A mid-level shortwave trough moved across the northern Great Lakes with a belt of stronger flow moving through the southern Great Lakes.  Scattered thunderstorms
developed through midday into the afternoon.  Forecast soundings showed some low-level hodograph curvature. Supercells evolved ahead of the cold front and create a large hail and tornado threat.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:12:00 to 12-AUG-23 19:12:00 (EST-5)
Location: PLEASANT GROVE
Magnitude: 2.00 
Property damage: 10.00K
Crop damage: 2.00K
Reported by: Social Media

Multiple photos of 2 inch hail just east of Claysville, PA.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:14:00 to 12-AUG-23 19:14:00 (EST-5)
Location: CLAYSVILLE
Magnitude: 3.00 
Property damage: 20.00K
Crop damage: 5.00K
Reported by: State Official

Three inch hail reported near Claysville, PA.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:15:00 to 12-AUG-23 19:15:00 (EST-5)
Location: LAGONDA
Magnitude: 1.25 
Reported by: Public

Mping report of half dollar hail just west of Green Hills, PA.

Thunderstorm Wind in VENANGO, PENNSYLVANIA
From 12-AUG-23 14:58:00 to 12-AUG-23 14:58:00 (EST-5)
Location: CHERRYTREE
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Two trees down near Cherrytree, PA.

Thunderstorm Wind in VENANGO, PENNSYLVANIA
From 12-AUG-23 14:40:00 to 12-AUG-23 14:40:00 (EST-5)
Location: DEMPSEYTOWN
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Tree and wires down in Dempseytown, PA.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 17:52:00 to 12-AUG-23 17:52:00 (EST-5)
Location: HICKORY
Magnitude: 58.00 EG
Crop damage: 1.00K
Reported by: Public

Tree limbs down northwest of Hickory, PA.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 12-AUG-23 16:30:00 to 12-AUG-23 16:30:00 (EST-5)
Location: PLEASANT HILL
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Trees and wires down along Portersville Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-23 17:15:00 to 12-AUG-23 17:15:00 (EST-5)
Location: BAKERSTOWN
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Trees down near Bakerstown, PA.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 18:00:00 to 12-AUG-23 18:00:00 (EST-5)
Location: NORTH WASHINGTON
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 2.00K
Reported by: Public

Several large trees down in North Washington area.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:24:00 to 12-AUG-23 20:24:00 (EST-5)
Location: ULEDI
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Large limbs down near Uledi, PA.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:28:00 to 12-AUG-23 20:28:00 (EST-5)
Location: YORK RUN JCT
Magnitude: 61.00 EG
Property damage: 25.00K
Reported by: Trained Spotter

Spotter reported that a trailer collapsed and occupants were trapped north of Smithfield, PA. No known injuries.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:40:00 to 12-AUG-23 19:40:00 (EST-5)
Location: LONE PINE
Magnitude: 61.00 EG
Property damage: 250.00K
Reported by: Public

Barn destroyed along Brush Run Road and trees down along Lone Pine Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 12-AUG-23 18:46:00 to 12-AUG-23 18:46:00 (EST-5)
Location: CRAMER
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Tree down along State Route 403 in the city of Cramer, PA.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 12-AUG-23 19:34:00 to 12-AUG-23 19:34:00 (EST-5)
Location: DIAMONDVILLE
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Trees down along Laurel Run Road.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:26:00 to 12-AUG-23 20:26:00 (EST-5)
Location: WALNUT HILL
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Mping report of trees uprooted near Walnut Hill Road.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 18:58:00 to 12-AUG-23 18:58:00 (EST-5)
Location: TAYLORSTOWN
Magnitude: 60.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Trees reported down on Brush Run Road and Green Cove Road.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:21:00 to 12-AUG-23 20:21:00 (EST-5)
Location: MC CLELLANDTOWN
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Power lines down along McClellandtown Road and Spring Road.

Thunderstorm Wind in GREENE, PENNSYLVANIA
From 12-AUG-23 20:16:00 to 12-AUG-23 20:16:00 (EST-5)
Location: CARMICHAELS
Magnitude: 60.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Multiple trees down in the city of Carmichaels, PA.

Thunderstorm Wind in GREENE, PENNSYLVANIA
From 12-AUG-23 19:52:00 to 12-AUG-23 19:52:00 (EST-5)
Location: WIND RIDGE
Magnitude: 59.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Trees down in the city of Wind Ridge, PA.

Thunderstorm Wind in GREENE, PENNSYLVANIA
From 12-AUG-23 20:26:00 to 12-AUG-23 20:26:00 (EST-5)
Location: SANDY RUN
Magnitude: 59.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Trees down in the city of Greensboro, PA.

