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Severe Tropical Cyclone Yasi was a very powerful and destructive tropical cyclone that made landfall in northern Queensland, Australia on 3 February 2011, causing severe damage to affected areas. Yasi originated from a tropical low near Fiji. The system intensified to a Category 3 cyclone at about 5 p.m. AEST (07:00 UTC) on 31 January 2011. Late on 1 February the cyclone strengthened to a Category 4 system, then early on 2 February, the cyclone intensified to a Category 5 system. According to Tropical Cyclone Advice Number 21, at 9pm AEST (11:00 UTC) the system was centred near , "110 kilometres east of Innisfail and moving west southwest at 25 kilometres per hour," with a central pressure of . The system had a well-defined eye and a dvorak intensity of T6.5. According to Tropical Cyclone Advice Number 24 at 11:54pm AEST (13:54 UTC), the large destructive core had commenced to cross the coast between Innisfail and Cardwell with a central pressure of 930 hectopascals and maximum 10-minute sustained winds of 215 km/h. Maximum 3-second gusts are estimated at 285 km/h, with these likely to affect an area spanning from Ingham to Cairns according to the Threat Map for a period of 3–4 hours. The eye crossed the coastline at Mission Beach just before 12:00am AEST (14:00 UTC) and passed over Tully soon after. The commentary on this data indicates that "models are quite consistent with the forecast motion" and adds "with the expectation of being a large and intense system, cyclone intensity may be maintained further inland than normal." The cyclone was expected to be a Category 3 system near Georgetown, 450 km inland as well as affecting the Mining town of Mount Isa. The storm caused an estimated US$3.6 billion in damage, making it the costliest tropical cyclone to hit Australia on record (not accounting for inflation). Yasi was also indirectly responsible for the death of a 23-year-old man who died of suffocation by generator exhaust fumes. ==Meteorological history== Severe Tropical Cyclone Yasi was first identified on 26 January 2011 as a tropical disturbance, given the identifier "09F" by the Regional Specialized Meteorological Center in Nadi, Fiji (Fiji Meteorological Service; FMS), located about 330 km (205 mi) south-southwest of Tuvalu. Situated over a region of high sea surface temperatures and low to moderate wind shear, gradual intensification was expected as the system moved southwestwards. Little development took place over the following two days, though the disturbance was classified as a tropical depression on 27 January. By 28 January, the depression was characterised as a poorly developed low with a broad area of rotating, flaring convection. Considerable development took place the following day, prompting the Joint Typhoon Warning Center (JTWC) to issue a Tropical Cyclone Formation Alert. The storm's low-level circulation centre became increasingly defined and convective banding features were apparent along the northern periphery of the depression. Rapid development took place throughout 30 January, resulting in the JTWC upgrading the system to a tropical storm after data from an ASCAT image depicted winds near gale-force around the storm's centre. Shortly thereafter, the FMS also upgraded the storm, classifying it as Tropical Cyclone Yasi. Upon being classified a tropical cyclone, Yasi was located about 370 km (230 mi) northeast of Vanuatu.〔 Situated along the northern edge of a strong subtropical ridge, the storm tracked in a general westward direction, taking it through the northern islands of the country. Continuing to rapidly intensify, Yasi attained severe tropical cyclone intensity with ten-minute sustained winds of at least 120 km/h (75 mph) on 31 January as the primary convective band wrapped around the storm's centre. Later that day, the storm crossed 160°E, prompting the final advisory from the FMS and the first advisory from the Australian Bureau of Meteorology as it crossed into the Australian cyclone basin. Tropical Cyclone Yasi moved across Vanuatu's northern Torba Province, with winds reaching up to 95 km/h (60 mph). Vanuatuan officials reported difficulties making contact with the Torba Province, but it was believed that the northern area escaped major damage. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cyclone Yasi」の詳細全文を読む スポンサード リンク
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