40-Knot Shear Supercharges Nebraska Supercells for Large Hail, Severe Winds — SevereWX

Thunderstorms are firing up along a line of moderate instability stretching from northwest Nebraska into southwest South Dakota, driven by a mid-level shortwave trough visible on satellite imagery.

Large-scale ascent is boosting convective coverage, expected to ramp up over the next few hours. The Rapid City radar's vertical wind profile shows impressive 0-6 km shear near 40 knots, paired with steep low- to mid-level lapse rates. This setup favors supercells capable of isolated large hail to 2.5 inches and severe wind gusts to 80 mph.

Shorter line segments could also pack damaging downdrafts. Meanwhile, ongoing storms in far southeast Wyoming are holding together, tracking east into western Nebraska where stronger cells may produce similar hazards.

SPC's Mesoscale Discussion #1473 flags a 60% chance of watch issuance within the next two hours for northwest and north-central Nebraska. Peak threats include hail 1.50-2.50 inches, winds 65-80 mph, and low-end tornadoes to 90 mph.

Stay alert this evening—monitor radar and local NWS updates closely.

Prepare now: Review your severe weather plan, secure outdoor items, and know your safe shelter spot. Have multiple alert sources ready.