At 1:01 PM EDT, Doppler radar was tracking a strong thunderstorm over Walkerton, or 12 miles northeast of Knox, moving northeast at 10 mph.
Radar indicated wind gusts up to 50 mph and nickel-sized hail. Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible.
Locations impacted include Walkerton, North Liberty, Koontz Lake, La Paz, and Teegarden.
