The well-marked low over Southeast Bay intensified into a depression, then into a deep depression over Southeast Bay and adjoining areas and was centred Wednesday morning.
Maximum sustained wind speed within 48 kilometres of the deep depression centre is about 50 kilometres per hour rising to 60 kilometres per hour in gusts or squalls.
The sea will remain rough near the deep depression centre.
Maritime ports of Chattogram, Cox's Bazar, Mongla and Pyra 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 remain close to the coast and proceed with caution.
They are also advised not to venture into the deep sea.
Meanwhile, severe heat wave is sweeping over the districts of Rajshahi, Chuadanga, Kushtia and Patuakhali and mild to moderate heat wave is sweeping elsewhere over the country and it may continue.
Country's maximum temperature on Tuesday was recorded 41.2 degree Celsius at Chuadanga and minimum temperature on Wednesday was 22 degree Celsius jointly at Sayedpur and Rajarhat.
Bd-pratidin English/Golam Rosul
