Heat wave facts for kids
A heat wave is a long period of extremely hot weather, which may be followed by high humidity. There is no definition of a heat wave in which everyone agrees; the term depends on the usual weather in the area. Temperatures that people from a hotter climate consider normal can be called a heat wave in a cooler area if they are outside the normal climate pattern for that area. The term is used on both common weather changes and to very hot events which may occur only once a century.
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Heat wave Facts for Kids. Kiddle Encyclopedia.