the Pacific Ocean. The hurricane began a slow weakening trend due to wind shear and cooler waters, and as convection diminished, Hector weakened to tropical storm status on August 20. It turned to a slow west drift, and by August 23 degenerated into a remnant low pressure area. The system never affected land.[23]

Hurricane Ioke

Category 5 hurricane (SSHS)
Duration August 20 – August 27 (crossed 180° meridian)
Intensity 160 mph (260 km/h) (1-min),  915 mbar (hPa)
Main article: Hurricane Ioke

The cyclone developed from the Intertropical Convergence Zone on August 20 far to the south of Hawaii. Encountering warm waters, little wind shear, and well-defined outflow, Ioke intensified from a tropical depression to Category 4 status within 48 hours. Late on August 22 it rapidly weakened to Category 2 status before crossing over Johnston Atoll. Two days later favorable conditions again allowed for rapid strengthening, and Ioke attained Category 5 status on August 25 before crossing the International Date Line. At the time, its barometric pressure was estimated at 915 mbar, thus becoming the strongest hurricane on record in the Central Pacific.[12] As it continued westward its intensity fluctuated, and on August 31 it passed near Wake Island with winds of 155 mph (249 km/h). Ioke gradually weakened as it turned northwestward and northward, and by September 6 it had transitioned into an extratropical cyclone.[24] By then, the cyclone had lasted 19 days, reaching the equivalent of Category 5 status on the Saffir-Simpson Hurricane Scale three times.[12] The remnants of Ioke accelerated northeastward and ultimately crossed into Alaska.[25]

Ioke did not affect any permanently populated areas in the Central Pacific or Western Pacific basins as a hurricane or a typhoon. A crew of 12 people stayed in a hurricane-proof bunker on Johnston Atoll during the hurricane's passage; the crew estimated winds reached over 100 mph (160 km/h), which damaged trees on the island but did not impact the island's bird population.[12][26] The hurricane left moderate damage on Wake Island totaling $88 million (2006 USD), which resulted from blown off roofs and damaged buildings, although the infrastructure of the island was left intact. All military personnel were evacuated from the island, the first full-scale evacuation of the island since Typhoon Sarah in 1967.[27][28][29] Later, the extratropical remnants of Ioke produced a severe storm surge along the Alaskan coastline, causing beach erosion.[30]

Hurricane Ileana

Category 3 hurricane (SSHS)
Duration August 21 – August 27
Intensity 120 mph (195 km/h) (1-min),  955 mbar (hPa)
Main article: Hurricane Ileana (2006)

The origins of Hurricane Ileana were from a tropical wave that moved off the coast of Africa on August 8. It entered the Eastern North Pacific on August 16 and developed into a tropical depression on August 21 near Acapulco. The depression strengthened into Tropical Storm Ileana six hours after forming. Ileana continued to strengthen, becoming a hurricane in 24 hours and a major hurricane a day after that. Ileana reached its peak intensity of 120 mph (195 km/h) before beginning a slow weakening phase on August 24 when it encountered cooler waters. Ileana weakened a tropical depression on the morning of August 27 and quickly degenerated into a remnant low, dissipating on August 29.[31] As Ileana was heading north along the Mexican coastline, slight rainfall was recorded along the coast.[32] There were also reports of hurricane force winds on Socorro Island.[31] One fatality was reported when a man drowned in heavy surf near Cabo San Lucas.[33]

Hurricane John

Category 4 hurricane (SSHS)
Duration August 28 – September 4
Intensity 135 mph (215 km/h) (1-min),  948 mbar (hPa)
Main article: Hurricane John (2006)

On August 28, a persistent area of low pressure southwest of Acapulco, Mexico developed into a tropical depression. Later that day it strengthened into a tropical storm, and it reached hurricane strength 24 hours later on August 29. John underwent rapid intensification and reached Category 3 intensity later that day and Category 4 on August 30.[34] Hours later, the hurricane underwent another eyewall replacement cycle,[35] and subsequently weakened to Category 3 status as it paralleled the Mexican coastline a short distance offshore.[36] Potentially due to its eyewall replacement cycle or its interaction with land, Hurricane John weakened to a 105 mph hurricane by late on August 31,[37] but restrengthened to a major hurricane shortly after. It made landfall near the southern tip of the Baja California peninsula as a Category 2 hurricane on September 1.[38] John continued northwestward along the eastern Baja California peninsula, weakening to tropical depression status by September 3 and dissipating on September 4 in the Gulf of California.[34]

