Ø  Will it rain on Mahalaya 2025.?

Ø  Which districts heavy rain West Bengal.?

Ø  How long will thunderstorm last Kolkata.?

Ø  What is cyclonic circulation Bay of Bengal.?

Ø  When will low pressure form September 2025.?

As Bengal celebrates Mahalaya today (September 21), dark clouds are set to dominate the afternoon sky with thunderstorms and scattered showers across districts. A cyclonic circulation currently over North Andaman Sea and adjoining Myanmar coast will move to North Bay of Bengal by Monday (September 22), triggering a low-pressure system by Thursday (September 25) that promises to bring heavy rainfall across South Bengal through the Durga Puja festival.

Details & Context

Current Weather Pattern

A strong cyclonic circulation positioned over North Andaman Sea and Myanmar coast is advancing northward and will reach North Bay of Bengal by September 22. Weather officials predict formation of a low-pressure area over northeast Bay of Bengal by September 25, intensifying rainfall across coastal and interior South Bengal districts.

District-wise Forecast

·       Today (Mahalaya - Sept 21)

o   Morning: Partly cloudy skies across Bengal

o   Afternoon onwards: Complete cloud cover with increased rain probability

o   Heavy rain warning: South 24 Parganas district

o   Thunderstorms with 30-40 kmph gusty winds expected

·       Monday-Wednesday (Sept 22-24)

o   Heavy rain districts: South 24 Parganas, East & West Midnapore

o   Wednesday addition: Bankura joins the heavy rain list

o   Scattered thunderstorms continue across all South Bengal districts

·       North Bengal Outlook

o   Gradual decrease in rainfall intensity from today

o   Monday: Thunderstorms likely in Malda and North Dinajpur

o   Friday: Heavy rain expected in Darjeeling

Quotes

·       Meteorologist Anvesha Bhattacharya (Alipore Weather Office): “Substantial water vapor from Bay of Bengal is entering South Bengal. Scattered thunderstorms will continue across all districts for the next five days”.

·       Weather Department Official: “The cyclonic circulation will reach North Bay of Bengal on September 22. We expect a low-pressure area to form over east-central Bay of Bengal near Bangladesh-Myanmar coast between September 25-26”.

Additional Information

Temperature & Humidity Levels

·       Kolkata today: Maximum 34°C, Minimum 27°C with 95% humidity

·       Wind speeds: 30-40 kmph gusts accompanying thunderstorms

·       Weekly outlook: Temperatures ranging 28-34°C through September

Puja Season Impact

The monsoon remains active over Bengal until first week of October with official withdrawal date set for October 10. Heavy rainfall is particularly expected during Navami and Dashami (peak Puja celebration days), potentially affecting outdoor festivities and immersion processions.

Safety Advisories

·       Waterlogging expected in North and Central Kolkata areas

·       Fishermen advised to avoid Bay of Bengal waters

·       Coastal districts should prepare for storm surge conditions

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Impact Analysis

Conclusion

Mahalaya 2025 marks the beginning of both Durga Puja celebrations and an active weather period for Bengal. With cyclonic circulation developing and low pressure expected by September 25, residents should prepare for intermittent heavy rainfall throughout the festival season. While the rain may dampen outdoor activities, proper preparation and monitoring of weather updates will help ensure safe celebrations.

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