Tropical Storm Jangmi continued to intensify over the Western North Pacific Ocean on Friday. At 5:00 p.m. EDT on Friday the center of Tropical Storm Jangmi was located at latitude 17.0°N and longitude 130.4°E which put the center about 705 miles (1135 km) south-southeast of Okinawa. Jangmi was moving toward the west-northwest at 12 m.p.h. (19 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 989 mb.
Tropical Storm Jangmi continued to intensify as it moved over the Western North Pacific Ocean south-southeast of the Ryukyu Islands on Friday. The inner end of a rainband wrapped around the center of Jangmi’s circulation. Other bands of showers and thunderstorms were revolving around the center of Tropical Storm Jangmi. Storms near the center of Jangmi generated upper level divergence that pumped mass away from the tropical storm. The removal of mass caused the surface pressure to decrease.
The circulation around Tropical Storm Jangmi was large. Winds to tropical storm force extended out 185 miles (295 km) from the center of Jangmi’s circulation.
Tropical Storm Jangmi will move through an environment favorable for intensification during the next 24 hours. Jangmi will move over water where the Sea Surface Temperatures are near 29°C. It will move under the middle of an upper level ridge that is south of Japan. The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear. Tropical Storm Jangmi will intensify during the next 24 hours. Jangmi is likely strengthen to a typhoon.
Tropical Storm Jangmi will move around the western end of a high pressure system that is over the Western North Pacific Ocean. The high pressure system will steer Jangmi toward the northwest during the next 24 hours. On its anticipated track, Tropical Storm Jangmi will approach the southern Ryukyu Islands in 48 hours.
Tropical Storm Jangmi is likely to be a typhoon when it approaches the southern Ryukyu Islands. Jangmi will bring strong winds and locally heavy rain to the Ryukyu Islands. Heavy rain is could cause flash floods in some locations.