Heat wave sweeps in Delhi, mercury rises to 45 deg C

Large parts of the country witnessed severe heatwave over the last week with temperatures even reaching 50 degrees Celsius in Rajasthan. If the maximum temperature of a weather station in the plains crosses 45 degrees Celsius for two consecutive days, it is termed heatwave. And it the temperature reaches 47 degrees Celsius for two days, it is termed severe heatwave. If the temperature rises between 4.5-6.4 degrees Celsius above the normal, it is also termed heatwave. If it goes beyond that, it is classified as severe heatwave.