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One tropical cyclone, named Sonamu, occurred over the Philippines and South China Sea in January 2013.
Sonamu formed as a tropical depression over Sulu Sea about 650 km south of Manila on 3 January and moved westwards across the southwestern part of the Philippines. Sonamu entered the southern part of the South China Sea on 4 January, intensified into a tropical storm and moved west-southwestwards, reaching its peak intensity on the following day to the south-southwest of Nasha with an estimated maximum sustained wind of 85 km/h near its centre. It became slow moving over the southern part of the South China Sea on 7 January. Sonamu weakened into a tropical depression and turned to move southeastwards on 8 January. Sonamu finally dissipated over the southern part of the South China Sea to the northwest of Sarawak on 9 January.
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