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2012 Pacific hurricane season

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2012 Pacific hurricane season
Season summary map
Seasonal boundaries
First system formedMay 14, 2012
Last system dissipatedSeason still active
Strongest storm
NameBud
 • Maximum winds115 mph (185 km/h)
 • Lowest pressure960 mbar (hPa; 28.35 inHg)
Seasonal statistics
Total depressions2
Total storms2
Hurricanes1
Major hurricanes
(Cat. 3+)		1
Total fatalitiesUnknown
Total damageUnknown
Related article
Pacific hurricane seasons
2010, 2011, 2012, Post-2012

The 2012 Pacific hurricane season is an event in the annual cycle of tropical cyclone formation. The season was scheduled to officially start on May 15, 2012 in the Eastern Pacific, although Tropical Storm Aletta developed a day prior. The season is scheduled to begin on June 1, 2012 in the Central Pacific, and the entire season will end on November 30, 2012. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin.

Seasonal forecasts

Predictions of tropical activity in the 2012 season
Source Date Named
storms 		Hurricanes Major
hurricanes
Average (1971–2006) 15.3 8.8 4.2
Record high activity 28 16 (tie) 10
Record low activity 8 (tie) 3 0† (tie)
–––––––––––––––––––––––––––––––––––––––––––––––––––––––
NOAA May 24, 2012 12-18 5-9 2-5
–––––––––––––––––––––––––––––––––––––––––––––––––––––––
2 1 1
*† Most recent of several such occurrences. (See all)

Storms

Tropical Storm Aletta

Tropical storm (SSHWS)
 
DurationMay 14 – May 19
Peak intensity50 mph (85 km/h) (1-min);
1000 mbar (hPa)

On May 12, the NHC started to monitor a tropical disturbance that had developed about 550 miles (890 km) to the south-southwest of Acapulco, Mexico.[1] During that day the disturbance moved quickly towards the northwest before early on May 14, the disturbance was deemed to have organised enough to be declared Tropical Depression One-E.[2] During that day the depression intensified further before it was declared a tropical storm and named Aletta.[3] On May 16, Tropical Storm Aletta reached its peak intensity of 50 mph (85 km/h), with a minimum low pressure of 1000 hPa. Later on May 16, Tropical Storm Aletta began to enter unfavorable environmental conditions, with increasing wind shear and dry air, which weakened the storm to a 40 mph (65 km/h) tropical storm. Very late on May 16, the National Hurricane Center downgraded Aletta to a tropical depression, as the system began losing its convection after turning to the west-northwest.[4] On May 17, Tropical Depression Aletta lost most of its convection, as it turned to the northwest.[5] Late on May 17, Aletta regained much of its convection, as it turned northward.[6] On May 18, Aletta lost all of its western and southern convection, due to winds shear as the storm turned northeastward, and continued to weaken. Aletta became post-tropical the next day, as it turned to the east.[7]

Hurricane Bud

Hurricane Bud
Current storm status
Category 1 hurricane (1-min mean)
Satellite image
Forecast map
As of:2 p.m. PDT (2100 UTC) May 25
Location:19.2°N 105.5°W ± 10 nm
About 80 mi (130 km) W of Manzanillo, Mexico
About 85 mi (135 km) S of Cabo Corrientes, Mexico
Sustained winds:65 knots (75 mph; 120 km/h) (1-min mean)
gusting to 80 knots (90 mph; 150 km/h)
Pressure:995 mbar (hPa; 29.38 inHg)
Movement:N at 6 kt (7 mph; 11 km/h)
See more detailed information.
Main article: Hurricane Bud (2012)

On May 12, a low pressure system formed just south of eastern Panama. The storm slowly organized as it moved westwards. On May 15, the storm acquired a burst of convection, and the NHC began to monitor the system.[8] As the storm turned west-northwestwards, it organized significantly. On May 17, wind shear began to erode the storm's convection, weakening the system and causing it to stall, although the system continued to persist. On May 20, the storm strengthened rapidly, as it began moving again, and on May 21, the NHC reported that the storm had strengthened into Tropical Depression Two-E.[9] Then, as it slightly accelerated to the west, the storm continued to organize, eventually intensifying into Tropical Storm Bud on May 22, with 40 mph sustained winds. Bud remained at this intensity for one day before strengthening, starting early on May 23, and reached winds of 65 mph (100 km/h) during the afternoon. By the next morning (May 24), Bud continued its rapid intensification, reaching sustained winds of 85 mph, and then 110 mph by the afternoon, as the system turned northward. Later on the same day, Bud turned to the northeast, and began to approach the coast of Western Mexico. Late on May 24, Bud intensified further into a Category 3 Major Hurricane, and obtained a peak intensity of 115 mph winds, with a minimum central low pressure of 960 mbars.[10] Hurricane Bud was able to maintain Category 3 intensity for the next several hours, even its outer rainbands began moving onshore in Western Mexico. Very early on May 25, Hurricane Bud weakened down to a strong Category 2 hurricane.[11] Hurricane Bud rapidly began to weaken, as it slowly moved onshore. Bud quickly lost most of its convection, which was sheared mainly to the north. During the mid-afternoon of May 25, Bud weakened down to a strong tropical storm, as it began making landfall on Western Mexico.

Current storm information

As of 2 p.m. PDT (2100 UTC) May 25, Hurricane Bud is located within 10 nautical miles of 19°12′N 105°30′W / 19.2°N 105.5°W / 19.2; -105.5 (Bud), about 80 mi (130 km) west of Manzanillo, Mexico and about 85 mi (135 km) south of Cabo Corrientes, Mexico. Maximum sustained winds are 65 knots (75 mph, 120 km/h), with stronger gusts. Minimum central pressure is 995 mbar (hPa; 29.38 InHg), and the system is moving north at 6 kt (7 mph, 11 km/h).

