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.

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

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

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

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

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

Travel delays are mounting as airports on the east coast experience ground stops due to thunderstorms. Chicago streets were ...

Not only will Friday’s heat make for dangerous weather in terms of how it feels outside, but it is expected to fuel storms ...

New Jersey homes and businesses are without power. See latest updates from JCP&L, PSE&G, Atlantic City Electric and Rockland ...