Forecasters are warning of dangerous heat, humidity and health risks through early next week.

A heat wave will blast much of the eastern U.S. this week, and forecasters say temperatures will feel even hotter because of the high humidity that's arriving with it.

States with areas under a “major” or “extreme” heat warning July 15 include Arizona, California, Colorado, Connecticut, ...

A second heat dome of the summer is locking down over the western and central United States this weekend, and the desert road ...

Here's a primer on the guidelines for heat warnings and what they mean, in the words of the National Weather Service.