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{{TC stats cyclone3|cat=depression|name=Eight-E|dates=August 31 – September 1|max-winds=35 (55)|min-press=1002|areas=Southwestern Mexico, Western Mexico ('''[[Michoacán]]''')|damage=None|deaths=0}}
{{TC stats cyclone3|cat=depression|name=Eight-E|dates=August 31 – September 1|max-winds=35 (55)|min-press=1002|areas=Southwestern Mexico, Western Mexico ('''[[Michoacán]]''')|damage=None|deaths=0}}
{{TC stats cyclone3|cat=cat4|name=[[Hurricane Hilary (2011)|Hilary]]|dates=September 21 – September 30|max-winds=145 (230)|min-press=940|areas=Southwestern Mexico|damage=N/A|deaths=0}}
{{TC stats cyclone3|cat=cat4|name=[[Hurricane Hilary (2011)|Hilary]]|dates=September 21 – September 30|max-winds=145 (230)|min-press=940|areas=Southwestern Mexico|damage=N/A|deaths=0}}
{{TC stats cyclone3|cat=cat3|name=Jova|dates=October 5 – currently active|max-winds=125 (205)|min-press=955|areas=Southwestern Mexico|damage=N/A|deaths=0}}
{{TC stats cyclone3|cat=cat3|name=Jova|dates=October 5 – currently active|max-winds=125 (205)|min-press=955|areas=Southwestern Mexico, '''Western Mexico'''|damage=N/A|deaths=0}}
{{TC stats cyclone3|cat=cat1|name=Irwin|dates=October 5 – currently active|max-winds=90 (150)|min-press=977
{{TC stats cyclone3|cat=cat1|name=Irwin|dates=October 5 – currently active|max-winds=90 (150)|min-press=977
|areas=None|damage=None|deaths=0}}
|areas=None|damage=None|deaths=0}}
{{TC stats cyclone3|cat=depression|name=Twelve-E|dates=October 12 – currently active|max-winds=35 (55)|min-press=1005
{{TC stats cyclone3|cat=depression|name=Twelve-E|dates=October 12 – currently active|max-winds=35 (55)|min-press=1005
|areas=Southern Mexico|damage=None|deaths=0}}
|areas=Southwestern Mexico|damage=None|deaths=0}}
{{TC stats table end3|num-cyclones=11|dates=June 7 – Season in progress|max-winds=155 (250)|min-press=929|tot-areas=|tot-damage=0|tot-deaths=4}}
{{TC stats table end3|num-cyclones=11|dates=June 7 – Season in progress|max-winds=155 (250)|min-press=929|tot-areas=|tot-damage=0|tot-deaths=4}}
</center>
</center>

Revision as of 12:07, 12 October 2011

2011 Pacific hurricane season
Season summary map
Seasonal boundaries
First system formedJune 7, 2011
Last system dissipatedSeason currently active
Strongest storm
NameDora
 • Maximum winds155 mph (250 km/h)
 • Lowest pressure929 mbar (hPa; 27.43 inHg)
Seasonal statistics
Total depressions12
Total storms10
Hurricanes9
Major hurricanes
(Cat. 3+)		5
Total fatalities4 total
Total damageUnknown
Related article
Pacific hurricane seasons
2009, 2010, 2011, Post-2011

The 2011 Pacific hurricane season is an ongoing, annual cycle of tropical cyclone formation. The season officially started on May 15, 2011, for the eastern Pacific, and started on June 1, 2011, for the central Pacific, both of which will end on November 30, 2011. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin. However, the formation of tropical cyclones is possible at any time. The first storm, Adrian, became one of only a handful of tropical cyclones to attain Category 4 status in June. Three other storms, Dora, Eugene, and Hilary attained Category 4 status. The first half of September had very little activity, due to the return of a La Niña event. Tropical Depression Eight-E was the only storm in the first half of September, when it dissipated on September 1. Hilary became the second storm to form in September, becoming the 4th Category 4 hurricane (and the 4th major hurricane of the season), during the afternoon hours of September 22.

