Sep 13, 2023
A slow-moving thunderstorm briefly became severe over central Pennington County into north central Custer County, producing hail up to golf ball size along with heavy rainfall. The storm became nearly stationary just west of Hermosa and produced 2 to 5 inches of rainfall in less than 2 hours. Runoff from the heavy rainfall caused several roads to be inundated with water and debris west of Hermosa.
Source: NOAA National Weather Service Storm Events Database (event 1129705). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Custer County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.