SD MCS Already Gusting 70 MPH, 90 MPH Threat Builds for Minnesota-Iowa — SevereWX

A potent convective cluster racing eastward from southeast South Dakota has already unleashed severe gusts to 70 mph in Douglas County, with signs of further intensification as it bears down on southwest/south-central Minnesota and northwest/north-central Iowa.

The Storm Prediction Center's Mesoscale Discussion 1736 highlights the line's steady 35 kt motion, recent echo top increases, and prime conditions downstream: dewpoints in the upper 70s to low 80s paired with MLCAPE exceeding 3500 J/kg. This setup favors continued strengthening, bringing risks of damaging straight-line winds to 90 mph and isolated 1.25-inch hail through the overnight hours.

Peak threats include wind gusts of 75-90 mph, with the cluster expected to maintain its punch across these areas. A Severe Thunderstorm Watch is imminent at 95% probability to cover the hazards.

This evening's action stems from the persistent MCS, which has held together without much upscale growth but shows potential for severe impacts given the loaded environment.

Stay prepared: Monitor local warnings, secure outdoor items, and have a severe weather plan ready. Check radar updates and NOAA Weather Radio for the latest.