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A depression that formed over the north-west Bay of Bengal has intensified and is gradually moving towards the northern Odisha coast. According to the Alipore Meteorological Department in Kolkata, the system is expected to strengthen into a deep depression within the next 24 hours, bringing heavy rainfall across parts of West Bengal, particularly the coastal and adjoining districts.

 

Subject: Well Marked Low Pressure area over Northwest Bay of Bengal off Odisha coast:

A Low Pressure Area formed over Northwest Bay of Bengal off Odisha coast in the morning (0830 hours IST) of yesterday, the 27th May 2025. It lay as a Well Marked Low Pressure Area over the same… pic.twitter.com/mA0DLdoy3f

— India Meteorological Department (@Indiametdept) May 28, 2025

 

Beginning Wednesday, coastal areas of South Bengal—including districts such as North and South 24 Parganas, East and West Midnapore—are likely to receive heavy showers. Thunderstorm intensity is forecast to increase significantly on Thursday and Friday. Gusty winds with speeds of 30–40 kmph are also expected in several areas, including Kolkata.

 

The Kolkata sky remained overcast on Wednesday morning, with scattered thunderstorms likely to develop later in the day. Weather officials have also indicated that the south-west monsoon is expected to reach North Bengal within 48 hours.

 

An orange alert has been issued for at least 10 districts on Thursday, including North and South 24 Parganas, East and West Midnapore, Hooghly, Jhargram, Purulia, Bankura, and East and West Burdwan. These areas are expected to receive heavy to very heavy rainfall ranging from 7 to 20 centimetres, with storm winds possibly reaching 50 kmph.

Also read: Low pressure area in Bay of Bengal, Odisha districts on alert

 

Meanwhile, north Bengal is expected to experience thunderstorms from Thursday. While no warnings have been issued for Wednesday, isolated regions may receive light to moderate showers with lightning. From Thursday, heavy to very heavy rainfall is forecast in Jalpaiguri, Cooch Behar and Alipurduar. Other northern districts are likely to face severe weather from Friday, which could result in landslides in hilly areas, according to weather officials.

 

In coastal regions, including the Sundarbans and Digha, the sea is expected to remain rough throughout the week due to the depression’s impact. Gusty winds between 55 and 65 kmph are forecast along the coastline, prompting authorities to bar fishermen from venturing into deep-sea waters.

 

Preparations are underway along the coastline. Administrative teams are active in the Sundarbans and Namkhana areas, setting up relief camps and conducting awareness drives using loudspeakers. Namkhana Panchayat Samiti President Abhishek Das personally inspected several relief camps and held discussions with local residents regarding safety and emergency management.