The National Weather Service already has issued extreme heat warnings, watches and advisories across a swath of the Midwest and South.

A HEAT ADVISORY and AIR QUALITY ALERT is in effect for much of northeast Ohio. The heat and humidity will start to increase Wednesday and will stay hot through Friday.

This morning will start out really nice and quiet, with clear skies and comfortable temperatures out-the-door. Expect a great sunrise with temperatures holding in the upper 60s for most, as dry

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

Heat and oppressive humidity will greatly impact your daily routine this week, and First Alert Weather Impact Days have been issued through Thursday due to the excessive heat.

High pressure remains firmly in place for the time being and that is allowing us to see plenty of sunshine, but also hot and steamy afternoons.

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 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.