EF0 Tornado — Butler, Pennsylvania

2025-05-21 · near Jamisonville, Butler, Pennsylvania

Event narrative

Several hardwood trees had large limbs broken off in a path in the 250-280 section of Mack Road in West Sunbury, PA. This was caused by a different circulation than the earlier tornado in Butler County. The damage was off of Mack Road and was provided by drone video to the National Weather Service since the area is not accessible by vehicle.

Wider weather episode

An occluding surface low slowly drifted across Ohio on May 21st. Bands of showers with embedded thunderstorms moved across southwest Pennsylvania. During the mid to late afternoon, one convective band, associated with ample 0-3km CAPE and surface vorticity, was able to generate four tornadoes across southwest PA. Three were relatively brief and weak, but one longer-track EF1 was noted in Washington County. Multiple rounds of slow-moving heavier rain also produced a number of flash flooding incidents.

View location on OpenStreetMap → (40.9639, -79.8913)

Source: NOAA Storm Events Database, event_id 1266149. Narrative written by the NWS forecast office that issued the report.