According to the new weather forecast from the National Center for Hydro-Meteorological Forecasting, on the evening and night of November 17, cold air will affect the Northern and North Central regions, then affect the Central Central and South Central regions.
Weather forecast for the Northern and North Central regions will turn cold, the mountainous and midland areas of the North will be very cold, the high mountainous areas will have some places with severe cold, the Northern Delta will have some places with severe cold.
The lowest temperature in this cold air mass in the Northern Delta and North Central regions is generally from 12-15 degrees, in mountainous and midland areas from 9-12 degrees, in high mountainous areas below 5 degrees Celsius.
Hanoi weather on the night of November 17 and November 18 has rain, showers, from the night of November 17 the weather will turn cold, some places will be very cold. The lowest temperature in this cold air mass is generally 12-14 degrees Celsius.
From the evening and night of November 17 - the Northeast wind in the Gulf of Tonkin will gradually increase to level 6, then increase to level 7, sometimes level 8, gusting to level 9-10, rough seas, waves 3.0-5.0m high.
North East Sea Northeast wind gradually increases to level 7-8, gusting to level 9-10, rough seas, waves 4.0-6.0m high.
From early morning on November 18, the area from Quang Tri to Quang Ngai, the sea area north of the Central East Sea, the Northeast wind will gradually increase to level 6, sometimes level 7, gusting to level 8-9, rough seas, waves from 4.0-6.0m high.
From the evening and night of November 18, the sea area from Gia Lai to Khanh Hoa will have northeast winds gradually increasing to level 6, gusting to level 7-8, waves 3.0-5.0m high, rough seas.
People and tourists should pay attention to heavy rain causing flooding in low-lying areas, urban and industrial areas; flash floods on small rivers and streams, landslides on steep slopes. Ships should limit going out to sea when there are warnings of strong winds and big waves.

Weather forecast for tomorrow, November 18 nationwide:
Hanoi Lowest temperature: 12-15 degrees Celsius Highest temperature: 19-21 degrees Celsius Cloudy, with showers and thunderstorms.
Northeast wind level 2-3.The weather will turn cold, some places will be very cold.
Northwest Lowest temperature: 11-14 degrees Celsius, some places below 7 degrees Celsius; Lai Chau and Dien Bien 15-18 degrees Celsius Highest temperature: 19-22 degrees Celsius, some places above 22 degrees Celsius Cloudy, rain, showers and thunderstorms.
Light wind.Severe cold, some mountainous areas are severely cold.
Northeast Lowest temperature: 13-16 degrees Celsius; mountainous and midland areas 11-13 degrees Celsius, high mountainous areas below 7 degrees Celsius Highest temperature: 19-22 degrees Celsius Cloudy, rain, showers and thunderstorms in some places.
Northeast wind level 3-4; coastal level 4-5, some places level 6, gust level 7.The weather will turn cold, mountainous and midland areas will be very cold, high mountainous areas will be very cold.
Thanh Hoa to Hue Lowest temperature: North 14-17 degrees Celsius; South 18-22 degrees Celsius Highest temperature: North 19-22 degrees Celsius; South 22-25 degrees Celsius Cloudy.
In the North, there will be moderate rain, heavy rain, some places will have very heavy rain and thunderstorms; in the South, there will be heavy to very heavy rain, scattered thunderstorms.North to northwest wind level 3-4, coastal level 4-5.The weather will turn cold in the North.Warning of tornadoes, lightning, strong gusts of wind in thunderstorms.
South Central Coast Lowest temperature: 22-25 degrees Celsius Highest temperature: North 25-28 degrees Celsius; South 28-30 degrees Celsius Cloudy.
The North has heavy to very heavy rain; the South has moderate rain, heavy rain, scattered thunderstorms, some places have very heavy rain.Northeast wind level 2-3.Risk of tornadoes, lightning, strong gusts of wind when there is thunderstorms.
Central Highlands Lowest temperature: 18-21 degrees Celsius Highest temperature: 25-28 degrees Celsius, some places are much higher Than clouds, there is rain, moderate rain, scattered thunderstorms; some places have heavy to very heavy rain.
Northeast wind level 2-3.Warning of tornadoes, lightning, strong gusts of wind in thunderstorms.
Southern region Lowest temperature: 23-26 degrees Celsius, some places below 23 degrees Celsius Highest temperature: 29-32 degrees Celsius, some places above 32 degrees Celsius Cloudy, rain, moderate rain, scattered thunderstorms; each place has heavy to very heavy rain.
Northeast wind level 2-3.Risk of tornadoes, lightning, strong gusts of wind.
Ho Chi Minh City Lowest temperature: 24-26 degrees Celsius Highest temperature: 30-32 degrees Celsius Cloudy, rain, moderate rain and scattered thunderstorms, locally very heavy rain.
Light wind.Warning of tornadoes, lightning and strong gusts of wind when there is thunderstorms.