Yeah I watched Micheal Phelps, who does StormscapeLive, last year doing a tour of one of his first ever chases. Off the top of my head it was the Andover F5 1991 event. But it hit a mobile home park, which I gather are quite common in the US. The storm shelter they had built there could only fit around half the people who lived there in it. And even now years after, the same park still has the same storm shelter and the same would happen again should another tornado come tearing through. Would not like to live out there without a shelter of some form. Seems its quite common though still. After some brain bashing and googling and google maps/streetview, it was the Andover F5. This little shelter for some many people http://g.co/maps/23sfw