Originally Posted By: dweste
I wonder if we had a threat map, like the 100-year flood maps, that included hurricane, tornado, flood, whatever, how much of the country -if any - would be free of such threats?

Probably not much with tornadoes included. Hurricanes and floods cause damage on a large scale and it's fairly easy to predict where they are most likely to occur. A tornado, while very severe, is much more limited in the amount of geography that it covers.