Heat is typically the leading cause of weather related fatalities each year. A heat wave is a period of abnormally hot and humid weather, generally lasting more than 2 days. Heat waves have the potential to cover a large area, exposing a high number of people to a hazardous combination of heat and humidity, which can be very taxing on the body. Learn how to stay safe during a heat wave at www.weather.gov/heatsafety #HeatSafety Heat-stress-collaps