On this day in 2004, a brief but extremely violent tornado struck near Harper, KS. The F4 tornado had a path length of only one mile. It produced near-F5 damage as a large farmhouse simply vanished, several vehicles were shredded, trees were completely debarked, and the ground was scoured. One person was injured in the basement of the farmhouse that vanished when debris, including two debarked trees, was thrown into it. Source.