Flash Flood — Mccormick, South Carolina

2025-08-16 · near Mc Cormick, Mccormick, South Carolina

Event narrative

McCormick County dispatch reported a portion of Callison Hwy near Upper Mill Rd was closed due to flash flooding.

Wider weather episode

Thunderstorms developed in a highly unstable environment along a lingering boundary from a MCS that moved through the night before. Weak flow led to slow moving storms, propagating slowly along an outflow boundary. With precipitable water exceeding 2 inches and high soil moisture, this led to flash flooding near the Savannah River.

View location on OpenStreetMap → (33.9402, -82.1246)

Source: NOAA Storm Events Database, event_id 1279294. Narrative written by the NWS forecast office that issued the report.