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.

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.

Both the temperatures and the humidity will soar Friday, Radell said. Temperatures will reach the mid-90s in most areas and heat indexes, or what the temperatures will feel like, will range from the mid-90s on the North Fork to the low 100s in western Nassau. The forecast calls for a chance of showers and thunderstorms Friday afternoon and evening.

A heat advisory will be in effect Friday. While thunderstorms will cool things down for the weekend, the extreme heat will return early next week.

The National Weather Service is warning South Carolina residents to stay cool following a predicted heat index of 109 °F on Saturday, with hot temperatures continuing into next week.

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