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Two tropical cyclones occurred over the western North Pacific and South China Sea in May 2011.
Aere formed as a tropical depression over the western North Pacific about 660 km east-southeast of Manila on 7 May. Moving west-northwestwards, it intensified into a tropical storm that afternoon. Aere moved northwestwards on 8 May and reached its peak intensity with an estimated maximum sustained wind of 85 km/h near its centre. It moved northwards across the northeastern part of Luzon on 9 May, turned to move northeastwards and then weakened into a tropical depression over the seas to the southeast of Taiwan on 10 May. Aere moved across the Ryukyu Islands the following day and dissipated over the seas south of Japan on 12 May. According to press reports, Aere triggered landslides in the northeastern part of Luzon, where at least three people were killed and over 100 000 people evacuated.
Songda formed as a tropical depression over the western North Pacific about 340 km east-southeast of Yap on 20 May and moved generally west-northwestwards. It intensified into a tropical storm on 22 May and a severe tropical storm the next day. Songda intensified further into a typhoon and turned to move northwestwards on 25 May. It gradually intensified into a super typhoon over the Pacific to the east of the Philippines on 26 May, reaching its peak intensity with an estimated maximum sustained wind of 205 km/h near its centre. Songda turned to move northwards over the seas to the southeast of Taiwan and weakened into a severe typhoon on 27 May. It moved northeastwards across the Ryukyu Islands, weakening first into a typhoon the next day and became extratropical over southern Honshu, Japan on 29 May. According to press reports, one person was killed, one missing and 67 people injured in Japan during the passage of Songda. Electricity supply to a total of 270,000 households was interrupted in Okinawa.
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