Much of the U.S. is under extreme heat warnings or advisories while New York, Philadelphia and Washington could feel like 100 degrees or more.

A phenomenon called "corn sweat" could exacerbate the impacts of the extreme heat blanketing a large portion of the U.S., ...

The extreme heat is prompting several warnings for the NYC area today, including a heat advisory and an air quality alert.

At least 100 Americans are on alert for dangerous heat and humidity -- stretching from Texas to Maine -- on Friday.

More than 100 million Americans are under heat alerts as the extreme temperatures that have smothered the Midwest this week ...

The combination of corn sweat, the exhalation of water vapor through leaves, and a heat dome is bringing dangerously hot ...

The Florida Panhandle didn't see the rain it expected to from the "tropical rainstorm," but did benefit from slightly cooler ...