Flash Flood in Delaware County, Pennsylvania

Flash Flood May 20, 2026 · Delaware County, Pennsylvania

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

What the National Weather Service wrote

Flooding was observed on Interstate 476 northbound 1.2 miles north of Exit 9, shutting down at least one lane of the interstate.

The wider storm

Isolated storms developed along a prefrontal trough by mid day on May 20. Later in the afternoon, a broader multicellular cluster of storms associated with the slow moving cold front moved into the region.

Began near Foxcroft (40.0011, -75.3484).

Source: NOAA Storm Events Database, event 1342601. Narratives are written by the National Weather Service forecast office that issued the report.

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