Jul 9, 2025
An upper trough moved into the Southeast, acting as the main forcing in a strongly unstable environment with weak deep layer shear and high PWAT's. This forcing led to the development of scattered strong to severe convection that moved slowly due to the weak steering flow. The slow moving nature and efficient rainfall from these storms led to an area of flash flooding in Lancaster County, SC.
Source: NOAA National Weather Service Storm Events Database (event 1271286). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Lancaster County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.