Duration of Adverse Weather From April 20 to April 27, 2026, there is a possibility of intermittent storms, rain, and Kalbaishakhi events occurring across the entire state.
The Alipore Meteorological Department has forecast another significant change in the weather patterns of South Bengal around mid-April 2026. Driven by the influence of a cyclonic circulation and moisture influx, the likelihood of stormy weather—including Kalbaishakhi (Nor'westers) and gusty windsis intensifying across South Bengal starting Monday, April 20, 2026.
Duration of Adverse Weather From April 20 to April 27, 2026, there is a possibility of intermittent storms, rain, and Kalbaishakhi events occurring across the entire state.
Cyclonic Circulation and Impact Under the influence of a cyclonic circulation and a trough positioned over South Bangladesh and adjoining Gangetic West Bengal, a substantial amount of moisture is flowing into the state from the Bay of Bengal; this influx is facilitating the formation of Kalbaishakhi storms.
South Bengal Kolkata, Howrah, Hooghly, North 24 Parganas, South 24 Parganas, Nadia, East and West Bardhaman, Birbhum, Bankura, and West Medinipur are likely to experience rain accompanied by thunderstorms and gusty winds blowing at speeds of 50–60 km/h.
North Bengal Darjeeling, Kalimpong, Jalpaiguri, Cooch Behar, and Alipurduar are forecast to receive light to moderate rainfall, with isolated instances of heavy rain.
Temperature and Discomfort Although the rain may offer temporary relief, the prevailing high daytime and nighttime temperatures mean that sultry conditions and general discomfort are expected to persist.

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