Two brief tornadoes occurred in Harlan County on this Saturday evening, with a couple reports of severe hail as well nearby. Scattered thunderstorms developed over north central Kansas between 530 and 600 p.m. CST. Several small thunderstorms lifted north, into and through Harlan County, over the following two hours. The last storm to move through produced a couple brief, weak tornadoes around 730 p.m. CST. This storm also produced one inch hail in a couple locations over Phelps County, just after 8 p.m. CST. Other small thunderstorms continued across south central Nebraska, and just before 11 p.m., a storm briefly became strong enough to produce a few one inch hailstones in Kearney. However, most of the hail was the size of nickels or smaller.
A continental polar air mass was over the region, but lee cyclogenesis was underway. By midnight, low pressure had migrated from northwestern Kansas and into south central Nebraska. The associated warm front had also lifted north along with it. At upper-levels, a deep trough was over the Rockies with a closed low over Colorado, and a coupled jet streak configuration. A ridge was downstream over the eastern United States. South central Nebraska had been shrouded in low stratus and fog all day, with temperatures struggling to rise through the 50s. Dewpoints depressions were very low. MUCAPE was only 500 J/kg, but deep layer shear was around 45 knots. Strengthening and significantly veering low-level wind fields resulted in 0-1 km SRH of 200-300 m2/s2.