South Dakota Storms Surge Toward 100 MPH Wind Bow Echoes — SevereWX

Storms are firing up across south-central to southeast South Dakota this afternoon, fueled by scorching 105-110°F heat and extreme atmospheric instability. SPC's latest Mesoscale Discussion highlights a 95% chance of a severe thunderstorm watch within the next 1-2 hours, with winds potentially reaching 100 mph as these storms organize into an MCS.

A hot, unstable airmass overlies the region, packing around 2000 J/kg of MLCAPE despite some lingering low-level inhibition. Satellite and radar show surface-based development along the leading edge of mid-level cirrus, tied to a subtle shortwave trough. With steep lapse rates, wide temperature-dewpoint spreads, and moderate shear, expect outflow-dominant storms to congeal into a cold pool-driven system—prime for bow echoes and damaging straight-line winds.

Hail up to 1.25 inches is also possible, but the headline threat is wind damage from gusts of 85-100 mph. A Particularly Dangerous Situation (PDS) watch isn't off the table if intensities ramp up.

This setup echoes recent Dakotas activity but targets a fresh area in southeast South Dakota, where high moisture from the east meets heat from the west.

Stay prepared: Monitor local NWS updates, secure outdoor items, and have a severe weather plan ready. Act quickly if warnings are issued—shelter away from windows during peak storm time this evening.