Remnants of mesoscale convective systems over the Great Lakes advanced into the Ohio River Valley throughout the day on August 12th and helped to create severe storms. Despite little effective shear, DCAPE was very high (between 1300-1400J/kg) and was enough to accelerate downdrafts, causing strong surface wind. Weak zonal flow also created an ideal situation for training storms to develop as well.

Flash Flood in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 21:00:00 to 12-AUG-21 23:30:00 (EST-5)
Location: NORTH IRWIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Flooding reported by local 911 Call Center; flooding on Turner Valley Road.

Flash Flood in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 21:30:00 to 12-AUG-21 23:30:00 (EST-5)
Location: STANDARD SHAFT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Flooding in commercial building.

Flood in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 21:45:00 to 13-AUG-21 01:00:00 (EST-5)
Location: OAKDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Downtown Oakdale shut down due to flooding.

Flash Flood in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 19:30:00 to 12-AUG-21 20:30:00 (EST-5)
Location: SHARPSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Washington Blvd was closed due to flooding; vehicle was underwater.

Flash Flood in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:45:00 to 12-AUG-21 20:00:00 (EST-5)
Location: NEW KENSINGTON
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A few flooded roadways in Arnold and New Kensington, this includes North Street and Constitution Blvd.

Flash Flood in JEFFERSON, PENNSYLVANIA
From 12-AUG-21 17:40:00 to 12-AUG-21 20:00:00 (EST-5)
Location: BROOKVILLE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Street flooding has been reported in the city of Brookville.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 12-AUG-21 12:38:00 to 12-AUG-21 12:38:00 (EST-5)
Location: HAMILTON
Magnitude: 55.00 EG
Reported by: 911 Call Center

A local 911 call center reported multiple trees down on Hamilton Porter Rd and Ewing Rd in Perry Township.

Hail in JEFFERSON, PENNSYLVANIA
From 12-AUG-21 16:35:00 to 12-AUG-21 16:35:00 (EST-5)
Location: BROOKVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported report hail.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 12-AUG-21 10:45:00 to 12-AUG-21 10:45:00 (EST-5)
Location: WEST MIDDLESEX
Magnitude: 55.00 EG
Reported by: 911 Call Center

A 911 Call Center reports trees down.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 12-AUG-21 10:55:00 to 12-AUG-21 10:55:00 (EST-5)
Location: NEW WILMINGTON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reports trees down.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 12-AUG-21 11:00:00 to 12-AUG-21 11:00:00 (EST-5)
Location: NEW CASTLE
Magnitude: 55.00 EG
Reported by: 911 Call Center

A local 911 Call Center reports trees down.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 12-AUG-21 12:25:00 to 12-AUG-21 12:25:00 (EST-5)
Location: WEST KITTANNING
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reports trees down in and around the West Kittanning region.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 12-AUG-21 12:40:00 to 12-AUG-21 12:40:00 (EST-5)
Location: SPORTSBURG
Magnitude: 55.00 EG
Reported by: 911 Call Center

A local 911 Call Center reported multiple trees reported down on power lines in the area of Young Township.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 12-AUG-21 12:42:00 to 12-AUG-21 12:42:00 (EST-5)
Location: PUNXSUTAWNEY
Magnitude: 55.00 EG
Reported by: 911 Call Center

A local 911 Call Center reports several trees and power lines down in the city of Punxsutawney.

Thunderstorm Wind in VENANGO, PENNSYLVANIA
From 12-AUG-21 15:49:00 to 12-AUG-21 15:49:00 (EST-5)
Location: NICKLEVILLE
Magnitude: 55.00 EG
Reported by: 911 Call Center

A local 911 Call Center reports trees down in Rockland Township.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 12-AUG-21 16:15:00 to 12-AUG-21 16:15:00 (EST-5)
Location: NEW WILMINGTON
Magnitude: 55.00 EG
Reported by: County Official

Lawrence County Public Safety reported several trees down in the area. This includes the city of New Wilmington.

