Extreme Buoyancy Supercharges SD MCS for 90 MPH Minnesota-Iowa Winds — SevereWX

Extreme Buoyancy Supercharges SD MCS for 90 MPH Minnesota-Iowa Winds

A robust convective cluster racing eastward from southeast South Dakota at 35 knots poses a serious severe weather risk this evening. Already producing gusts to 70 mph in Douglas County, the line shows signs of strengthening, with recent echo tops surging near its core.

Downstream conditions are primed for escalation: dewpoints in the upper 70s to low 80s combine with MLCAPE exceeding 3500 J/kg, fueling extreme buoyancy. Forecasters at the Storm Prediction Center expect this to yield severe wind gusts up to 90 mph, plus isolated 1-1.25 inch hail, across southwest/south-central Minnesota and northwest/north-central Iowa through around 12:45 AM CDT.

A Severe Thunderstorm Watch is 95% likely to cover the hazards, highlighting the confidence in ongoing threats. While motion remains steady, the system's potential for further upscale growth keeps impacts probable.

Peak Threats:

Stay weather-aware if in the path—monitor radar and have a plan for damaging winds. Secure outdoor items, avoid travel under storms, and seek shelter if warnings hit. Check SPC for updates.