Thunderstorm Wind — Sumter, South Carolina

2025-06-13 · near Dalzell, Sumter, South Carolina

Event narrative

Sumter sheriff office reported trees down in Dalzell area. Time estimated by radar.

Wider weather episode

Diurnally driven convection developed within a moist and unstable air mass characterized by CAPE values greater than 2000 J/kg with weak wind shear and precipitable water values over 2 inches and dewpoints in the lower 70s. Storms were slow moving and trained across Richland and Sumter counties resulting in flash flooding. Isolated strong storms produced severe wind damage northwest of Sumter.

View location on OpenStreetMap → (34.0333, -80.4220)

Source: NOAA Storm Events Database, event_id 1258995. Narrative written by the NWS forecast office that issued the report.