Two waves of severe storms entered the Ohio River Valley on July 13th. The first, was in the early morning hours. Despite the lack of day time heating, instability was available due to warm, moist advection under southwest flow. Vertical wind shear was also available as a trough approached an area of high pressure and a created a pressure gradient.
During the afternoon, warm and unstable conditions prevailed; dew points stayed in the lower 70s.  Mean-layer CAPE of 1500-2000 J/kg was able to develop.  Due to a gradient between upper high pressure off the east coast and a shortwave trough moving northeast through the Ohio Valley, moderate mid-level flow characterized by 30-40 knots of 0-6km shear prevailed.  This allowed storms to organize into multicellular storm clusters and short line segments.  Many wind damage reports were received, mainly to trees and power lines, although a few reports of structural damage were also noted.

Hail in INDIANA, PENNSYLVANIA
From 13-JUL-21 17:10:00 to 13-JUL-21 17:10:00 (EST-5)
Location: BRUSH VLY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 13-JUL-21 17:10:00 to 13-JUL-21 17:10:00 (EST-5)
Location: BRUSH VLY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

A member of the public reported that trees were snapped on their property.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 13-JUL-21 17:10:00 to 13-JUL-21 17:10:00 (EST-5)
Location: BRUSH VLY
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree fell through a mobile home along Shaffer Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 13-JUL-21 17:13:00 to 13-JUL-21 17:13:00 (EST-5)
Location: BRUSH VLY
Magnitude: 50.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Social Media

Many trees were reported to be down in Brush Valley.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 13-JUL-21 17:15:00 to 13-JUL-21 17:15:00 (EST-5)
Location: SWEENEYS XRDS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

A tree was downed at Exit 46B of I-70.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUL-21 02:48:00 to 13-JUL-21 02:48:00 (EST-5)
Location: ETNA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines were downed on Wible Run Road at Hillwood Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUL-21 02:58:00 to 13-JUL-21 02:58:00 (EST-5)
Location: OPTION
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines were blown down on Bausman Street.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUL-21 03:00:00 to 13-JUL-21 03:00:00 (EST-5)
Location: DORMONT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power lines were blown down on Banksville Road.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUL-21 03:00:00 to 13-JUL-21 03:00:00 (EST-5)
Location: MUNHALL
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Numerous trees were snapped or uprooted, bringing down power lines as well.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 13-JUL-21 03:04:00 to 13-JUL-21 03:04:00 (EST-5)
Location: MC CONNELLS MILL
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

In the vicinity of Chartiers, trees and power lines were reported to be blown down.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 13-JUL-21 03:04:00 to 13-JUL-21 03:04:00 (EST-5)
Location: CECIL
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and power lines were reportedly blown down in Cecil.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUL-21 03:05:00 to 13-JUL-21 03:05:00 (EST-5)
Location: (AGC)ALLEGHENY CO AR
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUL-21 03:30:00 to 13-JUL-21 03:30:00 (EST-5)
Location: OPTION
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: State Official

Trees and wires were blown down along Bausman Street.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 13-JUL-21 03:35:00 to 13-JUL-21 03:35:00 (EST-5)
Location: EXPORT
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Multiple trees were blown down in the area of Export.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 13-JUL-21 14:16:00 to 13-JUL-21 14:16:00 (EST-5)
Location: NEW CASTLE
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple trees and power lines were blown down in town.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 13-JUL-21 14:25:00 to 13-JUL-21 14:25:00 (EST-5)
Location: TRANSFER
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported to be downed near the intersection of Homer Lane and Colt Road.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 13-JUL-21 14:29:00 to 13-JUL-21 14:29:00 (EST-5)
Location: VALET
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported to be blown down on Old Mercer Road.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 13-JUL-21 14:34:00 to 13-JUL-21 14:34:00 (EST-5)
Location: GREENVILLE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

In Riverside Park, trees were blown down.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 13-JUL-21 14:36:00 to 13-JUL-21 14:36:00 (EST-5)
Location: ORANGEVILLE
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Trees and power lines were reported to be blown down.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 13-JUL-21 14:39:00 to 13-JUL-21 14:39:00 (EST-5)
Location: GREENVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree and wires were blown down on Old Williamson Road near the tractor supply company.  The tree was also reported to be on fire.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 13-JUL-21 14:40:00 to 13-JUL-21 14:40:00 (EST-5)
Location: LONDON
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees and wires were reported to be blown down just west of Grove City.

