Get ready for a significant shift in temperatures across the United States! After a period of extreme heat, much of the central and eastern U.S. will experience a welcome change as cooler air ushers in fall-like conditions later this week. States spanning from Michigan to Mississippi are expected to see high temperatures drop by as much as 20 degrees, offering a much-needed respite from the sweltering heat. This refreshing change isn't limited to the Midwest and South; cooler conditions are also anticipated to extend westward into Wyoming and eastward along the East Coast.