::Heat wave


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A heat wave is a prolonged period of excessively hot weather, which may be accompanied by high humidity, especially in oceanic climate countries. While definitions vary,<ref name="sciencemag">{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> a heat wave is measured relative to the usual weather in the area and relative to normal temperatures for the season. 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.<ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref>

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. A heat wave is considered extreme weather, and a danger because heat and sunlight may overheat the human body.

Heat wave sections
Intro   Definitions    Formation    Health effects    See also    Notes    External links   

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