The National Weather Service forecasts highs between 95 and 100 before temperatures level off. What one doctor recommends for staying safe outdoors

Most of Ohio is under a heat advisory with temperatures that will feel 100-plus. Here's the difference between a heat advisory, heat watch and heat warning.

From Texas to New England, millions of Americans are facing dangerously hot temperatures that have led the National Weather Service to issue heat advisories and extreme heat warnings this week.

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 has issued a severe thunderstorm watch for Connecticut. The entire state is under the severe thunderstorm watch, according to the National Weather Service. The watch is in effect until 9 p.m., according to the National Weather Service.

Meteorologists warned that the oppressive heat wave is part of a larger system impacting much of the Southeast and Midwest.

At 10:45 a.m. on Friday, the National Weather Service issued a heat advisory valid between noon and 8 p.m. for Lackawanna and Luzerne counties.

The National Weather Service issued a heat advisory at 3:03 a.m. EDT on Wednesday valid for Thursday between 11 a.m. EDT and 8 p.m. EDT for Isabella, Montcalm, Gratiot, Ottawa, Kent, Ionia, Clinton, Allegan,