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2015 Pacific hurricane season
The 2015 Pacific hurricane season was recognized as the second most active season, with a total of 26 named storms, of which a record-tying 16 became hurricanes and a record 11 became major hurricanes. The year featured record-high activity in the Central Pacific—the portion of the Eastern Pacific defined between the International Dateline and 140°W—with fifteen tropical cyclones forming in or entering the basin.〔()〕 Moreover, the season is now currently the second most active season in terms of Accumulated Cyclone Energy, beating the 1990 season with a total of 281 ACE units. The season officially started on May 15 in the East Pacific Ocean 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 Pacific basin. However, the formation of tropical cyclones is possible at any time of the year. The above-average activity during the season was attributed in part to a strong El Niño event.
Patricia became the strongest hurricane ever recorded in the Western Hemisphere on October 23, with a central pressure of 879 mbar and 1-minute sustained winds of 200 mph. It also became only the second Pacific hurricane to make landfall at Category 5 intensity.
==Seasonal forecasts==
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.〔 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.〔〔 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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