Hail in LAWRENCE, PENNSYLVANIA
From 12-AUG-21 16:30:00 to 12-AUG-21 16:30:00 (EST-5)
Location: WALMO
Magnitude: 0.75 
Reported by: Social Media

Hail reported via social media.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 12-AUG-21 16:30:00 to 12-AUG-21 16:30:00 (EST-5)
Location: NEW CASTLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Lawrence County Public Safety reported trees down in the New Castle area.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 12-AUG-21 16:30:00 to 12-AUG-21 16:30:00 (EST-5)
Location: BROOKVILLE
Magnitude: 55.00 EG
Reported by: 911 Call Center

A local 911 Call Center reported multiple trees and power lines down.

Hail in LAWRENCE, PENNSYLVANIA
From 12-AUG-21 16:31:00 to 12-AUG-21 16:31:00 (EST-5)
Location: NEW CASTLE
Magnitude: 0.75 
Reported by: Social Media

Hail reported via social media.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 12-AUG-21 16:38:00 to 12-AUG-21 16:38:00 (EST-5)
Location: STRATTANVILLE
Magnitude: 55.00 EG
Reported by: Social Media

Social media report of power lines and trees down.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 12-AUG-21 16:38:00 to 12-AUG-21 16:38:00 (EST-5)
Location: EASTBROOK
Magnitude: 55.00 EG
Reported by: Social Media

Social media report of many trees down and a corn field was destroyed.

Hail in BUTLER, PENNSYLVANIA
From 12-AUG-21 16:43:00 to 12-AUG-21 16:43:00 (EST-5)
Location: SLIPPERY ROCK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail reported via social media.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 12-AUG-21 16:45:00 to 12-AUG-21 16:45:00 (EST-5)
Location: BROOKVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported a tree on power lines in Brookville near Church Street.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 12-AUG-21 16:52:00 to 12-AUG-21 16:52:00 (EST-5)
Location: EASTBROOK
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported several trees down along or near Route 168 in Eastbrook.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 12-AUG-21 17:00:00 to 12-AUG-21 17:00:00 (EST-5)
Location: GLEN EDEN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Many trees down/broken; report via social media.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 12-AUG-21 17:01:00 to 12-AUG-21 17:01:00 (EST-5)
Location: GLEN EDEN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media report of a large uprooted tree on Settlers Village Circle (picture included).

Hail in BUTLER, PENNSYLVANIA
From 12-AUG-21 17:02:00 to 12-AUG-21 17:02:00 (EST-5)
Location: EUCLID
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail reported via social media.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 17:40:00 to 12-AUG-21 17:40:00 (EST-5)
Location: MONTOUR JCT
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media report of many downed trees and power outages. Picture of a tree down along 5th Avenue.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 12-AUG-21 17:04:00 to 12-AUG-21 17:04:00 (EST-5)
Location: CRIDERS CORNERS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported several trees and lines down in Cranberry Township.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 17:34:00 to 12-AUG-21 17:34:00 (EST-5)
Location: CARNOT
Magnitude: 55.00 EG
Reported by: Trained Spotter

A trained spotter reported around 20 trees down around the Robert Morris University campus.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 17:35:00 to 12-AUG-21 17:35:00 (EST-5)
Location: MOON CREST
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported large tree limbs and branches down.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 17:37:00 to 12-AUG-21 17:37:00 (EST-5)
Location: OSBORNE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported trees and power lines down at the intersection of Beaver Street and Glen Mitchell Road.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 12-AUG-21 17:38:00 to 12-AUG-21 17:38:00 (EST-5)
Location: STRATTANVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Report of power line and tree down via social media.

