Maritime ports of Chittagong, Cox's Bazar, Mongla and Payra have been advised to hoist local cautionary signal no-three.
A monsoon low has formed over Northwest Bay and adjoining Bangladesh-West Bengal coast, a Met office weather bulletin said.
Squally weather may effect over North Bay, adjoining coastal area of Bangladesh and the maritime ports, according to the bulletin.
All fishing boats and trawlers over North Bay have been advised to take shelter immediately and remain in shelter until further notice.
