At about the same time a tornado was causing damage in Columbia County near Cambria in south-central Wisconsin, a thunderstorm was exhibiting rotation near Green Bay. The Green Bay storm did not produce any wind damage, even though it appeared menacing on radar.
The radar picture below shows the thunderstorm approaching Suamico in northwest Brown County, about seven miles northwest of the city of Green Bay. The left image is Doppler radar velocity, revealing moderate rotation (circled). The right image shows a classic "hook" echo which sometimes is associated with severe storms. (Click image for larger view.)
After the event, a storm survey was conducted across the northern part of Brown County. Not even a twig was found disturbed by the storm. Although the storm system that moved through Green Bay produced urban flooding, it did not produce any wind damage or tornadoes. Severe weather warnings were not issued for the storm, based on careful analysis by meteorologists during the event.