The National Weather Service has rated the tornado that passed through Grinnell on Sunday an EF-3 with an estimated peak wind speed of 140 mph. The NWS uses a rating scale known as the Enhanced Fujita Scale (EF Scale) to assign tornado ratings.

The National Weather Service in Goodland has rated the powerful storm that heavily damaged much of the town of Grinnell in Gove County Sunday night as an EF3 tornado. The NWS said the tornado hit the town with an estimated peak wind speed of 140 miles per hour.