Low-lying areas of coastal districts and their offshore islands and chars are likely to be inundated by tidal surges, the weather department said Sunday.

These districts are Satkhira, Khulna, Bagerhat, Jahalakathi, Pirojpur, Barguna, Patuakhali, Bhola, Barishal, Laxmipur, Chandpur, Noakhali, Feni, Chattogram and Cox’s Bazar.

Read:Low pressure likely over North Bay in 72 hrs: Met office

Meanwhile, the well-marked low over west-central Bay and adjoining northeast Bay intensified into a depression and lies over coastal Odisha and adjoining Northwest Bay.

“It is likely to move west-northwestwards further,” according to a special bulletin.

Squally weather may affect the maritime ports, north Bay and adjoining coastal areas of Bangladesh. Maritime ports of Chattogram, Cox’s Bazar, Mongla and Payra have been advised to keep hoisted local cautionary signal No 3.

Read: Maritime ports asked to alert vessels of possible squall

Under its influence, deep convection is also taking place over north Bay and adjoining area.

"All fishing boats and trawlers in the North Bay have been advised to remain close to the coast and proceed with caution until further notice," the department said.

They are also advised not to venture into the deep sea, it added.