According to Do Tien Vinh, a forecaster at the National Center for Hydro-Meteorological Forecasting, widespread showers and thunderstorms have affected many northern provinces in recent days.

The heaviest rainfall has been concentrated in the northern mountainous and midland regions, as well as Quang Ninh Province.

Between 7 a.m. and 3 p.m. on July 10, several monitoring stations recorded more than 60mm of rainfall, including Pac Ta in Lai Chau Province with 84.8mm and Doan Tinh in Quang Ninh with 63.8mm.

Heavy rain triggers flood warnings in Hanoi

Moderate to heavy rain has already developed across several wards and communes in southern Hanoi.

Forecasters expect the rain to spread across central districts over the next one to three hours, with rainfall totals of 20-40mm and locally higher amounts.

Authorities warn that the downpours could cause localized flooding on numerous streets, with water depths typically reaching 10-30cm and potentially deeper in some locations.

Flooding may last for approximately 20 to 30 minutes after periods of intense rainfall.

Meteorologists say the current spell of wet weather will continue from the night of July 10 through the end of July 11.

Across northern Vietnam and Thanh Hoa Province, moderate to heavy rain and scattered thunderstorms are forecast, with widespread rainfall of 20-40mm.

In Dien Bien, Lai Chau and northern Son La, isolated locations could receive more than 100mm of rain.

Rainfall is expected to be heaviest during the late afternoon, evening and early morning hours.

Daytime conditions will remain warm, with occasional sunshine and temperatures generally ranging between 32°C and 34°C.

Forecasters expect the rain to gradually weaken from the night of July 11, with both its intensity and geographical coverage decreasing.

Risks remain elevated

The meteorological agency warns that intense thunderstorms may be accompanied by lightning, hail and strong wind gusts.

Prolonged heavy rain will also increase the risk of flash floods and landslides in mountainous areas, while low-lying urban districts remain vulnerable to localized flooding.

Bao Anh