It moved northwards towards the coasts over the west central Bay of Bengal and was centred at about 800-900 kilometres from the maritime ports at 3am on Tuesday, according to the Bangladesh Meteorological Department.
It is likely to move in a northerly direction and then recurve north-northeastwards before cutting its path through the Bangladesh coast between Khulna and Chattogram between Tuesday late night and Wednesday afternoon, said Senior Meteorologist Md Bazlur Rashid.
Mongla and Payra ports were asked to keep hoisting Danger Signal No. 7 while Chattogram and Cox's Bazar ports were issued Danger Signal No. 6.
Coastal districts of Satkhira, Khulna, Bagherhat, Jhalokathi, Pirozpur, Borguna, Patuakhali, Bhola, Barishal, Laxmipur, Chandpur, Noakhali, Feni, and Chattogram will be under the danger signals. The low-lying areas of these districts may experience flooding from tidal waves 4 to 5 feet higher than normal and heavy rainfall with winds packing speeds of up to 160kph during Cyclone Amphan, the Met Office warned.
Maximum sustained wind speed within 90km of the cyclone centre was about 225kph rising to 245kph in gusts or squalls. The sea will remain very high near the cyclone centre.
All fishing boats and trawlers over the north Bay and deep sea have been advised to take shelter immediately and remain there until further notice.
Super cyclone Amphan barrels toward Bangladesh