According to the National Center for Hydro-Meteorological Forecasting, due to the impact of storm No. 4, in Bach Long Vi special zone (Hai Phong) there were strong winds of level 8, gusts of level 9; Co To special zone (Quang Ninh) had strong winds of level 6, gusts of level 9; at Mong Cai station (Quang Ninh) there were strong winds of level 7, gusts of level 9; at Uong Bi station (Quang Ninh) there were strong winds of level 6; at Phu Lien station (Hai Phong) there were strong winds of level 6, gusts of level 7.
At 13:00 on August 22, the storm center was located at about 21.0 degrees North latitude - 107.9 degrees East longitude, over the sea area of Quang Ninh - Hai Phong, about 110km north of Bach Long Vi special zone. The strongest wind near the storm center was level 8 (62-74 km/h), gusting to level 10.
Forecast for the next 24 hours, the storm will move in a South direction, at a speed of about 3 km/h.
By 13:00 on August 23, the storm's center will be located at about 20.4 degrees North latitude - 107.9 degrees East longitude; in the sea area north of Bach Long Vi special zone, about 120km east of Hai Phong. Wind intensity is strong at level 8, gusting at level 10.
Forecast for the next 48 hours, the storm will move in a Southeast-east direction, at a speed of about 5 km/h.
By 13:00 on August 24, the storm's center will be located at about 20.1 degrees North latitude - 108.9 degrees East longitude; over the Northern Gulf of Tonkin area, about 130km east of Bach Long Vi special zone, about 230km east-southeast of Hai Phong. The wind intensity will maintain at level 8, gusting at level 10.
Forecast for the next 72 hours, the storm will change direction and move in a Northeast direction, at a speed of about 5 km/h.
By 13:00 on August 25, the storm's center will be located at about 21.0 degrees North latitude - 109.7 degrees East longitude; in the area west of the Leizhou peninsula (China), about 240km northeast of the Bailongwei special zone. Wind intensity is strong at level 8, gusts at level 10.
From 72 to 120 hours later, the storm is likely to move in a North-Northeast direction, moving about 5km per hour, and is likely to gradually weaken into a tropical depression.
Regarding the impact of the storm at sea, the Gulf of Tonkin area (including Bach Long Vi, Van Don, Co To, Cat Hai special zones; Hon Dau island), coastal sea areas of Quang Ninh and Hai Phong provinces have strong winds of level 6-7, near the storm center passing through strong level 8, gusts of level 10; sea waves are 2-4m high; strong rough seas.
The coastal mainland of Quang Ninh province and Hai Phong city has strong winds at level 6-7, gusts at level 8-9. 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 August 22 to the night of August 24 will have common rainfall of 100-200mm, locally over 400mm; especially Quang Ninh, Hai Phong commonly 250-350mm, locally over 600mm; Lang Son, Bac Ninh commonly 200-300mm, locally over 500mm. It is forecasted that the rain situation may continue to last after August 25.
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.
In addition, due to the impact of the storm's circulation, it is necessary to prevent the risk of thunderstorms, tornadoes and strong gusts of wind.
