Mesoscale convective system produces strong winds, large hail and a few tornadoes across Nebraska and South Dakota
5-minute CONUS Sector GOES-19 (GOES-East) Infrared Window images (above) included plots of SPC Storm Reports — which showed severe thunderstorms that grew into a Mesoscale Convective System which produced wind gusts as high as 131 mph, hail as large as 2.75 inches in diameter and a few tornadoes from northwestern Nebraska to northeastern South Dakota during the overnight hours leading up to sunrise on 29 June 2026. More details about this event are available from NWS Aberdeen.
The coldest cloud-top infrared brightness temperatures were -80 C (violet pixels) — which represented a significant ~3 km overshoot of the Most Unstable (MU) air parcel’s Equilibrium Level (EL), according to a plot of rawinsonde data from Aberdeen, South Dakota (below).
