Flash Flood in Lancaster County, Pennsylvania

Flash Flood September 23, 2025 · Lancaster County, Pennsylvania

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

What the National Weather Service wrote

Multiple reports of water across the roadway resulted in the closure of New Holland Avenue between Lancaster and Eden.

The wider storm

Daytime heating during the afternoon and evening hours of September 23, 2025 allowed for convection to occur across portions of the Lower Susquehanna Valley in an environment with ample moisture and low steering flow aloft allowing for slow-moving thunderstorms. Thunderstorms produced a quick 3 to 4 inches of rainfall in Millersville, which prompted multiple instances of flash flooding in the vicinity of Millersville University.

Began near Lancaster (40.0511, -76.2899).

Source: NOAA Storm Events Database, event 1289346. Narratives are written by the National Weather Service forecast office that issued the report.

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