More than 160 million Americans are under the highest level of extreme heat alerts during a wave of above-average ...

A heat wave is currently affecting about 160 million people, according to the National Weather Service. Here's which states ...

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

"Dangerous heat will intensify across much of the Northeast and Mid-Atlantic early this week," meteorologist Jacob Hinson said.