Heat is the number one killer -- and it’s heading to the most densely populated part of America for a prolonged period.

The National Weather Service called the warm and above-average temperatures coming in behind the system "the first ...

A Midwest heat dome is driving high temperatures and high humidity that will push the Chicago heat index into the triple ...

States in the Midwest and Northeast will face high temperatures in the coming days during the summer’s first “dangerous” heat ...

Widespread 90s, even perhaps a few 100s, will bake much of the eastern two-thirds of the country in a dangerous heat wave.

A “significant and extremely dangerous heat wave” is expected to send temperatures soaring across much of the United States ...

Heat dome will cause dangerously high temperatures in many places across the country this weekend, especially the Midwest and ...

Maps show where extreme humidity and 90- or 100-degree temperatures will affect around 255 million people across the United ...

A heat wave will bring the highest temperatures of the year so far, with some areas possibly reaching triple digits, ...

The first heat wave of the summer is expected to set up later this week and last into the following week for much of the ...

Just in time for the start of summer on June 20, a heat wave is expected to scorch a large section of the United States, ...

As a major heat wave builds and takes center stage in the weather from late this week to next week, groups of severe ...