A line of thunderstorms developed along an approaching cold front. Mostly clear skies and scattered cumulus clouds helped support surface heating and instability. Temperatures got up to the mid-80s; dewpoints were in the upper 60s. MLCAPE values neared 2000 J/kg; deep layer vertical wind shear increased in the afternoon hours.The Storm Prediction Center issued Severe Thunderstorm Watches for portions of Eastern Ohio and Western PA.

Thunderstorm Wind in VENANGO, PENNSYLVANIA
From 21-SEP-18 18:54:00 to 21-SEP-18 18:54:00 (EST-5)
Location: BULLY HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 call center reported multiple trees down in Sandy Creek Twp.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 21-SEP-18 18:19:00 to 21-SEP-18 18:19:00 (EST-5)
Location: FARRELL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported multiple trees down in Sharon.

Thunderstorm Wind in MERCER, PENNSYLVANIA
From 21-SEP-18 18:04:00 to 21-SEP-18 18:04:00 (EST-5)
Location: GREENVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported multiple trees down in Greenville.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 21-SEP-18 19:40:00 to 21-SEP-18 19:40:00 (EST-5)
Location: SHAMBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported trees down on powerlines in Richland Twp.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 21-SEP-18 19:36:00 to 21-SEP-18 19:36:00 (EST-5)
Location: FISHER
Magnitude: 50.00 EG
Reported by: 911 Call Center

A 911 Call Center reported a tree down in Farmington Twp.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 21-SEP-18 19:33:00 to 21-SEP-18 19:33:00 (EST-5)
Location: BROWNSDALE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported multiple trees and power lines down across southern Butler County.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 21-SEP-18 20:31:00 to 21-SEP-18 20:31:00 (EST-5)
Location: ERNEST
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported multiple trees down in Central and Northern Indiana County.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 21-SEP-18 20:07:00 to 21-SEP-18 20:07:00 (EST-5)
Location: NEW TEXAS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported trees and wires down on Greensburg Rd at Faulk Rd.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 21-SEP-18 20:46:00 to 21-SEP-18 20:46:00 (EST-5)
Location: (AGC)ALLEGHENY CO AR
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Allegheny Airport reported a 50 KT gust.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 21-SEP-18 19:51:00 to 21-SEP-18 19:51:00 (EST-5)
Location: HIGHCLIFF
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported multiple trees down across Ross Twp. Wires down near Bascom Ave.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 21-SEP-18 19:59:00 to 21-SEP-18 19:59:00 (EST-5)
Location: PARKVIEW
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reported tree down and blocking North Drive.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 21-SEP-18 19:54:00 to 21-SEP-18 19:54:00 (EST-5)
Location: JOFFRE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 911 Call Center reports power lines down and blocking both Creek Rd. and Steubenville Pike in Smith Twp.

Thunderstorm Wind in BEAVER, PENNSYLVANIA
From 21-SEP-18 19:30:00 to 21-SEP-18 19:30:00 (EST-5)
Location: ECONOMY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A NWS Employee reported 60 mph gusts near their home.