Heavy Rainfall Persists in Northern India and Bangladesh

Over the past week, parts of India, Bangladesh, Nepal, Thailand, western Laos, and Vietnam experienced heavy to very heavy rainfall, with localized areas witnessing extreme downpours. The cumulative rainfall in these regions generally reached 80-130 mm, with some areas recording 150-300 mm and localized totals exceeding 400 mm (Figure 1).

From August 2 to 5, under the combined influence of a low vortex and the southwest monsoon (Figure 2), heavy to torrential rain is expected in northern India, Nepal, Bhutan, northern Bangladesh, northern Myanmar, northern Thailand, and northern Laos. Isolated areas may experience extremely heavy downpours, accompanied by severe convective weather such as short-duration intense rainfall and thunderstorms with strong winds. The cumulative precipitation in most of these regions is anticipated to be between 60 and 110 mm, with some areas receiving 150 to 220 mm, and locally exceeding 250 mm (Figure 3).

Attention should be given to the potential secondary disasters triggered by heavy rainfall in the aforementioned regions, including flooding, landslides, debris flows, and urban waterlogging.

Figure 1 Accumulated Precipitation from July 26 to August 1, 2025 (Unit: mm)

Figure 2 500 hPa Geopotential Height (Contour Lines) and 850 hPa Wind Field (Wind Barbs) at 00:00 UTC, August 3, 2025

Figure 3 Forecasted Accumulated Precipitation from August 2 to 5, 2025 (Unit: mm)

Author: Wang Zeyi                                                              Reviewer: Niu Ruoyun 

English reviewer:Wang Yi                                                                       Issue approver:Dai Kan