Another in a series of weak mid-level shortwaves moved across the upper Ohio Valley during the afternoon hours.  The first storms formed near Interstate 80 around noon, with a broken line of convection then forming towards the southwest during the afternoon hours.
Instability and shear levels were sufficient to create an ideal environment for damaging wind gusts.  Many reports of tree and power line damage were received, along with a few instances of structural damage.  A roof was blown off of a house in Roscoe, and several structures were damaged by a storm at Sigel.  Flash flooding was also reported in Mercer County during the early evening, as a result of multiple thunderstorms moving over the area.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 18-AUG-19 13:55:00 to 18-AUG-19 13:55:00 (EST-5)
Location: BRADENVILLE
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: County Official

County 911 officials reported that trees were blown down on Bortz and County Roads.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 18-AUG-19 13:12:00 to 18-AUG-19 13:12:00 (EST-5)
Location: ROSCOE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

According to county 911 officials, there were numerous reports of trees and power lines blown down in Roscoe.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 18-AUG-19 14:10:00 to 18-AUG-19 14:10:00 (EST-5)
Location: WOODSIDE
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The county emergency manager's office reported that trees were blown down in Nicholson Township.

Hail in ARMSTRONG, PENNSYLVANIA
From 18-AUG-19 13:18:00 to 18-AUG-19 13:18:00 (EST-5)
Location: COLWELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in FAYETTE, PENNSYLVANIA
From 18-AUG-19 13:25:00 to 18-AUG-19 13:25:00 (EST-5)
Location: WHITSETT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 18-AUG-19 14:19:00 to 18-AUG-19 14:19:00 (EST-5)
Location: ULEDI
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down in Menallen Township, according to the county emergency manager.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 18-AUG-19 14:45:00 to 18-AUG-19 14:45:00 (EST-5)
Location: CALIFORNIA
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter observed multiple shingles torn off homes and large tree limbs down along Green Street.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 18-AUG-19 14:45:00 to 18-AUG-19 14:45:00 (EST-5)
Location: JEWELL
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

County 911 officials reported that trees and wires were downed near State Route 2030.

Hail in JEFFERSON, PENNSYLVANIA
From 18-AUG-19 17:07:00 to 18-AUG-19 17:07:00 (EST-5)
Location: SIGEL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 18-AUG-19 13:55:00 to 18-AUG-19 13:55:00 (EST-5)
Location: LOYALHANNA WOODLANDS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

County 911 officials reported that multiple trees were blown down in Loyalhanna Township, including on Bortz Road.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 18-AUG-19 13:07:00 to 18-AUG-19 13:07:00 (EST-5)
Location: ROSCOE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

County 911 officials reported that a roof was blown off of a house, and power lines were blown down as well.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 18-AUG-19 13:12:00 to 18-AUG-19 13:12:00 (EST-5)
Location: EAST CALIFORNIA
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and power lines were blown down in Jefferson Township, according to the county 911 call center.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 18-AUG-19 13:12:00 to 18-AUG-19 13:12:00 (EST-5)
Location: ARNOLD CITY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

The county 911 call center reported that trees and power lines were blown down in Washington Township.

Hail in FAYETTE, PENNSYLVANIA
From 18-AUG-19 13:33:00 to 18-AUG-19 13:33:00 (EST-5)
Location: WHITSETT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 18-AUG-19 13:35:00 to 18-AUG-19 13:35:00 (EST-5)
Location: MC CULLOUGH
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

County 911 officials reported that trees were blown down near Harrison City.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 18-AUG-19 17:07:00 to 18-AUG-19 17:07:00 (EST-5)
Location: SIGEL
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: County Official

County officials reported that trees were blown down and several structures were damaged in Sigel.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 18-AUG-19 17:11:00 to 18-AUG-19 17:11:00 (EST-5)
Location: SIGEL
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: County Official

Trees were blown down in Heath Township, according to county 911 officials.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 18-AUG-19 13:40:00 to 18-AUG-19 13:40:00 (EST-5)
Location: MANOR
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: County Official

According to county 911 officials, trees were blown down near Saddie Ridge Court.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 18-AUG-19 16:30:00 to 18-AUG-19 16:30:00 (EST-5)
Location: MILL CREEK
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: County Official

According to county 911 officials, trees were blown down near Tara Lane.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 18-AUG-19 16:35:00 to 18-AUG-19 16:35:00 (EST-5)
Location: DAY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

County 911 officials reported that multiple trees and wires were blown down in Clarion Township.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 18-AUG-19 17:00:00 to 18-AUG-19 17:00:00 (EST-5)
Location: GREENVILLE MUNI ARPT
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: County Official

Numerous trees were down across northern Mercer County, according to county 911 dispatchers.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 18-AUG-19 13:29:00 to 18-AUG-19 13:29:00 (EST-5)
Location: STAR JCT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

According to the county 911 call center, trees and power lines were blown down in Perry Township.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 18-AUG-19 13:30:00 to 18-AUG-19 13:30:00 (EST-5)
Location: NORTH IRWIN
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

County 911 officials reported that trees were blown down in North Huntingdon Township.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 18-AUG-19 17:05:00 to 18-AUG-19 17:05:00 (EST-5)
Location: HENLEIN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: County Official

County 911 officials reported numerous trees downed in the area of Greenville.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 18-AUG-19 17:42:00 to 18-AUG-19 17:42:00 (EST-5)
Location: BROCKWAY
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: County Official

Clay Plant Road was blocked by fallen trees, as reported by county 911 dispatchers.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 18-AUG-19 17:44:00 to 18-AUG-19 17:44:00 (EST-5)
Location: BROCKWAY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

County 911 dispatchers reported that multiple trees were down in Brockway.

Flash Flood in MERCER, PENNSYLVANIA
From 18-AUG-19 17:20:00 to 18-AUG-19 18:40:00 (EST-5)
Location: JAMESTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

County 911 officials reported flash flooding along North Good Hope Road.

Flash Flood in MERCER, PENNSYLVANIA
From 18-AUG-19 17:30:00 to 18-AUG-19 18:40:00 (EST-5)
Location: JAMESTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public reported water over Pennsylvania Route 58 near the Stone Arch Bridge.