According to the National Center for Hydro-Meteorological Forecasting, currently, the cold air mass is still moving southward. In the North, there are showers and thunderstorms in some places; the temperature at 7 am on September 9 is commonly 26 - 29 degrees Celsius.
Near dawn and morning of September 10, this cold air mass will affect the northeastern mountainous area of the Northern region, then affect other places in the Northeast region, North Central region and some places in the Northwest region. On land, winds will turn Northeast at level 2-3, coastal areas at level 3.
The Northeast and North Central regions will turn cool from September 10th.
On the night of September 9 and the day of September 10, the Northeast and North Central regions will have the lowest temperature of about 23 - 26 degrees C, the Northern mountainous region will have places below 21 degrees C. The average temperature is about 25 - 27 degrees C, the mountainous region will have places below 23 degrees C.
The lowest temperature in this cold air wave in the Northern and North Central regions is commonly from 21 - 24 degrees C, in the high mountainous areas of the Northern region, there are places below 19 degrees C.
Hanoi area from the night of September 9 to September 10 will have rain, showers and scattered thunderstorms, locally heavy rain; from September 10, the weather will turn cool.
Regarding the development of rain due to cold air, from the evening of September 9 to September 10, the Northern region will have rain, showers and scattered thunderstorms, with locally heavy rain.
On September 10th, Thanh Hoa to Hue city will have moderate rain, heavy rain and scattered thunderstorms, with locally very heavy rain.
In thunderstorms, there is a high possibility of tornadoes, lightning, hail and strong gusts of wind. Thunderstorms accompanied by tornadoes, lightning, hail and strong gusts of wind affect agricultural production, causing trees to fall, damage to houses, traffic works, and infrastructure.
Heavy rain and localized heavy rain are likely to cause flash floods on small rivers and streams, landslides on slopes and flooding in low-lying areas.
At sea, from September 10, in the Gulf of Tonkin, the wind will shift to Northeast, strong at level 4 - 5.
From the night of September 10, in the Gulf of Tonkin and the northern sea area of the Northern East Sea, there will be strong northeast winds at level 6, gusts at level 7 - 8; sea waves 1.5 - 2.5m high, especially the northern sea area of the Northern East Sea from 2 - 3m, rough seas.
Strong winds and gusts, large waves at sea are likely to affect the operation of ships and other activities.
