Scouting Tornadoes (IMAGE) Iowa State University Caption Christopher Karstens studied the storm damage in Alabama valleys running perpendicular to the path taken by the April 2011 Tuscaloosa-Birmingham tornado. Credit Photo courtesy of Christopher Karstens/Iowa State University. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.