Timeline of the 2011 Pacific hurricane season

Timeline of the
2011 Pacific hurricane season
Season summary map
Season boundaries
First system formedJune 7, 2011
Last system dissipatedNovember 25, 2011
Strongest system
NameDora
Maximum winds155 mph (250 km/h)
(1-minute sustained)
Lowest pressure929 mbar (hPa; 27.43 inHg)
Longest lasting system
NameIrwin
Duration10.75 days
Storm articles
Other years
2009, 2010, 2011, 2012, 2013

The 2011 Pacific hurricane season consisted of the events that occurred in the annual cycle of tropical cyclone formation over the Pacific Ocean north of the Equator and east of the International Date Line. The official bounds of each Pacific hurricane season are dates that conventionally delineate the period each year during which tropical cyclones tend to form in the basin according to the National Hurricane Center (NHC), beginning on May 15 in the Eastern Pacific proper (east of 140°W) and June 1 in the Central Pacific (140°W to the International Date Line), and ending on November 30 in both areas. However, tropical cyclogenesis is possible at any time of year.[1] 11 tropical storms developed during the season, which is below the 1991–2020 average of 15 tropical storms.[1] However, all but one became hurricanes and six further strengthened into major hurricanes,[nb 1] eclipsing the 1991–2020 averages of eight hurricanes and four major hurricanes.[1] There were also two tropical depressions that remained below tropical storm status. The first system, Hurricane Adrian, formed on June 7; the final, Hurricane Kenneth, was the latest in a calendar year to exist east of 140°W since 1983, dissipating on November 25.[2]

Several tropical cyclones impacted land during the 2011 season. The deadliest was Tropical Depression Twelve-E, which was part of a large area of torrential rains over Central America in mid-October. Widespread and destructive flooding and mudslides occurred in southeastern Mexico and Guatemala; at least 36 fatalities were directly attributed to the tropical depression itself, with many more in Central America being blamed on the overall weather system.[nb 2] On the same day that Twelve-E made landfall, Hurricane Jova came ashore further to the west, in the Mexican state of Jalisco, at Category 2 strength; high winds and heavy rains killed nine people and caused considerable damage.[7]

Prior to 2015, two time zones were utilized in the Eastern Pacific basin: Pacific east of 140°W, and Hawaii−Aleutian from 140°W to the International Date Line.[8][9] For convenience, each event is listed in Coordinated Universal Time (UTC) first, using the 24-hour clock (where 00:00 = midnight UTC),[10] with the respective local time included in parentheses. Figures for maximum sustained winds and position estimates are rounded to the nearest five units (knots, miles, or kilometers) and averaged over one minute, following National Hurricane Center practice. Direct wind observations are rounded to the nearest whole number. Atmospheric pressures are listed to the nearest millibar and nearest hundredth of an inch of mercury. This timeline documents the formation of tropical cyclones as well as the strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. It also includes information that was not released while the storm was active, meaning that data from post-storm reviews by the National Hurricane Center and the Central Pacific Hurricane Center is included.

  1. ^ a b c d "Tropical Cyclone Climatology". Miami, Florida: National Hurricane Center. Archived from the original on April 1, 2024. Retrieved July 16, 2024.
  2. ^ Blake, Eric S.; Kimberlain, Todd B. (May 1, 2013). "Eastern North Pacific Hurricane Season of 2011". Monthly Weather Review. 141 (5). American Meteorological Society: 1397–1412. Bibcode:2013MWRv..141.1397B. doi:10.1175/MWR-D-12-00192.1.
  3. ^ Kimberlain, Todd B. (January 12, 2012). Tropical Cyclone Report: Tropical Depression Twelve-E (PDF) (Report). Miami, Florida: National Hurricane Center. Archived (PDF) from the original on December 5, 2023. Retrieved July 19, 2024.
  4. ^ "Central America Death Toll at 45 from Heavy Rains". Reuters. Tegucigalpa, Honduras. October 15, 2011. Archived from the original on October 19, 2011. Retrieved July 21, 2024.
  5. ^ "Suben a 34 los Fallecidos por Lluvias en Centroamérica". El Nacional (in Spanish). Reuters. October 14, 2011. Archived from the original on 2011-10-15. Retrieved July 21, 2024.
  6. ^ EFE (October 13, 2011). "Cerca de 30 Muertos por Lluvias Que Comienzan a Amainar en Centroamérica" (in Spanish). Univision. Archived from the original on October 26, 2014. Retrieved July 21, 2024.
  7. ^ Brennan, Michael J. (May 18, 2012). Tropical Cyclone Report: Hurricane Jova (PDF) (Report). Miami, Florida: National Hurricane Center. Archived (PDF) from the original on September 30, 2023. Retrieved July 19, 2024.
  8. ^ "NHC Tropical Cyclone Text Product Descriptions". Miami, Florida: National Hurricane Center. Archived from the original on July 10, 2024. Retrieved July 13, 2024.
  9. ^ "Update on NHC Products and Services for 2015" (PDF). Miami, Florida: National Hurricane Center. March 26, 2015. Archived (PDF) from the original on November 28, 2023. Retrieved July 13, 2024.
  10. ^ "Understanding the Date/Time Stamps". Silver Spring, Maryland: National Weather Service. Archived from the original on February 26, 2023. Retrieved March 21, 2024.


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