As a weak cold front dropped south from the Great Lakes on the afternoon of August 27th, a line of thunderstorm was able to develop ahead of the boundary, with a lake breeze off of Lake Erie also aiding initiation. Sufficient shear plus a strong mid-level jet combined with an unstable environment to create a good severe threat as the storms move to the ESE. The Storm Prediction Center anticipated the threat, placing the region under a slight risk of severe storms. Damaging wind ended up being the primary concern, as many reports of tree and power line damage were received.  In a couple of instances, automobiles became involved. At least 55,000 electrical customers across southwest Pennsylvania were without power at one point during the storms. Minor structural damage was reported in a few cases.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 16:56:00 to 27-AUG-20 16:56:00 (EST-5)
Location: GRATTON
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

On Old Indiana Road, trees were blown down.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 16:57:00 to 27-AUG-20 16:57:00 (EST-5)
Location: SMITHPORT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

On Glen Campbell Road, power lines were downed by the wind.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 16:58:00 to 27-AUG-20 16:58:00 (EST-5)
Location: BAKERSTOWN STATION
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power poles and wires were reported down.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:15:00 to 27-AUG-20 17:15:00 (EST-5)
Location: GLEN CAMPBELL
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Along Solley Road, trees were blown down.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:17:00 to 27-AUG-20 17:17:00 (EST-5)
Location: HOMER CITY
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: County Official

A tree was reported to be blown down on Highway 119 in Homer City.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 17:20:00 to 27-AUG-20 17:20:00 (EST-5)
Location: ARNOLA
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and wires were reported to be down across New Kensington.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 18:33:00 to 27-AUG-20 18:33:00 (EST-5)
Location: SCOTTDALE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were reported to be blown down near Scottdale.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 27-AUG-20 18:56:00 to 27-AUG-20 18:56:00 (EST-5)
Location: LAYTON
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A large tree was blown down near the corner of Layton and Falbo Roads.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 27-AUG-20 16:08:00 to 27-AUG-20 16:08:00 (EST-5)
Location: COALTOWN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were reported down at the intersection of Saniga Road and Pleasure Valley Lane.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 27-AUG-20 16:08:00 to 27-AUG-20 16:08:00 (EST-5)
Location: RED MILL
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Across Interestate 80, multiple trees were reported to be blown down.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 27-AUG-20 16:08:00 to 27-AUG-20 16:08:00 (EST-5)
Location: NEW CASTLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown on to a residence on Florence Avenue.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 27-AUG-20 16:38:00 to 27-AUG-20 16:38:00 (EST-5)
Location: SLATE LICK
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was blown on to a home off of Sportsman Road.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 27-AUG-20 16:42:00 to 27-AUG-20 16:42:00 (EST-5)
Location: ELK RUN JCT
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Rikers Road was closed due to trees being blown down across the road.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 27-AUG-20 16:42:00 to 27-AUG-20 16:42:00 (EST-5)
Location: ELK RUN JCT
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Along Elderberry Hill Road, there were numerous reports of trees down.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 27-AUG-20 16:58:00 to 27-AUG-20 16:58:00 (EST-5)
Location: KISKIMERE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Several trees and power poles were blown down in the vicinity of River Road.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 17:00:00 to 27-AUG-20 17:00:00 (EST-5)
Location: ARNOLD
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were reported to be blown down in Arnold.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:04:00 to 27-AUG-20 17:04:00 (EST-5)
Location: PARKWOOD
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported to be blown down on Anthony Run Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:25:00 to 27-AUG-20 17:25:00 (EST-5)
Location: HOMER CITY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Power lines were blown down on Lucerne Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:25:00 to 27-AUG-20 17:25:00 (EST-5)
Location: CLYMER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Power lines were blown down on Clymer Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:26:00 to 27-AUG-20 17:26:00 (EST-5)
Location: GLENWILLARD
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

In Edgeworth Borough, a tree was downed on to a house.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 27-AUG-20 15:55:00 to 27-AUG-20 15:55:00 (EST-5)
Location: WILMINGTON JCT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Phillips School Road was closed due to a tree and wires down across the roadway.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 27-AUG-20 16:00:00 to 27-AUG-20 16:00:00 (EST-5)
Location: KNOX
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Social Media

Many trees and power poles were reported to be blown over around Knox.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 27-AUG-20 16:06:00 to 27-AUG-20 16:06:00 (EST-5)
Location: BROOKVILLE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were reported to be down in Brookville, and power lines were felled on to a van.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 27-AUG-20 16:13:00 to 27-AUG-20 16:13:00 (EST-5)
Location: SUMMERVILLE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was felled on to a house.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 27-AUG-20 16:20:00 to 27-AUG-20 16:20:00 (EST-5)
Location: HUEY
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Downed branches and light roof damage were reported near Sligo.  Also, power outages were seen near Rimersburgh.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 27-AUG-20 16:27:00 to 27-AUG-20 16:27:00 (EST-5)
Location: RED MILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Downed trees were observed in Falls Creek.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 27-AUG-20 16:45:00 to 27-AUG-20 16:45:00 (EST-5)
Location: WILMINGTON JCT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Phillips School Road was closed due to a tree and wires down across the roadway.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 27-AUG-20 16:50:00 to 27-AUG-20 16:50:00 (EST-5)
Location: DIME
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported to be blown down on Dime Road in Bethel Township.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 16:51:00 to 27-AUG-20 16:51:00 (EST-5)
Location: ROSSITER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Power lines were reported to be down on Smyerstown Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:05:00 to 27-AUG-20 17:05:00 (EST-5)
Location: PARKWOOD
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: County Official

