Prolonged Heavy Rainfall Expected in Northern Vietnam
Northern Vietnam is anticipated to face a significant period of heavy rainfall, lasting at least four days starting from Thursday. This weather pattern will initially affect the midland and mountainous regions before gradually spreading to the lowlands. The National Center for Hydro-Meteorological Forecasting has issued warnings about the potential impacts of this extended rainfall.
Intense Rainfall Patterns
A combination of a low-pressure trough and an active cyclonic system is responsible for the widespread rainfall across the northern midland and mountainous areas. Rainfall amounts are expected to range between 30–70 mm in these regions. Some locations may experience even higher levels, with more than 150 mm recorded. In certain areas, rainfall could exceed 100 mm within just three hours, posing a risk of flash flooding.
Starting on Thursday, the rain will spread throughout the entire northern region. Total rainfall is projected to reach between 70–150 mm. In some parts, 24-hour rainfall might surpass 300 mm, and heavy downpours exceeding 150 mm in three hours are also possible. This prolonged rainfall is expected to bring an end to the current heat wave that has affected the region.
Temperature Changes
On Tuesday, Hanoi experienced a high of 38 degrees Celsius. According to forecasts from the American weather service AccuWeather, temperatures are expected to drop to 35°C on Wednesday and continue decreasing to between 26–31°C by Saturday. This temperature shift highlights the dramatic change in weather conditions due to the ongoing rainfall.
Potential Hazards
The meteorological agency has warned that the heavy rain could lead to several hazards. Flooding is likely in low-lying, urban, and industrial areas. Flash floods may occur in small rivers and streams, while landslides are a concern in mountainous and sloped terrain. These risks underscore the need for preparedness and caution among residents in affected regions.
Unusually Wet Summer
Northern Vietnam is currently experiencing an unusually wet summer. In June alone, there were 20 days of rainfall, which is eight days more than in 2024 and seven days more than in 2023. Several locations have already recorded historic rainfall levels for June. For instance:
- Son La Province recorded 379 mm, exceeding its 1995 record by 11 mm.
- Thai Nguyen saw 994 mm, surpassing the 1979 record by about 6 mm.
- Lang Son recorded 442 mm, over 100 mm more than the 1978 record.
- Bac Giang reached 562 mm, exceeding the 1986 record by more than 50 mm.
Impact on Communities
The persistent rain has already caused flooding in Thai Nguyen, Bac Ninh, and Son La provinces. Additionally, landslides have occurred on major provincial and national highways, disrupting transportation and posing further challenges for local communities. Authorities are closely monitoring the situation and advising residents to remain vigilant and take necessary precautions.
