Frontal Wave Amplifies Supercell Hail, Tornado Threat in Minnesota-North Dakota — SevereWX

A developing frontal wave is set to sharpen the severe weather setup across north central and west central Minnesota into southeastern North Dakota this evening.

The SPC's Mesoscale Discussion 1829 highlights a stalled but strengthening low-level baroclinic zone as the key focus. By 7-9 PM CDT, thunderstorms could ignite and organize into supercells beneath steep mid-level lapse rates from a warm elevated mixed layer. Rapid Refresh models show a narrow corridor of moderate instability aligning with a 30-40 kt south-southwesterly 850 mb jet and 50-70 kt west-southwesterly 500 mb flow.

Even if stronger storms form on the cool side of the boundary or get undercut, thermodynamic profiles should still support large hail up to 1.75 inches, wind gusts of 55-70 mph, and tornadoes up to 90 mph (EF2 intensity) through midnight. The watch issuance probability sits at 60%, signaling confidence in escalating threats.

Residents in this region should monitor updates closely as convection ramps up into the evening. The setup favors discrete supercells initially, but upscale growth remains possible.

Stay prepared: Review your severe weather plan, ensure mobile alerts are enabled, and seek shelter if warnings are issued. Check radar frequently tonight.