The North welcomes the Northeast monsoon, in mountainous areas the temperature drops to 15 degrees Celsius.

According to the National Center for Hydro-Meteorological Forecasting, on the afternoon of October 18, a cold air mass is moving from the North to the South.

Around October 20, this cold air mass will affect the Northeast region, then affect the North Central region and some places in the Northwest.

Northeast wind on land is strong at level 2-3. Coastal areas from Quang Ninh to Thai Binh, due to the influence of cold air combined with storm circulation No. 5, have strong winds at level 6, gusting at level 7-8.

The North and North Central regions are cold at night and in the morning, while the northern mountainous regions are cold at night and in the early morning. During this cold air mass, the lowest temperature in the North and North Central regions is generally between 19-22 degrees Celsius, while in the mountainous regions of the North it is generally between 16-19 degrees Celsius, and in some high mountainous regions it is below 15 degrees Celsius.

From October 20, due to the influence of storm No. 5 combined with cold air, the Gulf of Tonkin (including Co To and Bach Long Vi island districts) has strong winds of level 6-7, the area near the storm's center has strong winds of level 8, gusts of level 10, waves 3-5m high, rough seas.

Regarding the development of storm No. 5, at 4:00 p.m. on October 18, the center of the storm was at about 17.7 degrees North latitude; 108.9 degrees East longitude, in the sea south of Hainan Island (China).

The strongest wind near the storm center is level 8 (62-74km/h), gusting to level 10. Moving in the North Northwest direction at a speed of about 10km/h.

At 4:00 p.m. on October 19, the eye of the storm was located at approximately 19.9 degrees North latitude, 108 degrees East longitude, in the Gulf of Tonkin. The strongest wind near the eye of the storm was level 9, gusting to level 11.

The storm is moving northwest at about 10km/h and is likely to strengthen.

Dangerous areas affected by the storm: North of latitude 16 degrees North, West of longitude 110.5 degrees East. The Gulf of Tonkin, the sea area from Quang Tri to Quang Nam has a level 3 natural disaster risk.

At 4:00 p.m. on October 20, the eye of the storm was located at approximately 20.3 degrees North latitude, 107.5 degrees East longitude, in the Gulf of Tonkin. The strongest wind near the eye of the storm was level 8, gusting to level 10.

The storm is moving in a North-Northwest direction at a speed of about 5km/h. Dangerous areas affected by the storm: North of latitude 18 degrees North, West of longitude 110.5 degrees East. The Gulf of Tonkin has a level 3 natural disaster risk.

At 4:00 p.m. on October 21, the eye of the storm was located at approximately 19 degrees North latitude, 107 degrees East longitude, in the Gulf of Tonkin. The strongest winds near the eye of the storm were below level 6.

The storm moved to the South Southwest at about 5km/h, gradually weakening into a tropical depression, then a low pressure area.

Dangerous areas affected by the storm: North of latitude 17.5 degrees North, West of longitude 109 degrees East. The Gulf of Tonkin has a level 3 natural disaster risk.

Due to the storm's influence, on the afternoon of October 18, the sea area from Quang Tri to Quang Nam had strong winds of level 6-7, near the storm's center had strong winds of level 8-9, gusts of level 11, and very rough seas.

The Gulf of Tonkin (including Co To and Bach Long Vi islands) from the night of October 18 will have winds gradually increasing to level 6-7, near the storm center at level 8-9, gusting to level 11. The sea is very rough.

From early morning on October 20, the coastal areas from Quang Ninh to Thai Binh have seen winds gradually increasing to level 6, gusting to level 7-8. All boats, anchorages, aquaculture areas, and sea dykes in this area are affected by strong winds and big waves.

From the evening of October 18 to the morning of October 19, the area from Quang Tri to Thua Thien-Hue will have moderate rain, heavy rain, and in some places very heavy rain.

From the night of October 19 to the night of October 21, coastal areas, the Southern region of the Northern Delta, the Northeast region of the North and the North Central provinces are likely to experience moderate rain, with heavy to very heavy rain in some places.

The Prime Minister issued Official Dispatch No. 973/CD-TTg, requesting the National Steering Committee for Natural Disaster Prevention and Control, the National Committee for Incident Response, Natural Disaster Response and Search and Rescue, ministers, and chairmen of provincial and municipal People's Committees to continue to focus on directing and implementing measures to respond to floods, tropical depressions, and storms to ensure the safety of people's lives, and to prevent human losses due to negligence, subjectivity, passivity, and surprise in directing and responding, and to minimize damage to people's and state's property.

Weather in the regions on the night of October 17 and the day of October 18: In the Northwest, there will be some rain at night and sunny days. Light wind. Lowest temperature 19-22 degrees Celsius, some places below 19 degrees Celsius. Highest temperature 29-32 degrees Celsius, some places above 32 degrees Celsius.

In the Northeast, there will be rain in some places at night and sunny in the afternoon. Northeast wind level 2-3. Lowest temperature 23-26 degrees Celsius, in mountainous areas below 23 degrees Celsius. Highest temperature 29-32 degrees Celsius, in some places above 32 degrees Celsius.

Hanoi capital: no rain at night, sunny in the afternoon. Northeast wind level 2-3. Lowest temperature 23-25 ​​degrees Celsius. Highest temperature 30-32 degrees Celsius.

Provinces from Thanh Hoa to Thua Thien-Hue are cloudy, with scattered showers and thunderstorms in the North; moderate rain, heavy rain, and very heavy rain and thunderstorms in the South at night and in the morning; there is a possibility of tornadoes, lightning, and strong gusts of wind during thunderstorms. North to Northwest winds are at level 2-3. Lowest temperature is 22-25 degrees Celsius. Highest temperature is 29-32 degrees Celsius.

Provinces and cities from Da Nang to Binh Thuan have scattered showers and thunderstorms; thunderstorms are likely to cause tornadoes, lightning, and strong gusts of wind. West to Southwest winds at level 2-3. Lowest temperature 23-26 degrees Celsius. Highest temperature 30-33 degrees Celsius.

In the Central Highlands, there will be scattered showers and thunderstorms at night and sunny days. In the late afternoon and evening of October 19, there will be scattered showers and thunderstorms, with some areas having moderate to heavy rain. There is a possibility of tornadoes, lightning and strong gusts of wind during thunderstorms. Southwest wind level 2-3. Lowest temperature 20-23 degrees Celsius. Highest temperature 27-30 degrees Celsius.

In the South, there will be scattered showers and thunderstorms at night and sunny days. In the late afternoon and evening of October 19, there will be scattered showers and thunderstorms, with some areas having moderate to heavy rain. There is a possibility of tornadoes, lightning, and strong gusts of wind during thunderstorms. Southwest wind level 2-3. Lowest temperature 23-26 degrees Celsius. Highest temperature 30-33 degrees Celsius, some places above 33 degrees Celsius.