Along the southwestern coast of Mexico, Hurricane John produced heavy surf, strong winds, and heavy rainfall, which flooded roads, caused mudslides, and downed trees.[34][39] Along the Baja California Peninsula, the hurricane dropped heavy rainfall, with a 24-hour peak of 10.8 inches (276 mm) in Los Planes.[40] The heavy rainfall caused flooding, closed roads,[41] and caused a dam to overflow.[42] The winds and rainfall destroyed thousands of flimsy houses across the region.[43] Across Mexico, five people were killed,[34] and damage amounted to $663 million (2006 MXN, $60.8 million 2006 USD).[44] Moisture from the remnants of John produced flooding across Texas, which closed a ½ mile (800 m) portion of Interstate 10 in El Paso.[45] In southern New Mexico, the rainfall caused widespread street flooding and some minor damage.[46] Tropical moisture from the storm also produced rainfall in Arizona and southern California, where eight separate mudslides occurred, trapping 19 vehicles but causing no injuries.[47]

Hurricane Kristy

Main article: Hurricane Kristy (2006)
Category 1 hurricane (SSHS)
Duration August 30 – September 8
Intensity 80 mph (130 km/h) (1-min),  985 mbar (hPa)

On August 30, a tropical wave located about 525 miles (850 km) south-southwest of Baja California became more organized and was designated as the twelfth tropical depression of the 2006 season. It strengthened into Tropical Storm Kristy and became Hurricane Kristy the next day. It did not retain this status for long, partly due to its proximity to Hurricane John.[48] There was a possibility of a Fujiwhara interaction between both systems, causing Kristy to weaken or perhaps be absorbed into the circulation of John.[49] This did not occur, however. Kristy weakened steadily after its peak intensity and looked to be close to dissipating, but on September 3 and again on September 5, convection flared up and it returned to tropical storm strength.[48] After oscillating between storm and depression strength, the system degenerated into a remnant low on September 7, which dissipated on September 8 without affecting land.[48]

Hurricane Lane

Category 3 hurricane (SSHS)
Duration September 13 – September 17
Intensity 125 mph (205 km/h) (1-min),  952 mbar (hPa)
Main article: Hurricane Lane (2006)

On September 13, a tropical disturbance located about 125 miles (200 km) west-southwest of Acapulco, Mexico, gradually became better organized and was designated the thirteenth tropical depression of the 2006 season. The depression intensified in a favorable environment, and was upgraded to Tropical Storm Lane later that night. As it moved parallel to the Mexican coast it continued to strengthen and became a hurricane on September 15, and a major hurricane early the next day. Hurricane Lane reached peak winds of 125 mph (205 km/h) before it made landfall on the coast of Sinaloa on September 16. It quickly weakened over land and dissipated on September 17.[50]

Tropical Storm Lane produced heavy rainfall and high seas along the west coast of Mexico, including Acapulco where flood waters reached 16 inches (40 cm) in depth. The Acapulco airport also experienced flooding, though service was not interrupted.[51] Throughout Mexico, the hurricane caused four deaths and $2.2 billion (2006 MXN, $203 million 2006 USD) in damage,[52] half of which in Sinaloa where heavy crop damage was reported.[53] An estimated 4,320 homes were affected by the hurricane, and 19,200 miles (30,000 km) of roads and highways were damaged to some degree, including some destroyed bridges.[52]

Tropical Storm Miriam

Tropical storm (SSHS)
Duration September 16 – September 18
Intensity 45 mph (75 km/h) (1-min),  999 mbar (hPa)

