Ships were told to return to port to take shelter from the wind, and the center also urged people against large gatherings both indoors and outdoors.
In Japan, the typhoon lashed Okinawa and nearby islands with heavy rain and fierce winds, threatening flooding and grounding more than 100 flights connecting the islands and parts of the main southern island of Kyushu.
Footage on Japan's NHK national television showed trees violently shaken by the storm, with fierce rainfall hitting the pavement. A greenhouse for mangoes on Ishigaki Island was knocked down. On the main Okinawa island, two elderly people fell down and were slightly injured, according to media reports.
Officials said the slow-moving typhoon could add to rainfall and risks of flooding in the southern region where dense rain clouds have been stuck.