Latest update from the National Center for Hydro-Meteorological Forecasting, at 13:00 on August 23, the center of storm No. 4 was located at about 20.6 degrees North latitude - 108.1 degrees East longitude, over the sea area north of Bach Long Vi special zone, about 155km east-southeast of Quang Ninh, about 150km east of Hai Phong. The strongest wind near the center of the storm is strong at level 8-9 (62-88 km/h), gusting at level 10-11.
Forecast for the next 24 hours, the storm will move in a South-Southeast direction, at a speed of about 3 km/h.
By 13:00 on August 24, the storm's center will be located at about 20.1 degrees North latitude - 108.4 degrees East longitude; over the sea area east of Bach Long Vi special zone. Wind intensity is strong at level 9, gusting at level 11.
Forecast for the next 48 hours, the storm will move in an East-Northeast direction, at a speed of 3-5 km/h.
By 13:00 on August 25, the storm's center will be located at about 20.3 degrees North latitude - 109.2 degrees East longitude; in the area east of the Gulf of Tonkin, about 160km east of Bach Long Vi special zone. Wind intensity level 9, gusts level 11.
Forecast for the next 72 hours, the storm will move in a North-Northeast direction at a speed of 5-10 km/h. By 13:00 on August 26, the storm's center will be located at about 21.8 degrees North latitude - 110.0 degrees East longitude; on land in the Southwest of Guangxi province (China). The intensity gradually weakens into a tropical depression, wind force level 6-7, gusts level 9.
From 72 to 96 hours later, the tropical depression is likely to move northward, then North-Northwest, moving 5-10km per hour and gradually weakening into a low pressure area.
Regarding the impact of the storm at sea, the Gulf of Tonkin area (including special zones: Bach Long Vi, Van Don, Co To, Cat Hai; Hon Dau island), the coastal sea area of Quang Ninh and Hai Phong provinces has strong winds at level 6-7, the area near the storm center passing through strong at level 8-9, gusts at level 10-11; sea waves are 2-4m high; very rough seas.
The coastal mainland of Quang Ninh and Hai Phong provinces has strong winds of level 6, gusts of level 8. Strong winds can blow off roofs, damage temporary structures, break down green trees, billboards; affecting electricity and traffic systems.
Regarding heavy rain, the Northeast region, the south of Phu Tho and Thanh Hoa provinces from the afternoon of August 23 to the end of August 24 will have common rainfall of 30-70mm, locally over 150mm; especially Bac Ninh, Quang Ninh, Hai Phong, Hung Yen, Ninh Binh, Thanh Hoa commonly 60-120mm, locally over 250mm. From the night of August 24, heavy rain tends to gradually decrease.
Heavy rain may cause flooding in urban areas, industrial parks and low-lying areas; increasing the risk of floods on small rivers and streams, flash floods and landslides in mountainous areas.
Due to the impact of storm circulation, it is necessary to prevent the risk of thunderstorms, tornadoes and strong gusts of wind.
