six tornadoes spawned by storm six tornadoes were spawned by this storm including an f tornado in flat rock michigan i don't really know if the tornadoes were actually spawned by the derecho i know that on july a derecho spawned ten tornadoes maximum f strength in eau claire wisconsin and the new york city labor day derecho spawned four tornadoes including an f in lynbrook new york so i don't see how the tornadoes wouldn't have been associated with this storm