During the morning and afternoon hours of May 21st, the advection of warmth and moisture into the Upper Ohio Valley helped to build daytime instability.  A couple of thunderstorm lines developed ahead of an evening cold front. In an environment of sufficient shear, many reports of wind damage were received.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 21-MAY-22 18:35:00 to 21-MAY-22 18:35:00 (EST-5)
Location: BESSEMER GWIN ARPT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two large trees were snapped on McClain Road.

Thunderstorm Wind in BEAVER, PENNSYLVANIA
From 21-MAY-22 18:35:00 to 21-MAY-22 18:35:00 (EST-5)
Location: GEORGETOWN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Multiple trees were reported to be down in town.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 21-MAY-22 18:55:00 to 21-MAY-22 18:55:00 (EST-5)
Location: CLARK
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

Shingle damage was done to a garage.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 21-MAY-22 18:55:00 to 21-MAY-22 18:55:00 (EST-5)
Location: CLARK
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Numerous trees were reported to be down around Valley View Road.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 21-MAY-22 19:05:00 to 21-MAY-22 19:05:00 (EST-5)
Location: FREDONIA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Multiple trees were reported down near Fredonia.

Hail in MERCER, PENNSYLVANIA
From 21-MAY-22 19:11:00 to 21-MAY-22 19:11:00 (EST-5)
Location: LONDON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 21-MAY-22 19:15:00 to 21-MAY-22 19:15:00 (EST-5)
Location: CENTERTOWN
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured on a home weather station.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 21-MAY-22 19:19:00 to 21-MAY-22 19:19:00 (EST-5)
Location: BAUERSTOWN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

A tree was blown down along Babcock Boulevard.

Thunderstorm Wind in VENANGO, PENNSYLVANIA
From 21-MAY-22 19:22:00 to 21-MAY-22 19:22:00 (EST-5)
Location: BULLY HILL
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

A tree fell on to a house on Buffalo Street.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 21-MAY-22 19:25:00 to 21-MAY-22 19:25:00 (EST-5)
Location: HOOKER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was felled on to power lines.

Thunderstorm Wind in VENANGO, PENNSYLVANIA
From 21-MAY-22 19:25:00 to 21-MAY-22 19:25:00 (EST-5)
Location: FRANKLIN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees and wires were blown down on Sugarcreek Drive.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 21-MAY-22 19:35:00 to 21-MAY-22 19:35:00 (EST-5)
Location: ALUM ROCK
Magnitude: 50.00 EG
Reported by: 911 Call Center

Trees were blown down in Richland Township.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 21-MAY-22 19:41:00 to 21-MAY-22 19:41:00 (EST-5)
Location: ELMO
Magnitude: 50.00 EG
Reported by: Social Media

Trees were downed all around the town of Kossuth.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 21-MAY-22 19:44:00 to 21-MAY-22 19:44:00 (EST-5)
Location: BOYERS
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Multiple trees were blown down on Boyers Road.

Thunderstorm Wind in FOREST, PENNSYLVANIA
From 21-MAY-22 19:51:00 to 21-MAY-22 19:51:00 (EST-5)
Location: TIONESTA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A few trees were blown down in the western part of the county. Around 600 customers lost power for a time.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 21-MAY-22 19:53:00 to 21-MAY-22 19:53:00 (EST-5)
Location: SHIPPENVILLE
Magnitude: 50.00 EG
Reported by: 911 Call Center

Trees were blown down across Elk Township.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 21-MAY-22 20:01:00 to 21-MAY-22 20:01:00 (EST-5)
Location: FRYBURG
Magnitude: 50.00 EG
Reported by: 911 Call Center

Across Washington Township, a number of trees were blown down.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 21-MAY-22 20:05:00 to 21-MAY-22 20:05:00 (EST-5)
Location: TYLERSBURG
Magnitude: 50.00 EG
Reported by: State Official

Trees were blown down in Farmington Township.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 21-MAY-22 20:07:00 to 21-MAY-22 20:07:00 (EST-5)
Location: TYLERSBURG
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Several trees were downed in the area.