A lingering upper level low pressure system drifting across Pennsylvania promoted low convective temperatures, allowing numerous showers and thunderstorms to develop, which concentrated near disturbances around the upper low.  Decent instability and strong low-level lapse rates promoted damaging wind gusts and hail.  Moisture overall was not excessive for August, but thanks to weak flow near the upper low, storm motion was generally 10 knots or less.  This promoted a few instances of flash flooding as well.

Flash Flood in ALLEGHENY, PENNSYLVANIA
From 13-AUG-18 13:52:00 to 13-AUG-18 14:15:00 (EST-5)
Location: PARKVIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash flooding was observed by a trained spotter near Bigler Drive.

Heavy Rain in ALLEGHENY, PENNSYLVANIA
From 13-AUG-18 12:55:00 to 13-AUG-18 12:55:00 (EST-5)
Location: MAGILL HGTS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported that 1.72 inches of rain fell in one hour, with 0.97 inches of that amount measured in 28 minutes.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 13-AUG-18 11:23:00 to 13-AUG-18 11:23:00 (EST-5)
Location: MC GRANN
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 blown down around Manor Township.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 13-AUG-18 12:29:00 to 13-AUG-18 12:29:00 (EST-5)
Location: ACME
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

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

Thunderstorm Wind in GREENE, PENNSYLVANIA
From 13-AUG-18 13:30:00 to 13-AUG-18 13:30:00 (EST-5)
Location: CRUCIBLE
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media reported that several trees were uprooted near Rices Landing.

Flood in WESTMORELAND, PENNSYLVANIA
From 13-AUG-18 12:54:00 to 13-AUG-18 14:30:00 (EST-5)
Location: STONEVILLA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

County 911 officials reported that water was covering the road near Route 30, and that lane restrictions have been made.

Lightning in ALLEGHENY, PENNSYLVANIA
From 13-AUG-18 13:59:00 to 13-AUG-18 13:59:00 (EST-5)
Location: OPTION
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A 45 year old male was struck by lightning in Schenley Park, and was transported to the hospital in critical condition.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-AUG-18 12:30:00 to 13-AUG-18 12:30:00 (EST-5)
Location: INDIANOLA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Citizens of Allegheny County reported hail.

Hail in ARMSTRONG, PENNSYLVANIA
From 13-AUG-18 12:47:00 to 13-AUG-18 12:47:00 (EST-5)
Location: DAYTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter of Armstrong County reported hail.

Hail in MERCER, PENNSYLVANIA
From 13-AUG-18 14:30:00 to 13-AUG-18 14:30:00 (EST-5)
Location: JACKSON CENTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The local media reported hail.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-AUG-18 12:24:00 to 13-AUG-18 12:24:00 (EST-5)
Location: TALLEY GAVEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Reports of hail in Allegheny County were shared on social media.