Below is a link to information about the number of tornados near Rolla with a chart of frequency and number of deaths and injuries.

https://docs.google.com/spreadsheet/ccc?key=0ArrVIKfXU9TndEl5UE5vN1JIc1hUVkF6T0FMM1dCOFE&usp=sharing

Information gathered from www.homefacts.com
(Contributed by John Lewis Koenig)