The Tornado outbreak of May 1968 was a significant and deadly tornado outbreak that struck most of the central and southern United States from May 15 to May 16, 1968. Producing 46 tornadoes, the outbreak killed at least 72 people, including 45 in Arkansas alone. The outbreak also produced two F5 tornadoes in Iowa. It was one of the deadliest tornado outbreaks in the United States since the 1960s and is one of the deadliest outbreaks in Iowa history.