Jul 18, 2018
Winds backing ahead of a strong upper level wave along with approach of a upper level jet streak increased late-day shear and supported development of an initially isolated severe thunderstorm across central South Dakota. This storm pressed southeast producing copious amounts of wind-driven hail, then was followed by a more linear severe system a few hours later.
Source: NOAA National Weather Service Storm Events Database (event 773245). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Yankton County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.