More dangerous heat is forecast from the Midwest to the mid-South, and along the East Coast this weekend.  

HERE ARE THE HEALTH RISKS OF EXTREME HEAT

Heat alerts

Heat alerts in the southern U.S.  (Credit: Fox News)

Over 100 million people will be affected by the extreme temperatures, with humidity making it feel much worse.

Near record heat

Near record heat across the U.S. on Friday (Credit: Fox News)

Strong-to-severe thunderstorms will threaten the Midwest today and tomorrow.  

Severe storm threat

The threat of severe storms in the Midwest on Saturday (Credit: Fox News)

Large hail, damaging winds and isolated tornadoes will be possible, along with heavy rain.

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The Southwest and southern Rockies will also be the target for heavy rain and isolated flash flooding through the weekend.