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

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 ...

A heat advisory was released by the National Weather Service on Monday at 12:23 a.m. valid between 10 a.m. and 6 p.m. for ...

The National Weather Service released a heat advisory at 11:48 p.m. on Sunday valid from Monday 11 a.m. until Tuesday 9 p.m.

On Monday at 12:56 a.m. the NWS Greenville-Spartanburg SC issued an updated heat advisory valid between noon and 8 p.m. The ...

On Sunday at 1:18 p.m. the NWS Greenville-Spartanburg SC released a heat advisory valid for Monday between noon and 8 p.m.

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

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

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 ...

Heat index values could rise to 110-112 degrees, according to the National Weather Service. Higher rain chances later in the week could offer relief.

The combination of heat and humidity will make it feel like 105-111 degrees for a sustained amount of time. Actual temperature highs will soar into the mid-90s.