According to the latest forecast from the National Center for Hydro-Meteorological Forecasting, around noon on January 9, this strengthening cold air mass will affect the Northeast region, then affect the North Central region and some places in the Northwest and North Central regions.
From the night of January 10, cold air continues to strengthen and affect other places in the Northwest and Central Central regions, and some places in the South Central region. Northeast winds inland gradually strengthen to level 2-3, and coastal areas to level 3-4.
In the North, North and Central Central regions, the weather continues to be cold, the mountainous and midland areas of the North will be very cold, with some places experiencing severe cold; high mountainous areas may experience frost and frost. The lowest temperature during this cold spell in the North will generally be 9-12 degrees Celsius, in the mountainous areas of the North 6-9 degrees Celsius, in the high mountainous areas below 5 degrees Celsius in some places; in the North Central region, it will be 10-13 degrees Celsius; in the area from Quang Binh to Hue, it will be 14-17 degrees Celsius.
In Hanoi, the weather is cold, the lowest temperature in this cold air mass is commonly 9-12 degrees.
From noon and afternoon of January 9, the Northeast wind in the North East Sea gradually increased to level 7, gusting to level 8-9, rough seas, waves 3.0-5.0m high. From the night of January 9, the sea west of the South East Sea (including the sea west of Truong Sa archipelago) and the sea from Khanh Hoa to Binh Thuan gradually increased to level 7, gusting to level 8-9, rough seas, waves 2.0-4.5m high.
From the afternoon to the night of January 9, in the Gulf of Tonkin, the Northeast wind gradually increases to level 6, sometimes level 7, gusting to level 8-9, rough seas, waves from 1.5-3.5m high; in the sea from Quang Tri to Phu Yen and the Central East Sea, the Northeast wind gradually increases to level 6-7, gusting to level 7-8, rough seas, waves from 2.0-4.5m high.
Due to the influence of cold air strengthening from the afternoon of January 9, the area from Ha Tinh to Binh Dinh will have rain, showers and scattered thunderstorms, locally heavy rain. During thunderstorms, there is a possibility of 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.
Under the influence of cold air, people and tourists in the Northern and Central regions should bring warm clothes and thermal clothing when going out. Meanwhile, people from Ha Tinh to Binh Dinh should bring umbrellas and raincoats to guard against sudden thunderstorms.
