An advancing cold front, along with shortwave support, created the chance for thunderstorms across the region. Sufficient shear (40kts in the 0-6km layer), moderate to high instability (1500-2000 J/kg of CAPE), and dry mid-level air resulted in damaging winds and hail. Flash flooding occurred, mostly south of Pittsburgh, with training storms.

Hail in LAWRENCE, PENNSYLVANIA
From 13-JUN-21 15:23:00 to 13-JUN-21 15:24:00 (EST-5)
Location: MC OASLIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Nickel to quarter sized hail reported on social media.

Hail in LAWRENCE, PENNSYLVANIA
From 13-JUN-21 15:20:00 to 13-JUN-21 15:21:00 (EST-5)
Location: NEW CASTLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported slightly smaller than a quarter sized hail.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:52:00 to 13-JUN-21 16:53:00 (EST-5)
Location: HIGHLAND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Slightly smaller than quarter sized hail was reported on social media.

Hail in WESTMORELAND, PENNSYLVANIA
From 13-JUN-21 16:52:00 to 13-JUN-21 16:53:00 (EST-5)
Location: FIVE PTS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to an inch and half hail reported via the public.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:55:00 to 13-JUN-21 16:56:00 (EST-5)
Location: WEXFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported quarter sized hail.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:58:00 to 13-JUN-21 16:59:00 (EST-5)
Location: HIGHCLIFF
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported quarter sized hail and large tree limbs down.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:15:00 to 13-JUN-21 17:16:00 (EST-5)
Location: MUNHALL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Less than quarter sized hail fell.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:00:00 to 13-JUN-21 17:01:00 (EST-5)
Location: OPTION
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Less than a quarter sized hail fell.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 13-JUN-21 15:17:00 to 13-JUN-21 15:17:00 (EST-5)
Location: EAST NEW CASTLE
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast Media reported multiple power lines knocked down southeast of New Castle.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 13-JUN-21 15:20:00 to 13-JUN-21 15:20:00 (EST-5)
Location: EASTBROOK
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

Large trees snapped in half on the road in Neshannock Township; report via social media.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:48:00 to 13-JUN-21 16:48:00 (EST-5)
Location: WEXFORD
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Social Media

Social media report of a large tree down.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:58:00 to 13-JUN-21 16:58:00 (EST-5)
Location: HIGHCLIFF
Magnitude: 55.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported large tree limbs down.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:00:00 to 13-JUN-21 17:00:00 (EST-5)
Location: INGOMAR
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

The public reported trees down across the area.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:00:00 to 13-JUN-21 17:00:00 (EST-5)
Location: CRAFTON
Magnitude: 55.00 EG
Reported by: NWS Employee

An NWS Employee reported a large tree limb down on Grandview Ave in Mount Washington.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:25:00 to 13-JUN-21 17:25:00 (EST-5)
Location: SHALECREST
Magnitude: 50.00 EG
Reported by: Public

The public reported trees down and some small hail.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 13-JUN-21 15:15:00 to 13-JUN-21 15:15:00 (EST-5)
Location: NEW CASTLE
Magnitude: 55.00 EG
Reported by: Social Media

Social media reported multiple trees down in New Castle.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:10:00 to 13-JUN-21 17:10:00 (EST-5)
Location: OPTION
Magnitude: 60.00 EG
Reported by: State Official

Numerous reports of damage to structures within the city.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:55:00 to 13-JUN-21 16:55:00 (EST-5)
Location: SHALECREST
Magnitude: 55.00 EG
Reported by: Social Media

Social media report of multiple trees down.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:24:00 to 13-JUN-21 17:24:00 (EST-5)
Location: ASPINWALL
Magnitude: 1.25 
Reported by: Trained Spotter

A trained spotter reported hail slightly larger than a quarter.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:59:00 to 13-JUN-21 17:04:00 (EST-5)
Location: WEXFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported quarter size hail; hail fell steady for 5 minutes.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:00:00 to 13-JUN-21 17:00:00 (EST-5)
Location: CHERRY CITY
Magnitude: 55.00 EG
Reported by: Public

