The National Center for Hydro-Meteorological Forecasting has forecast cold air developments in the next 24 to 48 hours.
Around the evening and night of November 25, this cold air mass will affect the northeastern provinces, then affect the North Central, Northwest and Central Central regions. Northeast winds inland will be strong at level 3-4, coastal areas at level 4-5.
The Northeast region and Hanoi will have scattered rain from the night of November 25 to the morning of November 26. The North Central and North Central regions will have moderate to heavy rain, and locally very heavy rain.
Thunderstorms may cause tornadoes, lightning and strong gusts of wind.
Thunderstorms accompanied by tornadoes, lightning and strong gusts of wind can affect agricultural production, cause trees to fall, 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.
The Northern and North Central regions have the lowest temperature of about 17 - 20 degrees Celsius, in mountainous areas it is below 17 degrees Celsius. The average temperature is about 21 - 23 degrees Celsius.
On November 26, the weather in the North and North Central regions will turn cold, and the mountainous areas will be freezing. The average daily temperature will be around 20 - 22 degrees Celsius, and the mountainous areas will be around 18 - 20 degrees Celsius.
From the night of November 26, the weather in the North and North Central regions will turn cold. The lowest temperature in this cold air mass in the North and North Central regions is generally from 16 - 18 degrees Celsius, in mountainous areas 12 - 14 degrees Celsius, and in high mountainous areas below 10 degrees Celsius.
Hanoi is getting cold. The lowest temperature in this cold air mass is commonly 17 - 19 degrees Celsius.
At sea, from the evening and night of November 25, the Gulf of Tonkin will have strong northeast winds of level 6 - 7, gusting to level 8 - 9, rough seas; waves 2 - 3.5m high. From November 26, the North East Sea area (including the Hoang Sa archipelago) will have strong northeast winds of level 6 - 7, gusting to level 8 - 9, rough seas, waves 3 - 5m high; the sea area from Quang Tri to Quang Ngai will have strong northeast winds of level 6, gusting to level 7 - 8, rough seas, waves 2 - 4m high.
Strong winds and large waves at sea are likely to affect boating and other activities.
