What Is A Heatwave?
April 7, 2025
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The Indian Meteorological Department (IMD) has sounded a heatwave alert for parts of north and western India, including Gujarat, Delhi and Rajasthan.
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A red alert means a severe heatwave persisting for over 2 days, with people at risk of heat illness and heat stroke.
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An orange alert means high temperature and severe heatwave for two days. A yellow alert means moderate temperature.
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Heatwaves are a period of temperatures unusually higher than what is normally expected in a region.
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Factors like high humidity and wind speed influence the impact of heatwaves.
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A heatwave is declared when the temperature crosses 40 degrees in the plains, 37 degrees in coastal areas, 30 degrees in the hills.
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Heatwaves in India usually occur from March to June and, in some rare cases, even in July.
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The peak month of the heat wave over India is May.
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