Extreme heat is the deadliest weather-related hazard in the U.S., according to data from the CDC.

Heat and humidity are stretching east from the Mississippi River valley, with heat indices topping 110F in some areas

Extreme heat is the deadliest weather-related hazard in the U.S., according to data from the CDC.

Heat advisories affect 168 million Americans in the mid-west, south-east and parts of the north-east US.