According to the National Center for Hydro-Meteorological Forecasting, last night and this morning (August 22nd), the Northeast region and Thanh Hoa had moderate rain, heavy rain and thunderstorms, with locally very heavy rain. The cause of the rain is due to the impact of storm No. 4 Narra operating in the sea area of Quang Ninh-Hai Phong.
Rainfall from 7:00 p.m. on August 21 to 8:00 a.m. on August 22 in some places is over 170mm such as Mau Son monitoring stations (Lang Son) 204.8mm, Phinh Ho (Quang Ninh) 193.6mm, Trang Vinh Lake (Quang Ninh) 173.2mm...
Heavy rain is likely to last after the night of August 24th
The Northeast region, the south of Phu Tho and Thanh Hoa provinces from August 22nd to the end of the night of August 23rd, is forecast to have moderate rain, heavy rain and thunderstorms with common rainfall from 70 - 150mm, locally very heavy rain over 300mm.
Especially in Quang Ninh and Hai Phong city, there will be very heavy rain with common rainfall from 200 - 300mm, locally over 500mm.
Lang Son and Bac Ninh areas have heavy to very heavy rain with common rainfall of 150 - 250mm, locally over 400mm.
On the day and night of August 24, the Northeast region, the south of Phu Tho and Thanh Hoa provinces will continue to have moderate rain, heavy rain and thunderstorms with common rainfall of 30 - 60mm, locally very heavy rain over 120mm.
Total rainfall from August 22 to the night of August 24 is commonly 100 - 200mm, locally over 400mm in some places; especially Quang Ninh, Hai Phong is commonly 250 - 350mm, locally over 600mm in some places; Lang Son, Bac Ninh is commonly 200-300mm, locally over 500mm in some places. It is forecast that the rain situation may continue to last after the night of August 24.
The Northwest region on August 22nd, day and night, will have scattered showers and thunderstorms with rainfall of 15 - 30mm, locally heavy rain over 60mm.
In thunderstorms, there is a possibility of tornadoes, lightning and strong gusts of wind. Warning level of natural disaster risk due to heavy rain, tornadoes, lightning, and hail is level 1, especially Quang Ninh and Hai Phong areas level 2.
Heavy rain is likely to cause flooding in low-lying areas, urban areas, and industrial parks; flash floods on small rivers and streams, and landslides on slopes.
Warning of floods downstream of the Thuong and Luc Nam rivers
Regarding the hydrological situation, the water level on the Thuong River and Luc Nam River (Bac Ninh) is rising. At 7:00 AM on August 22, 2026, the water level downstream of the Thuong River at Phu Lang Thuong station was 3.4m, below alarm level 1 by 0.9m; downstream of the Luc Nam River at Luc Nam station was 3.45m, below alarm level 1 by 0.85m.
From now (August 22) to August 24, floods on the upper Thuong and Luc Nam rivers will continue to occur, in the lower Thuong and Luc Nam rivers, a flood will appear with a flood amplitude of 1-2m.
During this flood, the peak flood in the upper reaches of the Thuong and Luc Nam rivers is likely to reach alarm level 2-alerte 3 and above alarm level 3, in the lower reaches alarm level 1-alerte 2.
High risk of flash floods and landslides in mountainous and midland areas; flooding in low-lying areas along the Thuong and Luc Nam river basins.
Warning level of natural disaster risk due to floods is level 1-2. Floods on rivers and streams can cause flooding in low-lying areas along rivers, affecting activities such as waterway traffic, aquaculture, agricultural production, people's livelihoods and socio-economic activities.
