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2009–10 South Pacific cyclone season
The 2009–10 South Pacific cyclone season began on December 3, 2009 with the formation of Tropical Disturbance 01F, 32 days after the cyclone season had officially begun on November 1, 2009. The season ended on April 30, 2010. These dates conventionally delimit the period of each year when most tropical cyclones form in the southern Pacific Ocean east of 160°E. Additionally, the regional tropical cyclone operational plan defines a ''tropical cyclone year'' separately from a ''tropical cyclone season''; the "tropical cyclone year" began on July 1, 2009 and ended on June 30, 2010. Tropical cyclones between 160°E and 120°W and north of 25°S are monitored by the Fiji Meteorological Service. Those that move south of 25°S are monitored by the Tropical Cyclone Warning Centre in Wellington, New Zealand.〔 The first tropical disturbance of the season formed on December 3, about 1015 km (700 mi) to the north of Suva, Fiji and later intensified into Tropical Cyclone Mick. The last system, 15F, dissipated on April 5 of the following year.
==Seasonal outlooks==
Ahead of the cyclone season, RSMC Nadi, TCWC Wellington, the Australian Bureau of Meteorology (BoM), the New Zealand National Institute of Water and Atmospheric Research (NIWA) and various other Pacific Meteorological services, all contributed towards the Island Climate Update tropical cyclone outlook that was released during October 2009.〔 The outlook took into account the El Nino conditions and normal developments during a near-normal season.〔 The outlook called for a near average number of tropical cyclones for the 2009–10 season, with eight to eleven tropical cyclones, to occur between 135°E and 120°W compared to an average of about nine.〔 At least two of the tropical cyclones were expected to become category 3 severe tropical cyclones, while one was likely to become a category 4 severe tropical cyclone.〔 The outlook also noted that it was likely that the first storm would develop prior to the end of December.〔 During February 2010, a seasonal forecast update was issued which maintained the original forecast of eight to eleven named tropical cyclones. In addition to contributing towards the Island Climate Update outlooks, RSMC Nadi issued their own seasonal forecast for their area of responsibility.〔 Within their outlook RSMC Nadi predicted that between eight and eleven tropical cyclones, would occur within the basin compared to an average of around 9.〔 At least two of the tropical cyclones were expected to become category 3 severe tropical cyclones, while one was likely to become a category 4 severe tropical cyclone.〔
Both the Island Climate Update and RSMC Nadi's tropical cyclone outlooks assessed the risk of a tropical cyclone affecting a certain island or territory.〔〔〔 Regional sea surface temperatures indicated that the Coral Sea was warmer than normal, but this was not expected to increase the risk of tropical cyclones in the western South Pacific.〔 As a result, it was predicted that the island nations located to the west of the International Dateline, would face a near average risk of being affected by a tropical cyclone.〔 However island nations to the east of the dateline such as Niue and Tonga, faced an increased risk of being affected by a tropical cyclone.〔 It was also noted that cyclones could affect parts of southwest French Polynesia and the southern Cook Islands during an El Niño, while the number of ex tropical cyclones coming to within of New Zealand was expected to remain about normal.〔 Within the Island Climate Update forecast update it was reported that the Solomon Islands faced an increased risk of tropical cyclones affecting them.〔
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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