Dakota Border Supercells Surge with 90 MPH Winds, 3.5-Inch Hail Cores — SevereWX

Dakota Border Supercells Surge with 90 MPH Winds, 3.5-Inch Hail Cores

Storms are kicking off along the southern North Dakota and northern South Dakota border, turning into high-based supercells that could hammer the region with severe weather this evening.

SPC's Mesoscale Discussion 1663 highlights a cumulus field in far southwestern ND and northwestern SD already sparking isolated thunderstorms in Perkins and Meade Counties. Expect more growth along a southeastward-moving cold front, fueled by steep lapse rates, 30 knots of shear, and elongating hodographs as upper winds strengthen.

These setups favor splitting supercells producing large hail up to 2-3.5 inches—think golf balls or bigger—and damaging winds to 75-90 mph, with some gusts pushing significant territory. Evaporative cooling will build a cold pool, leading to upscale growth into clusters that shift the main threat toward brutal outflow winds as storms race east.

A Severe Thunderstorm Watch is 80% likely from 4-7 PM CDT to cover this stretch. Peak threats: 75-90 mph gusts, 2-3.5 inch hail.

Keep eyes on the sky if you're in the area—storms could intensify quickly. Check SPC for updates and graphics.

Stay prepared: Secure outdoor items, have a severe weather plan, and monitor local warnings via NOAA radio or apps. Safety first as these beasts evolve.