The U.S. Air Force Thunderbirds perform at the annual Chicago Air and Water Show, Sunday, Aug. 20, 2023, in Chicago, as boaters crowd along the shore of Lake Michigan. The National Weather Service set an excessive heat warning Sunday for parts of Texas, Louisiana, Arkansas, Oklahoma, Kansas, Missouri, Illinois, Iowa and Nebraska. Heat advisories or watches were also in place in parts of Alabama, Mississippi, Tennessee, Kentucky, Indiana, Wisconsin, Minnesota and South Dakota. (AP Photo/Kiichiro Sato)