Seasonal forecasts

Predictions of tropical activity in the 2011 season
Source Date Named
storms		 Hurricanes Major
hurricanes		 Ref
Average (1981–2010) 15.6 8.6 4.1 [1]
Average (1995–2010) 14 7 3 [2]
Record high activity 27 16 (Tie) 10
Record low activity 8 (Tie) 3 0 (Tie)
–––––––––––––––––––––––––––––––––––––––––––––––––––––––
NOAA May 19, 2011 9–15 5–8 1–3 [2]
–––––––––––––––––––––––––––––––––––––––––––––––––––––––
Current activity
(As of September 14)		 10 9 5

On May 19, the Climate Prediction Center released its pre-season outlook. The scientists stated a 70% chance of a below-normal season, a 25% chance of a near-normal season and a 5% chance of an above-normal season. The climatologists expected 9-15 named storms, with 5-8 becoming hurricanes, and 1-3 becoming major hurricanes. The accumulated cyclone energy was expected to be 45 to 105% of the median. The below-normal activity forecast was because of increased wind shear and a high expectation of ENSO-neutral conditions (no El Niño or La Niña) throughout the peak months of July, August and September, together with lingering La Niña conditions at the beginning of the season. However, as of early October, there have already been ten named storms, nine hurricanes and five major hurricanes.[3]

Season summary

On May 31 a tropical wave moved off the coast of El Salvador. On June 7, it developed into Tropical Depression One-E. It became Hurricane Adrian on June 9, and reached a peak intestity of 946 mbar as a Category 4 hurricane.[4] About a fortnight later, on June 19, Tropical Depression Two-E formed. It strengthened into Hurricane Beatriz and went dangerously close to the coast of southern Mexico, killing 3.[5] It later dissipated. On July 7, Tropical Depression Three-E formed. It later strengthend into a Category 1 hurricane and was named Calvin. On July 14, a tropical wave moved off Colombia into the Pacific Ocean. By June 18, it was Tropical Storm Dora. By July 21, Dora was a strong Category 4[6] major hurricane with winds of 155 mph, making it 1 mph too weak for a Category 5 hurricane. It had pressure of 929 mbar. On July 31, Tropical Storm Eugene formed and eventually strengthened into a Category 4 storm.[7] It dissipated on August 6. Tropical Storm Fernanda formed on August 15 and moved west. Meanwhile, on August 16, Tropical Depression 7-E formed. It strengthened and eventually attained hurricane strength, and was called Greg. Fernanda dissipated on August 20, a day before the dissipation of Greg. Tropical Depression Eight-E formed on August 31 and dissipated the next day. Hurricane Hilary formed on September 21 and strengthened into a hurricane on September 22. On October 5, Tropical Depression Ten-E and Tropical Depression Eleven-E both formed. Eleven-E later strengthened into Tropical Storm Irwin, closely followed by Ten-E growing into Tropical Storm Jova.

Storms

Hurricane Adrian

Category 4 hurricane (SSHWS)
 
DurationJune 7 – June 12
Peak intensity140 mph (220 km/h) (1-min);
944 mbar (hPa)

Late on May 31, a tropical wave moved off the coast of El Salvador, and into the Pacific Ocean.[8] On June 2, the tropical wave developed a well-defined area of low pressure, which produced disorganized weather, several hundred miles from the Pacific coast of Mexico.[9] By June 7, the low developed sufficiently organized deep convection to be classified as a tropical cyclone, and the National Hurricane Center (NHC) designated it as Tropical Depression One-E at 1500 UTC, about 365 mi (590 km) south of Acapulco. Upon developing, the depression was located over warm sea surface temperatures, and upper-level wind shear in its vicinity was forecast to remain conducive for intensification.[10] Caught in weak steering currents, the system further organized while moving little; it was upgraded to Tropical Storm Adrian later that day, with winds of 60 mph (95 km/h).[11] Briefly caught within light steering winds, Adrian tracked toward the north-northwest.[11] Adrian also began exhibiting an eye-like feature, indicating strengthening is present.[12] By nightfall, the eye-like feature developed into a central dense overcast, a large mass of deep convection, (CDO), and at around 0300 UTC on June 9, the NHC upgraded Adrian to a minimal hurricane as it attained sustained winds of 80 mph (130 km/h).[13] Adrian rapidly deepened, and over the following 24 hours, it is estimated by satellite observations that winds increased from 80 mph (120 km/h) to 140 mph (240 km/h) and its barometric pressure decreased by 43 mbar (hPa; 1.27 inHg), going from a category 1 to a category 4 hurricane on the Saffir–Simpson Hurricane Scale (SSHS).[14][15] Throughout most of June 9, Adrian began transitioning into a annular hurricane, displaying an large eye around 25 miles (40 km) in diameter, circular in shape, and devoid of any convective banding.[16] Adrian continued to intensity, reaching its peak intensity at around 0300 UTC on June 10 while located about 320 mi (515 km) south-southwest of Manzanillo, Mexico.[17]

