Starting from August 14, Hanoi will experience moderate to heavy rainfall. Rivers in the city may see floods with water levels rising by 1-3 meters.
The Northern Hydrometeorological Station forecasts that due to the influence of the southern edge of a low-pressure trough, Hanoi will have scattered showers and thunderstorms on the night of August 11 and the afternoon of August 12. The weather will be mild, with temperatures ranging between 26-29°C. On the afternoon of August 12, the city will experience hot weather, with peak temperatures reaching 34-36°C, and up to 35-37°C in the central area.
This weather pattern in Hanoi is expected to persist until August 13. From August 14 to 17, the low-pressure trough may re-establish over Northern Vietnam, combined with high-altitude wind convergence. During this period, the city will be mostly cloudy with showers and thunderstorms, including days of moderate to heavy rain accompanied by whirlwinds, lightning, and strong gusts. Rivers in Hanoi may experience floods with water levels rising by 1-3 meters. The peak flood levels on the Da, Hong, Duong, and Day Rivers are expected to remain below Alarm Level I. Downstream water levels on these rivers will fluctuate due to hydropower reservoir operations, tides, and may rise by the end of the week.
In the northern mountainous region, scattered showers and thunderstorms will continue on the afternoon and night of August 11, with some areas receiving heavy rainfall of 10-30mm and localized amounts up to 80mm.
Due to heavy rainfall, water inflow to the Son La hydropower reservoir has increased significantly. As of 9:00 AM on August 11, the upstream water level reached 201.31 meters. Following the Red River Basin reservoir operation procedures, the Minister of Agriculture and Rural Development ordered the Director of Son La Hydropower Company to open one bottom floodgate at 4:00 PM the same day.
To ensure the safety of infrastructure and riverside activities, the Ministry of Agriculture and Rural Development has requested the provinces of Son La and Phu Tho to promptly notify local authorities, residents, and organizations operating along the rivers. This includes aquaculture facilities, water transport vehicles, ferry crossings, and construction sites. Authorities are urged to review safety measures for ongoing projects, sand and gravel mining operations, and other activities to prepare for the Son La reservoir discharge and protect lives and property.
