Supercells Surge in Central South Dakota, Threatening Northern Nebraska with Hail and Winds — SevereWX

Thunderstorms are picking up steam across central South Dakota this afternoon, fueled by clearing skies, heating into the 80s F, and dewpoints in the upper 60s to 70s F. This combo is sparking moderate instability with MLCAPE of 1000-2000 J/kg, paired with 20-30 kt deep-layer shear and veering winds—prime ingredients for supercell storms.

The Storm Prediction Center's Mesoscale Discussion 1802 highlights these storms strengthening near a zone of mid-level ascent spreading over the central and northern Plains. Initial supercells could pack large hail up to 1.25 inches and damaging winds of 55-70 mph, with a low-end tornado risk up to 90 mph peak intensity. As the afternoon progresses into evening, storms may cluster, ramping up the wind threat further.

SPC pegs the odds of a Severe Thunderstorm Watch at 80% for central South Dakota into northern Nebraska, valid through around 8 PM CDT. Keep an eye on this rapidly evolving setup, especially if you're in the path from Pierre eastward across I-90, then south toward the Nebraska Panhandle.

Key Threats:

Storms are already underway—stay tuned to radar and local NWS updates as watch potential builds.

Preparedness Tip: Have a severe weather plan ready—secure outdoor items, monitor via NOAA Weather Radio or apps, and know your safe shelter spot indoors away from windows.