Before the arrival of rain, northern Vietnam remained under a heatwave. Observation data at 1 p.m. revealed temperatures exceeding 39 degrees Celsius in many locations. Hoa Binh and Bai Thuong (Thanh Hoa) both recorded 39,6 degrees Celsius, Phu Ly (Ninh Binh) reached 39,4 degrees Celsius, and Lang station (Ha Noi) hit 39,2 degrees Celsius. In the Bac Trung Bo region, Tinh Gia (Thanh Hoa) and Tay Hieu (Nghe An) surpassed 40 degrees Celsius.

According to the National Center for Hydro-Meteorological Forecasting, from late afternoon and tonight, mountainous and midland areas of Bac Bo are expected to experience heavy to very heavy rain, with common rainfall amounts of 20-40 mm and some areas receiving over 130 mm. The Bac Bo Delta, including Ha Noi, will see scattered showers and thunderstorms, with rainfall amounts of 10-30 mm, and locally over 70 mm.

These thunderstorms are forming due to a low-pressure trough combined with an intensifying upper-level convergence. From 26/6, the heatwave in Bac Bo will end, with highest temperatures commonly ranging from 31-34 degrees Celsius.

Ha Noi streets are congested during thunderstorms. Photo: Pham Chieu

According to AccuWeather, Ha Noi's temperature on 26/6 is forecast to drop by about 7 degrees Celsius compared to today, reaching 26-32 degrees Celsius. In Sa Pa (Lao Cai), temperatures will decrease to 19-21 degrees Celsius.

Meanwhile, the area stretching from Thanh Hoa to Da Nang and the eastern parts of Quang Ngai to Dak Lak provinces will continue to experience heatwave conditions. On 26-27/6, highest temperatures are commonly expected to be 36-38 degrees Celsius. Specifically, the area from Nghe An to Da Nang and eastern Quang Ngai will reach 37-39 degrees Celsius, with some places exceeding 39 degrees Celsius. The heatwave in Trung Bo is forecast to persist for many more days.

Meteorological agencies warn that thunderstorms in Bac Bo, Tay Nguyen, and Nam Bo may be accompanied by whirlwinds, lightning, hail, and strong gusts. Local heavy rain also increases the risk of flooding in low-lying, urban areas, while simultaneously causing flash floods and landslides in hilly and mountainous regions.

Forecast temperatures are measured under standard conditions. In reality, outdoors, especially in areas with extensive concrete, asphalt, and sparse greenery, the perceived temperature can be 2-4 degrees Celsius higher.

Gia Chinh