Several ingredients were in place for scattered severe thunderstorms on August 8th.  An upper shortwave trough embedded in northwest flow crossed the Great Lakes during the day.  Moist west-southwest flow maintained dewpoints in the mid 60s, which in concert with daytime heating, fueled instability.  Strengthening mid-level wind contributed to sufficient levels of shear, allowing an organized line of thunderstorms to cross the region in advance of a cold front.  Steep low-level lapse rates promoted a damaging wind threat, but low-level shear was insufficient for a tornado threat.  The Storm Prediction Center place the region under a slight risk of severe weather for the day.
Thunderstorms began to form in earnest in southeast Ohio around 4 PM, creating wind damage in Columbiana and Noble Counties, along with a large hail report.  The storms formed an organized line and swept across southwest Pennsylvania and northern West Virginia through the late afternoon and early evening.  Wind damage was mainly confined to Allegheny and Westmoreland Counties, with numerous reports of tree and power line damage.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 08-AUG-19 16:37:00 to 08-AUG-19 16:37:00 (EST-5)
Location: WILLOW SPGS
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The county emergency manager reported that trees were blown down on Mickanin Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 08-AUG-19 04:03:00 to 08-AUG-19 04:03:00 (EST-5)
Location: BOWER HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large branches were blown down according to a National Weather Service employee.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 08-AUG-19 16:37:00 to 08-AUG-19 16:37:00 (EST-5)
Location: CHARLEROI
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power lines were blown down on Lock Street, according to the county emergency manager.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 08-AUG-19 16:40:00 to 08-AUG-19 16:40:00 (EST-5)
Location: MADISON
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down on Brownstown Road, according to the county emergency manager.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 08-AUG-19 16:03:00 to 08-AUG-19 16:03:00 (EST-5)
Location: BOWER HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large branches were blown down according to a National Weather Service employee.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 08-AUG-19 16:41:00 to 08-AUG-19 16:41:00 (EST-5)
Location: MADISON
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A member of the public reported that trees and limbs were blown down to the south and southeast of town.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 08-AUG-19 16:37:00 to 08-AUG-19 16:37:00 (EST-5)
Location: WILLOW SPGS
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The county emergency manager reported that trees were blown down on Brokers Lane.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 08-AUG-19 16:37:00 to 08-AUG-19 16:37:00 (EST-5)
Location: WILLOW SPGS
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

County 911 officials reported that trees were blown down on Mickanin Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 08-AUG-19 16:10:00 to 08-AUG-19 16:10:00 (EST-5)
Location: GREGG
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported that trees were blown down on Baldwin and McMichael Roads.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 08-AUG-19 16:20:00 to 08-AUG-19 16:20:00 (EST-5)
Location: BETHEL PARK
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported that a tree was downed on Main Street.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 08-AUG-19 16:26:00 to 08-AUG-19 16:26:00 (EST-5)
Location: WHITE OAK
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Social Media

A social media user reported that a tree and power lines were down at the intersection of Oliver Way and Lincoln Way.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 08-AUG-19 16:30:00 to 08-AUG-19 16:30:00 (EST-5)
Location: MADISON
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The county emergency manager reported trees down on Kalamazoo Road and Highberger Road.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 08-AUG-19 16:30:00 to 08-AUG-19 16:30:00 (EST-5)
Location: MARKVUE MANOR
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The county emergency manager reported that poles and wires were blown down on Ridge Road.