Tropical Storm Nangka made landfall on the coast of northern Vietnam on Wednesday morning. Nangka weakened to a tropical depression after the center moved over land. At 8:00 a.m. EDT on Wednesday the center of Tropical Depression Nangka was located at latitude 20.0°N and longitude 105.0°E which put it about 80 miles (130 km) southwest of Hanoi, Vietnam. Nangka was moving toward the west at 12 m.p.h. (19 km/h). 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 1002 mb.
The center of Tropical Storm Nangka made landfall on the coast of Vietnam about 70 miles (110 km) southeast of Hanoi on Wednesday morning. Nangka brought gusty winds and heavy rain to the northern coast of Vietnam. Nangka quickly weakened to a tropical depression when it moved westward over northern VIetnam. Bands of showers and thunderstorms dropped locally heavy rain over parts of northern Vietnam.
Tropical Depression Nangka will continue to move toward the west until the circulation spins down over northern Laos on Thursday. Nangka will continue to drop locally heavy rain over parts of northern Vietnam and northern Laos during the next 24 hours. Heavy rain could cause flash floods in some locations.
Tropical Storm Nangka brought wind and rain to Hainan Island on Tuesday. At 11:00 a.m. EDT on Tuesday the center of Tropical Storm Nangka was located at latitude 19.1°N and longitude 110.0°E which put it about 70 miles south-southwest of Haikou, China. Nangka was moving toward the west-northwest at 9 m.p.h. (15 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 987 mb.
The center of Tropical Storm Nangka moved directly across Hainan Island on Tuesday. Nangka strengthened before it made landfall on the east coast of Hainan. Winds to tropical storm force extended out 200 miles (320 km) from the center of Tropical Storm Nangka. So, Nangka may have produced tropical storm force winds over much of Hainan. Thunderstorms near the center of circulation and in bands revolving around the center were dropping heavy rain over parts of Hainan. The heavy rain was likely to cause flash floods in some locations.
Tropical Storm Nangka will weaken while it moves across Hainan. Nangka will move into an environment favorable for intensification for about 12 hours when it moves west of Hainan Island. Nangka will move over water where the Sea Surface Temperature is near 29°C. It will move under the southern part of an upper level ridge over eastern Asia. The ridge will produce easterly winds which will blow toward the top of the circulation. Those winds will cause some vertical wind shear, but the shear will not be strong enough to prevent Tropical Storm Nangka from strengthening again.
Tropical Storm Nangka will move south of a high pressure system over eastern Asia. The high will steer Nangka toward the west during the next 48 hours. Tropical Storm Nangka will move west of Hainan Island in about 6 hours. On its anticipated track Nangka will make landfall on the northern coast of Vietnam southeast of Hanoi in about 18 hours. Tropical Storm Nangka will bring gusty winds and locally heavy rain to northern Vietnam. Heavy rain will cause flash floods in some locations.
Tropical Storm Wipha formed south of Macau late on Tuesday. At 11:00 p.m. EDT on Tuesday the center of Tropical Storm Wipha was located at latitude 18.8°N and longitude 112.6°E which put it about 175 miles (285 km) south of Macau. Wipha was moving toward the northwest at 6 m.p.h. (10 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 994 mb.
The circulation around Tropical Storm Wipha was large, but Wipha did not have a well formed inner core. Winds to tropical storm force extended out about 200 miles (320 km) from the center of circulation. However, there were no strong thunderstorms near the center. Stronger thunderstorms were occurring in bands well to the south and east of the center of circulation. Bands northwest of the center consisted primarily of showers and lower clouds.
The large lower level circulation of Tropical Storm Wipha was just to the southeast of an upper low over the northwestern part of the South China Sea. The upper low was circulating some drier air over the northwestern part of Wipha. It was also causing some vertical wind shear. The drier air and wind shear were inhibiting the formation of thunderstorms in the northwestern part of Tropical Storm Wipha.
Tropical Storm Wipha will move through an environment somewhat favorable for intensification during the next 24 hours. Wipha will move over water where the Sea Surface Temperature is near 30°C. The upper low will continue to inhibit the strengthening of Tropical Storm Wipha. If thunderstorms begin to develop near the center of Wipha, then the tropical storm could strengthen.
Tropical Storm Wipha will move around the southwestern part of a subtropical ridge over the Western North Pacific Ocean. The ridge will steer Wipha toward the northwest during the next 24 hours. On its anticipated track the center of Tropical Storm Wipha will be near the northern part of Hainan Island and the south coast of China in 18 to 24 hours. Wipha could move more toward the west when it reaches the Gulf of Tongking. Although Tropical Storm Wipha will bring gusty winds to southern China and northern Vietnam, locally heavy rain and the potential for floods will be greater risks.