Extreme heat is defined as temperatures that hover 10 degrees or more above the average high temperature for a region and last for several weeks. An extreme heat hazard occurs when other factors, such as humidity or drought, contribute to the high temperatures.

Extreme heat brings with it the possibility of heat-induced illnesses. Conditions that can induce heat-related illnesses include stagnant atmospheric conditions and poor air quality. However, most heat disorders occur because the victim has been overexposed to heat or has over-exercised for his or her age and physical condition. Older adults, young children, and those who are sick or overweight are more likely to succumb to extreme heat.

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BY USA.gov team