When Adrian peaked, it had maximum sustained winds of 140 mph (220 km/h) and a barometric pressure estimated at 944 mbar (hPa; 27.88 inHg).[15] During late that morning, convection associated with the Adrian had lessened and cloud tops warmed.[18] Shorly therafter, Adrian also began moving into a more stable environment with cooler sea surface temperatures and stronger westerly wind shear.[19] By June 11, Adrian's eye completely disappeared on satellite imagery, and it no longer maintained its symmetrical structure.[20] Steered by a low-to-mid-level ridge over the northeastern Pacific, Adrian recurved to the west, traversing sea surface temperatures cooler than 26.5 °C (79.7 °F).[20][21] Around 1500 UTC on June 11, Adrian weakened back into a tropical storm.[22] Soon enough, that evening, Adrian degenerated into a tight swirl of low-level clouds. [23] Intermittent bursts of deep convection kept satellite intensity estimates at 45 mph (65 km/h);[24] Adrian still degenerated into a tropical depression six hours later,[25] and subsequently decaying into a remnant low-pressure area without convection, at around 1500 UTC on June 12 while located about 585 mi (940 km) southwest of the southernmost tip of Baja California, even as the system was accelerating to the north-northwest, while rapidly weakening.[26][27] But Adrian's remnants still had a slim chance to redevelop, as it began to move southward, while it was located southwest of the Baja California Peninsula. But as Adrian's remnants remained stationary, it slowly weakened. The possibility of Adrian redeveloping disappeared, as wind shear drastically increased, rapidly destroying the remnants of Adrian.[28] During the late afternoon of June 13, the remnants of Hurricane Adrian dissipated completely, due to the strong wind shear.[29] The outer rainbands of Hurricane Adrian brought widespread rainfall in Mexico.[30]

Hurricane Beatriz

Main article: Hurricane Beatriz (2011)
Category 1 hurricane (SSHWS)
 
DurationJune 19 – June 22
Peak intensity90 mph (150 km/h) (1-min);
977 mbar (hPa)

By June 14, the NHC noted a large area of scattered showers and thunderstorms associated with a monsoon trough over the east Pacific, several hundred miles from the coast of Acapulco, Mexico.[31][32] A quasi-stationary surface low formed in association with the activity, and over the subsequent days convection consolidated in the vicinity of an anticyclone over the southwestern Caribbean.[33][34] Curved rainbands began developing around the center, and on June 19 the system acquired sufficient organization to be classified as a tropical depression. Turning toward the northwest along a weakness in the subtropical ridge to its north, the depression further strengthened within a favorable environment and was upgraded to Tropical Storm Beatriz at 1800 UTC that day, with winds of 40 mph (65 km/h).[35][36] Late on June 20, Beatriz was upgraded to a hurricane, with winds of 75 mph (121 km/h) and a pressure of 985 mbar (29.1 inHg). Beatriz continued to strengthen and reached winds of 90 mph (140 km/h) and a pressure reading of 977 mbar (28.9 inHg) while it neared the coast of Mexico. After moving along the coast, it weakened to a tropical storm and dissipated the next day. But the NHC noted that Beatriz's remnants still had a near 0% chance of redeveloping, as they remained almost stationary.[37] But on June 23, convection dissipated, and Beatriz's remnants slowly began to accelerate to the west, as the remnant low dissipated rapidly. Late on June 24, the remnants of Hurricane Beatriz dissipated completely, to the southwest of the Baja California Peninsula.[38]

Hurricane Calvin

Category 1 hurricane (SSHWS)
 
DurationJuly 7 – July 10
Peak intensity80 mph (130 km/h) (1-min);
984 mbar (hPa)

On July 5, an area of showers and thunderstorms formed south of the Gulf of Tehuantepec associated with a broad area of low pressure.[39] The system slowly organized, and the National Hurricane Center designated the system Tropical Depression Three-E on July 7. Around 8 p.m. PDT (0300 UTC July 8) that night, the tropical depression gained enough organization to be named Calvin. Calvin strengthened into a hurricane and attained peak strength late on July 8 before rapidly weakening on July 9. Calvin degenerated into a remnant low early on July 10.[40] During the next 3 days, Calvin's remnants moved rapidly to the west, while dissipating fast. On July 13, Calvin's remnants dissipated completely, just east of the Central Pacific Ocean.[41]

