Severe Depression over Bay of Bengal to Bring Sustained Nationwide Rainfall

A deep depression over the North-west Bay of Bengal and surrounding regions is set to deliver five consecutive days of rain across Bangladesh, meteorologists have warned. The Bangladesh Meteorological Department (BMD) confirmed that light to moderate downpours, interspersed with localized heavy to very heavy rainfall, will affect every division in the country over the next 120 hours.

Meteorologist Khowondokar Hafizur Rahman detailed the impending weather patterns in an official forecast issued on Monday (27 July), noting that the active monsoon system will lead to initial temperature drops before conditions stabilize towards the end of the week.

Five-Day Divisional Outlook

The BMD’s daily projections highlight how the rainband will shift and intensify across Bangladesh:

• Period 1 (27–28 July): Most areas within the Rajshahi, Dhaka, Khulna, Barishal, and Chattogram divisions, together with parts of Rangpur, Mymensingh, and Sylhet, will see light to moderate rain or thundershowers accompanied by squally winds. Isolated heavy falls are anticipated nationwide, alongside a marginal decline in overall temperatures.

• Period 2 (28–29 July): Precipitation will concentrate heavily over Khulna, Barishal, Chattogram, and Sylhet divisions, while Rangpur, Rajshahi, Dhaka, and Mymensingh will experience sporadic rainfall. Both day and night temperatures are expected to decrease slightly further.

• Period 3 (29–30 July): Widespread rainfall is predicted across all eight administrative divisions (Rajshahi, Rangpur, Dhaka, Mymensingh, Khulna, Barishal, Chattogram, and Sylhet). Temperatures will remain steady throughout this 24-hour window.

• Period 4 (30–31 July): Rainy conditions will persist in many areas nationwide, with heavy downpours occurring in isolated spots. Day and night temperatures are set to experience a slight upward revision.

• Period 5 (31 July–1 August): Rain will cover most regions in Rangpur, Mymensingh, Chattogram, and Sylhet, while maintaining a strong presence across many areas in Rajshahi, Dhaka, Khulna, and Barishal. Temperatures are expected to remain unchanged.

Synoptic Overview and Hazards

Monsoonal deep depressions in the Bay of Bengal frequently generate unsettled weather patterns that impact agricultural activity, infrastructure, and maritime shipping. During such meteorological events, local maritime ports typically issue cautionary warnings to regulate coastal navigation and protect fishing operations.

Extended periods of heavy precipitation present distinct risks for low-lying coastal districts and urban centers. Densely populated metropolitan centers such as Dhaka often face localized flooding and traffic disruptions, while eastern hilly regions face elevated risks of landslips. Local authorities continue to monitor the depression’s movement to mitigate potential impacts on public safety and economic transport.