According to the National Center for Hydro-Meteorological Forecasting, currently, a cold air mass is moving south from the north.
Around the afternoon and night of November 17, this cold air mass will affect the Northeast; then affect the North Central region, some places in the Northwest and the Central Central region. The northeast wind inland will strengthen to level 3, coastal areas level 4.
From November 18, the Northeast and Thanh Hoa will have cold nights and early mornings. The Northeast and Thanh Hoa will have the lowest temperature of about 20 - 22 degrees Celsius, in mountainous areas it will be below 17 degrees Celsius. The average temperature is about 24 - 26 degrees Celsius.
Due to the influence of disturbances in the upper easterly wind zone combined with cold air, the North Central and South Central regions will have scattered showers and thunderstorms, with some places having heavy rain. Thunderstorms may cause tornadoes, lightning and strong gusts of wind.
Localized heavy rains can cause flooding in low-lying areas; flash floods in small rivers and streams, and landslides on steep slopes.
From November 20, the Northern and North Central regions will have cold nights and mornings. The lowest temperature during this cold spell in the Northern and North Central regions will generally be between 18 and 20 degrees Celsius, and in mountainous areas, below 15 degrees Celsius.
At sea, from November 18, the Gulf of Tonkin will have northeast winds gradually increasing to level 6, gusting to level 7-8; rough seas; waves 2-4m high. In the North East Sea, the northeast winds will be strong at level 6-7, gusting to level 8-9; rough seas; waves 3-5m high.
Strong winds and large waves at sea are likely to affect boating and other activities.
