The Marion, Illinois tornado touched down near Carterville, Illinois, at 3:00 p.m. resulting in damage to a subdivision near John A. Logan College. The tornado then tracked into downtown Carterville then tracked southeast into Crainville, Illinois, after which it caused moderate damage to the area surrounding Williamson County Regional Airport. At 3:16 p.m. the tornado either formed a new funnel or changed course as it tracked into the west side of Marion along Illinois Route 13 causing extensive damage throughout the city. During this time the tornado was observed as a multiple-vortex tornado with up to three smaller tornadoes swirling around the main tornado. The tornado struck a car along Interstate 57, causing it to explode. By 3:30 p.m. the tornado had exited the city and dissipated near Illinois Route 166. The tornado had destroyed the Shawnee Village Apartment Complex and severely damaged three shopping centers. The tornado heavily damaged the area surrounding the Interstate 57 and Illinois Route 13 interchange including the Marion Ford dealership. The tornado also damaged two schools, 648 homes, and 52 businesses. The tornado caused 10 deaths, 181 injuries, and in excess of 1,000 people homeless.