About 110.8 million people — 33 percent of the population of the contiguous United States — live in the areas expected to have dangerous levels of heat.
The
heat index is a measure of how hot it really feels outside, taking into account humidity along with temperature. The measurement is used to indicate when the level of heat is dangerous for the human body while in the shade. When out in the sun, a person could perceive that temperature as being higher by up to 15 degrees Fahrenheit (8.3 degrees Celsius).
Risks associated with heat index levels
Caution
Fatigue is possible after long exposure or exercise.
A heat index of 80 to 90degrees Fahrenheit
Extreme caution
Possible risk of heat stroke, heat cramps or heat exhaustion after long exposure or exercise.
90 to 103 degrees
Danger
Heat cramps or heat exhaustion is likely. After long exposure or exercise, heat stroke is also possible.
103 to 125 degrees
Extreme danger
Heat stroke is highly likely.
125 degrees or higher
Risk level definitions are from
NOAA.
Hundreds of people die from extreme heat in the United States every year. On hot days, the National Weather Service
recommends that people drink fluids, stay in cooler rooms, keep out of the sun and check up on relatives and neighbors, especially older people and those who live alone.
How hot will it feel in your area?
Look up the coming week’s forecast for places across the country, and see the heat index forecast in or near your city or town.
Heat index forecast for…
