Updated from the National Center for Hydro-Meteorological Forecasting, at 4:00 p.m. on October 4, the center of storm No. 11 Matmo was at about 18.5 degrees north latitude; 114.8 degrees east longitude, in the northern East Sea, about 440 km east-southeast of Hainan Island (China).
The strongest wind near the storm center is level 12 (118-133 km/h), gusting to level 15. The storm is moving west-northwest at a speed of about 25 km/h.
Storm rapidly weakens as it enters the Gulf of Tonkin
It is forecasted that in the next 24 hours, the storm will move west-northwest, at a speed of about 20-25 km/h and is likely to strengthen.
At 4:00 p.m. on October 5, the center of the storm was at about 20.7 degrees north latitude; 109.8 degrees east longitude, in the western area of the Lusi Peninsula (China), about 250 km southeast of Quang Ninh. Strong wind level 12, gust level 15.
The dangerous area in the East Sea is north of latitude 16.5 degrees north - west of longitude 118 degrees east. Level 3 natural disaster risk, the affected area is the northern East Sea.
It is forecasted that in the next 36 hours, the storm will move west-northwest, at a speed of about 20 km/h, entering the northern area of the Gulf of Tonkin and gradually weakening.
At 4:00 a.m. on October 6, the center of the storm was at about 21.5 degrees north latitude; 108.3 degrees east longitude, on the coast of Quang Ninh - Hai Phong. Strong wind level 9, gust level 12.
The danger zone is north of the 18-way north-east of the 113-way east line. Level 3 natural disaster risk, affected areas include the northwest sea of the northern East Sea, the northern sea of the Gulf of Tonkin and the coastal mainland from Quang Ninh to Hung Yen.
At around dawn on October 6, storm No. 11 is forecast to make landfall in Quang Ninh.
It is forecasted that in the next 48 hours, the storm will continue to move west-northwest, at a speed of about 20 km/h, making landfall and gradually weakening.
At 4:00 p.m. on October 6, the center of the tropical depression was at about 22.3 degrees north latitude; 106.1 degrees east longitude, in the northern mountainous region of the North. Strong wind level 6, gust level 8.
The danger zone is north of latitude 19 degrees north - east of longitude 112 degrees east. Level 3 natural disaster risk, the affected area is the northern sea area of the Gulf of Tonkin and the mainland along the coast from Quang Ninh to Hung Yen.
It is forecasted that in the next 60 hours, the tropical depression will move west-northwest at a speed of about 15-20 km/h, moving deep into the western mountainous areas of the North and weakening into a low pressure area. At 4:00 a.m. on October 7, the center of the tropical depression was at about 22.8 degrees north latitude; 103.7 degrees east longitude.
Quang Ninh to Hung Yen focuses on strong winds, the midlands and mountainous areas of the North focus on heavy rain
Regarding the impact of the storm at sea, the northern East Sea area has strong winds of level 8-10, the area near the storm's eye has level 11-13, gusting to level 16. The waves are 4-6 m high, near the storm center 6-8 m, the sea is very rough (extreme destructive power, extremely strong waves, can sink heavy ships).
From the afternoon of October 5, the sea area east of the northern part of the Gulf of Tonkin (including Bach Long Vi special zone) will gradually increase to level 6-7, then increase to level 8-9. From the evening of October 5, the northern area of the Gulf of Tonkin (including the special areas of Bach Long Vi, Van Don, Co To, Cat Hai and Hon Dau island) will gradually increase to level 8-9, near the storm's eye level 10-11, gusting to level 14, waves 3-5 m high, rough seas, very dangerous for ships and boats.
Storm surge in coastal areas and islands of Quang Ninh - Hai Phong is 0.4-0.6 m high. It is necessary to be on guard against flooding in low-lying coastal areas, river mouths due to rising water and big waves from the afternoon and evening of October 5.
The weather at sea and in coastal areas during the storm is extremely dangerous, unsafe for any vehicles or works operating in the danger zone such as tourist boats, transport ships, aquaculture cages, dykes, embankments, coastal roads. Vehicles are likely to overturn or be destroyed; flooding may occur due to strong winds, large waves and rising sea levels.
On land, from the night of October 5, coastal areas from Quang Ninh to Hung Yen will gradually increase to level 6-7, near the storm center will level 8-9, gusting to level 10-11 (the wind can break branches, blow roofs, cause damage to houses, cannot go back to the wind). The deep inland area east of the Northeast will have strong winds of level 4-5, some places will have level 6, gusting to level 7-8.
Regarding heavy rain, from the night of October 5 to the end of the night of October 7, the mountainous and midland areas of the North will have heavy rain, with common rainfall of 150-250 mm, locally over 400 mm.
The Northern Delta and Thanh Hoa have moderate rain, heavy rain, common rainfall of 70-150 mm, some places over 200 mm.
The Hanoi area is less likely to be affected by storm winds; it is forecasted that from early morning of October 6 to the end of October 7, there will be moderate rain, heavy rain, common rainfall of 70-120 mm, some places over 150 mm.
Due to the wide influence of the storm's circulation, it is necessary to be on guard against the risk of thunderstorms, tornadoes and strong gusts of wind both before and during the storm's landfall.
