There are a bunch of really interesting Wisconsin events, especially from the mid-1800s to the mid-1900s. One of my favorites is a pretty complex outbreak on July 3, 1907 that I really need to dig into deeper eventually. There were five significant tornadoes officially (w/three F4s), but that's probably an undercount. Several major tornadoes were on the ground simultaneously at some points.
The first tornado(es) tore a short-ish path through the Tioga and Neillsville areas, causing F4 damage:
The second F4 (probably a family) started southwest of the first and traveled nearly 60 miles, killing 11 people and causing violent damage near Hatfield, Oakdale and Elroy: