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

At 2:08 p.m. on Monday, the National Weather Service released a heat advisory in effect until Tuesday at 9 p.m. for Lauderdale, Colbert, Franklin, Lawrence, Limestone, Madison, Morgan and Cullman counties.

The National Weather Service office in Mobile, Alabama, issued a heat advisory in Escambia, Santa Rosa and Okaloosa counties between 10 a.m. and 7 p.m. Monday. Heat index values are forecast to reach as high as 109℉ in portions of south central and southwest Alabama, northwest Florida and southeast Mississippi.

The National Weather Service says heat indices as high as 114 are possible in Panama City and issued an advisory. Meanwhile an Atlantic system brews.

The National Weather Service issued a heat advisory at 11:32 a.m. on Monday valid for Tuesday between 10 a.m. and 7 p.m. for Choctaw, Clarke, Wilcox, Monroe, Conecuh, Butler, Crenshaw and Covington counties.

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.