o   West Bengal Rain Forecast: Cyclone Alert Bay of Bengal

o   Bengal Weather Update: IMD Cyclone & Rain Alert 2025

o   West Bengal Weather Alert: Heavy Rain & Cyclone Warning

Bengal Weather Update: West Bengal is preparing for continuous rainfall starting Friday as twin weather systems develop over the Bay of Bengal and Arabian Sea, according to the India Meteorological Department (IMD). A well-marked low-pressure area over the southwest Bay of Bengal has intensified into a deep depression, while another cyclonic circulation is gaining strength near the Andaman Sea, creating favorable conditions for widespread rain across multiple districts through the upcoming week.

Details & Context

The IMD confirmed that a well-marked low-pressure area formed over the southwest Bay of Bengal on October 21, 2025 and rapidly intensified into a deep depression by afternoon. This system, initially positioned approximately 400 kilometers from the Tamil Nadu coast is moving west-northwestward toward north Tamil Nadu, Puducherry and south Andhra Pradesh coasts. While this depression will not directly impact Bengal, its influence will trigger atmospheric changes leading to widespread rainfall across the state.

·       North Bengal Weather Forecast

o   Five districts in North Bengal—Darjeeling, Kalimpong, Jalpaiguri, Alipurduar and Coochbehar—are expected to experience thunderstorms with lightning and moderate to heavy rainfall from Saturday through Monday. The western disturbance will primarily affect the hilly regions starting Friday with rain intensifying over the weekend. IMD data shows that isolated light to moderate rain or thundershowers are likely over northern parts of North Bengal during the first half of the week.

o   Weather stations in Kalimpong recorded temperatures around 16°C with increasing cloud cover, while Jalpaiguri and Darjeeling districts are forecasted to see afternoon showers and thunderstorm activity starting October 24. The hill districts may experience pleasant weather conditions with temperatures ranging between 18-26°C, though sudden downpours remain possible.

·       South Bengal Alert

o   Coastal districts of South Bengal will witness significant rainfall beginning Friday. South 24 Parganas will be the first to receive rain on October 25, followed by East Midnapore joining on Saturday. By Sunday and Monday, Jhargram district will also experience precipitation. The Regional Meteorological Centre predicts that by Tuesday, the entire South Bengal region will face cloudy skies with light to moderate thundershowers accompanied by lightning.

o   The IMD has issued thunderstorm warnings for multiple South Bengal districts including

-        Kolkata

-        Howrah

-        Hooghly

-        North 24 Parganas

-        Murshidabad

-        Bankura

-        East Bardhaman

-        West Bardhaman

-        Birbhum

Residents in low-lying areas are advised to remain cautious due to the possibility of waterlogging and localized flooding.

Bay of Bengal Weather Systems

Two distinct weather systems are currently developing in the Bay of Bengal region. The first system—a deep depression over the southwest Bay of Bengal—has maximum sustained wind speeds of 65-75 kmph with gusts reaching 85 kmph. This depression is tracking toward the Tamil Nadu-Puducherry coast and is expected to make landfall between October 22-23, 2025.

Simultaneously, a cyclonic circulation has formed near Indira Point in the southern Andaman Sea, which is gradually intensifying. The IMD’s New Delhi Meteorological Office is closely monitoring whether this circulation will develop into a depression and eventually a cyclonic storm. Fishermen and tourists in the Andaman and Nicobar Islands have already been issued safety advisories.

·       Expert Analysis

o   IMD Director General Mrutyunjay Mohapatra stated that most weather models indicate the development of a low-pressure area over the southeast Bay of Bengal and adjoining Andaman Sea with further intensification and west-northwest movement. “There is a favorable environment for cyclogenesis over Bay of Bengal next week,” Mohapatra confirmed, adding that more details regarding intensity and trajectory will become clearer in the coming days.

o   Director of Bhubaneswar Meteorological Centre Manorama Mohanty emphasized, “We are closely monitoring the anticipated weather system and more details like its further intensity and path will be known in the coming days”. The presence of twin cyclonic systems on either side of the equator in both the Arabian Sea and Bay of Bengal basins is causing some inconsistencies in model forecasts.

Additional Information

October is historically known as the cyclone month for coastal states like West Bengal and Odisha. The 1999 super cyclone that devastated Odisha occurred on October 29, while other significant October cyclones including Phailin (2013), Hudhud (2014), Titli (2018) and Dana (2024) underscore the region’s vulnerability during this period.

The southwest monsoon officially withdrew from the entire country on October 16, 2025, yet the post-monsoon season continues to bring significant weather activity. Weekly rainfall data shows West Bengal received 16.9 mm of rainfall during October 9-15, against a normal of 28.8 mm, representing a 41% deficit. However, seasonal rainfall from October 1-15 totaled 135.6 mm compared to the normal 86.8 mm, showing a 56% excess.

·       No Direct Cyclone Threat to Bengal

o   Despite the active weather systems, meteorologists confirm that Bengal does not face an immediate cyclone threat. The current depression over the southwest Bay of Bengal is moving toward Tamil Nadu and Puducherry, maintaining a trajectory away from Bengal’s coastline. However, the atmospheric circulation and moisture-laden winds associated with these systems will continue to influence rainfall patterns across West Bengal through early November.

Read More: Horror in Hooghly: Five Street Dogs Brutally Mutilated in Shocking Animal Cruelty Case

Impact Analysis

The continuous rainfall forecast poses several implications for West Bengal. Agricultural activities may be disrupted, particularly in North Bengal’s tea-growing regions and South Bengal’s rice cultivation areas. Urban centers like Kolkata, which already experienced waterlogging during recent weather events, need to prepare drainage systems for the anticipated downpours.

Transportation could face challenges, especially in hilly districts of North Bengal where landslides become more likely during sustained rainfall. Ferry services in the Sundarbans region covering North and South 24 Parganas districts may experience disruptions. The state administration has been advised to keep relief camps ready with arrangements for food, drinking water and medicines as a precautionary measure.

Temperature patterns are expected to remain moderate with maximum temperatures hovering around 31-33°C and minimum temperatures between 22-25°C across most districts. The high humidity levels, ranging from 70-95%, will make the weather feel warmer than actual temperatures.

Conclusion

As West Bengal prepares for a week of continuous rainfall, residents across North and South Bengal should remain vigilant and follow weather updates from official sources. While the state is not facing a direct cyclone threat, the influence of multiple weather systems over the Bay of Bengal and Arabian Sea will ensure sustained precipitation through the next several days. The IMD continues to monitor these developing systems closely, providing regular updates as conditions evolve.

Authorities have activated disaster management protocols and emergency response teams remain on standby to address any weather-related emergencies. Citizens are advised to avoid unnecessary travel during heavy rainfall periods and stay away from waterlogged areas and vulnerable structures.

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