Between 730-815 pm CDT on this Saturday evening, a severe multicell storm tracked northeast through western portions of Dawson County, pelting areas in and near Gothenburg with large hail ranging from quarter to baseball size. In Gothenburg itself, hail up to golf ball size was reported, with the baseball size report originating seven miles northeast of town before the storm slipped out of the local area into Custer County. This hail storm was by far the most notable of a handful of multicell storms that affected western portions of South Central Nebraska mainly between 730-1030 pm CDT. Prior to entering the local area, the initial development of strong to severe convection took place during the mid-late afternoon hours near the Nebraska-Kansas-Colorado border before tracking east-northeast. After darkness fell, the South Central Nebraska storms steadily faded away, as most activity ended up confined to Dawson, Gosper, Furnas, Harlan and Sherman counties.
On the large scale aloft, this event occurred under fairly modest quasi-zonal flow, as South Central Nebraska remained well-removed from stronger flow associated with broad longwave troughs centered near both the northwest and northeast corners of the United States. However, the presence of subtle, low-amplitude shortwave troughs passing through the flow helped ignite strong to severe convection in an environment featuring steep low to mid level lapse rates, around 2500 J/kg mixed-layer CAPE, and around 35 knots of 0-6 kilometer deep layer wind shear. At the surface, late afternoon and evening dewpoints in the Dawson County area averaged in the low-mid 60s, as steady south-southeast breezes prevailed to the east of a High Plains lee trough and south of a synoptic warm front aligned from western South Dakota into far eastern Nebraska.