According to the National Center for Hydro-Meteorological Forecasting, this afternoon May 21, the weather in the Northern and Southern regions will be rainy, moderate rain and scattered thunderstorms, with locally heavy to very heavy rain.
Rainfall calculated from 7:00 AM to 3:00 PM on May 21, locally over 70mm such as station: Son Dong (Bac Giang) 220. 8mm, Quang Ha (Quang Ninh) 210. 4mm, Cong Bang (Thai Nguyen) 84. 4mm, Hiep Thanh (Ca Mau) 96. 2mm, Soc Trang (Can Tho City) 78. 2mm...
Forecast for the evening and night of May 21, the Northern region will have scattered showers and thunderstorms with rainfall of 10-30mm, locally heavy rain over 60mm.
Hanoi area is cloudy, with rain, scattered showers and thunderstorms in some places. Southeast wind level 2-3. In thunderstorms, there is a possibility of tornadoes, lightning and strong gusts of wind.

In the late afternoon and evening of May 21, the Central Highlands and Southeast regions will have scattered showers and thunderstorms with rainfall of 10-20mm, locally heavy rain over 50mm.
In thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind.
Rainstorms accompanied by tornadoes, lightning, hail and strong gusts of wind can affect agricultural production, causing trees to fall, damage to houses, traffic works, and infrastructure. Localized heavy rains are likely to cause flash floods on small rivers and streams, landslides on slopes, and flooding in low-lying areas.
People and tourists going out should bring umbrellas and raincoats to prevent sudden weather changes. Avoid going out when it rains heavily and the wind is strong to ensure safety.