Most of the U.S. is about to swelter under an unusually large, strong and long-lasting heat dome. The heat wave is set to ...

Heat alerts were issued for millions across parts of the western U.S. Sunday due to an unusually prolonged heat dome, which ...

A widespread and dangerous heat wave is building across the U.S., with triple-digit highs expected in the Southwest and Great ...

More than 160 million people are under extreme heat warnings or heat advisories ahead of the Fourth of July weekend.

A dangerous heat wave​ arrives in Philadelphia and the surrounding suburbs this week, where each day temps could surpass 100 degrees.