Kolkata is all set to witness the arrival of Kalbaisakhi rain and thunderstorms starting today, April 28, 2025, as the India Meteorological Department (IMD) has issued a yellow alert for the city and surrounding districts lasting till May 3. This weather phenomenon is expected to bring much-needed relief from the intense heat and humidity that has gripped the region in recent weeks.
What is Kalbaisakhi?
Kalbaisakhi, also known as Nor’westers or Kalboishakhi, is a localised weather event occurring mainly in the eastern and northeastern parts of India, including West Bengal. It typically happens in the months of April and May, marking the transition from spring to summer. Characterized by sudden thunderstorms, strong gusty winds, heavy rain, and sometimes hail, Kalbaisakhi storms develop when cold and hot air masses clash, often producing dark black clouds and dramatic weather changes in a short span of time.
The term "Kalbaisakhi" comes from Bengali, where "Kal" means black and "Baisakhi" refers to the first month of the Bengali calendar. The ominous black clouds that gather before the storm give this weather event its name. These storms usually occur in the late afternoon or early evening and last for a few hours.
What to Expect in Kolkata?
Starting April 28, Kolkata will experience light to moderate rain or thundershowers accompanied by gusty winds reaching speeds of 40-50 km/h and lightning at one or two places. This weather pattern is expected to persist for several days, with the possibility of thunderstorms continuing through May 3. The temperature will hover between 24°C and 34°C, with a gradual cooling effect as the rain progresses. The maximum temperature could drop by 3 to 5 degrees Celsius, providing relief from the scorching heat.
Nearby districts such as East Burdwan, West Midnapore, and parts of North Bengal like Darjeeling and North Dinajpur will also see similar weather conditions, including heavy rain and strong winds. Some districts, including Purulia, Bankura, and Hooghly, are on high alert for thunderstorms with fierce gusts reaching up to 70 km/h.
The Impact and Significance of Kalbaisakhi
Kalbaisakhi storms bring both benefits and challenges. On the positive side, these rains help cool down the temperature, reduce humidity, and clear the air of pollutants, offering temporary relief to people suffering from heatwaves. For farmers, the rain is crucial as it provides much-needed water to crops before the monsoon season begins. This can improve agricultural productivity and support the local economy.
However, the strong winds and sudden hailstorms associated with Kalbaisakhi can cause damage to crops, property, and infrastructure. The unpredictability of these storms means that while they bring relief, they also require caution and preparedness from residents and authorities alike.
Preparing for the Week Ahead
With the IMD’s yellow alert in place, residents of Kolkata and neighboring districts are advised to stay updated on weather forecasts and take necessary precautions. This includes securing loose objects, avoiding outdoor activities during thunderstorms, and being prepared for possible disruptions caused by heavy rain and gusty winds.
The arrival of Kalbaisakhi is a reminder of the dynamic nature of weather in the region, reflecting the complex interplay of atmospheric conditions that shape the climate of eastern India. While it signals the end of the dry, hot spell, it also marks the beginning of the pre-monsoon phase, which will eventually lead to the full monsoon rains.
Kolkata’s upcoming Kalbaisakhi rain and thunderstorms are set to break the heatwave and bring a welcome change in weather. The IMD’s week-long alert underscores the significance of this meteorological event, which is both a natural spectacle and a vital part of the region’s climatic cycle. As the city braces for this wet spell, residents can look forward to cooler temperatures and the refreshing effects of the pre-monsoon showers, while staying mindful of the storm’s potential challenges.
This seasonal phenomenon, deeply rooted in the cultural and natural landscape of Bengal, continues to shape life in Kolkata and beyond, blending science, tradition, and the rhythms of nature into the everyday experience.
With inputs from agencies
Image Source: Multiple agencies
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