As a heat wave hits multiple U.S. states, some areas are have been placed under extreme heat watches and warnings.

A family of 11, including six children, was rescued off the Holbert Trail on South Mountain in Phoenix during a hot summer ...

Each local National Weather Service office issues 3 different heat alerts to classify the appropriate level of risk posed by ...

Both alerts mean it’s dangerously hot. Both are signals to take immediate action to protect yourself from heat-related illnesses like heat exhaustion and heat stroke. Criteria can be lowered if it's ...

Central Park last had a 100-degree day on July 18, 2012, and hasn’t seen a triple-digit temperature in June since 1952.