In less than a week, Hanoi has suffered two consecutive heavy rains after the storm, causing many streets to turn into rivers, disrupting people's lives. A similar situation is also happening in many northern provinces such as Cao Bang, Thai Nguyen, Lang Son.
In that situation, Mr. Le Ngoc Quyen - Deputy Director of the Northern Hydrometeorological Station (Department of Hydrometeorology) - commented on the causes of the phenomenon of floods as well as forecast the developments in the coming days.
Sir, in recent days, many localities in the North have had heavy and heavy rain. Can you tell us the cause of the recent floods in Cao Bang, Thai Nguyen and Lang Son?
- Early in the morning of October 6, storm No. 11 after making landfall in the Phong Thanh area of Guangxi province (China) continued to move in the West Northwest direction and weakened into a low pressure area. By the night of October 6, this low pressure area was located in the mountainous areas of the Northern provinces.
From the night of October 6 to the afternoon of October 7, the strong Southeast wind zone from the ground up to over 5,000m combined with the Southwest wind zone from Bengan Bay will rise to form an easterly wind convergence zone in the mountainous and midland areas of Viet Bac, causing heavy to very heavy rain in the provinces of Cao Bang, Thai Nguyen, Lang Son.
Rainfall in 36 hours (from 7am on October 6 to 7pm on October 7) in Thai Nguyen is generally 200 - 400mm, some places are larger such as Dong Hy 596mm, Nam Hoa 554mm, Phan Dinh Phung 514mm,... In Cao Bang, the rainfall is generally 100 - 200mm, some places are larger such as: Xuan Truong 293mm, Nguyen Binh 273mm, Minh Tam 266mm,...
In Lang Son, the common rainfall of 100 - 200mm is greater in some places such as Yen Binh 334mm, Tan Tri 290mm, Thien Tan 279mm,... With heavy rainfall (Tous rainfall in 36 hours exceeding the total rainfall of TBNN in the whole month of October occurring in a short time combined with the terrain with a large slope from North to South, narrow riverbed and strongly winding, reducing drainage speed when heavy rain occurs.
As a result, when the water from above rapidly receded, the water from below could not drain in time, so the provinces of Cao Bang, Thai Nguyen, and Lang Son experienced serious flooding and major floods in recent days.
So in the following hours, how is the forecast for rainfall in the Northern region? Will there be more heavy rains, sir?
- According to our assessment, in the coming hours, the weather in the Northern provinces will continue to improve, with sunshine, showers and thunderstorms only occurring in a few places and there is no longer a possibility of widespread heavy rain.
Sincerely thank you!
