According to the National Center for Hydro-Meteorological Forecasting, cold air has affected some places in the northern mountainous areas and the Northeast region.
Around the afternoon and night of May 10, the cold air will strengthen, affecting other places in the Northeast, North Central and most places in the Northwest, then affecting some places in the Central Central.
On land, the wind will shift to northeast level 2 - 3; coastal areas will have northeast wind level 3 - 4, gusting to level 6.
On the day and night of May 10, the North and North Central regions will have the lowest temperature of about 20 - 23 degrees Celsius, in high mountainous areas it will be below 18 degrees Celsius; the average temperature will be about 25 - 27 degrees Celsius.
The Northern and North Central regions from the night of May 10 are forecast to turn cool, some mountainous areas of the North will be cold.
The weather in Hanoi will turn cool from the night of May 10. The lowest temperature in this cold air mass is generally 21 - 23 degrees Celsius.
On the day and night of May 11, the lowest temperature in the Northern and North Central regions will be around 20 - 23 degrees Celsius, in high mountainous areas, some places will be below 18 degrees Celsius; the average temperature will be around 23 - 25 degrees Celsius.
Regarding another notable situation, due to the influence of cold air compressing the low pressure trough, on the day and night of May 10, the mountainous areas of the North will have rain, moderate rain, some places with heavy rain and thunderstorms.
From the afternoon and night of May 10, the midlands and deltas of the North will have moderate rain, heavy rain, locally very heavy rain and thunderstorms.
From the afternoon of May 10 to the morning of May 11, the area from Thanh Hoa to Quang Binh will have moderate rain, heavy rain, locally very heavy rain and thunderstorms. The Central Central region will have scattered showers and thunderstorms, with some places having heavy rain.
The meteorological agency warns that thunderstorms accompanied by tornadoes, lightning, hail and strong gusts of wind can affect agricultural production, break trees, damage houses, traffic works and infrastructure.
Heavy rain is likely to cause flooding in low-lying areas; flash floods on small rivers and streams, landslides on steep slopes.
Heavy rain in a short period of time caused flooding in urban areas and industrial parks.