Flash Flood in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 20:45:00 to 12-AUG-21 23:00:00 (EST-5)
Location: CARNEGIE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A vehicle was stuck in water on Washington Road near the Dairy Queen. Flooding along Saw Mill Run by the Parkway West ramp.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 17:38:00 to 12-AUG-21 17:38:00 (EST-5)
Location: OSBORNE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported trees and wires down between Haysville Light and Glen Mitchell Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 18:04:00 to 12-AUG-21 18:04:00 (EST-5)
Location: BOYCE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a tree down on Mayview Road in Bridgeville.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 18:07:00 to 12-AUG-21 18:07:00 (EST-5)
Location: ACMETONIA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported a tree down on a trailer Werner Camp Road.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 12-AUG-21 18:09:00 to 12-AUG-21 18:09:00 (EST-5)
Location: PUNXSUTAWNEY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Report of trees down via social media.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:05:00 to 12-AUG-21 18:05:00 (EST-5)
Location: SHEARERSBURG
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported several trees and lines down in Allegheny Township.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-21 17:47:00 to 12-AUG-21 17:47:00 (EST-5)
Location: HICKORY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported several trees down in the area; this includes Burgettstown Road in Mt. Pleasant Township.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 18:00:00 to 12-AUG-21 18:00:00 (EST-5)
Location: OPTION
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media reported down trees.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 12-AUG-21 18:09:00 to 12-AUG-21 18:09:00 (EST-5)
Location: NORTH PT
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported trees and wires down.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 18:11:00 to 12-AUG-21 18:11:00 (EST-5)
Location: MT LEBANON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a tree down on Sleepy Hollow Road in Mt. Lebanon.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:18:00 to 12-AUG-21 18:18:00 (EST-5)
Location: EDGECLIFF
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported lines down on Applewood Drive and Garvers Ferry in Lower Burrell.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:20:00 to 12-AUG-21 18:20:00 (EST-5)
Location: VANDERGRIFT
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported a tree down on Labelle Due Road in Vandergrift.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:17:00 to 12-AUG-21 18:17:00 (EST-5)
Location: BLACKBURN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported a tree down on 7th Street Extension in Trafford.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:45:00 to 12-AUG-21 18:45:00 (EST-5)
Location: MC CULLOUGH
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported several trees and power lines down in Penn Township.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-21 18:43:00 to 12-AUG-21 18:43:00 (EST-5)
Location: MC MURRAY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported trees and power lines down at Thompsonville Rd and Parkwood Lane in Peters Township.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-21 18:37:00 to 12-AUG-21 18:37:00 (EST-5)
Location: HENDERSONVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported several trees and power lines down around Cecil Township.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:14:00 to 12-AUG-21 18:14:00 (EST-5)
Location: KINLOCK
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported large tree branches down.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:31:00 to 12-AUG-21 18:31:00 (EST-5)
Location: SALINA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported uprooted trees in the area.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-21 18:42:00 to 12-AUG-21 18:42:00 (EST-5)
Location: THOMPSONVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

County officials reported several trees down in Peters Township.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-21 19:45:00 to 12-AUG-21 19:45:00 (EST-5)
Location: WEST MIDDLETOWN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A local 911 Call Center reported a tree down on Washington Pike in Independence Township.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:41:00 to 12-AUG-21 18:41:00 (EST-5)
Location: DELMONT
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media report of trees snapped in Delmont.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 20:25:00 to 12-AUG-21 20:25:00 (EST-5)
Location: KEFFER
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported power lines down on Four Mile Run Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-21 20:30:00 to 12-AUG-21 20:30:00 (EST-5)
Location: MC KEES ROCKS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media report of tree damage.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 20:30:00 to 12-AUG-21 20:30:00 (EST-5)
Location: RECTOR
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported trees down across Ligonier Township.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-21 18:50:00 to 12-AUG-21 18:50:00 (EST-5)
Location: FORBES ROAD
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported trees and wires down.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 12-AUG-21 18:50:00 to 12-AUG-21 18:50:00 (EST-5)
Location: BRUSH VLY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported trees and wires down.