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Clusters of thunderstorms produce large hail and strong winds across South Dakota

By Scott Bachmeier •

1-minute GOES-19 Visible images with time-matched plots of SPC Storm Reports, from 000 UTC on 25 July to 0150 UTC on 26 July

1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Visible images (above/) and Infrared Window images (below) showed clusters of thunderstorms that produced hail as large as 2.50″ in diameter and wind gusts as high as 92 mph (SPC Storm Reports) across parts of South Dakota on 25 July 2026.

1-minute GOES-19 Infrared Window images with time-matched plots of SPC Storm Reports, from 2000 UTC on 25 July to 0302 UTC on 26 July

Pulses of overshooting tops exhibited infrared brightness temperatures as cold as -83 C — which represented a significant overshoot of the Most Unstable air parcel’s Equilibrium Level, according to a plot of rawinsonde data from Aberdeen, South Dakota (below).

Categories: GOES-19, Severe convection