According to the National Center for Hydro-Meteorological Forecasting, currently, a cold air mass is moving south from the north. The Gulf of Tonkin is experiencing northeast winds of level 3-4.
The meteorological agency has forecast cold air developments in the next 24 to 48 hours.
Around the afternoon of October 22, this cold air mass will affect the mountainous areas of the Northeast, then affect other places in the Northeast, North Central, some places in the Northwest and North Central. The wind inland will strengthen to level 3, coastal areas to level 4 - 5.
In the afternoon and night of October 22, the North and Thanh Hoa will have scattered showers and thunderstorms.
On the night of October 22 and October 23, the North will have the lowest temperature of 21 - 24 degrees Celsius, in mountainous areas below 20 degrees Celsius. The average daily temperature is about 24 - 26 degrees Celsius, in mountainous areas below 24 degrees Celsius. In the North, Thanh Hoa and Nghe An, the weather will turn cool.
From the night of October 22 to October 23, the area from Nghe An to Binh Dinh will have rain, moderate rain, locally heavy rain and thunderstorms.
From the night of October 23, the night and morning will be cold, especially in the mountainous areas of the North. The lowest temperature in the North is generally from 19 - 21 degrees Celsius, in the mountainous areas 17 - 19 degrees Celsius, in the high mountainous areas below 16 degrees Celsius. In Thanh Hoa - Nghe An, the lowest temperature is generally from 20 - 23 degrees Celsius.
The meteorological agency warns that thunderstorms may cause tornadoes, lightning, hail, and strong gusts of wind. Thunderstorms accompanied by tornadoes, lightning, and strong gusts of wind can affect agricultural production, cause trees to fall, and damage houses, traffic works, and infrastructure.
Localized heavy rains can cause flooding in low-lying areas; flash floods in small rivers and streams, and landslides on steep slopes.
At sea, from the night of October 22, the northeast wind in the Gulf of Tonkin gradually increased to level 6, sometimes level 7, gusting to level 8 - 9; rough seas; waves from 1.5 - 2.5m high. In the North East Sea, the northeast wind was strong at level 6, sometimes level 7, gusting to level 8 - 9; rough seas; waves from 2.5 - 4.5m high.
Strong winds and large waves at sea are likely to affect boating and other activities.
