Unusually hot, in some cases setting record highs, has settled across the central and southeast U.S.
Heat Index levels will near 100 degrees in many livestock production areas including Texas, Oklahoma, Missouri, Arkansas, Kentucky, and Tennessee.
On the other hand, much cooler air has moved into the western U.S. Freezing temperatures are expected over the Northern Plains.
Heavy rain has fallen, in spots 3 inches or more, along the boundary between the cool and hot airmasses.
The good news is that a cold front will sweep through the rest of this week spreading cooler air across the middle of the nation.