The sprawling heat dome will shift its focus to the Southern and Central Plains this week, bringing summer-like heat back to the region. Temperatures will approach triple digits for nearly 30 million people by midweek.
Temperatures could climb 10 to 15 degrees above average for early September, while humidity pushes heat index values to 105 degrees or higher across parts of the eastern Plains and Heartland, including Oklahoma, Arkansas, Missouri and Mississippi…