March 13, 1990: A devastating tornado outbreak brought a total of 59 confirmed tornadoes across Oklahoma, Kansas, Nebraska, and Iowa (See Figure 1 Below). The tornado outbreak brought two F5 tornadoes and two F4 tornadoes across the central United States (See Table Below). One of the F5 tornadoes was the historic Hesston, Kansas tornado. Across Iowa, multiple severe thunderstorms swept across the state and produced at least 14 tornadoes, including an F4 which struck areas around Prairieburg and Worthington, Iowa and an F2 which injured 15 people and produced 6 million dollars in damage in and around Ankeny, Iowa. Hail reports ranged up to golf ball size near Elvira and wind gusts in excess of 75 mph were reported around Little Sioux and Logan. This was part of a wild stretch of weather in early to mid March of 1990 that saw a significant ice storm followed by several severe weather and tornado outbreaks then a big snow storm, all in a nine day stretch!
Figure 1: March 13, 1990 Tornado Outbreak.
https://www.weather.gov/oun/events-19900313
https://www.weather.gov/ict/hesston
https://www.weather.gov/gid/48406
http://www.crh.noaa.gov/Image/ict/hesston/hesston_nws.pdf