According to the National Center for Hydro-Meteorological Forecasting, last night and this morning (July 31), the Northern region had scattered showers and thunderstorms, with some places having heavy to very heavy rain. Rainfall from 7pm on July 30 to 8am on July 31 was over 100mm in some places such as: Chieng Cong station (Son La) 125.8mm; Ngoc Long station (Tuyen Quang) 100.2mm; Pu Sam Cap station (Lai Chau) 128.0mm; Huoi Leng 1 (Dien Bien) 155.2mm...
Warning of the risk of rain greater than 90mm in 3 hours
Mr. Nguyen Huu Thanh - Deputy Head of Weather Forecast Department, National Center for Hydro-Meteorological Forecasting said that the mountainous and midland areas of the North from the evening of July 31 to August 1 are forecast to have moderate rain, heavy rain and thunderstorms, locally very heavy rain.
"The common rainfall from this evening to tomorrow is about 20 - 60mm, locally over 120mm. The rain will be concentrated in the afternoon and night. We warn of the risk of heavy rain with more than 90mm of rainfall in 3 hours" - Mr. Thanh emphasized.
According to Mr. Thanh, it is forecasted that from the night of August 1, heavy rain in the mountainous and midland areas of the North will gradually decrease.
Meanwhile, other places in the North from the evening of July 31 to August 1 are forecast to have scattered showers and thunderstorms, locally heavy rain with rainfall of 10 - 30mm, locally over 70mm.
Central Highlands and Southeast region in the evening and evening of July 31, locally heavy rain with rainfall over 50mm.
During thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind. The National Center for Hydro-Meteorological Forecasting 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 and industrial areas; flash floods on small rivers and streams; landslides on steep slopes.
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.
Extreme rain tends to increase
According to Mr. Mai Van Khiem - Director of the National Center for Hydro-Meteorological Forecasting, Department of Hydro-Meteorology, this year, looking at the overall weather patterns, including heavy rain affected by ENSO in a neutral state. In most ENSO neutral years, the total rainfall is not too much, at the same level as the average of many years.
"However, the rainfall may be concentrated in some periods. Extreme rain in a short period of time in a narrow range is something we have especially warned of. Therefore, we do not only care about the total rainfall, because the abnormality is not only in the rainfall but also in the abnormality of rainfall and intensity" - Mr. Khiem analyzed.
According to Mr. Khiem, statistics from the meteorological agency show that over the past 20 years, the number of rains with rainfall of over 50mm within 1 hour in the North and some localities has tended to increase.
"The Northern and Southern regions are in the rainy season. The rainy season in the Central region is usually from September to November. However, although it is not the peak of the rainy season in the Central region, we warn that there may still be unusually heavy rain from now until the main rainy season begins" - Mr. Khiem advised.
