I don't think there was evidence that the tornado was moving at that types of low speed in Double Creek. Actually the stormed itself moved like 15mph based on radar.I've never heard anyone not agree that this was the most damage-intense tornado ever, and the slow ground speed absolutely played a role in that. As I understand it, at some parts of it's path it was moving at only 3-5 MPH; something like a fast walking or jogging pace. It moved faster after Double Creek but the 1-3 miles took much longer than what we normally see, so I can understand how the weakening would seem quick- only it really wasn't.