According to the National Center for Hydro-Meteorological Forecasting, the weather forecast from the night of May 20 to May 21 is scattered thunderstorms in many places across the country.
Weather forecast for the North: showers and thunderstorms at night in some places, especially in the plains on the night of May 20 with scattered showers and thunderstorms, locally heavy rain; sunny day, some places have hot sunshine.
Weather forecast for the Central region: showers and thunderstorms in some places in the evening and at night, especially in the South Central region from the afternoon and evening of May 21, there will be scattered showers and thunderstorms; sunny days, some places have hot weather, especially in the area from Thanh Hoa to Phu Yen, there will be hot weather, some places have severe heat.
Weather forecast for the Central Highlands and the South has scattered showers and thunderstorms, scattered showers and thunderstorms in the afternoon and evening, locally heavy rain, from the evening of May 21 there will be rain, moderate rain and scattered thunderstorms, locally heavy rain.
People and tourists need to be on guard during thunderstorms with the possibility of tornadoes, lightning, hail and strong gusts of wind.
In the afternoon bulletin of May 20, the meteorological agency warned that at night and night of the same day, there was a risk of flash floods, landslides, and subsidence on steep slopes and small streams at:
Quang Nam: Bac Tra My, Dai Loc, Dong Giang, Hiep Duc, Nam Giang, Nam Tra My, Nong Son, Nui Thanh, Phu Ninh, Phuoc Son, Que Son, Tay Giang
Lam Dong: Bao Lam, Cat Tien, Da Huoai, Da Teh, Di Linh, Duc Trong, Lam Ha, Bao Loc City
Dak Lak: Cu M'gar, Ea H'leo, Krong A Na, Krong Buk, Lak, Buon Ma Thuot City
Dak Nong: Cu cut, Dak Glong, Dak Mil, Dak R'lap, Dak Song, Krong No, Gia Nghia City, Tuy Duc
People and tourists are advised to closely monitor weather reports and warnings from authorities.
Limit travel through mountainous areas and along rivers and streams at night. Proactively plan to prevent and evacuate in time if there is prolonged heavy rain.
Tourists should avoid camping, picnicking or trekking in mountainous areas and stream waterfalls during this time.

Weather forecast for tomorrow in Hanoi
Lowest temperature: 26-28°C Highest temperature: 33-35°C, some places above 35°C
Cloudy, showers and thunderstorms in some places in the evening and at night; sunny during the day, some places are hot. Light wind.
Weather forecast for tomorrow in the Northwest region
Lowest temperature: 23-26°C, some places below 23°C Highest temperature: 32-35°C, some places above 36°C
Cloudy, showers and thunderstorms in some places in the evening and at night; sunny during the day, some places are hot. Light wind.
Weather forecast for tomorrow in the Northeast region
Lowest temperature: 24-27°C, mountainous areas below 23°C Highest temperature: 32-35°C, some places above 35°C
Weather: Cloudy, showers and thunderstorms in some places in the evening and at night; scattered showers and thunderstorms in the plains tonight, locally heavy rain; sunny day, hot sunshine. Light wind.
During thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind.
Weather forecast for tomorrow in the area from Thanh Hoa to Hue
Lowest temperature: 25-28°C Highest temperature: 34-37°C, some places above 37°C
Cloudy, showers and thunderstorms in some places in the evening and at night; hot sunny during the day, some places are very hot.Light wind.
During thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind.
Weather forecast for tomorrow in the area from Da Nang to Binh Thuan
Lowest temperature: 25-28°C Highest temperature: 33-36°C, some places in the North above 37°C
Cloudy.In the North, there will be showers and thunderstorms in some places in the evening and at night; hot sunny days, some places will be very hot.
In the South, there will be showers and thunderstorms at night in some places; sunny days, some places will be hot; tomorrow evening, there will be scattered showers and thunderstorms.Light wind.
During thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind.
Weather forecast for tomorrow in the Central Highlands
Lowest temperature: 21-24°C Highest temperature: 29-32°C
Cloudy. At night, there will be scattered showers and thunderstorms, locally heavy rain; at night, there will be scattered showers and thunderstorms; sunny during the day. Tomorrow evening, there will be rain, moderate rain and scattered thunderstorms, with some places having heavy rain. Light wind.
During thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind.
Weather forecast for tomorrow in the Southern region
Lowest temperature: 24-27°C Highest temperature: 31-34°C, some places above 34°C
Cloudy.At night, there will be scattered showers and thunderstorms, locally heavy rain; at night, there will be scattered showers and thunderstorms; sunny during the day.
Tomorrow evening, there will be rain, moderate rain and scattered thunderstorms, with some places having heavy rain.Light wind.
During thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind.