Aug 9, 2019
Scattered thunderstorms developed across central South Dakota during the late afternoon hours and moved southeast into an environment of deep mixed-layer instability and effective shear of around 50 knots in the evening. Storms transformed into short bowing segments as they moved along the main instability gradient toward the lower James River Valley.
Source: NOAA National Weather Service Storm Events Database (event 860531). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Gregory County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.