A disturbance associated with a northerly extension of the Intertropical Convergence Zone and a tropical wave developed a closed circulation on September 15. It moved northeastward due to the influence from nearby Hurricane Lane, and organized enough to be declared Tropical Depression Fourteen-E on September 16 while located about 500 miles southwest of Cabo San Lucas, Mexico. It quickly strengthened, and organized into Tropical Storm Miriam later that day. After reaching a peak intensity of 45 mph (70 km/h), vertical wind shear and cooler waters rapidly weakened the storm, and the circulation decoupled from the convection on September 17. After turning more towards the north, Miriam weakened to tropical depression status, and on September 18 it degenerated to a remnant low. The remnant circulation turned to the northwest, then to the east, and dissipated on September 21 a short distance west of Baja California. No deaths are damage are associated with Miriam, and only one ship recorded winds of over tropical storm force near the center.[54]

Tropical Depression Two-C

Tropical depression (SSHS)
Duration September 18 – September 20
Intensity 35 mph (55 km/h) (1-min),  1007 mbar (hPa)

On September 18, an area of disturbed weather associated with the Intertropical Convergence Zone became sufficiently organized to be designated Tropical Depression Two-C. Initially, it was thought that the depression formed from the remnants of Hurricane Kristy, although subsequent analysis confirmed they were two separate systems. Initially, the depression was in an area of favorable conditions, with little wind shear and warm waters.[12] As a result, the CPHC predicted significant strengthening to at least hurricane status.[55] Instead, a high pressure system to its north increased wind shear over the depression, causing the convection to become removed from the center. The depression weakened into a remnant low on September 20, never reaching tropical storm status.[12]

Tropical Depression Three-C

Tropical depression (SSHS)
Duration September 26 – September 27
Intensity 35 mph (55 km/h) (1-min),  1007 mbar (hPa)

During September, El Niño conditions became established across the Pacific, which produced an area of warmer waters along the International Date Line. A few days after Tropical Depression Two-C dissipated, another area of disturbed weather formed, and although it was disorganized, it was also persistent. The CPHC initiated advisories on Tropical Depression Three-C on September 26 after a circulation was evident in the system. Strong wind shear prevented any development, and the system dissipated on September 27.[12]

Tropical Storm Norman

Tropical storm (SSHS)
Duration October 9 – October 15
Intensity 50 mph (85 km/h) (1-min),  1000 mbar (hPa)
Main article: Tropical Storm Norman (2006)

Early in October, a low pressure system began to organize to the west of the Mexican coast, and on October 9 it developed into Tropical Depression Fifteen-E. It strengthened into a tropical storm the next day, but strong wind shear and low sea-surface temperatures hindered development. Norman slowly began to weaken, and on October 11 it degenerated into a remnant low pressure area. Turning eastward, the system combined with a new tropical disturbance off the southwest Mexican coast, and slowly began to reorganize. The system was re-designated a tropical depression on October 15 just south-southeast of Manzanillo, Colima, although within a few hours it again dissipated.[56]

The storm brought heavy rainfall to southwestern Mexico, peaking at 6.35 inches (161 mm) in La Villita, Michoacán.[57] The rainfall caused flooding and mudslides around Acapulco, affecting 170 homes, of which 20 were destroyed.[58][59] About 300 hectares (740 acres) of crop fields sustained damage.[59] Initially there were two people missing;[59] however, a subsequent report indicated there were no casualties associated with the storm.[56]

Tropical Storm Olivia

Tropical storm (SSHS)
Duration October 9 – October 12
Intensity 45 mph (75 km/h) (1-min),  1000 mbar (hPa)

On September 18, a tropical wave exited Africa and later crossed into the eastern Pacific on September 29 without development. Convection increased in the Pacific along the wave axis, spawning a broad low pressure area on October 5. Despite the presence of wind shear, it organized enough for the NHC to initiate advisories on Tropical Depression Sixteen-E on October 9 about 1,360 miles (2,190 km) to the west-southwest of the southern tip of Baja California.[60] Influenced by a high pressure system, the depression drifted northward.[61] Six hours after being upgraded to a tropical storm, Olivia attained peak winds of 45 mph (75 km/h),[60] although the convection was limited to its northern side due to wind shear.[62] On October 11, the convective activity diminished and Olivia weakened to tropical depression status.[63] Olivia deteriorated into a remnant low on October 13. It moved towards the east-southeast, and on October 15 was absorbed into the remnants of Tropical Storm Norman. Olivia never affected land.[60]

