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Heat Wave - Period of extreme heat, usually accompanied by high humidity.
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Heat Index - The relative humidity added to the air temperature-how hot it feels
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Heat Cramps - Muscle pains due to exertion-the first sign of heat-related problems
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Heat Exhaustion - A mild form of shock brought on by strenuous activity in the heat.
- Heat Stroke - A life threatening condition occurring when the body's temperature control system shuts down. Brain damage or death can result if the body is not cooled at once.