Hurricane Dora

Category 4 hurricane (SSHWS)
 
DurationJuly 18 – July 24
Peak intensity155 mph (250 km/h) (1-min);
929 mbar (hPa)
Main article: Hurricane Dora (2011)

In the early morning hours of July 14, a tropical wave had moved off the Colombian coast.[42] The wave gained convection as it moved into the Southwestern Caribbean Sea, and the National Hurricane Center (NHC) began to monitor the disturbance, giving it a 10% chance of development into a tropical cyclone.[43] Over the rest of the day, the storm continued to move westward until it moved ashore on the Nicaragua/Costa Rica border the next day.[44] On July 16, the National Hurricane Center began monitoring the area of low pressure off the coast of Guatemala. Slowly organizing, the low pressure area had gained enough strength to be declared Tropical Depression Four-E during the morning hours of July 18.[45] Just three hours later, the system was upgraded to Dora, the fourth tropical storm of the 2011 Pacific hurricane season.[46] Continuing to organize, Dora reached hurricane strength late on July 20,[47] before rapidly intensifying into a major hurricane later the next day. Strengthening further, Dora reached a peak of 155 mph (250 km/h) early on July 21, making it a Category 4 hurricane on the Saffir-Simpson hurricane scale. However, after entering cooler waters, Dora began to weaken the next day. On July 23, Dora was downgraded to a tropical storm, and the next day, Dora was no longer a tropical cyclone.[48] As a remnant low, the circulation began to curve around the high-pressure area that had steered Dora for much of its existence on July 25.[49] Early on July 26, the remnants of Hurricane Dora dissipated completely, over Central Baja California.[50]

Hurricane Eugene

Category 4 hurricane (SSHWS)
 
DurationJuly 31 – August 6
Peak intensity140 mph (220 km/h) (1-min);
942 mbar (hPa)

On early July 31, a tropical wave developed into a tropical depression in the eastern Pacific a few hundred miles south of Mexico. Meteorologists numbered it "Five-E". It was upgraded to Tropical Storm Eugene only 6 hours after becoming a tropical depression. On the afternoon of August 1, Eugene strengthened into a Category 1 hurricane on the Saffir-Simpson Hurricane Scale. The next day Eugene further strengthened into a Category 2 hurricane. Early on August 3 Eugene further strengthened into a Category 3 hurricane, making it the third major hurricane of the season. Eugene was expected to weaken after becoming a Category 3. However, on the afternoon of August 3, Eugene strengthened into a Category 4 hurricane on the Saffir-Simpson Hurricane Scale with winds up to 140 mph (220 km/h). Eugene only maintained Category 4 status briefly, and only six hours later, the hurricane weakened to a Category 3 with winds up to 125 mph (200 km/h). Eugene quickly weakened on August 5 because of unfavorable conditions, dropping from Category 2 status to tropical storm status in only 18 hours. On August 6, Eugene became a post-tropical low as the center of the storm was void of strong convection.[51] During the next few days, Eugene's remnants continued to move westward slowly, while weakening gradually. On August 10, the remnants of Hurricane Eugene dissipated roughly 980 mi (1,555 km) east of Hawaii.[52]

Tropical Storm Fernanda

Tropical storm (SSHWS)
 
DurationAugust 15 – August 20
Peak intensity65 mph (100 km/h) (1-min);
994 mbar (hPa)

During the afternoon hours on August 13 an area with a group of thunderstorms associated with an area of low pressure formed over the open Pacific. While shower activity was initially limited, the National Hurricane Center upgraded it to Tropical Depression Six-E on August 15, and then to Tropical Storm Fernanda on August 16. During the early hours on August 18 Fernanda crossed 140th meridian west into the Central Pacific Ocean. Fernanda later weakened to a post-tropical cyclone on August 20.[53] During the next 2 days, Fernanda's remnants moved westwards, passing just to the south of Hawaii. Soon afterwards, the remnants moved to the west of Hawaii. Early on August 23, the remnants of Tropical Storm Fernanda dissipated completely, to the southwest of the Big Island of Hawaii.[54]

