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Cyclone Tomas

Category 4 South Pacific cyclone in 2010

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Through State of emergency

Cyclone Tomas proved to be very destructive throughout Fiji, leaving many homeless and entire villages under water. At least one person was confirmed to have been killed by the storm after being swept out to sea while rescuing family members. Reports from outlying islands stated that entire homes had been flattened by wind gusts up to 280 km/h (170 mph).

Meteorological history

On March 9, the Fiji Meteorological Service (FMS) reported that Tropical Disturbance 14F had developed about 95 km (60 mi) to the northwest of Pago Pago in American Samoa. Over the next day, the system moved north-westwards in a marginal environment for further development with weak vertical windshear, while atmospheric convection consolidated around a developing low-level circulation center. As a result, the FMS classified the system as a tropical depression before the United States Joint Typhoon Warning Center issued a tropical cyclone formation alert on the system.

Located within an environment characterized by low wind shear, further intensification was anticipated as convection continued to develop over the expanding system. Around 1500 UTC on March 11, the JTWC issued their first advisory on the cyclone, classifying it as Tropical Storm 19P. Several hours later, the FMS upgraded the system to a Category 1 cyclone and gave it the name Tomas. Rapid intensification was expected to take place over the following 48 hours as sea surface temperatures ahead of the storm averaged 30 °C (86 °F), well-above the threshold for tropical cyclone development.

Throughout the day on March 12, Tomas steadily intensified, and early the next day, the JTWC upgraded the storm to a Category 1 equivalent hurricane with winds of 120 km/h (75 mph). Convective banding substantially increased on March 13, allowing Tomas to become the fourth severe tropical cyclone of the season early the next morning. Around the same time, the JTWC assessed the storm to have attained winds of 155 km/h (95 mph), ranking it as a Category 2 cyclone. By the afternoon of March 14, Tomas had developed a banding-eye feature surrounded by deep convection. At this point, the FMS assessed the storm to have winds of 150 km/h (95 mph) and a pressure of 950 hPa (mbar). The JTWC also noted further intensification, upgrading Tomas to a Category 3 equivalent storm. As it passed near Vanua Levu on March 15, the cyclone attained its peak intensity with winds of 175 km/h (110 mph) and a pressure of 930 hPa (mbar) according to the FMS. At the same time, the Joint Typhoon Warning Center assessed it as a Category 4 equivalent storm with 1-minute sustained winds of 215 km/h (135 mph).

On March 16, Tomas moved out of FMS's area of responsibility, who passed the primary warning responsibility for Tomas to New Zealand's MetService. Tomas extratropical remnants were last noted on March 20, after they had moved across 120°W and out of MetService's area of responsibility.

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