The June 1990 Lower Ohio Valley tornado outbreak was a tornado outbreak that occurred in southern Illinois, central and southern Indiana, southwestern Ohio, and northern Kentucky on June 2–3, 1990. By the end of the outbreak, 66 tornadoes had struck the Ohio River Valley, including seven of F4 intensity. 37 tornadoes occurred in Indiana, a record for a single day that eclipsed the previous record of 21 set during the Super Outbreak on April 3, 1974.

• http://en.wikipedia.org/wiki/June 1990 Lower Ohio Valley tornado outbreak