Tropical Storm Damrey formed west of the Philippines on Wednesday. At 11:00 p.m. EDT on Wednesday the center of Tropical Storm Damrey was located at latitude 12.8°N and longitude 116.4°E which put it about 615 miles (990 km) east-southeast of Da Nang, Vietnam. Damrey was moving toward the west-northwest at 13 m.p.h. (21 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1000 mb.
An area of low pressure slowly organized as it moved through the Philippines during the past several days. A center of circulation developed and bands of showers and thunderstorms formed and started to revolve around the core of the low pressure system. The Japan Meteorological Agency designated the system as Tropical Storm Damrey.
The circulation of Tropical Storm Damrey is still organizing. More thunderstorms formed near the center of circulation. A primary rainband wrapped around the western and southern sides of the center. Additional bands of showers and thunderstorms formed outside the core of the circulation. Storms in the core of Damrey began to generate upper level divergence which pumped mass away from the tropical storm and allowed the surface pressure to decrease.
Tropical Storm Damrey will be moving through an environment that will be favorable for intensification. Damrey will move over water where the Sea Surface Temperature will be near 28°C. An upper level ridge north of Tropical Storm Damrey is producing easterly winds which are blowing toward the top of the circulation. Those winds are causing some vertical wind shear, but the shear is not strong enough to prevent intensification. Tropical Storm Damrey will continue to intensify and it could become a typhoon in 24 to 36 hours.
The upper level ridge north of Damrey is steering the tropical storm toward the west-northwest and a general westerly motion is forecast. On its anticipated track Tropical Storm Damrey will move toward Vietnam. Damrey could approach the coast of Vietnam in less than 48 hours. Damrey could be a typhoon when it gets to Vietnam.