The city has to brace itself for another spell of heavy rain under the influence of two cyclonic circulations at play together from two sides, the Met office said on Saturday.
One cyclonic circulation on Bay of Bengal is moving towards the Odisha coast. Another cyclonic circulation is positioned over south Bangladesh.
“Under their impact, all districts of coastal Bengal are likely to see increased rainfall over the next 24 hours. Heavy rain is not ruled out in Calcutta on Sunday,” G.K. Das, the director of the India Meteorological department, Calcutta.
Over the past week, the city has been under the grip of one wet spell after another, triggered by successive weather systems.
“A cyclonic circulation lies over northwest and adjoining west-central Bay of Bengal. It is very likely to move towards Odisha coasts during next 12 hours. Another cyclonic circulation lies over south Bangladesh,” said a Met bulletin on Saturday afternoon.
“The eastern end of the monsoon trough at mean sea level now passes through Daltonganj, Jamshedpur, Digha and thence southeastwards to northeast Bay of Bengal,” it added.
The sky has been overcast since Saturday morning. Light but persistent showers made up most of the day.
“The intensity of the showers is likely to go up from Saturday night,” said a Met official.
The weather in Calcutta is likely to improve from Monday, but only slightly. “The sky will be cloudy and the weather wet. But their intensity will be on the lower side,” he said.