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Four tropical cyclones occurred over the western North Pacific and South China Sea in October 2010. Amongst them, Megi, the first super typhoon of the year, necessitated the issuance of tropical cyclone warning signals in Hong Kong.
A tropical depression formed over the Beibu Wan about 110 km west-northwest of Sanya on 5 October and was slow moving. The tropical depression remained weak with maximum sustained winds of 45 km/h near the centre. It dissipated over the coastal areas of western Hainan on 7 October.
Megi formed as a tropical depression over the western North Pacific about 450 km west-southwest of Guam on 13 October and moved west-northwestwards. It intensified into a tropical storm that evening. On 15 October, Megi moved northwestwards and gradually intensified into a typhoon over the Pacific to the east of the Philippines. Megi moved west-northwestwards the next day. It turned to move west-southwestwards and became a super typhoon on 17 October, reaching its peak intensity with maximum sustained winds of about 230 km/h near its centre. Megi crossed Luzon on 18 October and weakened into a severe typhoon. It moved generally westwards across the South China Sea on 19 October, but turned to move generally northwards for the next four days. Megi weakened into typhoon over the northeastern part of the South China Sea on 22 October. It made landfall over the coast of Zhangpu, Fujian on 23 October and weakened into a severe tropical storm. Megi continued to move further inland and dissipated on the morning of 24 October.
A tropical depression formed over the western North Pacific about 690 km west of Wake Island on 21 October and moved west-northwestwards. The maximum sustained winds near the centre of the tropical depression were around 55 km/h. The tropical depression turned to move east-northeastwards on 23 October and dissipated over the western North Pacific to the west-northwest of Wake Island that evening.
Chaba formed as a tropical depression over the western North Pacific about 810 km north of Yap on 22 October and moved west to west-southwestwards. It turned to move northwestwards on 24 October, gradually intensifying. Chaba became a severe tropical storm on 25 October and a typhoon to the south-southeast of Rkyuyu Islands the next day. It turned north on 27 November and intensified further into a severe typhoon, reaching its peak intensity with maximum sustained winds of about 165 km/h near its centre. Chaba turned to move northeast on 28 October and gradually weakened into a severe tropical storm on 29 October. After crossing the seas to the south of Japan on 30 October, Chaba became an extra-tropical cyclone over the western North Pacific to the east of Honshu the following day.
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