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Cyclone Cliff
Tropical Cyclone Cliff was first noted as a weak tropical disturbance on April 1, 2007, within a trough of low pressure about to the southwest of Rotuma. Over the next couple of days the system drifted towards the southeast and Fiji, in an area of strong wind shear. During April 3, the system slightly accelerated, as it moved towards the south-southeast before the westerly wind shear around the system relaxed sufficiently to allow the depression to consolidate while it was located near Vanua Levu.
==Meteorological history==
On April 1, 2007, the Fiji Meteorological Service's Regional Specialized Meteorological Center in Nadi, Fiji (RSMC Nadi) reported that a weak tropical disturbance had developed, along a slow moving trough of low pressure about to the southwest of Rotuma. Over the next couple of days the system drifted towards the southeast and Fiji, in an area of strong westerly wind shear to the south of a ridge axis.〔 Early on April 3, RSMC Nadi initiated advisories on the system and designated it as Tropical Depression 14F, while it was located about to the north of Labasa, on Vanua Levu.〔 During that day the system slightly accelerated, as it moved towards the south-southeast.〔 Later that day RSMC Nadi reported that the systems low level circulation, was exposed to the northwest of the deep convection which was moving over northeastern Vanua Levu, Cikobia and other smaller islands.〔 The westerly wind shear around the system subsequently relaxed sufficiently, which allowed the depression to consolidate and the low level circulation center to move closer to the area of deep convection.〔
Early on April 4, the depression moved around the northeastern tip of Vanua Levu as bands of atmospheric convection rapidly developed and wrapped into the low level circulation center.〔 At 0300 UTC while the system was located about to the south-southeast of Labasa, RSMC Nadi named the depression, Cliff after the system had developed into a category 1 tropical cyclone on the Australian tropical cyclone intensity scale.〔 This was despite gale force winds not being present near the systems center, as required by the tropical cyclone operational plan for the region.〔 After Cliff had been named gale-force winds rapidly developed near the center, as it continued to intensify and accelerate towards the south-southeast through the Lau group of islands.〔 At around 0900 UTC on April 4, the United States Joint Typhoon Warning Center (JTWC) initiated advisories on the system and designated it as Tropical Cyclone 23P as it became a tropical storm. Over the next 24 hours Cliff continued to intensify, before the JTWC and RSMC Nadi reported during the next day, that Cliff had reached its peak intensity with sustained wind-speeds of 100 km/h (65 mph).〔 After peaking in intensity, the system subsequently accelerated further towards the southeast and into an area of cooler seas and higher wind shear.〔〔 This subsequently caused Cliff to become an extra tropical cyclone during February 6, before the system was last noted later that day as it merged with a mid-latitude frontal boundary.〔〔
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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