Heavy Rainfall Persists in India, Bangladesh

and Surrounding Regions

Over the past week, torrential rain to downpours has affected parts of India, Bangladesh, Thailand, southern Myanmar, western Laos, northern Vietnam, and the Philippines, with extremely heavy rain occurring locally. Accumulated rainfall reached 80-120 mm widely across these regions, 140-200 mm in some areas, and over 350 mm at specific locations(Figure 1).

It is forecasted that from July 27 to 30, influenced by the southwest monsoon (Figure 2), heavy to torrential rain will occur in western and northern India, Nepal, Bangladesh, Myanmar, northern Thailand, central Laos, central Vietnam, and northwestern Philippines, with localized extremely heavy downpours. These rains will be accompanied by severe convective weather such as short-duration intense rainfall and thunderstorms with strong winds. The cumulative precipitation in most of these areas is expected to range from 60-100 mm, with some regions receiving 120-180 mm. Localized areas in southern Rajasthan and southeastern West Bengal in India, southeastern Shan State and southeastern Bago Region in Myanmar could see accumulations exceeding 250 mm(Figure 3).

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

Figure 1: Accumulated Precipitation from July 21 to 27, 2025 (unit: mm)

Figure 2: 500 hPa Geopotential Height (contour lines) and 850 hPa Wind Field (wind barbs) at 00:00 UTC on July 28, 2025

Figure 3: Forecasted Accumulated Precipitation from July 27 to 30, 2025 (unit: mm)

Author: Yang Jing                               Reviewer: Bao Yuanyuan 

English reviewer:Wang Yi                                                                       Issue approver:Dai Kan