To the left are the paths of tornadoes over the years in the Moore, Oklahoma area.
Red: May 3rd, 1999 Tornado Path
Blue: May 8th, 2003 Tornado Path
Green: May 20th, 2013 Tornado Path
You can see how a portion of the 2013 storm (green) overlaps the 1999 storm (red), which was an F5 tornado that did around 1.1 billion dollars in damage. 36 people died in that storm and 8,000 homes were badly damaged or destroyed.