Between 1130 PM CDT on Wednesday the 27th and 3 AM CDT early Thursday morning the 28th, a small complex of strong to severe wind-producing thunderstorms pushed northeast across southeastern portions of South Central Nebraska, primarily affecting counties such as Webster, Franklin, Nuckolls, Clay and southern Adams. Although storm and damage reports were limited, winds of at least 55-60 MPH were reported in the Red Cloud and Blue Hill areas, with tree damage in Blue Hill. Although significant flooding issues were averted by the progressive nature of the strongest storm cores, overnight rainfall still tallied 1.5 to over 2 inches in a few spots, including 2.3 inches a few miles northeast of Blue Hill.
Aloft, the mid and upper levels featured a typical mid-summer pattern, with South Central Nebraska positioned within the interface between a sprawling ridge across the southern states, and the primary jet stream and associated faster flow aloft across the Dakotas. The storm complex that eventually rolled into the area first evolved from a smattering of multicell storms that initiated during the late afternoon and early evening hours in central and northwest Kansas, in an environment characterized by steep low-level lapse rates and high cloud bases. As the evening wore on, these initial storms started to developed organized cold pools and push northeast across north central Kansas and into the local area, aided by convergence along a modest low level jet and weak frontal zone evident at 850 millibars. These storms already had a history of producing wind gusts of 70-80 MPH across northern Kansas before they crossed the state line. After affecting the Red Cloud and Blue Hill areas, the storm complex weakened as it pushed northeast, and although additional rounds of thunderstorms affected parts of South Central Nebraska through the night they remained sub-severe. Mesoscale severe weather parameters around midnight CDT included approximately 2500 J/kg mixed-layer CAPE, but only around 30 knots of deep-layer vertical wind shear.