A heat wave is a prolonged period of excessively hot
weather, which may be accompanied by high
humidity. There is no universal definition of a heat wave; the term is relative to the usual weather in the area. 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. The term is applied both to routine weather variations and to extraordinary spells of heat which may occur only once a century. Severe heat waves have caused catastrophic crop failures, thousands of deaths from
hyperthermia, and widespread
power outages due to increased use of
air conditioning.
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