The heat index considers the actual temperature and amount of moisture in the air using the dew point or relative humidity.

All of Florida will be under heat advisories Monday, July 21, as a heat dome spreads from the Ohio and Mississippi valleys.

The Pensacola area is under a heat advisory for the second day in a row. A cluster of showers and thunderstorms will offer ...

A heat advisory for Florida's Treasure Coast is in effect from noon through 6 p.m., with heat index values from 109 to 112 ...

The National Weather Service office in Mobile, Alabama, issued a heat advisory in Escambia, Santa Rosa and Okaloosa counties ...

Hot and humid conditions continue for Central Florida on Monday with the region under a heat advisory from noon-6 p.m., ...

A heat advisory has been issued for Miami-Dade and Broward counties for Monday and will be in effect noon to 6 p.m. South ...

Escambia, Santa Rosa and Okaloosa counties are under another heat advisory as a massive heat dome impacts over 100 million Americans.

How low should you set your thermostat for as record-breaking heat sweeps over the country? Here's what experts and other ...

Forecasters have issued a heat advisory for Friday in Miami-Dade, Broward and Palm Beach counties, with temperatures expected ...

The heat index could get as high as 111 in South Florida, with the strongest heat expected along the southern Gulf Coast.