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 chances for a scattered area of showers and thunderstorms to develop into something more increased overnight, but remain low, forecasters said.

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.

Moving south, Port St. Lucie, Naples and Cape Coral could see highs of 91, while Palm Beach was forecast for 87 degrees. Miami and Fort Lauderdale were forecast, respectively, for highs of 88 and 91 on Tuesday.

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

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

The National Weather Service has issued another heat advisory for Central Florida, which includes Walt Disney World and Universal Orlando.

Heat Advisory to start workweek. For more News, Weather, and Sports in Panama City, Florida visit: <a href="https://www.mypanhandle.com">https://www.mypanhandle.com</a> Trump Suggests He’ll Block Washington Commanders Stadium Deal If Name Change Isn’t Reversed ‘Immediately’