Thunderstorm Wind in GREENE, PENNSYLVANIA
From 12-AUG-23 20:10:00 to 12-AUG-23 20:10:00 (EST-5)
Location: RICES LNDG
Magnitude: 60.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Trees down in the city of Rices Landing, PA.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-23 17:16:00 to 12-AUG-23 17:16:00 (EST-5)
Location: BAKERSTOWN STATION
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Report of multiple trees down along Bakerstown Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-23 17:42:00 to 12-AUG-23 17:42:00 (EST-5)
Location: BAIRDFORD
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Report of a a large uprooted tree in West Deer Township.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 17:56:00 to 12-AUG-23 17:56:00 (EST-5)
Location: NORTH WASHINGTON
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Report of many trees down along Beaver Run Road.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 12-AUG-23 15:23:00 to 12-AUG-23 15:23:00 (EST-5)
Location: BIG RUN
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Report of multiple trees down in southeast Jefferson County.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 12-AUG-23 16:40:00 to 12-AUG-23 16:40:00 (EST-5)
Location: JACKSON CENTER
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Trees and wires down near Jackson Center, PA.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 12-AUG-23 16:44:00 to 12-AUG-23 16:44:00 (EST-5)
Location: FARRELL
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Trees and wires down in the city of Sharon, PA.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 12-AUG-23 17:59:00 to 12-AUG-23 17:59:00 (EST-5)
Location: EDMON
Magnitude: 55.00 EG
Property damage: 15.00K
Crop damage: 1.00K
Reported by: Public

Report of a tree on a home near Edmon, PA.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 18:01:00 to 12-AUG-23 18:01:00 (EST-5)
Location: SALINA
Magnitude: 55.00 EG
Crop damage: 2.00K
Reported by: Public

Report of multiple trees down in the city of Salina, PA.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 20:00:00 to 12-AUG-23 20:00:00 (EST-5)
Location: DEEMSTON
Magnitude: 60.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Report of multiple trees down near Bethlehem Center Elementary School.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 12-AUG-23 19:32:00 to 12-AUG-23 19:32:00 (EST-5)
Location: MC DONALD
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Employee reported large branches McDonald, PA.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 19:40:00 to 12-AUG-23 19:40:00 (EST-5)
Location: MT PLEASANT
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

MPing report of tree limbs down in Mt. Pleasant, PA.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:35:00 to 12-AUG-23 19:35:00 (EST-5)
Location: LONE PINE
Magnitude: 60.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: NWS Employee

A NWS Employee reported trees down at mile marker 27 on I-79.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:18:00 to 12-AUG-23 19:18:00 (EST-5)
Location: WASHINGTON CO ARPT
Magnitude: 1.75 
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Golf ball hail reported by the public north of Green Hills, PA.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:25:00 to 12-AUG-23 20:25:00 (EST-5)
Location: ULEDI
Magnitude: 54.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Trained Spotter

Trained spotter reported trees down on New Salem and Kaider Road.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 17:39:00 to 12-AUG-23 17:39:00 (EST-5)
Location: WOODROW
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: NWS Employee

NWS Employee reported trees down.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 20:03:00 to 12-AUG-23 20:03:00 (EST-5)
Location: DEEMSTON
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: Public

Multiple trees snapped at the top.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:30:00 to 12-AUG-23 20:30:00 (EST-5)
Location: FAIRCHANCE
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Trees down along Jeffrey Lane.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:28:00 to 12-AUG-23 20:28:00 (EST-5)
Location: WALNUT HILL
Magnitude: 54.00 EG
Property damage: 1.00K
Crop damage: 1.00K
Reported by: 911 Call Center

Wires and trees down along Walnut Hill Road.

Thunderstorm Wind in GREENE, PENNSYLVANIA
From 12-AUG-23 20:32:00 to 12-AUG-23 20:32:00 (EST-5)
Location: DILLINER
Magnitude: 59.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees down in the city of Dilliner, PA.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:28:00 to 12-AUG-23 20:28:00 (EST-5)
Location: LEITH
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An emergency manager reported damage to festival tents along Main Street.

Thunderstorm Wind in FAYETTE, PENNSYLVANIA
From 12-AUG-23 20:28:00 to 12-AUG-23 20:28:00 (EST-5)
Location: LEITH
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An emergency manager reported damage to festival tents along Main Street.

Tornado in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:08:00 to 12-AUG-23 19:23:00 (EST-5)
Location: PLEASANT GROVE
Tornado F-scale: EF1
Property damage: 350.00K
Crop damage: 10.00K
Reported by: NWS Storm Survey

The National Weather Service in Pittsburgh conducted a storm
survey and concluded the damage was consistent with an EF-1 tornado.
Tornado damage began along Valley View Road in East Finley township.
An intermittent, and extremely narrow damage path continued along
Cracraft Road where an attached patio roof was taken off along with
part of the roof to the main residence. Additional snapped
or uprooted trees were observed further east along the
street at a neighboring residense. The most significant damage
occurred just past the midpoint of the tornado track, along the west
side of PA Route 221 where a cluster of approximately 30 pine trees
were all snapped near the base up to approximately 1/3rd of the way
up the trees, consistent with a high end EF1 rating. Additional
damage was noted along PA 18 to a township shed and outbuilding.
This was the end of the observed damage track, with beginning and
end concident with a well-defined gate-to-gate velocity couplet and
hook echo present from the Pittsburgh Doppler Radar. Length and
times of this tornado have been updated based on the additional
damage obtained since yesterday's initial survey. The very narrow
width to this tornado is further supported by video of the event
provided to the National Weather Service via social media.