Hurricane Greg

Category 1 hurricane (SSHWS)
 
DurationAugust 16 – August 21
Peak intensity85 mph (140 km/h) (1-min);
980 mbar (hPa)

On the afternoon of August 16, a vigorous area of low pressure area developed into Tropical Depression Seven-E. It was upgraded to Tropical Storm Greg 12 hours later. The storm steadily intensified over 85 °F (29 °C) sea surface temperatures; it reached hurricane status late on August 17 with winds up to 75 mph. Hurricane Greg continued strengthening to attain peak winds of 85 mph and 980 millibars in pressure. Soon afterward, Greg started gradually weakening due to cooler waters and moderate wind shear, and on August 19, Greg weakened back down to tropical storm strength, with winds of 65 mph. Tropical Storm Greg continued weakening as shear as waters cooled, and on August 20 Greg weakened to a tropical depression. Greg maintained its intensity until August 21, when Greg degenerated into a remnant low.[55] During that day, Greg's remnants moved northeastward due to a High Pressure System. From late on August 22, until the early afternoon of August 23, Greg's remnants impacted southern California, bringing cloudly weather, even though the center of circulation itself moved southeastward, slowly, and was positioned far southwest of Southern California.[56] Greg's remnants continued to drift westwards, as it rapidly weakened. Late on August 24, the remnants of Hurricane Greg dissipated completely, far west of the southern tip, of the Baja California Peninsula.[57]

Tropical Depression Eight-E

Tropical depression (SSHWS)
 
DurationAugust 31 – September 1
Peak intensity35 mph (55 km/h) (1-min);
1002 mbar (hPa)

The National Hurricane Center (NHC) began monitoring an area of disturbed weather southwest of the Mexican Riviera. Initially, poorly organized, environmental conditions were conductive for some development.[58] Shortly thereafter, the cloud patterns improved and overall thunderstorm activity increased.[59] Thunderstorm activity become more concentrated two days later while located 60 mi (97 km) south of Zinhuatnejo, and the NHC noted that the disturbance could become a tropical depression within hours.[60] This held true, and at 1500 UTC August 31, the low was upgraded into a tropical depression, but no further intensification was anticipated.[61] Eight-E soon made landfall on Southwestern Mexico, and moved north-northwestwards, as it rapidly weakened. Eight-E dissipated to a remnant low several hours later, early on September 1. [62] However, the remnants of Tropical Depression Eight-E survived, and they as they began moving westward, the remnants impacted Western Mexico. During the early afternoon of September 1, the remnants of Eight-E moved off the western coast of Western Mexico. During the next day, the remnants strengthened slightly in intensity, as it moved northwestward, towards the Baja California Peninsula. But late on September 2, the remnants of Tropical Depression Eight-E dissipated completely, just southeast of Baja California. [63]

Hurricane Hilary

Category 4 hurricane (SSHWS)
 
DurationSeptember 21 – September 30
Peak intensity145 mph (230 km/h) (1-min);
940 mbar (hPa)
Main article: Hurricane Hilary (2011)

On September 18, a broad area of low pressure associated with minimal shower and thunderstorm activity began to show signs of organization, while located several hundred miles to the south-southeast of the Gulf of Tehuantepec. [64] Moving towards the west, and west-northwest, the disturbance gained enough organization early on September 21 to be declared as a tropical depression, the ninth of the season. Continuing to organize, the depression strengthened into a tropical storm several hours later. On September 22, the meteorologists declared Hilary as a Category 1 hurricane, becoming the seventh of the season. On September 22, it rapidly strengthened into a small, Category 4 hurricane, featuring a well-defined eye and very deep convection.

At 00:00 UTC September 23 (8:00 p.m. AST September 22), Hilary was upgraded into a major hurricane, the fourth of the season. Continuing to rapidly strengthen, Hilary became a Category 4 hurricane just a few hours later after becoming a Category 3, and reached a peak intensity of 145 mph (235 km/h) at 0600 UTC September 23 (11 p.m. AST September 22). However, the storm began to enter an area of higher wind shear and cooler ocean temperatures on September 24, and Hilary began to weaken. The hurricane weakened back down to a Category 3 hurricane early on September 25, but was later upgraded briefly to a Category 4 again the following afternoon.[65][66] Several hours later, the storm was once again downgraded into a Category 3 hurricane, and during the afternoon hours of September 27, Hilary was further downgraded into a Category 2 hurricane. Early the following morning, Hilary weakened into a Category 1 hurricane, and weakened into a tropical storm on September 28.[67] Losing a lot of its convection on September 30, the National Hurricane Center noted that Hilary had weakened into a tropical depression. Several hours later, after sustaining no deep convection atop its centre, Hilary was declared a remnant low, located several hundred miles away from any landmasses. But over the next two days, Hilary's remnants continued to move northwestward, as a convectionless vortex. But late on October 2, the remnant low of Hurricane Hilary dissipated completely, to the far southwest of Southern California. [68]