The public reported a few trees and large branches down.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:20:00 to 13-JUN-21 17:20:00 (EST-5)
Location: RANKIN
Magnitude: 0.75 
Reported by: Public

The public reported hail slightly smaller than a quarter.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:30:00 to 13-JUN-21 17:30:00 (EST-5)
Location: EDGEWOOD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported hail slightly smaller than a quarter.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:35:00 to 13-JUN-21 16:35:00 (EST-5)
Location: BAKERSTOWN STATION
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media report of numerous large trees snapped near the PA Turnpike.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:10:00 to 13-JUN-21 17:10:00 (EST-5)
Location: CHERRY CITY
Magnitude: 55.00 EG
Reported by: NWS Employee

An NWS Employee reported a large tree limb snapped off near the Pittsburgh Fire Bureau Station 6.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:11:00 to 13-JUN-21 17:11:00 (EST-5)
Location: CHERRY CITY
Magnitude: 55.00 EG
Reported by: NWS Employee

An NWS Employee reported a large tree uprooted along Mintwood Street.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:15:00 to 13-JUN-21 17:15:00 (EST-5)
Location: EDGEWOOD
Magnitude: 1.00 
Reported by: Trained Spotter

A trained spotter reported hail the size of a quarter.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 13-JUN-21 16:34:00 to 13-JUN-21 16:34:00 (EST-5)
Location: MARS
Magnitude: 60.00 EG
Reported by: Social Media

Social media pictures of uprooted trees and blown apart swing set in Mars, PA.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:15:00 to 13-JUN-21 17:15:00 (EST-5)
Location: OPTION
Magnitude: 60.00 EG
Reported by: Social Media

Social media picture of tree onto a house.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:15:00 to 13-JUN-21 17:15:00 (EST-5)
Location: OPTION
Magnitude: 1.00 
Reported by: Social Media

Social media report of quarter inch hail.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:30:00 to 13-JUN-21 17:30:00 (EST-5)
Location: MUNHALL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported slightly smaller than quarter sized hail.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 13-JUN-21 16:52:00 to 13-JUN-21 16:52:00 (EST-5)
Location: FIVE PTS
Magnitude: 55.00 EG
Reported by: Public

Public report a few large trees down.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 16:58:00 to 13-JUN-21 16:58:00 (EST-5)
Location: SHALECREST
Magnitude: 55.00 EG
Reported by: Emergency Manager

Emergency manager reported numerous trees down in Shaler Twp. Large trees were on Heasley Road.

Flash Flood in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:25:00 to 13-JUN-21 18:40:00 (EST-5)
Location: OPTION
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 10.00K
Reported by: 911 Call Center

Multiple reports of flooding south and east of Pittsburgh, numerous vehicles were stuck. In Whitehall, intersection of Provost and Wayman flooded near Saw Mill Run. Widespread flooding was reported in West Mifflin. In Monroeville, near  I-376 East, a vehicle was stranded on ramp. A few streets were flooded in Swissvale.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:05:00 to 13-JUN-21 17:06:00 (EST-5)
Location: CHERRY CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Less than quarter sized hail fell.

Thunderstorm Wind in LAWRENCE, PENNSYLVANIA
From 13-JUN-21 15:27:00 to 13-JUN-21 15:27:00 (EST-5)
Location: WIEGLETOWN
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported power lines down.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:30:00 to 13-JUN-21 17:30:00 (EST-5)
Location: CHERRY CITY
Magnitude: 60.00 EG
Reported by: Social Media

Social media reports of multiple trees down.

Hail in ALLEGHENY, PENNSYLVANIA
From 13-JUN-21 17:16:00 to 13-JUN-21 17:16:00 (EST-5)
Location: RANKIN
Magnitude: 0.75 
Reported by: Public

The public reported hail slightly smaller than a quarter.