May 21, 1918: A possible F5 tornado crossed 37 miles through parts of Crawford, Carroll and Greene Counties in Iowa. “Twenty or more farms were devastated, and debris was carried for miles.” Near Carroll, a couple died in their home. “Another couple were caught in a buggy racing home, north of Churdan, and was killed.” Grazulis denotes that mattresses were carried two miles and “foundation of homes and barns were left bare.”