An "extremely dangerous heat wave" is continuing to scorch a huge area of the eastern United States June 23, affecting tens of millions of people.

Tens of millions of people across the Midwest and East are enduring another sweltering day of dangerously hot temperatures as a sprawling June heat wave grips much of the U.S.

Tens of millions of people across the Midwest and Mid-Atlantic are under heat alerts Monday as a dangerous heat wave that began over the weekend continues to move through the region.