What's the worst storm you have been in while camping?

The worst we have been in was at Big Mac in Nebr. We were on the lake in the boat when a storm blew up. We got the boat loaded and headed for camp but didn't make it and had to stop along the road in a low spot. When we got to the camper afterwards one of the support arms for our awning was driven right through the roof and the camper had been moved about a foot sideways. We found out that a tornado had passed about a half mile from the campground.