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Cyclone Vaianu (2006)
Severe Tropical Cyclone Vaianu (RSMC Nadi designation: 12F, JTWC designation: 11P) was the fourth named tropical cyclone of the 2005–06 South Pacific cyclone season. The system formed on February 11, and moved generally towards the south throughout its life. Vaianu ultimately peaked with winds corresponding to Category 1 status on the Saffir-Simpson Hurricane Scale, and passed between Fiji and Tonga. Moving into cooler waters, the storm dissipated on February 16. Although the cyclone avoided land for the most part, it caused heavy rainfall and gusty winds in portions of Tonga. Flooding hit the capital city of Nuku'alofa, and on some islands, the storm destroyed crops.
==Meteorological history==
Late on February 9, the Regional Specialized Meteorological Centre (RSMC) in Nadi, Fiji reported that Tropical Depression 12F had developed within a convergence zone which was located about to the northeast of Vanua Levu.〔 The depression tracked southeastward, although further development was initially inhibited by wind shear. During the next day, the depression turned towards the southeast and moved into a more favorable environment for intensification.〔 It was then designated as Tropical Depression 11P at 1800 UTC by the Joint Typhoon Warning Center (JTWC).〔(【引用サイトリンク】accessdate=January 27, 2010 )〕 On February 11, the system significantly organized, and at 1200 UTC that day, RSMC Nadi reported that the depression had intensified into a Category 1 tropical cyclone on the Australian tropical cyclone intensity scale; it was assigned the name Vaianu.
At the time of being upgraded to a cyclone, Vaianu was situated about to the northwest of Vavaʻu, a Tonga island chain.〔 The storm turned southwestward under the steering currents of a ridge to the southeast.〔 The JTWC recognized the system as a tropical storm on February 12, and upgraded it into a tropical cyclone shortly thereafter.〔 Vaianu continued to strengthen, and passed west of Tonga.〔 The JTWC reported that the cyclone peaked in intensity at 1200 UTC on February 13, with maximum sustained 1-minute winds of 140 km/h (85 mph).〔 RSMC Nadi assessed the storm as having peaked slightly later, with 10-minute winds of 130 km/h (80 mph), which made it a Category 3 severe tropical cyclone.〔
The storm held its strength for some time as it moved southward between Ono-i-Lau and Tongatapu. Beginning to accelerate, Vaianu entered the area of responsibility of the Tropical Cyclone Warning Centre in Wellington, New Zealand.〔 It curved southeastward and slowly deteriorated due to increasing wind shear and colder sea surface temperatures.〔 The JTWC downgraded it to a tropical storm on February 15,〔 and by the next day it was undergoing an extratropical transition.〔 At 0600 UTC, the JTWC classified it as extratropical,〔 but it remained a powerful storm system for several days as it tracked over the open ocean.〔
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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