Fargo tornado

During the late afternoon and evening hours of June 20, 1957, a long-lived and deadly F5 tornado, commonly known as the Fargo tornado, struck the north side of Fargo, North Dakota, as well as the area north of Moorhead, Minnesota. It was part of a family of five devastating tornadoes produced by the same supercell thunderstorm over the course of 3.5 hours, although in National Weather Service records they are listed as one continuous tornado. The tornado family first developed in North Dakota and traveled 27.4 miles (44.1 km) to the Minnesota border before crossing it and continuing for another 25 miles (40 km), for a total track length of 52.4 miles (84.3 km), with the F5 Fargo tornado itself travelling a track length of approximately 9 miles (14 km). Additionally, at its widest point, the damage swath reached 500 yards (460 m) across.