Heat advisories are issued as an early-season heat wave drives record temperatures across the Northeast, raising illness risk.

As a rare March heat wave pushes temperatures toward record highs across Southern California, health officials are warning beachgoers to stay out of the ocean at several popular Los Angeles County ...

A long-duration heat wave is taking shape over the western half of the U.S. and is forecast to stick around in the days ahead. A high-pressure system in place over the West is keeping precipitation ...