Former Tropical Storm Nakri strengthened into a typhoon and started to move toward Vietnam on Friday. At 4:00 p.m. EST on Friday the center of Typhoon Nakri was located at latitude 12.9°N and longitude 114.9°E which put it about 395 miles (635 km) east of Quy Nhon, Vietnam. Nakri was moving toward the west at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 75 m.p.h. (120 km/h) and there were wind gusts to 90 m.p.h. (145 km/h). The minimum surface pressure was 977 mb.
The distribution of thunderstorms around Typhoon Nakri was asymmetrical. A broken ring of showers and thunderstorms surrounded the center of Nakri. The strongest thunderstorms were in the southern portion of the ring. Most of the strongest rainbands were in the southern half of the typhoon, although there was one strong rainband along the northern periphery of the circulation. Many of the other bands on the eastern and northern sides of Typhoon Nakri consisted primarily of showers and lower clouds. It appeared that sinking, drier air was limiting the development of thunderstorms in the northern half of the circulation.
In spite of the effects of the drier air, the size of the circulation around Typhoon Nakri increased on Friday. Winds to typhoon force extended out 45 miles (75 km) from the center of circulation. Winds to tropical storm force extended out 175 miles (280 km) from the center.
Typhoon Nakri will be moving through an environment marginally favorable for intensification during the next 12 to 24 hours. Nakri will move over water where the Sea Surface Temperature is near 28°C. It will move around the southern side of an upper level ridge over southeast Asia and the South China Sea. The ridge will produce easterly winds which will blow toward the top of the circulation. Those winds will cause moderate vertical wind shear which will inhibit intensification. Drier air to the north of Typhoon Nakri will also inhibit intensification. Nakri is likely to maintain its intensity during the next day or so, but it could start to weaken if the wind shear increases or more drier air sinks over the circulation.
The ridge over southeast Asia and the South China Sea will steer Typhoon Nakri toward the west during the next two to three days. On its anticipated track Typhoon Nakri could approach the coast of Vietnam in about 48 hours. Typhoon Nakri could bring gusty winds and a storm surge for the central coast of Vietnam. Nakri could drop locally heavy rainfall when it moves inland and flash floods could occur in some locations.
Elsewhere over the Western North Pacific Ocean, Tropical Storm Halong was speeding away from Miami Tori Shima, Japan. At 4:00 p.m. EDT on Friday the center of Tropical Storm Halong was located at latitude 30.9°N and longitude 161.1°E which put it about 580 miles (935 km) northeast of Minami Tori Shima, Japan. Halong was moving toward the northeast at 14 m.p.h. (22 km/h). The maximum sustained wind speed was 65 m.p.h. (105 km/h) and there were wind gusts to 80 m.p.h. (130 km/h). The minimum surface pressure was 983 mb.
Tropical Storm Matmo made landfall on the southern coast of Vietnam near Quy Nhon on Wednesday. At 5:00 p.m. EDT on Wednesday the center of Tropical Storm Matmo was located at latitude 13.7°N and longitude 108.2°E which put it about 50 miles (80 km) west of Quy Nhon, Vietnam. Matmo was moving toward the west at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 65 m.p.h. (105 km/h). The minimum surface pressure was 944 mb.
Tropical Storm Matmo organized quickly as it approached the coast of southern Vietnam on Wednesday. The inner end of a band of showers and thunderstorms wrapped about 75% around the center of circulation and an eye appeared to be forming. Thunderstorms near the center of Matmo were generating upper level divergence which was pumping mass away from the tropical storm. The removal of mass allowed the pressure to decrease which caused the wind speed to increase. The maximum sustained wind speed at the time when Tropical Storm Matmo made landfall was 60-65 m.p.h. (95-105 km/h).
Tropical Storm Matmo began to weaken after the center moved over land. The strongest winds were occurring in bands of showers and thunderstorms in the eastern half of Matmo over the South China Sea. Wind speeds in the parts of the circulation what were over land were less. Tropical Storm Matmo will continue to move westward during the next several days. Matmo will drop heavy rain over parts of southern Vietnam, Cambodia, southern Laos, and Thailand. Heavy rain could cause floods in some locations.
Tropical Storm Matmo formed over the South China Sea east of Vietnam on Tuesday. At 5:00 p.m. EDT on Tuesday the center of Tropical Storm Matmo was located at latitude 12.7°N and longitude 112.2°E which put it about 60 miles (260 km) east of Dai Lanh, Vietnam. Matmo was moving toward the west at 16 m.p.h. (26 km/h). The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h). The minimum surface pressure was 998 mb.
More thunderstorms developed near the center of a low pressure system over the South China Sea east of Vietnam on Tuesday and the Japan Meteorological Agency designated the system as Tropical Storm Matmo. The circulation around Tropical Storm Matmo was still organizing. Thunderstorms were forming around the center of circulation. Bands of showers and thunderstorms were developing in the northern and western parts of the tropical storm. Bands in the eastern and southern parts of the circulation consisted primarily of showers and lower clouds. Storms near the center of circulation were beginning to generate upper level divergence.
Tropical Storm Matmo will move through an environment favorable for intensification during the next 12 to 18 hours. Matmo will move over water where the Sea Surface Temperature is near 29°C. It will move under the west part of an upper level ridge where the winds are weaker and where there is less vertical wind shear. Tropical Storm Matmo could strengthen during the next 12 hours. Matmo will near the coast of Vietnam in about 12 hours and it will start to weaken when the center moves over land.
Tropical Storm Matmo will move south of a ridge of high pressure over the Western North Pacific Ocean. The ridge will steer Matmo toward the west. On its anticipated track Tropical Storm Matmo could make landfall on the coast of Vietnam between Dai Lanh and Quy Nhon in 12 to 18 hours. Matmo will bring gusty winds to the coastal regions of southern Vietnam. Tropical Storm Matmo could also drop heavy rain over parts of southern Vietnam, Cambodia, southern Laos and eastern Thailand. Heavy rain could cause floods in some locations.