Storm No. 11 has entered the Northern Gulf of Tonkin, the Northern midlands have places with very heavy rain over 400mm.

Photo caption — The movement of storm No. 11 at 8:00 p.m. on October 5. Photo: VNA

At 7:00 p.m., the center of the storm was at about 21.2 degrees North latitude; 109.5 degrees East longitude, about 190km East Southeast of Mong Cai ( Quang Ninh ). The strongest wind near the center of the storm was level 11-12 (103-133km/h), gusting to level 15. Moving in the West Northwest direction, speed about 20km/h.

At 7:00 a.m. on October 6, the storm moved into the mainland of Guangxi province (China), with strong winds of level 8, gusting to level 10. The storm moved in the West-Northwest direction at a speed of about 20 km/h. The affected areas were the Northwestern sea area of the North East Sea, the North Gulf of Tonkin and the coastal mainland area from Quang Ninh to Hung Yen, including Lang Son province, the Northeast of Bac Ninh province and the East of Cao Bang province.

By 7:00 p.m. on October 6, the storm moved into the northern mountainous region and weakened into a low-pressure area with winds down to below level 6. The storm continued to move in the West-Northwest direction at a speed of about 20 km/h. The affected areas are the northern Gulf of Tonkin and the coastal mainland from Quang Ninh to Hung Yen, including Lang Son province, the northeast of Bac Ninh province and the east of Cao Bang province. Disaster risk level: level 3.

Due to the storm's influence, the Northwestern sea area of the North East Sea has strong winds of level 8-9, gusts of level 11, waves 4-6m high, very rough seas (very dangerous for ships).

Northern Bac Bo Gulf area (including Bach Long Vy, Van Don, Co To, Cat Hai and Hon Dau island) strong winds level 7-9, near the storm center level 10-12, gust level 15, waves 2.0-4.0m high, near the storm center 3.0-5.0m, rough seas (very dangerous for ships).

Coastal areas and islands in Quang Ninh - Hai Phong provinces have storm surges of 0.4-0.6m. Beware of flooding in low-lying coastal areas and river mouths due to surges and high waves on the night of October 5 and early morning of October 6. Warning: Weather at sea and in coastal mainland areas during the storm is extremely dangerous, unsafe for any vehicles or structures operating in dangerous areas such as: tourist boats, passenger ships, transport ships, cages, rafts, aquaculture areas, dykes, embankments, coastal routes. Vehicles are highly likely to capsize and be destroyed; flooded due to strong winds, high waves and rising sea levels.

On land, from the night of October 5 to noon on October 6, on land in coastal areas from Quang Ninh to Hung Yen and Lang Son province, winds will gradually increase to level 6-7, near the storm center, level 8-9, gusting to level 11-12 (winds can break tree branches, blow off roofs, causing damage to houses, making it impossible to go against the wind). Inland areas in the Northeast, winds will increase to level 4-5, in some places to level 6, gusting to level 7-8.

Communes/wards in the northeastern region of Quang Ninh province are likely to have strong winds of level 8-9, gusting to level 11-12; the remaining communes/wards of Quang Ninh province and the coastal area of Hai Phong are likely to have strong winds of level 7-8, gusting to level 10; the coastal communes/wards of Hung Yen province and the northern border communes of Lang Son province are likely to have strong winds of level 6-7, gusting to level 9; the northeastern region of Bac Ninh province (formerly Bac Giang province) and the eastern region of Cao Bang province are likely to have strong winds of level 6, gusting to level 8.

In addition, from the night of October 5 to the end of the night of October 7, in the mountainous and midland areas of the North, there will be heavy rain, with rainfall ranging from 150-250mm, and locally very heavy rain over 400mm. Warning of the risk of heavy rain (over 150mm/3 hours); in the Northern Delta and Thanh Hoa, there will be moderate to heavy rain with rainfall ranging from 70-150mm, and locally very heavy rain over 200mm.

Hanoi area is less likely to be affected by storms, need to be on guard against thunderstorms, whirlwinds and strong gusts. It is forecasted that from early morning on October 6 to the end of October 7, there will be moderate to heavy rain, with common rainfall of 70-120mm, locally over 150mm.

Due to the influence of the wide storm circulation, it is necessary to guard against the risk of thunderstorms, tornadoes and strong gusts of wind both before and during the storm's landfall.