Flash Flood in LAWRENCE, PENNSYLVANIA
From 12-AUG-23 16:45:00 to 12-AUG-23 17:45:00 (EST-5)
Location: HARBOR BRIDGE
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported that several roads in the town of New Castle were flooded.In addition, water, at least 8 inches deep, was flowing over highway 224 near Harbor Edinburg Rd.

Flood in INDIANA, PENNSYLVANIA
From 12-AUG-23 19:30:00 to 12-AUG-23 20:30:00 (EST-5)
Location: MARION CENTER
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Basement flooding reported at the Rain Drop In II near Marion Center in Indiana county as noted on social media. There was also water flowing over the route 119.

Hail in VENANGO, PENNSYLVANIA
From 12-AUG-23 14:46:00 to 12-AUG-23 14:46:00 (EST-5)
Location: DEMPSEYTOWN
Magnitude: 1.00 
Reported by: Public

Mping report of quarter sized hail near Dempseytown, PA.

Hail in VENANGO, PENNSYLVANIA
From 12-AUG-23 14:48:00 to 12-AUG-23 14:48:00 (EST-5)
Location: KANEVILLE
Magnitude: 1.00 
Reported by: Public

Quarter sized hail near Kaneville, PA.

Hail in VENANGO, PENNSYLVANIA
From 12-AUG-23 15:01:00 to 12-AUG-23 15:01:00 (EST-5)
Location: KANEVILLE
Magnitude: 1.00 
Reported by: Public

Quarter sized hail reported in Kaneville, PA.

Hail in ALLEGHENY, PENNSYLVANIA
From 12-AUG-23 17:33:00 to 12-AUG-23 17:33:00 (EST-5)
Location: LOGANS FERRY
Magnitude: 1.00 
Reported by: Social Media

Quarter sized hail reported in Springdale, PA. Photo provided via social media.

Hail in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 17:45:00 to 12-AUG-23 17:45:00 (EST-5)
Location: MERWIN
Magnitude: 1.25 
Reported by: Public

Half dollar sized hail reported near Merwin, PA.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 17:48:00 to 12-AUG-23 17:48:00 (EST-5)
Location: ATLASBURG
Magnitude: 1.00 
Reported by: Public

Quarter sized hail reported via Mping near Atlasburg, PA.

Hail in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 17:48:00 to 12-AUG-23 17:48:00 (EST-5)
Location: MERWIN
Magnitude: 1.25 
Reported by: Social Media

Half dollar hail reported via social media.

Hail in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 17:55:00 to 12-AUG-23 17:55:00 (EST-5)
Location: NORTH WASHINGTON
Magnitude: 1.00 
Reported by: Public

Quarter sized hail reported near North Washington, PA.

Hail in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 17:55:00 to 12-AUG-23 17:55:00 (EST-5)
Location: NORTH WASHINGTON
Magnitude: 1.00 
Reported by: Public

Quarter sized hail reported via the public.

Hail in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 17:56:00 to 12-AUG-23 17:56:00 (EST-5)
Location: NORTH WASHINGTON
Magnitude: 1.00 
Reported by: Public

Quarter sized hail reported along Beaver Run Road.

Hail in WESTMORELAND, PENNSYLVANIA
From 12-AUG-23 18:01:00 to 12-AUG-23 18:01:00 (EST-5)
Location: SALINA
Magnitude: 0.88 
Reported by: Public

Nickel sized hail reported near Salina, PA.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:00:00 to 12-AUG-23 19:00:00 (EST-5)
Location: VIENNA
Magnitude: 1.25 
Reported by: Public

Half dollar hail reported near Vienna, PA.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:08:00 to 12-AUG-23 19:08:00 (EST-5)
Location: CLAYSVILLE
Magnitude: 2.50 
Property damage: 10.00K
Crop damage: 2.00K
Reported by: Public

Tennis ball hail reported north of Claysville, PA. Picture provided.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:08:00 to 12-AUG-23 19:08:00 (EST-5)
Location: TAYLORSTOWN
Magnitude: 2.00 
Property damage: 5.00K
Crop damage: 1.00K
Reported by: Public

Two inch sized hail reported near Taylorstown, PA.

Hail in WASHINGTON, PENNSYLVANIA
From 12-AUG-23 19:10:00 to 12-AUG-23 19:10:00 (EST-5)
Location: WASHINGTON
Magnitude: 0.75 
Reported by: Amateur Radio

Ham radio operator reported nickel hail north of the city of Washington, PA.