Much of the U.S. is under extreme heat warnings or advisories while New York, Philadelphia and Washington could feel like 100 degrees or more.

At least 100 Americans are on alert for dangerous heat and humidity -- stretching from Texas to Maine -- on Friday.

Major cities under heat alerts include New Orleans, Memphis, Little Rock, St. Louis, Kansas City, Chicago and Minneapolis.

The heat dome won't dissipate soon. Dangerous heat is expected across parts of the Central and Southeast. through July, the weather service says. High temperatures will reach 100 degrees from Texas to ...

Numerous states could see heat index values higher than those expected in Death Valley on Thursday, according to the NWS.

In the U.S., hundreds of people succumb to heat-related illnesses each year. Older adults and people in areas that historically haven’t needed air conditioning tend to see the highest rates of ...

A heat dome happens when hot air is trapped over an area due to a persistent high pressure system, William Gallus, a ...

The risks of heat are only growing thanks to lasting heat waves, extreme nighttime temperatures and unusual humidity, like ...

Nearly a third of the United States is under heat alerts as temperatures skyrocket, prompting an experimental tool to help ...