Mid-Level Ascent Ignites Supercells Over Central SD, Northern NE — SevereWX

Thunderstorms are firing up across central South Dakota amid rising mid-level ascent over the central and northern Plains. As morning clouds clear, surface heating is pushing temperatures into the 80s F with dewpoints in the upper 60s to 70s F. This combo is fueling moderate instability, with MLCAPE of 1000-2000 J/kg.

Deep-layer shear of 20-30 knots and veering wind profiles favor supercell structures initially, setting the stage for large hail up to 1.25 inches and damaging winds of 55-70 mph. Tornado potential exists, with peak intensities possibly reaching 90 mph. Storms may cluster later, amplifying wind threats into the evening.

SPC's Mesoscale Discussion 1802 flags an 80% chance of a Severe Thunderstorm Watch this afternoon (valid until 8 PM CDT). The affected area stretches from central SD into northern NE.

Check SPC's graphic at www.spc.noaa.gov for the latest boundaries.

Stay prepared: Monitor local NWS updates, have a severe weather plan, and seek shelter if storms approach. Know your safe room and keep devices charged.