Telephone poles were downed on Parkwood Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:06:00 to 27-AUG-20 17:06:00 (EST-5)
Location: JOHNSONBURG
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Trees were reported to be blown down on Johnsonburg road.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 17:10:00 to 27-AUG-20 17:10:00 (EST-5)
Location: ARNOLA
Magnitude: 50.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Social Media

Numerous trees were blown down in New Kensington, and several power outages were reported.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:27:00 to 27-AUG-20 17:27:00 (EST-5)
Location: SEWICKLEY
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and wires were blown down at the intersection of Quaker Road and Meadow Lane.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:29:00 to 27-AUG-20 17:29:00 (EST-5)
Location: STOOPS FERRY
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large trees were blown down on Stoops Ferry Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:29:00 to 27-AUG-20 17:29:00 (EST-5)
Location: HEILWOOD
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Trees were blown down on Route 553.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 17:33:00 to 27-AUG-20 17:33:00 (EST-5)
Location: SEWARD
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Multiple trees were down at the corner of State Route 711 and Wilson Street.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:38:00 to 27-AUG-20 17:38:00 (EST-5)
Location: MC KEES ROCKS
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down and blocking the intersection of McCoy Road and Island Avenue.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:42:00 to 27-AUG-20 17:42:00 (EST-5)
Location: CARNEGIE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: County Official

Multiple trees were downed by wind in Carnegie.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:44:00 to 27-AUG-20 17:44:00 (EST-5)
Location: CARNEGIE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was blown down on to a house on Justus Street, causing roof damage.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:47:00 to 27-AUG-20 17:47:00 (EST-5)
Location: CHERRY CITY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Evergreen Road was closed due to wires being blown down.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:45:00 to 27-AUG-20 17:45:00 (EST-5)
Location: INGRAM
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down, blocking the roadway.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:51:00 to 27-AUG-20 17:51:00 (EST-5)
Location: MT LEBANON
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: County Official

Trees were blown down on Arch Avenue and Sleepy Hollow Road in Castle Shannon.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:57:00 to 27-AUG-20 17:57:00 (EST-5)
Location: MT LEBANON
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

A tree was reported to be blown on to a house.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 17:59:00 to 27-AUG-20 17:59:00 (EST-5)
Location: MUNHALL
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down on a home.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 27-AUG-20 16:28:00 to 27-AUG-20 16:28:00 (EST-5)
Location: BUTLER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large trees were blown over on Coventry Drive.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 27-AUG-20 16:34:00 to 27-AUG-20 16:34:00 (EST-5)
Location: HERMAN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported to be blown down on Hinchberger Road.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 27-AUG-20 16:35:00 to 27-AUG-20 16:35:00 (EST-5)
Location: BUTLER
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed by wind off Woodland Avenue south of Butler.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 16:52:00 to 27-AUG-20 16:52:00 (EST-5)
Location: ROSSITER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Trees were reported to be blown down on Setree Drive.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 16:55:00 to 27-AUG-20 16:55:00 (EST-5)
Location: SMITHPORT
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was downed on Smiley Road in Banks Township.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 16:55:00 to 27-AUG-20 16:55:00 (EST-5)
Location: JUNEAU
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were downed on Juneau Road.

Thunderstorm Wind in BEAVER, PENNSYLVANIA
From 27-AUG-20 17:12:00 to 27-AUG-20 17:12:00 (EST-5)
Location: BRIDGEWATER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was blown down on Sharon Road, with another report of power lines down on a car.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:12:00 to 27-AUG-20 17:12:00 (EST-5)
Location: HOMER CITY
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were blown down, and caught on fire after falling on power lines along Ferguson Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 27-AUG-20 17:12:00 to 27-AUG-20 17:12:00 (EST-5)
Location: CLAYPOOLE HGTS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Power lines were blown down on College Lodge Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 18:00:00 to 27-AUG-20 18:00:00 (EST-5)
Location: MUNHALL
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down on to a house.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 18:00:00 to 27-AUG-20 18:00:00 (EST-5)
Location: BOQUET
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down on to a road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 27-AUG-20 18:03:00 to 27-AUG-20 18:03:00 (EST-5)
Location: WEST MIFFLIN
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 18:12:00 to 27-AUG-20 18:12:00 (EST-5)
Location: SCOTT HAVEN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A motor vehicle accident occurred when a car crashed into a downed tree.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 18:13:00 to 27-AUG-20 18:13:00 (EST-5)
Location: WILLOW SPGS
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were reported to be blown down.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 27-AUG-20 18:15:00 to 27-AUG-20 18:15:00 (EST-5)
Location: COWANSBURG
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down near Lowber.