Flash Flood in McCormick County, South Carolina

Flash Flood August 16, 2025 · McCormick County, South Carolina

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

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

The wider storm

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.

Began near Mc Cormick (33.9402, -82.1246).

Source: NOAA Storm Events Database, event 1279294. Narratives are written by the National Weather Service forecast office that issued the report.

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