Deep convective cloud formation over northern Bangladesh has triggered widespread rainfall, with authorities warning of heavy downpours, strong winds and a potential flood situation in parts of the northeast.

The Bangladesh Meteorological Department recorded the highest rainfall of 158mm in Moulvibazar’s Sreemangal in 24 hours until this morning.

Meteorologist Md Shahinul Islam told The Daily Star that some areas in Mymensingh division and Sylhet division may experience rainfall of 44–88mm within 24 hours, while isolated places could see very heavy rainfall exceeding 88mm by tomorrow.

He said a significant pressure gradient persists over the north Bay of Bengal and adjoining areas, prompting the weather office to advise maritime caution.

As a result, seaports in Chattogram, Cox’s Bazar, Mongla Port and Payra Port have been asked to hoist local cautionary signal No. 3.

Fishing boats and trawlers have been advised to remain close to the coast and operate with caution until further notice.

The forecast also indicates that regions including Dhaka, Mymensingh, Cumilla, Noakhali, Chattogram, Cox’s Bazar and Sylhet may experience squally weather, with wind speeds reaching 60–80 kmph from the west or north-west.

River ports in these areas have been advised to display signal No. 2.

Meteorologist Md Tariful Newaz Kabir said rainfall would be comparatively lower in Rajshahi division and Rangpur division today, though most other regions are likely to see rain or thundershowers.

“Rainfall activity will be more pronounced in Dhaka, Mymensingh, Chattogram and Sylhet divisions,” he said, adding that the current trend may persist until the first week of next month before easing from May 2.

The Flood Forecasting and Warning Centre of the Bangladesh Water Development Board has warned that rising water levels in the Surma, Kushiyara, Manu, Khoai and Juri rivers may cross pre-monsoon danger levels in parts of Sylhet, Sunamganj, Moulvibazar and Habiganj.

This could trigger flooding in low-lying areas adjacent to rivers in Sylhet, Moulvibazar and Habiganj.

Partha Pratim Barua, a duty officer at the centre, said water levels had not crossed danger marks as of this morning but may do so by tomorrow if rainfall continues.