The deep depression over west-central Bay and adjoining area moved north-northeastwards and intensified into a cyclonic storm.
Named Cyclone Hamoon, it now lies over west-central Bay and adjoining northwest Bay and was centred at 6pm on Monday about 670km west-southwest of Chattogram port, 630km west-southwest of Cox's Bazar port, 540km southwest of Mongla port and 540km southwest of Payra port, according to the special bulletin by Bangladesh Meteorological Department.
It is likely to move north-northeastwards and intensify further, reads the bulletin.
Maximum sustained wind speed within 54 km of the cyclone centre is about 62 kph rising to 88 kph in gusts/squalls.
Sea will remain very rough near the cyclone centre, according to the bulletin.
Under the peripheral effect of the cyclone, heavy to very heavy rainfall with gusty or squally wind may occur over the north bay and coastal areas of Bangladesh, BMD predicted.
Maritime ports of Chattogram, Cox's Bazar, Mongla and Payra have been advised to hoist local warning signal no 4.
Meanwhile, all fishing boats and trawlers over the north bay and deep sea have been advised to take shelter immediately, the special bulletin reads.
According to BMD, light to moderate rain or thundershowers accompanied by temporary gusty and squally wind is likely to occur in the next 24 hours at most places over Dhaka, Khulna, Barishal and Chattogram divisions, and at many places over Mymensingh and Sylhet divisions and at a few places over Rangpur and Rajshahi divisions with moderately heavy to very heavy falls at places over southern part of the country.
Day and night temperatures may fall by 1-3 degrees Celsius over the country, according to the BMD bulletin.
