Plains Heat Wave Primes 80 MPH Gusts in Nebraska-South Dakota — SevereWX

A blistering surface trough is fueling convective development across parts of western and central Nebraska into southeast South Dakota this evening.

Cumulus clouds are building rapidly in an environment primed for severity: temperatures soaring above 100°F, rich low-level moisture, and steep lapse rates yielding MLCAPE values from 2000 J/kg in west-central Nebraska to over 4000 J/kg farther north. Veering winds provide 30-40 kt of effective shear, enough for organized storms if they can root.

While large-scale lift is weak—leaving timing and coverage uncertain—SPC expects at least isolated severe storms by early evening along the boundary. The primary hazard will be damaging straight-line winds of 60-80 mph (most probable 65-80 mph) in this steep low-level lapse rate setup. A supercell or two could also produce 1-1.75 inch hail.

Watch issuance is possible within the hour to cover these threats, valid through around 8 PM CDT.

Key Threats:

Monitor radar closely as storms initiate. Have a severe weather plan ready—secure outdoor items, seek shelter if storms approach, and stay tuned to local NWS updates.