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Cyclone Xavier
Severe Tropical Cyclone Xavier (RSMC Nadi Designation: ''01F'', JTWC Designation: ''01P'') was a strong pre-season cyclone that formed on October 20, 2006 to the north of the Santa Cruz Islands. During the next day it rapidly developed and was designated as Tropical Depression 01F later that day, before being designated as Tropical Cyclone Xavier while over Santa Cruz early on October 22. Later on October 22, Xavier intensified into a category 3 severe tropical cyclone on the Australian Tropical Cyclone Intensity Scale, before passing over Tikopia early the next day. Xavier then reached its peak wind speeds of 175 km/h (110 mph 10-min), which made it a Category 4 cyclone early on October 24. Xavier stayed at its peak wind speeds until early the next day when it started to rapidly weaken, becoming a depression early on October 26. The remnants of Xavier persisted until October 28 before dissipating. There were no casualties reported as a result of the storm and little impact reported in the Solomon Islands and Vanuatu.
==Meteorological history==
During October 20, 2006 the Fiji Meteorological Service and the United States Joint Typhoon Warning Center started to monitor a tropical depression, that had developed within the South Pacific Convergence Zone to the north of Temotu Province in the Solomon Islands.〔http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/2007/2007s-bsh/bsh012007.txt〕 The system was located within an area of low to moderate vertical wind shear and had a good outflow in its northern and eastern quadrants. Over the next day conditions surrounding the system rapidly became favourable for further development, with convection starting to wrap into a well defined low level circulation centre.〔 As a result the depression rapidly developed further and was named Xavier by the FMS during October 22, after it had become a category 1 tropical cyclone on the Australian tropical cyclone intensity scale.〔〔 After the system was named the JTWC initiated advisories on the system and designated it as Tropical Cyclone 01P, while it was located over the Santa Cruz Islands.〔 Throughout October 22, Xavier's rapid intensification continued with it developing an eye feature and becoming a category 3 severe tropical cyclone.〔〔 During that day the system performed a small cyclonic loop over Temotu Province and passed near or over the Santa Cruz Island of Tikopia.〔
The systems rapid intensification subsequently slowed down during October 23, as an upper-level anticyclone located to the northwest of the system impeded the systems outflow. The system also started to move south-eastwards during that day, as a trough of low pressure created a break in the ridge of high pressure that was steering Xavier. The FMS subsequently estimated during October 24, that the system had peaked as a Category 4 Severe Tropical Cyclone with 10-minute sustained wind speeds of , while it was located about to the east of Vanua Lava in northern Vanuatu.〔〔 The JTWC also estimated during October 24, that the system had peaked with 1-minute sustained wind speeds of , which made it equivalent to a category 4 hurricane on the Saffir-Simpson hurricane wind scale.〔 Over the next day the system maintained its peak intensity as it moved south-eastwards, before it turned westwards during the next day towards Vanuatu and rapidly weakened after it moved into an area of cooler sea-surface temperatures and strong vertical wind-shear.〔〔〔 As a result during October 26, The FMS and JTWC both reported that the system had weakened into a tropical depression, with the JTWC issuing their final advisory on the system as they expected it to dissipate within 12 hours.〔 Xavier's remnants were last noted by the FMS during October 28, after the systems low level circulation centre was not able to be distinguished.〔
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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