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Tropical Depression 04F (2009)
Tropical Depression 04F was the first tropical depression to affect Fiji since Cyclone Gene made landfall on the country during January 2008. The depression formed late on January 4, 2009 as a weak tropical disturbance near the eastern edge of the Regional Specialized Meteorological Center (RSMC) in Nadi responsibility. The disturbance then rapidly organised itself sufficiently to be classified as Tropical Depression 04F early the next morning. Over the next couple of days the depression moved towards the southeast, before on January 8 it started to bring heavy rainfall to Fiji. RSMC Nadi then issued their final advisory on it later that day, as it was then an extratropical depression. However, late the next day RSMC Nadi started to reissue advisories on the depression and immediately passed primary warning responsibility for it to the Tropical Cyclone Warning Center in Wellington, who issued warnings on the depression until early on January 12 when they issued their last advisory.
==Meteorological history==
On January 4, 2009, the Regional Specialized Meteorological Centre in Nadi, Fiji, reported that a weak tropical disturbance had formed within the Coral Sea, to the east of Vanuatu.〔 At this time the disturbance had a circulation that was located within an environment which had low levels of vertical wind shear.〔 Convection had been present within the circulation for at least 12 hours, however it was poorly organised at this time. Early on January 5, RSMC Nadi reported that the disturbance had organised itself sufficiently to be classified as a tropical depression, and assigned the designation of 04F. At this time convection was displaced to the north of the low level circulation center.〔 The next morning RSMC Nadi reported that the depression's low level circulation center was exposed with deep convection being disorganised.
Early on January 7, the Joint Typhoon Warning Center (JTWC) reported that the depression had a broad low level circulation center which had disorgainised deep convection.〔 They also reported that the depression lay in an area of moderate to strong vertical wind shear and thus was not expected to develop. Early the next day the JTWC declared that the depression had dissipated. Later that day RSMC Nadi reported that the tropical depression lay in an area of moderately sheared environment with deep convection being to the east of the low level Circulation Center. They also downgraded it to a depression at this time which meant that the depression had some extra-tropical characteristics.〔 At this time as the depression was starting to brush by Fiji, RSMC Nadi released their final advisory on Tropical Depression 04F.〔 The next day RSMC Nadi started to reissue advisories on Depression 04F, as the depression had reorganised itself, and had reached its peak winds of 75 km/h (45 mph), with a peak pressure of 994 hPa. They then transferred primary warning responsibility of 04F to the Tropical Cyclone Warning Center (TCWC) in Wellington, New Zealand.〔 Over the next couple of days the depression moved towards the southwest, before TCWC Wellington issued their final advisory on the depression on January 12.
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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