Flash Flood — Allegheny, Pennsylvania

2025-06-27 · near Cheswick, Allegheny, Pennsylvania

Event narrative

Trained spotter reported flooding on Freeport Road between Cheswick and Harmar.

Wider weather episode

A warm, moist airmass remained in place through the latter half of the month which allowed for daily shower and thunderstorm chances. Training storms was the primary factor to the resultant flash flooding as cells developed upshear of the initial updrafts in West Virginia, Ohio, and Pennsylvania. One of these storms did result in yet another round of flash flooding for portions of Wheeling WV.

View location on OpenStreetMap → (40.5400, -79.8000)

Source: NOAA Storm Events Database, event_id 1279206. Narrative written by the NWS forecast office that issued the report.