According to the National Center for Hydro-Meteorological Forecasting, on September 23, in the Northwest region, from Quang Tri to Gia Lai, there will be scattered showers and thunderstorms, with some places having heavy rain.
Rainfall from 7am to 1pm on September 23 was measured by monitoring stations over 50mm such as: Nam Han station (Lai Chau) 57.2mm, Pha Khinh station (Son La) 56.8mm, Viet Trung station (Quang Tri) 55.4mm, Vinh Kim station (Quang Tri) 67mm.
In the evening and night of September 23, the Northwest and Tuyen Quang regions, from Thanh Hoa to Quang Ngai, will have scattered showers and thunderstorms, with rainfall of 15 - 30mm, locally heavy rain over 80mm.
The Central Highlands region will have scattered showers and thunderstorms, with rainfall of 20 - 40mm, locally heavy to very heavy rain over 100mm.
In the late afternoon and evening of September 23, the Southern region will have scattered showers and thunderstorms, with rainfall of 10-30mm, locally heavy rain over 60mm. Warning of the risk of heavy rain over 70mm within 3 hours. During thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind.
From the night of September 24, due to the impact of storm No. 9 Ragasa, many areas will have increased heavy rain.
From the night of September 24 to the end of September 25, the Northern region, Thanh Hoa and Nghe An will have heavy to very heavy rain, with common rainfall of 50 - 100mm, locally over 200mm. Warning of the risk of heavy rain over 100mm within 3 hours.
In particular, the Northeast and Thanh Hoa regions from the night of September 24 to the end of September 25, the common rainfall is 50 - 100mm, locally over 200mm.
The Northwest and Nghe An regions on September 25 will have rainfall of 30 - 70mm, some places over 150mm.
From the night of September 25 to the end of the night of September 26, the North, Thanh Hoa and Nghe An will continue to have heavy to very heavy rain, with common rainfall of 50 - 150mm, locally over 200mm.
Heavy rain in the North, Thanh Hoa, Nghe An is likely to last until the end of the night of September 26. The total rainfall from the night of September 24 to the end of the night of September 26 was generally 100 - 250mm, locally over 400mm.
The meteorological agency warns that the risk of natural disasters due to heavy rain, tornadoes, lightning, and hail is level 1.
Heavy rain is likely to cause flooding in low-lying areas, urban areas, industrial parks; flash floods on small rivers and streams; landslides on steep slopes.
Regarding the hydrological situation, currently, the water level on the main rivers in the Red - Thai Binh river system, Ma river (Thanh Hoa), Ca river (Nghe An) fluctuates slightly and is below alert level 1.
From the night of September 24 to September 27, on rivers in the northern region, Thanh Hoa and Nghe An, there is a possibility of a flood, with a flood amplitude of 4-7m in the upstream of rivers and 2-4m in the downstream of rivers.
During this flood, flood peaks on small rivers are likely to rise to alert level 2 - alert level 3; flood peaks on Thao River, Lo River, upstream of Thai Binh River, Hoang Long River, Buoi River, upstream of Ma River will rise to alert level 1 - alert level 2, some rivers above alert level 2; the upstream of Ca River will rise above alert level 1; the flood peaks in the downstream of Red River, Thai Binh River, Ma River, Ca River are below alert level 1.
There is a high risk of flooding in low-lying areas along rivers, urban areas in the Northern Delta, Thanh Hoa, Nghe An; flash floods and landslides on steep slopes in the mountainous areas of the North, Thanh Hoa, Nghe An.
Real-time warning information for areas at risk of flash floods and landslides is provided online on the website of the Department of Hydrometeorology at: https://luquetsatlo.nchmf.gov.vn and in a separate bulletin warning of flash floods and landslides.
The warning level of natural disaster risk due to floods is level 1. Floods on rivers cause flooding in low-lying areas along rivers, affecting activities such as waterway transportation, aquaculture, agricultural production, people's lives and socio-economic activities.