The NHC noted the possibility of up to 10 in (250 mm) of rain in the high-terrain of Guerrero and Oaxaca. Tropical cyclone watches and warnings were also issued for portions of the coast. Large swells were also expected.[69] A red (emergency) alert was issued for parts of the coast. Officials urged residents to be prepared to evacuate.[70] The port of Acapulco was closed for small craft. A moderate to high alert of rain and wind was noted.[71]

The storm's outer bands produced heavy rainfall over Chipas and Tabasco, with accumulations in Tabasco reaching 8.58 in (218 mm) in 24 hours.[72] Several rivers across the region overflowed their banks and flooded nearby areas. In Villahermosa, heavy rain collapsed drains and many streets were flooded. In addition, cars were stranded in floodwaters. Across Colima, waves reached 9 to 15 ft (2.7 to 4.6 m).[73]

Hurricane Jova

Hurricane Jova
Current storm status
Category 1 hurricane (1-min mean)
Satellite image
Forecast map
As of:2 a.m. PDT (0900 UTC) October 12
Location:19.9°N 105.1°W ± 20 nm
About 80 mi (130 km) NW of Manzanillo, Mexico
About 50 mi (85 km) SE of Cabo Corrientes, Mexico
Sustained winds:75 knots (85 mph; 140 km/h) (1-min mean)
gusting to 90 knots (105 mph; 165 km/h)
Pressure:981 mbar (hPa; 28.97 inHg)
Movement:N at 8 kt (9 mph; 15 km/h)
See more detailed information.
Main article: Hurricane Jova (2011)

During the late hours of October 4, an area of showers and thunderstorms associated with a broad low pressure area developed several hundred miles to the south-southwest of Acapulco, Mexico. Moving slowly towards the west, the area of disturbed weather quickly organized. Late on October 5, the National Hurricane Center (NHC) noted that the area had a high chance of developing into a tropical cyclone over the next 48 hours. Just several hours later, the NHC began issuing advisories on Tropical Depression Ten-E, several hundred miles to the south of Manzanillo, Mexico. A more gradual type of development took place after then, and the depression was upgraded into Tropical Storm Jova on the afternoon of October 6. Taking advantage of the favorable environment Jova was embedded within, the storm became a hurricane on October 8, and by October 10, the storm was upgraded to a Category 3 hurricane on the Saffir-Simpson hurricane scale. However, shortly thereafter, the storm began an Eyewall replacement cycle and weakened to a lower-end Category 2 hurricane.


Current storm information

Template:HurricaneWarningsTable As of 2 a.m. PDT (0900 UTC) October 12, Hurricane Jova is located within 20 nautical miles of 19°54′N 105°06′W / 19.9°N 105.1°W / 19.9; -105.1 (Jova), about 80 mi (130 km) northwest of Manzanillo, Mexico and about 50 mi (85 km)southeast of Cabo Corrientes, Mexico. Maximum sustained winds are 75 knots (85 mph, 140 km/h), with stronger gusts. Minimum central pressure is 981 mbar (hPa; 28.97 InHg), and the system is moving north at 8 kt (9 mph, 15 km/h).

Hurricane force winds extend up to 15 miles (30 km) from the center of Jova, and tropical storm force winds up to 105 miles (30 km) from the center.

For latest official information see:

Hurricane Irwin

Tropical Storm Irwin
Current storm status
Tropical storm (1-min mean)
Satellite image
Forecast map
As of:2 a.m. PDT (0900 UTC) October 12
Location:15.2°N 112.3°W ± 25 nm
About 555 mi (895 km) SSW of S. tip of Baja California
About 590 mi (950 km) WSW of Manzanillo, Mexico
Sustained winds:35 knots (40 mph; 65 km/h) (1-min mean)
gusting to 45 knots (50 mph; 85 km/h)
Pressure:1004 mbar (hPa; 29.65 inHg)
Movement:ENE at 9 kt (10 mph; 17 km/h)
See more detailed information.

