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 Mid-Atlantic are under heat alerts Monday as a dangerous heat wave that began over the weekend continues to move through the region.

The official heat wave will begin today, following yesterday's fall just below the 90-degree mark, thanks to the spotty storms. Expect Monday to approach 100 degrees in many areas across the Delaware Valley,