Rich Instability Primed for Severe Storms Over Northeast SD, Central MN — SevereWX

Rich Instability Primed for Severe Storms Over Northeast SD, Central MN

An approaching front is setting the stage for strong to severe thunderstorms across northeast South Dakota and west-central into central Minnesota this evening. SPC's Mesoscale Discussion 1527 highlights increasing potential for development as early as 6-8 PM CDT, especially near the ND-SD-MN border and into northeast SD.

Surface conditions are primed: upper 80s temperatures with 70s dewpoints yielding 4000 J/kg MLCAPE and over 1.8 inches of precipitable water. Effective shear around 25 knots supports organized storms capable of isolated to scattered large hail (1.50-2.50 inches) and severe gusts (65-80 mph).

Model guidance points to initial storms firing in the southern part of nearby Severe Thunderstorm Watch #466, with additional activity possible farther southeast into west-central MN. While coverage remains uncertain, mesoscale factors are favorable for at least some severe outcomes through late evening.

SPC rates watch issuance at 60%, monitoring for escalation.

Stay prepared: Monitor local warnings, secure outdoor items, and have a severe weather plan ready if you're in the risk area tonight.