In early October, an area of showers and thunderstorms associated with a low pressure area developed several hundred miles to the south of Mexico. Moving towards the west and west-northwest, the low pressure quickly gained organization, and during the pre-dawn hours of October 6, the National Hurricane Center began issuing advisories on newly formed Tropical Depression Eleven-E. Later on October 6, Tropical Depression Eleven-E strengthened to Tropical Storm Irwin, and it became a hurricane the next day. The next day it weakened to a tropical storm. On October 11, Irwin weakened further into a tropical depression due to very strong wind shear, but later strengthened back to a tropical storm.

Current storm information

Template:HurricaneWarningsTable As of 2 a.m. PDT (0900 UTC) October 12, Tropical Storm Irwin is located within 25 nautical miles of 15°12′N 112°18′W / 15.2°N 112.3°W / 15.2; -112.3 (Irwin), about 555 mi (895 km) south-southwest of the southern tip of Baja California and about 590 mi (950 km) west-southwest of Manzanillo, Mexico. Maximum sustained winds are 35 knots (40 mph, 65 km/h), with stronger gusts. Minimum central pressure is 1004 mbar (hPa; 29.65 InHg), and the system is moving east-northeast at 9 kt (10 mph, 17 km/h). Tropical storm force winds extend outward up to 85 miles (140 km) from the center of Irwin.

For latest official information see:

Tropical Depression Twelve-E

Twelve-E
Current storm status
Tropical depression (1-min mean)
Forecast map
As of:2 a.m. PDT October 12 (0900 UTC October 12)
Location:14.7°N 93.6°W ± 20 nm
About 150 mi (240 km) SE of Salina Cruz, Mexico
Sustained winds:30 knots (35 mph; 55 km/h) (1-min mean)
gusting to 40 knots (45 mph; 75 km/h)
Pressure:1005 mbar (hPa; 29.68 inHg)
Movement:N at 4 kt (5 mph; 7 km/h)
See more detailed information.

On October 12 an area of low pressure just south of the Gulf of Tehuantepec became much better organized and was classified as Tropical Depression Twelve-E.

Current storm information

Template:HurricaneWarningsTable

As of 2 a.m. PDT (0900 UTC) October 12, Tropical Depression Twelve-E is located within 30 nautical miles of 14°42′N 93°36′W / 14.7°N 93.6°W / 14.7; -93.6 (Twelve-E), about 150 mi (240 km) southeast of Salina Cruz, Mexico. Maximum sustained winds are 30 knots (35 mph, 55 km/h), with stronger gusts. Minimum central pressure is 1005 mbar (hPa; 29.68 InHg), and the system is moving north at 4 kt (5 mph, 7 km/h).

For latest official information see:

Timeline of recent events

Main article: Timeline of the 2011 Pacific hurricane season
Hurricane Jova (2011)Hurricane Hilary (2011)Hurricane Dora (2011)Hurricane Beatriz (2011)Saffir-Simpson Hurricane Scale

October

October 6
  • 0300 UTC (8 p.m. PDT October 5) - Tropical Depression Ten-E forms about 625 miles (1005 km) south of Manzanillo, Mexico.
  • 0900 UTC (2 a.m. PDT) - Tropical Depression Eleven-E forms about 885 miles (1425 km) south-southwest of the southern tip of Baja California.
  • 1500 UTC (8 a.m. PDT) - Tropical Depression Eleven-E strengthens into Tropical Storm Irwin.
  • 2100 UTC (2 p.m. PDT) - Tropical Depression Ten-E strengthens into Tropical Storm Jova.
October 7
  • 0900 UTC (2 a.m. PDT) - Tropical Storm Irwin strengthens into a Category 1 hurricane.
October 8
  • 2100 UTC (2 p.m. PDT) - Tropical Storm Jova strengthens into a Category 1 hurricane.
  • 2100 UTC (2 p.m. PDT) - Hurricane Irwin weakens into a tropical storm.
October 10
  • 0300 UTC (8 p.m. PDT October 9) - Hurricane Jova strengthens into a Category 2 hurricane.
  • 0900 UTC (2 a.m. PDT) - Hurricane Jova strengthens into a Category 3 major hurricane.
October 11
  • 0300 UTC (8 p.m. PDT October 10) - Tropical Storm Irwin weakens into a tropical depression.
  • 1500 UTC (8 a.m. PDT) - Tropical Depression Irwin restrengthens into a tropical storm.
October 13
  • 0700 UTC (12 a.m. PDT) - Hurricane Jova makes landfall in Jalisco, Mexico.
  • 0900 UTC (02 a.m. PDT) - Tropical Depression Twelve-E forms just south of the Gulf of Tehuantepec.

