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Heat wave, also called heatwave, period of prolonged abnormally high surface temperatures relative to those normally expected. Heat waves may span several days to several weeks and are significant causes of weather-related mortality, affecting developed and developing countries alike. Globally, the increasing frequency and intensity of heat waves observed since the 1950s has been associated with climate change.
According to the Indian Meteorological Department (IMD), a heat wave is qualified when air temperatures of at least 40 Â°C (104 Â°F) in the plains or greater than 30 Â°C (86 Â°F) in the hilly regions. For the IMD classification of heat waves, temperatures greater than 46 Â°C (114.8 Â°F) are considered and classified as severe heat waves.