- SouthDakotahad35tornadoesin2009,andispartof"tornadoAlley,"anareaoftheMidwestUnitedStatesthatseesmoretornadoesthantherestofthecountry.Supercellthunderstormsareknowntospawntornadoeswithwindsexceeding200milesanhour(322kilometersanhour).Mobilehomesaren...
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