A low pressure system active over Bay of Bengal is unlikely to provoke intense rain in Kolkata even after gaining steam and entering land.
The city is hoping to get heavy rainfall activity between Tuesday and Thursday, said an IMD official. South and North 24-Parganas, Purba Medinipur, Paschim Medinipur and Jhargram districts are likely to get intense downpour.
Weather scientists following the system said it took shape on Sunday and was near the south Odisha and north Andhra coastline on Monday. It is tipped to escalate into a depression and enter land on Tuesday. Then, it is hoped to move west, through Odisha and Chhattisgarh. The system is likely to be enfeebled as it keeps moving, said an IMD official.
The system has moved further south than expected, the official said.
The low-pressure zone was near Puri on Monday evening. The monsoon trough stretched from Rajasthan to the Bay, meeting the system.
“The southwest sector of any system, be it a cyclone or a low-pressure area, gets maximum downpour. In the case of the present system, Gopalpur in Odisha and adjoining areas are on the southwest of its core,” said G.K. Das, director of IMD, Kolkata.
Gopalpur is over 600km from Kolkata.
The moving of the monsoon trough is, however, expected to bring rain in Kolkata over the next couple of days. “The trough will escalate as the system enters land. The eastern part of the trough is likely to come closer to south Bengal on Wednesday. Kolkata is hoped to be in the convergence (cloud formation) zone,” said Das.
The civic authorities in Kolkata said they were ready. “We have an adequate number of pumps and the pumping stations are alert. We have placed sufficient portable pumping stations in areas prone to waterlogging,” said an official of the KMC’s drainage department.
But he also warned that sustained heavy rain can lead to waterlogging despite the best efforts of the workers and machines.
A IMD bulletin on Sunday had forecasted “heavy rain” in Kolkata and “very heavy rain” in some districts because of the system. On Monday, the IMD issued a restricted bulletin, in which Kolkata did not feature in places expected to get heavy rain.
According to the latest news, heavy rain is likely in South 24-Parganas, Jhargram and Purba and Paschim Medinipur on Tuesday, Wednesday and Thursday. North 24-Parganas is likely to get heavy rain on Wednesday.
South 24-Parganas, Purba Medinipur, Paschim Medinipur and Jhargram are also likely to get thunderstorms on Tuesday and Wednesday, the forecast said.
“Light to moderate rain with thunder” is anticipated across south Bengal between Tuesday and Thursday.
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