A significant shift in weather patterns is set to sweep across Bangladesh as a partially active rain spell moves into the region. According to forecasts issued by the private meteorological monitoring organisation, the Bangladesh Weather Observation Team (BWOT), heavy to extremely heavy rainfall is anticipated across various parts of the country from 3 August through 8 August. Overall, approximately 50 to 60 per cent of Bangladesh is expected to experience varying degrees of notable precipitation during this six-day period.
Given the partial nature of this weather system, precipitation will not be uniformly distributed. Instead, intense localized downpours are projected to concentrate in specific regions. The atmospheric disturbance is anticipated to be at its most active across the northern and north-eastern divisions of Rangpur, Rajshahi, Mymensingh, and Sylhet. Meanwhile, moderate activity is forecast for the southern and central divisions of Khulna, Dhaka, Barishal, and Chattogram.
The progression of the rain spell will begin over Rangpur, Mymensingh, and Sylhet, before intensifying over Rajshahi on 4 August. By 5 and 6 August, the system is expected to spread broadly across the majority of the nation, marking the period of highest rainfall intensity nationwide. Overcast skies will dominate most regions on these peak days, limiting sunshine significantly, though intermittent spells of sunlight may still be observed in the coastal southern reaches of Khulna, Barishal, and Chattogram.
This sustained heavy precipitation poses a critical threat to the country’s hydrological systems. River levels across the northern and north-eastern regions are expected to rise rapidly, elevating the risk of temporary flash flooding in low-lying and flood-prone areas within the Rangpur, Rajshahi, Mymensingh, and Sylhet divisions. Regional flood forecasting centres and local administrative authorities in these vulnerable zones often remain on high alert during such summer monsoonal surges to mitigate potential loss of crops and infrastructural disruption.
Divisional rainfall estimates provided by BWOT indicate that the Rangpur division will bear the brunt of the downpours, with expected accumulations ranging between 220 mm and 250 mm. The divisional breakdown of expected cumulative precipitation over this period includes:
Rangpur: 220 mm to 250 mm
Sylhet: 200 mm to 250 mm
Mymensingh: 200 mm to 250 mm
Rajshahi: 170 mm to 220 mm
Khulna: 140 mm to 150 mm
Dhaka: 100 mm to 120 mm
Chattogram: 80 mm to 120 mm
Barishal: 80 mm to 120 mm
These statistics represent divisional averages expected to fall over a condensed three- to four-day duration, meaning district-level totals may fluctuate slightly depending on localized storm developments.
Regarding maritime conditions, meteorologists note that while the likelihood of a major oceanic system or tropical depression forming in the Bay of Bengal remains low, deep convective clouds could generate sudden squally winds. Maritime ports and coastal vessels have been advised to exercise heightened caution during navigation. Experts also noted that natural atmospheric fluctuations could lead to minor adjustments in the timing and overall intensity of the rain spell as it unfolds.
