Six tornadoes spawned by storm Six tornadoes were spawned by this storm including an F3 tornado in Flat Rock Michigan I don t really know if the tornadoes were actually spawned by the derecho I know that on July 15 1980 a derecho spawned ten tornadoes maximum F3 strength in Eau Claire Wisconsin and the New York City Labor Day Derecho spawned four tornadoes including an F2 in Lynbrook New York So I don t see how the tornadoes wouldn t have been associated with this storm