Thunderstorm Wind — Gregory, South Dakota

2025-06-27 · near Dixon, Gregory, South Dakota

Event narrative

Winds measured by South Dakota Mesonet station Gregory 16N.

Wider weather episode

Thunderstorms developed along a nearly stationary pre-frontal boundary during the early evening across south central South Dakota. As cold pool development forced storms eastward off the initiating boundary into an environment with appreciable DCAPE and deep-layer shear of 40 to 50 knots, thunderstorms organized into a small bowing segment, which plowed east and southeast with up to nearly 90 mph winds. After several hours, storms moved into a less favorable environment with both lesser shear and instability toward the James River Valley and weakened.

View location on OpenStreetMap → (43.4600, -99.4400)

Source: NOAA Storm Events Database, event_id 1278538. Narrative written by the NWS forecast office that issued the report.