On the afternoon of October 7, Tuyen Quang, Thai Nguyen and Hanoi continued to have heavy rain, locally over 100 mm.

Assessing the flood situation in the coming days, at noon on October 7, Associate Professor, Doctor, Director of the National Center for Hydro-Meteorological Forecasting Mai Van Khiem said that the convergence of the meridional winds is currently showing signs of weakening, so in the afternoon of October 7, the North will still have moderate to heavy rain with rainfall in Tuyen Quang, Thai Nguyen and Hanoi areas of about 30-60 mm, locally over 100 mm. Other places will have rain from 20-30 mm. On the evening of October 7, the rain decreased but by the early morning of October 8, the Northeast region may have rain and moderate rain again. Warning of major floods on rivers in the North and Thanh Hoa.

The water level of the Hien River in Cao Bang rose very quickly, causing flooding in low-lying areas. Photo: Chu Hieu/VNA

Due to the impact of heavy rain from October 7 to October 10, floods on rivers in the Northern region and Thanh Hoa continued to rise. During this flood, the flood peak on rivers in Cao Bang, Lang Son, Quang Ninh provinces, Luc Nam River (Bac Ninh), Thai Binh River (Hai Phong) reached alert level 2-alarm 3 and above alert level 3; the flood peak on Thao River (Lao Cai), Lo River (Tuyen Quang), Hoang Long River (Ninh Binh), upstream Ma River (Thanh Hoa) reached alert level 1-alarm 2, some rivers above alert level 2; the flood peak reaching Hoa Binh Lake, downstream Red River at Hanoi station is likely above alert level 1.

"Warning of widespread flooding in the provinces of Thai Nguyen, Bac Ninh , Lang Son, Cao Bang and the risk of flooding in low-lying areas along rivers and urban areas in the Northern region and Thanh Hoa; risk of landslides on river banks and river dykes, risk of flash floods on rivers and streams and landslides on steep slopes in the mountainous areas of the Northern region and Thanh Hoa", Director Mai Van Khiem emphasized.

Explaining the cause of heavy rain, Mr. Mai Van Khiem said that due to the convergence of meridional winds of storm No. 11 and the humid Southeast wind zone of the subtropical high pressure, heavy rain occurred in the Northern region, focusing on the Northeast region, including the capital Hanoi.

However, analyzing the difference between the rain on September 30 and the rain on the morning of October 7, Mr. Khiem said that the rain on September 30 occurred from early morning and lasted until the afternoon; the rain on October 7 occurred mainly in the early morning and morning. The largest 1-hour rainfall of the rain on September 30 measured at Dinh Cong station (Hanoi) from 11-12 am on September 30 was 101.4 mm, while the largest 1-hour rainfall of the rain on October 7 at Me Tri from 5-6 am was 108.2 mm.

Along with that, the rain on September 30 caused more widespread flooding than the rain on October 7. The heaviest rain on September 30 was concentrated in the inner city and northern areas of Hanoi, with rainfall ranging from 200 - 300 mm/24 hours; the western and southwestern areas (Ba Vi, Xuan Mai, Chuong My, Son Tay) had rainfall ranging from 60 - 90 mm; the number of rain spots over 100 mm on September 30 was more than on October 7. The heaviest rain on October 7 was also concentrated in the inner city of Hanoi, including Me Tri, Lang, Cau Dien, Ha Dong, Phu Lam, Dong Anh. The areas of Ba Vi, Xuan Mai, Chuong My, Son Tay had light rain.

"The National Center for Hydrometeorology continues to update based on the latest observations. Regarding the rain situation in Hanoi, the hydrometeorological agency coordinates with the Hanoi People's Committee to continuously update flood and rain warnings, providing people with information to proactively respond," Mr. Mai Van Khiem noted.

Due to the influence of the circulation of storm No. 11, from October 6, there has been moderate to heavy rain in a wide area in the Northern region; from early morning and the morning of October 7, due to the influence of the circulation of the weakened low pressure area from storm No. 11 with the center of the low pressure area located in the western region of the Northern region, combined with the Southeast wind zone of the subtropical high pressure tongue strongly encroaching from the East, creating a convergence zone of meridional winds in the northeastern region, running along the provinces of Tuyen Quang, Cao Bang, Thai Nguyen, Phu Tho, Hanoi, Lang Son, Bac Ninh, in which Thai Nguyen and Hanoi are the two provinces with especially heavy rain. In Thai Nguyen, the rainfall from 7:00 p.m. on October 6 to 9:00 a.m. on October 7, some places were over 450 mm such as Hoa Thuong station (Thai Nguyen) 526 mm, Cay Thi station (Thai Nguyen) 462 mm, in other localities there were places over 200 mm such as Bo Ha station (Bac Ninh) 348 mm, Me Tri station (Hanoi) 261.6 mm, Soc Son station (Hanoi) 242.4 mm, Tan Tri 1 station (Lang Son) 224.4 mm, Chuc Bai Son station (Quang Ninh) 216 mm...

Source: https://baotintuc.vn/xa-hoi/chieu-710-tuyen-quang-thai-nguyen-va-ha-noi-tiep-tuc-co-mua-to-cuc-bo-tren-100-mm-20251007140245967.htm