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. Here's what to know.

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

A heat advisory is in effect from noon until 8 p.m. Heat indices will soar up to 108° this afternoon. Isolated to scattered showers & storms are likely. Any storm that develops could produce wind gusts of 40-60 mph, heavy rainfall, and small hail. High temperatures will soar into the mid-upper 90s in the Upstate, and near 90° in the mountains.

A heat advisory is again in place for the Tampa Bay area on Monday before tropical downpours return in the coming days.

A Heat Advisory will be in effect Monday for much of east-central and parts of central Georgia. Scattered thunderstorms are expected Monday afternoon and evening, with a marginal risk of isolated severe storms across north Georgia.

On Sunday at 1:44 a.m. a heat advisory was released by the National Weather Service valid between 10 a.m. and 7 p.m. for Mobile and Baldwin counties.