Sep 11, 2019
A frontal boundary provided focus for convective development across south central South Dakota during the very late afternoon and early evening as a strong impulse moved in the southwest flow aloft. Initial discrete cells produced spotty hail and damaging wind, with MLCAPE values around 1500-2000 J/kg and 45-55 knots of deep-layer shear. As cells spread eastward and developed into a line, the increase in low-level jet during the evening quickly increased the 0-3 km shear to 35-40 knots. Three
Source: NOAA National Weather Service Storm Events Database (event 857693). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Lake County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.