DVN has rated the tor in their western cwa as an EF4...
After collaboration with a team of survey experts, we have determined a prelim. rating of low end EF4 for the tornado that tracked from Wapello into Johnson County IA. Max estimated winds around 170 mph. Max width around 600 yards. The EF4 damage occurred at a farmstead N/NE of Keota in Keokuk County, where a house was swept off the foundation. We are still finalizing additional details.