Hurricane force winds extend up to 12 miles (19 km) from the center of Bud, and tropical storm force winds up to 105 miles (19 km) from the center.

Watches and warnings

See also: Tropical cyclone warnings and watches

Template:HurricaneWarningsTable

For latest official information see:

Timeline of recent events

Main article: Timeline of the 2012 Pacific hurricane season
Saffir-Simpson Hurricane Scale


May

May 14
  • 1500 UTC (8 a.m. PDT) - Tropical Depression One-E forms about 645 miles south of Manzanillo, Mexico.
May 15
  • 0000 UTC (8 p.m. PDT May 14) - Tropical Depression One strengthens into Tropical Storm Aletta about 650 miles south-southwest of Manzanillo, Mexico.
May 17
  • 0900 UTC (2 a.m. PDT) - Tropical Storm Aletta weakens into a tropical depression about 835 miles south-southwest of the southern tip of Baja California.
May 19
  • 1500 UTC (8 a.m. PDT) - Tropical Depression Aletta transitions into a post-tropical cyclone about 585 miles south-southwest of the southern tip of Baja California.
May 21
  • 0300 UTC (8 p.m. PDT) - Tropical Depression Two-E forms about 525 miles south of Acapulco, Mexico.
May 22
  • 0900 UTC (2 a.m. PDT) - Tropical Depression Two-E strengthens into Tropical Storm Bud about 515 miles south of Zihuatanejo, Mexico.
May 24
  • 0600 UTC (11 p.m. PDT) - Tropical Storm Bud strengthens into a Category 1 hurricane.
  • 1400 UTC (7 a.m. PDT) - Hurricane Bud strengthens into a Category 2 hurricane.
  • 1900 UTC (8.p.m. PDT) - Hurricane Bud strengthens into a Category 3 major hurricane.

Storm names

The following names will be used for named storms that form in the Eastern Pacific in 2012. Retired names, if any, will be announced by the World Meteorological Organization in the spring of 2013. The names not retired from this list will be used again in the 2018 season. This is the same list used in the 2006 season.

  • Aletta
  • Bud (active)
  • Carlotta (unused)
  • Daniel (unused)
  • Emilia (unused)
  • Fabio (unused)
  • Gilma (unused)
  • Hector (unused)
  • Ileana (unused)
  • John (unused)
  • Kristy (unused)
  • Lane (unused)
  • Miriam (unused)
  • Norman (unused)
  • Olivia (unused)
  • Paul (unused)
  • Rosa (unused)
  • Sergio (unused)
  • Tara (unused)
  • Vicente (unused)
  • Willa (unused)
  • Xavier (unused)
  • Yolanda (unused)
  • Zeke (unused)

The Central Pacific season originates around the islands of Hawaii. There are several names that are in four lists; the next four names to be used are shown below.

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

Season effects

This is a table of all of the storms in the 2012 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, a wave, or a low. All of the damage figures are in 2012 USD.

Saffir–Simpson scale
TD TS C1 C2 C3 C4 C5
2012 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)
Aletta May 14 – May 19 Tropical storm 50 (85) 1000 None None None
Bud May 21 – Currently active  Category 3 hurricane 115 (180) 960 Western Mexico None None
Season aggregates
2 systems May 14 – Currently active    115 mph (180 km/h) 960 0 0  

Accumulated Cyclone Energy (ACE)

ACE (104kt²) (Source) — Storm:
1 6.48 Bud 2 1.18 Aletta
Total: 7.66

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.

See also

References

  1. ^ Jack Beven; National Hurricane Center (May 12, 2012). "Special Tropical Weather Outlook". National Oceanic and Atmospheric Administration's National Weather Service. Retrieved May 15, 2012.
  2. ^ Todd Kimberlain; National Hurricane Center (May 14, 2012). "Tropical Depression One-E Discussion Number One". National Oceanic and Atmospheric Administration's National Weather Service. Retrieved May 15, 2012.
  3. ^ Richard Pasch; National Hurricane Center (May 15, 2012). "Tropical Storm Aletta Discussion Number One". National Oceanic and Atmospheric Administration's National Weather Service. Retrieved May 15, 2012.
  4. ^ http://www.nhc.noaa.gov/archive/gtwo/epac/201205170831/index.php?basin=epac&current_issuance=201205170831
  5. ^ http://www.nhc.noaa.gov/archive/gtwo/epac/201205171434/index.php?basin=epac&current_issuance=201205171434
  6. ^ http://www.nhc.noaa.gov/archive/gtwo/epac/201205172335/index.php?basin=epac&current_issuance=201205172335
  7. ^ Cangialosi, John. "Aletta Final Advisory". National Hurricane Center. Retrieved 22 May 2012.
  8. ^ http://www.nhc.noaa.gov/archive/gtwo/epac/201205151740/index.php?basin=epac&current_issuance=201205151740
  9. ^ http://www.nhc.noaa.gov/archive/gtwo/epac/201205210237/index.php?basin=epac&current_issuance=201205210237
  10. ^ http://www.nhc.noaa.gov/archive/gtwo/epac/201205250534/index.php?basin=epac&current_issuance=201205250534
  11. ^ http://www.nhc.noaa.gov/archive/gtwo/epac/201205250836/index.php?basin=epac&current_issuance=201205250836

Template:2010-2019 Pacific hurricane seasons

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