Accumulated Cyclone Energy (ACE)

ACE (104kt²) (Source) — Storm:
1 31.3 Hilary 6 6.42 Irwin
2 14.7 Eugene 7 4.43 Greg
3 14.7 Dora 8 3.00 Beatriz
4 14.0 Jova 9 1.73
(1.23) 		Fernanda
5 12.2 Adrian 10 2.43 Calvin
Total: 105 (1.23)

The table on the right shows the ACE for each storm in the season. Broadly speaking, the ACE is a measure of the power of a 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 calculated for only full advisories on specifically tropical systems reaching or exceeding wind speeds of 34 knots (39 mph, 63 km/h), or tropical storm strength. Accordingly, tropical depressions are not included here. The ACE also does not include subtropical storms. Later the NHC reexamines the data, and produces a final report on each storm, which can lead to the ACE for a storm being revised either upward or downward. Until the final reports are issued, ACEs are, therefore, provisional.

The figures in parentheses are for storms in the Central Pacific basin west of 140°W; those not in parentheses are for the Eastern Pacific basin.

Storm names

The following names will be used for named storms that form in the North East Pacific in 2011. Retired names, if any, will be announced by the World Meteorological Organization in the spring of 2012. The names not retired from this list will be used again in the 2017 season. This is the same list used in the 2005 season.[74]

  • Irwin (active)
  • Jova (active)
  • Kenneth (unused)
  • Lidia (unused)
  • Max (unused)
  • Norma (unused)
  • Otis (unused)
  • Pilar (unused)
  • Ramon (unused)
  • Selma (unused)
  • Todd (unused)
  • Veronica (unused)
  • Wiley (unused)
  • Xina (unused)
  • York (unused)
  • Zelda (unused)

For the central Pacific Ocean, four consecutive lists are used, with the names used sequentially until exhausted, rather than until the end of the year, due to the low number of storms each year. The next four names are shown here:

  • Pewa (unused)
  • Unala (unused)
  • Wali (unused)
  • Ana (unused)

Season effects

This is a table of all of the storms in the 2011 Pacific hurricane season. It includes their durations, peak intensities, names, landfall(s), damages, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but are still storm-related. Damage and deaths include totals while the storm was extratropical or a wave or a low. All of the damage figures are in 2011 USD.

Saffir–Simpson scale
TD TS C1 C2 C3 C4 C5
2011 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 Ref(s)
Adrian June 7 – June 12 Category 4 hurricane 140 (220) 944 Western Mexico None 0
Beatriz June 19 – June 22 Category 1 hurricane 90 (150) 977 Southwestern Mexico, Western Mexico None 4
Calvin July 7 – July 10 Category 1 hurricane 80 (130) 984 None None 0
Dora July 18 – July 24 Category 4 hurricane 155 (250) 929 Southwestern Mexico, Western Mexico, Baja California Sur, Southwestern United States None 0
Eugene July 31 – August 6 Category 4 hurricane 140 (220) 942 None None 0
Fernanda August 15 – August 20 Tropical storm 65 (100) 994 None None 0
Greg August 16 – August 21 Category 1 hurricane 85 (140) 980 None None 0
Eight-E August 31 – September 1 Tropical depression 35 (55) 1002 Southwestern Mexico, Western Mexico (Michoacán) None 0
Hilary September 21 – September 30 Category 4 hurricane 145 (230) 940 Southwestern Mexico N/A 0
Jova October 5 – currently active Category 3 hurricane 125 (205) 955 Southwestern Mexico, Western Mexico N/A 0
Irwin October 5 – currently active Category 1 hurricane 90 (150) 977 None None 0
Twelve-E October 12 – currently active Tropical depression 35 (55) 1005 Southwestern Mexico None 0
Season aggregates
11 systems June 7 – Season in progress   155 (250) 929 0 4  

See also

References

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