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

The new map displays the potential impact of a large-scale nuclear attack on the United States, with 250 million immediate deaths predicted.

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 ...

Another round of showers and thunderstorms moved across the Mid-Atlantic Tuesday after intense rain set off dangerous flash ...

Scientists say a new epicenter is forming for the deadliest storm zone in the U.S. Here’s where people are now most at risk ...

Days of tornadoes, damaging winds, large hail expected in central states. An active severe weather pattern will target the northern Plains, Upper Midwest and Mid-Atlantic.

The map embeds below identify areas where the heat index is forecasted to reach NWS-defined levels from "Caution" (80 degrees Fahrenheit) to "Extreme Danger" (above 125 degrees). More in U.S.