Strong storms passing through western Iowa early this (Thursday) morning have caused damage in some locations. The National Weather Service in Des Moines says a trained spotter in Audubon reported winds gusting up to 60-miles per hour caused large tree branches to snap and fall four-miles east of the Audubon Airport, and some shingles were blown off a roof. A severe thunderstorm warning was issued for parts of Audubon, Cass, Adair and Guthrie Counties, just before 6-a.m.