Maritime ports of Chattogram, Cox's Bazar, Mongla and payra have been advised to lower local cautionary signal number three but instead, hoist local warning signal number four
The severe cyclonic storm ''Bulbul'' over the west-central bay and adjoining east-central bay moved north-northwestwards over the same area at 6 am on Friday.
It was centered about 760 km southwest of Mongla port and 650 km southwest of Payraport, the Met office said in a special weather bulletin.
It is likely to intensify further and move in a north-northwesterly direction. Under the peripheral influence of the severe cyclonic storm ''Bulbul'', gusty/squally weather may affect the maritime ports, North Bay and coastal areas of Bangladesh.
The maximum sustained wind speed within 60 km of the severe cyclone center is about 90 kph rising to 110 kph in gusts or squalls. The sea will remain very high near the severe cyclone center, the Met Office added.
All fishing boats and trawlers over North Bay have been advised to take shelter immediately and remain in shelter till further notice.