The unremitting rain, triggered by a depression in the Bay, is likely to stop by Sunday morning and the overall weather situation may improve by this time, a met office official has told BSS.
"The non-stop rain will decrease by today's evening. But it will take time for a better weather till tomorrow morning," Abdul Mannan, a meteorologists at Bangladesh Meteorological Department (BMD), said on Saturday.
He said: "We forecast light to moderate rain with moderately heavy to very heavy falls at many places over the country for the next 24 hours ending at 9am tomorrow and advised the maritime ports - Chittagong, Cox's Bazar, Mongla and Payra - to keep hoisted local cautionary signal number three."
All river ports have been asked to hoist riverine warning signal number two so that the waterways passengers can journey with a caution, Mannan added.
The meteorologists also said all fishing boat and trawler over North Bay have been advised to remain in shelter until further notice.
"The land depression over Gangetic west Bengal and adjoining Odisha and southwestern part of Bangladesh moved north-northeastwards and was centered at 9am today over west Bengal Western part of Bangladesh," said a BMD weather bulletin this morning.
It is likely to move in a north or northeasterly direction further and weaken gradually, the bulletin said, adding that under its influence, steep pressure gradient persists and deep convection is continuing over North Bay.
Under the influence of the land depression, the low-lying areas of the coastal districts of Cox's Bazar, Chittagong, Noakhali, Laxmipur, Feni, Chandpur, Bhola, Barisal, Patuakhali, Jhalokathi, Pirozpur, Borguna, Bagherhat, Khulna, Satkhira and their offshore islands and chars are likely to be inundated by the wind driven surge of 1-2 feet height above normal astronomical tide, the bulletin said.
Day and night temperature may fall slightly over the country.
Country's highest rainfall in last 24 hours ending at 6am today was recorded 271mm in Gopalgonj.