SD MCS Powers Up for 90 MPH Winds, Hail in Minnesota-Iowa — SevereWX

A potent mesoscale convective system (MCS) is barreling eastward from southeast South Dakota, primed to unleash severe weather across southwest and south-central Minnesota, plus northwest and north-central Iowa.

The Storm Prediction Center (SPC) highlights this ongoing cluster moving at around 35 knots, with recent echo tops surging near its core—signaling potential intensification. Already, gusts to 70 mph have hammered Douglas County, SD, and downstream conditions are ripe for escalation.

Low-level dewpoints in the upper 70s to low 80s meet extreme instability, with MLCAPE exceeding 3500 J/kg. This combo fuels a high risk of damaging straight-line winds up to 90 mph, alongside isolated 1-1.25-inch hail. SPC pegs the odds of a Severe Thunderstorm Watch at 95% to cover the action through about 2:45 AM CDT.

Peak threats include wind gusts of 75-90 mph, making this a public safety concern for evening commuters and residents in the Twin Cities metro fringe, Mankato, and Mason City areas.

Stay prepared: Monitor local NWS updates, have a severe weather plan, secure outdoor items, and seek shelter if storms approach. Check radar frequently this evening.