A rare November tornado occurred early this Monday evening, followed by snow Tuesday afternoon and evening in the same area. An outbreak of tornadic supercells occurred over western Kansas late Monday afternoon and evening. One of these supercells, with a history of producing at least one tornado, exited Kansas and crossed into eastern Furnas county around 7:30 pm CST. This storm produced an EF-1 tornado with a track nearly 13 miles in length over southeastern and east-central Furnas county. The storm ceased to be tornadic as a broken line of faster-moving thunderstorms caught up to and absorbed it. This was the first tornado for the Hastings County Warning Area since the EF-0 that occurred near Ayr on November 5, 2000. This was the first November tornado for the entire state of Nebraska since the Cass County EF-0 on November 17, 2003. About an hour after the storm merger occurred, this storm produced one inch hail a little west of Holdrege.
This storm, and all the other nearby tornadic storms, developed as lee cyclogenesis occurred and a warm front lifted north to the northwest Kansas-southwest Nebraska border. A cold front emerged from the Rockies and crossed south central Nebraska Monday night into Tuesday morning. This advected much colder temperatures into the region. As the 992 mb low emerged into Kansas during the day, a narrow band of snow developed around its northern and western periphery. The result was three to six inches of snow over portions of south central Nebraska, with the highest amounts over Dawson and Gosper counties.
Within the environment that produced the tornadic supercells, temperatures surged into the lower 70s, with dewpoints near 50. Mid-level lapse rates were poor which resulted in MUCAPE no greater than 500 J/kg. However, deep layer shear was 50-55 kts with 0-1 km SRH 250 m2/s2, more than sufficient for rotating storms and tornadoes. In the upper-levels, a trough was over the western United States Monday, with a ridge over the East. A closed low was in the base of the trough and was advancing through the Desert Southwest. This low then tracked across the Texas and Oklahoma panhandles and into southern Kansas Tuesday. By daybreak Wednesday, this low was near Topeka. This was a strong system with the surface low as deep as 989 mb. By Wednesday morning, the upper-level jet streak that rotated around the base of the low had intensified to 150 kts.