Officials warn of health risks as massive weather system traps sweltering air.

The National Weather Service called the forecast for above-average temperatures "the first significant heat wave this season.

The first heat wave of summer could bring punishing humidity and triple-digit temperatures to many states east of the Rocky ...

Friday is the summer solstice and much of the U.S. is going to be baking in serious heat starting this weekend with a heat dome expected to keep temperatures soaring. Stephanie Sy reports on what you ...

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