The country’s maritime ports have been advised to hoist the local cautionary signal three to alert vessels of a possible squall as deep convection is taking place over the North Bay, said the weather department on Monday.

Squally weather is likely to affect the maritime ports, the North Bay, and the adjoining coastal areas of Bangladesh, said the Met office.

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And so, maritime ports in Chattogram, Cox’s Bazar, Mongla, and Payra have been advised to hoist local cautionary signal three.

"All fishing boats and trawlers in the North Bay have been advised to come close to the coast and proceed with caution until further notice," it added.

Rain or thunder showers accompanied by temporary gusty or squally wind is likely to occur in most parts of the country with moderately heavy to heavy falls at places over the country under the impact of the deep convection, Bangladesh Meteorological Department said.

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Deep convection refers to the thermally driven turbulent mixing that moves air parcels from the lower to the upper atmosphere.