Blazing Trough Ignites 80 MPH Gust Threat Across Nebraska-South Dakota — SevereWX

Blazing Trough Ignites 80 MPH Gust Threat Across Nebraska-South Dakota

A potent mix of triple-digit heat and sky-high instability is priming isolated thunderstorms for severe outbursts across parts of western and central Nebraska into southeast South Dakota this evening.

The Storm Prediction Center's Mesoscale Discussion 1747 highlights cumulus fields bubbling up along a surface trough where temperatures have soared above 100°F. Low-level moisture and steep lapse rates are fueling MLCAPE values from 2000 J/kg in west-central Nebraska to over 4000 J/kg farther north. Add in veering winds and 30-40 kt effective shear, and any storms that ignite could pack a punch.

Timing and coverage are tricky amid weak large-scale lift, but SPC forecasters expect at least some storms to roar to life by early evening near this boundary. The primary menace: straight-line winds of 65-80 mph in the steep low-level lapse rate setup. A supercell or two could also drop hail up to 1.75 inches.

Watch issuance odds sit at 60%, with a decision possible soon. This setup echoes recent Plains volatility but stands out for its raw thermodynamic punch.

Stay prepared: Monitor radar closely, secure outdoor items, and have a severe weather plan ready. Alerts could ramp up quickly—check local NWS offices for FSD, OAX, and ABR.