Tropical Depression Four-C

Tropical depression (SSHS)
Duration October 13 – October 14
Intensity 35 mph (55 km/h) (1-min),  1007 mbar (hPa)

In the middle of October, the Intertropical Convergence Zone extended across the central Pacific Ocean, resembling an extension of the monsoon trough. An area of disturbed weather formed well to the southwest of Hawaii, organizing slowly for several days. Late on October 13, after the development of a low-level circulation and persistent convection, the CPHC classified the system as Tropical Depression Four-C about 750 mi (1,200 km) southwest of Honolulu, Hawaii. Upon being classified, the depression was located in an unusual steering flow that caused it to track eastward. Due to the approach of an upper-level trough, it was expected to dissipate quickly from wind shear, although forecasters noted the possibility for the trough to provide an outflow channel, which might allow strengthening.[64] On October 14, strong wind shear removed the convection completely from the center, and the system degenerated into a remnant low.[12]

The remnant circulation continued slowly eastward, dissipating on October 16. Concurrently, the convection tracked northeastward ahead of the upper-level trough, which contributed to heavy rainfall and flooding on the island of Hawaii on October 17.[12] The rainfall event coincided with an earthquake striking the area.[65]

Hurricane Paul

Category 2 hurricane (SSHS)
Duration October 21 – October 26
Intensity 105 mph (165 km/h) (1-min),  970 mbar (hPa)
Main article: Hurricane Paul (2006)

Hurricane Paul developed from an area of disturbed weather on October 21, and slowly intensified as it moved into an area of warm waters and progressively decreasing wind shear. Paul attained hurricane status on October 23, and later that day it reached its peak intensity of 105 mph (165 km/h), a strong Category 2 hurricane on the Saffir-Simpson scale. A strong trough turned the hurricane to the north and northeast into an area of strong vertical shear, and Paul weakened to a tropical storm on October 24, later passing just south of the Baja California Peninsula. Paul weakened to a tropical depression on October 25 a short distance off the coast of Mexico, and after briefly turning away from the coast it made landfall on northwestern Sinaloa on October 26.[66]

Paul was the third hurricane to threaten western Mexico in the season, the others being Hurricanes John and Lane. Rough surf killed two people along Baja California Sur,[67] while two deaths from flooding were reported in Sinaloa.[68] Paul dropped moderate rainfall across mainland Mexico, including a 24-hour total of 2.28 inches (58 mm) in Mazatlán, Sinaloa.[69] Damage totaled more than $35 million (2006 MXN, $3.2 million 2006 USD).[70]

Tropical Depression Eighteen-E

Tropical depression (SSHS)
Duration October 26 – October 27
Intensity 35 mph (55 km/h) (1-min),  1007 mbar (hPa)

The origins of Tropical Depression Eighteen-E were from a tropical wave that exited the coast of Africa on October 7. It briefly spawned a low-pressure area as the wave continued westward without development. On October 20, the wave entered the Pacific Ocean, developing an area of thunderstorms about four days later. By 1200 UTC on October 26, a tropical depression formed about 155 mi (260 km) south of Manzanillo.[71] Initially, Tropical Depression Eighteen-E was located in an area of light wind shear, and the NHC anticipated further organization and strengthening to near hurricane status.[72] The tropical depression initially maintained a steady westward motion away from the Mexican coastline, due to a ridge north of the cyclone.[72] By October 17, convection had decreased, and the depression was not forecast to intensify as much.[73] Possibly due to intrusion of dry air, the circulation became exposed from the thunderstorms, and having weakened, it turned to a southward drift.[74] By 0000 UTC on October 28, the system had weakened to a non-convective remnant low, which dissipated the following day.[71]

Tropical Storm Rosa

Tropical storm (SSHS)
Duration November 8 – November 10
Intensity 40 mph (65 km/h) (1-min),  1002 mbar (hPa)

