The depression over southeast Bay and adjoining area moved west-northwestwards and intensified into a deep depression over the same area, said Bangladesh Meteorological Department (BMD) on Sunday.
It was centered at 06 am on Sunday about 1340 kms south of Chattogram port, 1270 kms south of Cox's Bazar port, 1300 kms south of Mongla port and 1265 kms south of Payra port.
It is likely to move west-northwestwards further and intensify into a Cyclonic storm.
Maximum sustained wind speed within 48 kms of the Deep Depression centre is about 50 kph rising to 60 kph in gusts or squalls. Sea will remain rough near the deep depression centre.
Maritime ports of Chattogram, Cox's Bazar, Mongla and Payra have been advised to keep hoisted distant cautionary signal No 1.
All fishing boats and trawlers over North Bay and deep sea have been advised to come close to the coast and proceed with caution till further notice.