About half the country is under active heat advisories again on Tuesday, affecting more than 168 million Americans, according ...

The storms could be accompanied by hail or damaging winds and have the highest chance of forming on Tuesday evening.

Multiple states are under extreme heat warnings, advisories or watches on July 23, according to the National Weather Service.

A heat dome​ is trapping over 90 million Americans in extreme temperatures this week with the National Weather Service​ ...

Here's everything you need to know about the heat wave. 'Rare' and 'dangerous': Record-smashing heat wave to scorch tens of millions. National heat index map: See which states feel hottest The map ...

For at least half a century, the National Weather Service has been an around-the-clock operation. That is no longer possible in parts of the country.

He says it can help find narrow layers that are dry or wet or warm and cold, which play a role in severe thunderstorms forming. The NWS launches weather balloons at around 92 sites in the U.S. The ...