Tropical Storm Ampil moved over Okinawa on Friday night. At 11:00 p.m. EDT on Friday the center of Tropical Storm Ampil was located at latitude 27.3°N and longitude 127.4°E which put it about 25 miles (40 km) north-northwest of Okinawa. Ampil was moving toward the northwest at 21 m.p.h. (34 km/h). The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h). The minimum surface pressure was 990 mb.
Drier air continued to circulated around Tropical Storm Ampil on Friday and the drier air prevented Ampil from intensifying. Several bands of stronger thunderstorms were occurring northeast of the center of circulation and the strongest winds were occurring in those bands. The bands in other parts of Tropical Storm Ampil consisted primarily of the showers and low clouds. There was a distinct low level center of circulation, but there were few thunderstorms near the center. Winds to tropical storm force extended out about 160 miles (260 km) from the center.
Tropical Storm Ampil is unlikely to intensify significantly before it makes landfall in China. Ampil will move over water where the Sea Surface Temperature is near 28°C. So, there will be enough energy in the ocean to support intensification. There is a chance for some intensification on Saturday, if more thunderstorms develop near the center of circulation. However, the drier air will inhibit the formation of taller thunderstorms and that will limit possible intensification..
Tropical Storm Ampil will move south of a subtropical ridge over the Western North Pacific Ocean. The ridge will steer Ampil quickly toward the northwest. On its anticipated track Tropical Storm Ampil will move quickly away from Okinawa and the Ryukyu Islands. Ampil could approach the coast of China near Shanghai in about 24 hours. Tropical Storm Ampil will bring gusty winds and locally heavy rain to the region of China around Shanghai.
Elsewhere over the Western North Pacific Ocean Tropical Depression 13W formed west of northern Luzon. At 11:00 p.m. EDT on Friday the center of Tropical Depression 13W was located at latitude 18.0°N and longitude 118.9°E which put it about 140 miles (225 km) west of Laoag, Philippines. The maximum sustained wind speed was 35 m.p.h. (55 km/h) and there were wind gusts to 45 m.p.h. (75 km/h). The minimum surface pressure was 998 mb. The depression could bring locally heavy rain and cause flash floods over Luzon during the weekend.