A tropical wave exited western Africa on October 22 and continued westward into the Pacific on November 2, spawning a tropical depression on November 8 about 440 mi (710 km) south of Manzanillo, Colima.[75] Environmental conditions appeared favorable,[76] although wind shear removed the convection from the circulation.[77] Throughout its duration, the storm maintained a northwest track through a weakness in a subtropical ridge.[78] By November 9, a new area of convection persisted near the center,[79] and a banding feature formed.[78] Despite the shear, the depression was upgraded to Tropical Storm Rosa, although the shear prevented intensification beyond its peak of 40 mph (65 km/h).[75] Rosa remained a tropical storm for only 18 hours, becoming a tropical depression early on November 10 and dissipating later that day.[75] Rosa was the first tropical storm in the basin to develop during November since 2000, and was also the first tropical depression to form in the month since 2002's Tropical Depression Sixteen-E. No impact was reported from the storm.[75]

Tropical Depression Twenty-E

Tropical depression (SSHS)
Duration November 11 – November 11
Intensity 35 mph (55 km/h) (1-min),  1007 mbar (hPa)

A tropical wave moved off the western coast of Africa on October 21, briefly developing two weak low pressure areas before the wave crossed into the Pacific Ocean on November 1. Thunderstorm activity slowly increased as the wave interacted within the Intertropical Convergence Zone. After a curved band of convection developed, it is estimated the system formed into Tropical Depression Twenty-E around 0000 UTC on November 11, about 550 mi (1,050 km) southwest of Manzanillo. Throughout its duration, the depression never completely separated from the Intertropical Convergence Zone.[80] When the NHC issued its first advisory on the depression, the agency predicted slight intensification to tropical storm status and for the depression to last at least two days. This was due to a forecast of gradually increasing wind shear after the first 24 hours.[81] Instead, the circulation became very elongated; it is estimated the cyclone degenerated into a trough by late on November 11.[80]

Hurricane Sergio

Category 2 hurricane (SSHS)
Duration November 13 – November 20
Intensity 110 mph (175 km/h) (1-min),  965 mbar (hPa)
Main article: Hurricane Sergio (2006)

Just days after Tropical Depression Twenty-E degenerated into an open trough, Tropical Depression Twenty One-E developed from a tropical wave on November 13 about 460 miles (740 km) south of Manzanillo, Colima. It steadily intensified as it tracked southeastward, reaching peak winds of 110 mph (175 km/h) on November 15. Subsequently it began to weaken due to increased wind shear as it turned to the north. Sergio later turned to the west, remaining well off the coast of Mexico, and it dissipated on November 20 about 320 miles (515 km) west-northwest of where it originally formed.[82]

Sergio produced light rainfall along the coast of Mexico, though its effects were minimal.[83] The formation of Sergio marked the 2006 season as the most active in 12 years and the first season in which more than one tropical storm formed in November. Sergio set records for the month of November in the basin, becoming the second strongest hurricane, after Kenneth from 2011 as well as the longest-lived November Pacific tropical cyclone with a duration of seven days.[82][84]

Accumulated Cyclone Energy (ACE) Rating

ACE (104kt2) — Storm:[84]
1 (34.2) Ioke 8   6.80 Lane 14   1.13 Aletta
2 27.3
(2.25)		 Daniel 9   6.06 Paul 15   0.970 Miriam
3 18.3 John 10   6.03 Carlotta 16   0.768 Norman
4 12.1 Ileana 11   4.75 Kristy 17   0.725 Olivia
5 12.0 Hector 12   4.58 Emilia 18   0.368 Gilma
6   8.98 Bud 13   1.34 Fabio 19   0.368 Rosa
7   8.00 Sergio 14   1.13 Aletta
Total: 120 (36.5)

The table on the right shows the ACE for each storm in the season. ACE is, broadly speaking, a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. ACE is only calculated for full advisories on tropical systems at or exceeding 34 knots (39 mph, 63 km/h), or tropical storm strength. The figures in parenthesis are for storms in the Central Pacific basin west of 140°W; those not in parentheses are for the Eastern Pacific basin.

The cumulative ACE for the Eastern Pacific this season fell within the official "Near Normal" grading, even though the number of tropical storms, hurricanes, and major hurricanes was above the long term average.[85]

See also

Notes

  1. ^ Rainfall totals are rounded to the nearest 1/100th of an inch and to the nearest millimetre.

References

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External links

Tropical cyclones of the 2006 Pacific hurricane season

List of storms · Timeline
Saffir–Simpson Hurricane Scale
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