Typhoon Choi-Wan triggers tropical storm warnings for US commonwealth of Northern Mariana Islands

Microwave imagery from NASA's Aqua satellite revealed extremely high thunderstorms in Typhoon Choi-Wan as it began passing the island of Sai-Pan in the Western Pacific Ocean. The U.S. National Weather Service has already issued a tropical storm warning and a typhoon watch for Tinian, Saipan and Agrihan in the Northern Mariana Islands.

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