I am not from tornado country, and quite frankly, they scare the hell outta me. It took me forever to get over the almost daily waterspouts I saw coming at me across the Bay of Panama long ago. But I gotta think that building a tornado proof shelter in your basement might well find you trapped in said shelter by what used to be your home. If I had one of those basement things, I would make sure that A LOT of friendly folks knew about it, so they could come dig me out...