It was centred at about 760-km southwest of Chittagong port, 715- km southwest of Cox's Bazar port and 590-km south-southwest of Mongla port yesterday evening, said a special bulletin of the Met Office.

It is likely to intensify further and move in a north or northwesterly direction. Maximum sustained wind speed within 48-km of the depression centre is about 50 kph rising to 60 kph in gust or squalls. Sea will remain rough.

Under its influence, steep pressure gradient persists over north Bay and squally weather may affect the ports and coastal districts, Met Office sources said.

Maritime ports of Chittagong, Cox's Bazar and Mongla have been advised to keep hoisted local cautionary signal number three.

All fishing boats and trawlers over north Bay have been advised to remain in shelter until further notice.

Moderate to heavy rain may occur at many places in Khulna, Barisal, Chittagong, Sylhet, Dhaka and Rajshahi divisions.

The low-lying areas of the coastal districts of Noakhali, Laxmipur, Bhola, Patuakhali, Barisal, Chandpur, Barguna, Pirojpur, Jhalakathi, Bagerhat, Khulna, Satkhira and their offshore inlands and chars are likely to be inundated by wind driven surge of 2-4 feet high above normal astronomical tide.