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Cyclone Gita

Strong tropical cyclone which affected Tonga

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Throughout its path in the South Pacific, Cyclone Gita affected multiple island nations and territories. Tonga was the hardest-hit, with severe damage occurring on the islands of Tongatapu and ʻEua; two fatalities and forty-one injuries occurred in the kingdom. At least 171 homes were destroyed and more than 1,100 suffered damage. Violent winds destroyed homes and left the two islands largely without power. Torrential rains and damaging winds caused widespread disruptions in Samoa and American Samoa, prompting emergency declarations in both. Outlying islands in the Fijian Lau Islands were significantly affected, particularly Ono-i-Lau and Vatoa. Wallis and Futuna, Niue, and Vanuatu were also affected, but impacts in those areas were minor. Total damage from Gita is estimated to be in excess of US$252 million, primarily in American Samoa and Tonga.

Meteorological history

On 3 February, the Fiji Meteorological Service (FMS) started to monitor Tropical Disturbance 07F, which had developed within a trough of low pressure, about 435 km (270 mi) to the southeast of Honiara in the Solomon Islands. The system was poorly organized and was located along an upper-level ridge of high pressure, in an area of high vertical wind shear. Over the next couple of days, the system moved erratically near northern Vanuatu and remained poorly organized, with convection located to the south of the low-level circulation center. The system subsequently started to move south-eastwards, towards the Fijian Islands and a favorable environment for further development, on 5 February. The system subsequently passed near the island nation during 8 February, where it developed into a tropical depression and started to move north-eastwards towards the Samoan Islands. During 9 February, the United States Joint Typhoon Warning Center (JTWC) initiated advisories on the system and designated it as Tropical Cyclone 09P, after an ASCAT image showed that it had winds of 65–75 km/h (40–45 mph) in its northern semicircle. The FMS subsequently named the system Tropical Cyclone Gita early, after the United States National Weather Service Weather Forecast Office in Pago Pago requested that the system be named early for warning and humanitarian reasons.

After Gita was named, a prolonged period of rapid intensification ensued as it quickly intensified into a Category 1 tropical cyclone on the Australian tropical cyclone intensity scale, before it passed within 100 km (60 mi) of Samoa and American Samoa. After moving past the Samoan Islands, Gita turned southeast, then southwards, under the influence of a near-equatorial ridge to the northeast. On 10 February, Gita rapidly intensified to a category 3 severe tropical cyclone on the Australian scale while traversing anomalously warm sea surface temperatures of between 28–29 °C (82–84 °F). The system bypassed Niue to the east during this intensification phase. On 11 February, Gita continued to intensify into a category 4 severe tropical cyclone. At the same time, Gita turned westward under the influence of a subtropical ridge to the south. Around 12:00 UTC on 12 February, the cyclone passed near or over the Tongan islands of ʻEua and Tongatapu as a high-end Category 4 severe tropical cyclone. At this time, maximum 10-minute sustained winds were estimated at 195 km/h (121 mph) making Gita the strongest cyclone to strike the nation since reliable records began. The JTWC estimated the system to have reached its overall peak intensity at this time as a Category 4-equivalent on the Saffir-Simpson scale with 1-minute sustained winds of 230 km/h (140 mph).

At 18:00 UTC on 13 February, Gita reached its peak strength approximately 205 km (127 mi) south of Kandavu, Fiji, as a Category 5 severe tropical cyclone with ten-minute sustained winds of 205 km/h (127 mph), gusts to 285 km/h (177 mph), a minimum pressure of 927 mbar (hPa; 27.37 inHg).

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