National Weather Service United States Department of Commerce

The preliminary damage survey for the Grinnell tornado has been completed. Based on the damage surveyed, the tornado was rated an EF-3 with an estimated peak wind speed of 140 mph.
Breezy WNW winds are forecast to continue, albeit not as breezy as yesterday as winds gust around 30 mph. There is potential for an isolated strong to perhaps severe storms across the east this afternoon. Additional showers and storms may develop Thursday late afternoon as well.