Day 4: Prolonged, dangerous heat continues with heat index values near historic levels once again. For information on cooling centers in Missouri: https://t.co/weo6DqUYGL and in Illinois: https://t.co/tb25te0YDN #stlwx #ilwx #mowx pic.twitter.com/vPJ9WhqSAf

— NWS St. Louis (@NWSStLouis) August 23, 2023