Over 140 million Americans will be under the highest-level extreme heat alerts by Sunday during a wave of above-average ...

More than 37 million Americans are under heat advisories across the U.S., according to the National Weather Service. Here's ...

Extreme humidity and heat will affect around 265 million people across the country this week. Maps show where and when to ...

A dangerous, record-breaking heat wave will spread over the eastern United States and is expected to last several days.

A significant and intense heat wave is set to engulf the central and eastern United States, delivering the highest ...

Much of the country is facing brutal, potentially deadly heat. The reasons for such extreme events are not complicated.

The first heat wave of summer could bring punishing humidity and triple-digit temperatures to many states east of the Rocky ...

Maps show where extreme humidity and 90- or 100-degree temperatures will affect about 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, ...

Many places around the country will experience their first significant heat of the year in the next few days. Here’s why it’s ...

A "dangerous" heat wave has begun in parts of the United States — and high temperatures are expected to move eastward over ...

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, ...