ND Supercells Ignite with 90 MPH Outflow Hammers, 3.5-Inch Hail Cores — SevereWX

ND Supercells Ignite with 90 MPH Outflow Hammers, 3.5-Inch Hail Cores

Storms bubbling up across southern North Dakota and northern South Dakota are deepening fast, primed to deliver a punch of severe weather this evening. The SPC's latest Mesoscale Discussion (1663) flags high-based convection already sparking isolated thunderstorms in Perkins and Meade Counties, SD, with more growth expected along a southeastward cold front.

A juiced-up environment—steep lapse rates from a modified Bismarck sounding, 30 knots of effective shear, and stretching hodographs—sets the stage for splitting supercells. These beasts could drop hail up to 3.5 inches (most probable 2-3.5 inches) and blast 75-90 mph wind gusts right out of the gate. Expect efficient cooling beneath to carve a cold pool, fueling upscale growth into damaging clusters as storms push east.

A Severe Thunderstorm Watch looks 80% likely soon to cover the action. Peak threats: significant hail and those brutal outflow winds capable of 80+ mph.

Residents from Bismarck south to the SD line, stay weather-aware. Have your severe weather plan ready—secure outdoors, seek shelter for hail/wind, and monitor updates from local NWS offices (FGF, ABR, BIS).

Track live radar and SPC graphics at www.spc.noaa.gov.