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

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

The heat is no joke and this year, it's impacting a large portion of the U.S. Here's what to know about heat stroke, ...

An "extreme heat warning" has officially been issued for nine major U.S. cities on Monday, June 23. The National Weather ...

An "extreme" heat warning has been issued for 16 U.S. states on Tuesday morning. The National Weather Service is warning 16 U ...

The National Weather Service has extended the heat advisory for central Ohio until June 27. COTA has extended free rides as a ...

Philadelphia is under an extreme heat warning with heat index values up to 105 degrees, advising residents to stay cool and ...

The NWS has issued an extreme heat warning for central North Carolina, with heat index values possibly reaching 112 degrees, ...

It'll be very hot, but what conditions are required for the extreme heat warning that much of New Hampshire is under? Matt ...

We're hitting peak heat wave today, with a handful of Michigan counties forecast to be the hottest places in the state.

With New York under an extreme heat warning, the Mets took extra precautions Monday. Those included a later report time for ...

The National Weather Service is cautioning Tri-State residents about extreme heat early this week with heat indices that ...