Thunderstorm Wind in VENANGO, PENNSYLVANIA
From 13-JUL-21 15:05:00 to 13-JUL-21 15:05:00 (EST-5)
Location: UTICA
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A few trees were reported to be blown down near Utica.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 13-JUL-21 15:10:00 to 13-JUL-21 15:10:00 (EST-5)
Location: HOOKER
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A couple trees were blown down near Route 38.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 13-JUL-21 15:12:00 to 13-JUL-21 15:12:00 (EST-5)
Location: KARNS CITY
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 Hooker Road.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 13-JUL-21 15:15:00 to 13-JUL-21 15:15:00 (EST-5)
Location: ZELIENOPLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

On East Beaver Street, trees were reported to be blown down.

Thunderstorm Wind in VENANGO, PENNSYLVANIA
From 13-JUL-21 15:15:00 to 13-JUL-21 15:15:00 (EST-5)
Location: COOPERSTOWN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A few trees were reported to be down.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 13-JUL-21 15:18:00 to 13-JUL-21 15:18:00 (EST-5)
Location: CRAIGSVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

On St. Patrick's Road, trees were reported to be blown down.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 13-JUL-21 15:23:00 to 13-JUL-21 15:23:00 (EST-5)
Location: MANORVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: State Official

A tree was reportedly downed on Bunker Hill Road.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 13-JUL-21 15:55:00 to 13-JUL-21 15:55:00 (EST-5)
Location: CLARION PARKER ARPT
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was blown down on Wood Street.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 13-JUL-21 16:01:00 to 13-JUL-21 16:01:00 (EST-5)
Location: STRATTANVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was blown down on Washington Road.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 13-JUL-21 16:01:00 to 13-JUL-21 16:01:00 (EST-5)
Location: HAWTHORN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Route 28 was closed in the area of 217 Brookville Street due to live power lines being downed on to the road.

Thunderstorm Wind in FOREST, PENNSYLVANIA
From 13-JUL-21 16:01:00 to 13-JUL-21 16:01:00 (EST-5)
Location: EAST HICKORY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A few trees were downed near US Route 62.

Thunderstorm Wind in FOREST, PENNSYLVANIA
From 13-JUL-21 16:02:00 to 13-JUL-21 16:02:00 (EST-5)
Location: TIONESTA
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported down around the town of Tionesta.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 13-JUL-21 16:04:00 to 13-JUL-21 16:04:00 (EST-5)
Location: SHANNONDALE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported to be downed along Route 28.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 13-JUL-21 16:07:00 to 13-JUL-21 16:07:00 (EST-5)
Location: UNIONTOWN
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A number of trees were reported to be blown down in the northeastern portion of Indiana County.

Thunderstorm Wind in FOREST, PENNSYLVANIA
From 13-JUL-21 16:19:00 to 13-JUL-21 16:19:00 (EST-5)
Location: BYROMTOWN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

On State Route 66, trees were blown down.

Thunderstorm Wind in JEFFERSON, PENNSYLVANIA
From 13-JUL-21 16:26:00 to 13-JUL-21 16:26:00 (EST-5)
Location: SIGEL
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were blown down on Route 36.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 13-JUL-21 16:27:00 to 13-JUL-21 16:27:00 (EST-5)
Location: WEST FAIRFIELD
Magnitude: 50.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm wind threw bricks on to a roof, blew a hot tub cover through a sliding glass door, and knocked down numerous trees along Stiffler Road.

Hail in INDIANA, PENNSYLVANIA
From 13-JUL-21 16:34:00 to 13-JUL-21 16:34:00 (EST-5)
Location: LUCIUSBORO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 13-JUL-21 16:34:00 to 13-JUL-21 16:34:00 (EST-5)
Location: LUCIUSBORO
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

Trees were downed on Route 56 between Brush Valley and Armagh.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 13-JUL-21 16:51:00 to 13-JUL-21 16:51:00 (EST-5)
Location: CENTERVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was downed on Centerville Lane.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 13-JUL-21 16:55:00 to 13-JUL-21 16:55:00 (EST-5)
Location: HESHBON
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were blown down along Rhine Road.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 13-JUL-21 17:05:00 to 13-JUL-21 17:05:00 (EST-5)
Location: BRUSH VLY
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Along Route 259, numerous trees were blown down.