A shortwave passage during the morning of July 29th spread mainly non-severe showers and thunderstorms across the region during the morning and midday hours.  However, a discrete cell along the back edge of the morning activity was able to develop an EF1 tornado along the Fayette-Westmoreland County border. This was a preview of what was to follow.
In the wake of this morning activity, instability was able to build as partial clearing occurred. Additional thunderstorms were able to develop in association with a prefrontal trough.  These storms were able to take advantage of deep shear, especially in the lower levels.  A cross-boundary component to this shear allowed discrete supercells to form during the mid and late afternoon hours.  Storm motions were favorable for the ingestion of streamwise vorticity, allowing for rotating storms, and the development of additional tornadoes in southwest Pennsylvania and eastern Ohio.  Three additional tornadoes occurred in southwest Pennsylvania, causing generally tree and light structural damage.  Thankfully, no injuries were reported. A few other damaging wind reports were received as well.

Tornado in VENANGO, PENNSYLVANIA
From 29-JUL-21 11:55:00 to 29-JUL-21 11:56:00 (EST-5)
Location: THORNBURGH
Tornado F-scale: EF0
Property damage: 15.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF-0 tornado, that was partially observed by a personal home
surveillance camera and confirmed via damage survey, formed near
Billingsley Road and advanced into an open field before crossing
State Route 417 (near Speer's Public Golf Course) and quickly
dissipating. The tornado passed near a home, snapped about a
dozen pine trees, and then uprooted a shallow rooted hardwood
tree before dissipating. Maximum wind speed was estimated at 85 MPH.

Tornado in INDIANA, PENNSYLVANIA
From 29-JUL-21 16:20:00 to 29-JUL-21 16:21:00 (EST-5)
Location: INDIANA CO ARPT
Tornado F-scale: EF0
Property damage: 50.00K
Crop damage: 1.00K
Reported by: NWS Storm Survey

An EF-0 tornado, that was observed by live video and confirmed via damage
survey, began in a cornfield near Geesey Road, crossed a farmers property,
and dissipated at the end of the property. Minor crop damage was noted
near Geesey Road where the tornado began. The tornado then tracked
east-southeast where it struck the side of a barn and tossed portions
of the roofing and siding 100 feet away from the structure. Finally,
some damage was noted on the side of a open barn shed where a 2x4 struck a
metal side of a structure. Maximum wind speed was estimated at 75 MPH.

Tornado in GREENE, PENNSYLVANIA
From 29-JUL-21 17:00:00 to 29-JUL-21 17:05:00 (EST-5)
Location: CRABAPPLE
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF-1 tornado damaged a rural portion of extreme western Greene
County during the early evening of July 29th. The affected area
was just south of State Gamelands No. 302, in a region of
rough terrain characterized by dense wooded areas, mixed with open
farm land and gas well production infrastructure.
Damage from this tornado was confined to mainly hardwood trees in
the wooded areas. The tornado snapped a number of small trees,
uprooted several larger ones, and downed numerous large branches
over the course of its nearly 3 mile track. The initial damage
occurred at the bridge crossing Enlow Fork on the Pennsylvania
side of the MarkWest Majorsville Station. As the storm tracked to
the southeast, it reached peak intensity along Day Road, where
considerable tree damage was noted from an adjacent hill,
extending down into a deep ravine. Several large trees were
uprooted along with many smaller ones snapped. The tornado's maximum wind speed of 105 MPH was estimated in this area. Sporadic tree damage was noted as the tornado moved southeast and crossed Fry Hill Road, Scott Hill Road, and finally along the southern spur of
Day Road once again (just southeast of the Veterans Road fork).
This is the eighth documented tornado to impact Greene County
since 1950, and is the first since October 2nd 2018. In addition,
this marks the 8th tornado confirmed within the NWS Pittsburgh
forecast area from the July 29th outbreak, the most in a single
event since May 1st 2017, when seven tornadoes were recorded
over northwest Pennsylvania.

Tornado in FAYETTE, PENNSYLVANIA
From 29-JUL-21 12:54:00 to 29-JUL-21 13:00:00 (EST-5)
Location: WHITE
Tornado F-scale: EF1
Property damage: 250.00K
Crop damage: 5.00K
Reported by: NWS Storm Survey

Initial damage was noted on Bear Rocks Road near Grandview Road,
consisting of large branch snaps and uprooted trees consistent with
EF0 damage. The tornado then continued roughly along Grandview Road
towards Mount Zion Road with similar additional tree damage.
The tornado then crossed Mount Zion Church Road and gained strength,
causing minor damage to a roof and a deck.  The tornado crossed a field
and snapped a few apple trees, and then caused minor damage to a barn.
Near this barn, a tree trunk was snapped, consistent with EF-1 wind
speed.
The most intense damage was noted on Kessler School Road. A manufactured
shed was tossed on its side about 20 feet.  Also, a manufactured garage
had partial wall collapse and a roof blown off, with the roof transported about 20 feet downwind.  EF1 damage of 100 to 105 MPH (the maximum for the tornado) was assigned here.  Additional tree damage occurred further down Kessler School Road to the intersection with Coffman Road.  A storage building was tipped over on its side, but the roof was intact and the structure was sitting unattached on cinder blocks, consistent with 90 to 95 MPH EF0 wind. The tornado then crossed a hill, moving into Westmoreland County.

Tornado in WESTMORELAND, PENNSYLVANIA
From 29-JUL-21 13:00:00 to 29-JUL-21 13:03:00 (EST-5)
Location: ROARING RUN
Tornado F-scale: EF1
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

After crossing the Fayette/Westmoreland County line, the tornado continued across a hill. It crossed County Line Road and Hellen School Road, and it possibly lifted briefly as no damage was noted during the survey in this area. The last noted damage occurred on Mountain View Road, with snapped tree branches and damage to a tin roof at Mountain View Acres. The tornado then dissipated in the woods along Mount Olive Road. Although the tornado was rated EF-1 based on damage in Fayette County, the maximum wind speed for the Westmoreland portion of the track was 60 to 70 MPH.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 29-JUL-21 16:30:00 to 29-JUL-21 16:30:00 (EST-5)
Location: ARMAGH
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Utility lines were blown down along Dilltown Heights Road.

Thunderstorm Wind in GREENE, PENNSYLVANIA
From 29-JUL-21 18:36:00 to 29-JUL-21 18:36:00 (EST-5)
Location: MORRISVILLE
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous trees were reported down along Crabapple Drive on the north end of Waynesburg.