The Charles City tornado is listed as having a 65 mile path length, however it was actually the second of probably three tornadoes produced by the same supercell. The F5 tornado entered Charles City shortly before 5PM and caused extensive damage through the entire city. At about the same time a second F5 tornado hit Oelwein located 40 miles to the SE. The Oelwein tornado moved NE and hit Maynard sweeping homes completely away. The Oelwein supercell also produced more than one tornado. Many farms were severely damaged or in some cases totally swept away by both tornadoes. The two F5's killed 18 people and injured more than 600. The thunderstorms formed on a wind shift line ahead of the cold front. There had been severe thunderstorms during the morning hours along the warm front (baseball size hail at 10AM in Iowa City) it appears the thunderstorms interacted with an outflow boundary from the morning convection. The tornadoes were part of a larger outbreak that affected several states.