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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.
Temperatures that people from a hotter climate consider normal can be termed a heat wave in a cooler area if they are outside the normal climate pattern for that area.[2] The term is applied both to routine weather variations and to extraordinary spells of heat which may occur only once a century.