I was over at Crystal River and saw a company that sells tornado shelters since no one here has basements. The shelter is a concrete septic tank that you put in your garage (or behind your double-wide). They are modified from the "garden variety" septic tank in that the top is covered and there is an entrance (exit?) hatch on the side. They definitely would be heavy enough to withstand all but a direct hit - but getting into a septic tank - I don't know about that!
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