According to the National Center for Hydro-Meteorological Forecasting, the cold air mass reported in the north is still moving south.
The meteorological agency has forecast cold air developments in the next 24 to 48 hours.
During the day and night of September 30, due to the influence of cold air, the Northern region, Thanh Hoa and Nghe An will have moderate rain, heavy rain and scattered thunderstorms, locally very heavy rain with common rainfall of 20 - 70mm, locally over 150mm.
Thunderstorms may produce tornadoes, lightning, hail and strong winds.
Around the morning of October 1, this cold air mass will affect the Northeast region, then affect the North Central region, some places in the Northwest and North Central regions.
Northeast wind inland level 3, coastal area level 4 - 5.
Day and night of October 1, the Northern region has the lowest temperature of about 20 - 23 degrees Celsius, mountainous areas have places below 20 degrees Celsius.
During this cold spell, the weather in the North and North Central regions will be cool; cold at night and early morning. The mountainous regions of the North will be cold.
The lowest temperature in the North and Thanh Hoa is generally from 19 - 22 degrees Celsius, in mountainous areas 17 - 19 degrees Celsius, in high mountainous areas below 16 degrees Celsius. In Nghe An - Ha Tinh, the lowest temperature is generally from 20 - 23 degrees Celsius.
At sea, from noon on October 1, in the Gulf of Tonkin, the northeast wind will gradually increase to level 6, gusting to level 7-8; rough seas; waves 1.5-2.5m high.
Strong winds and large waves at sea are likely to affect boating and other activities.
