A narrow squall line intensified as it surged eastward across central and eastern Pennsylvania during the late morning and early afternoon. The thin line of low-topped storms, without cloud-to-ground lightning detected, stretched from New York to Kentucky along a strong cold front. The cold frontal squall line produced widespread wind damage across central Pennsylvania and adjacent Mid-Atlantic states. The Storm Prediction Center had highlighted the damaging wind threat a day in advance with a moderate risk categorical convective outlook.

Thunderstorm Wind in CLEARFIELD, PENNSYLVANIA
From 08-SEP-12 10:30:00 to 08-SEP-12 10:30:00 (EST-5)
Location: DU BOIS
Magnitude: 50.00 EG
Property damage: 7.50K
Reported by: Public

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in DuBois. The severe winds also caused minor roof damage to shingles on a few homes.

Thunderstorm Wind in POTTER, PENNSYLVANIA
From 08-SEP-12 10:55:00 to 08-SEP-12 10:55:00 (EST-5)
Location: SWEDEN VLY
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees in Summit Township.

Thunderstorm Wind in CAMBRIA, PENNSYLVANIA
From 08-SEP-12 11:00:00 to 08-SEP-12 11:00:00 (EST-5)
Location: MORRELLVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees in West Taylor Township just northwest of Johnstown.

Thunderstorm Wind in SOMERSET, PENNSYLVANIA
From 08-SEP-12 11:05:00 to 08-SEP-12 11:05:00 (EST-5)
Location: CAIRNBROOK
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees along Monument Road near Central City.

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 08-SEP-12 12:16:00 to 08-SEP-12 12:16:00 (EST-5)
Location: FAIRFIELD ARPT
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires around Carrol Valley.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 08-SEP-12 11:35:00 to 08-SEP-12 11:35:00 (EST-5)
Location: TYRONE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down utility wires in Tyrone.

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 08-SEP-12 12:25:00 to 08-SEP-12 12:25:00 (EST-5)
Location: BENDERSVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in Bendersville.

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 08-SEP-12 12:34:00 to 08-SEP-12 12:34:00 (EST-5)
Location: YORK SPGS
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in York Springs.

Thunderstorm Wind in JUNIATA, PENNSYLVANIA
From 08-SEP-12 12:45:00 to 08-SEP-12 12:45:00 (EST-5)
Location: MIFFLIN
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down numerous trees and utility wires in Mifflintown.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 08-SEP-12 13:00:00 to 08-SEP-12 13:00:00 (EST-5)
Location: NEW SALEM
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down several 6-8 inch diameter limbs near Thomasville.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 08-SEP-12 12:55:00 to 08-SEP-12 12:55:00 (EST-5)
Location: NEWBERRY
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in the northwest section of Williamsport.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 08-SEP-12 13:05:00 to 08-SEP-12 13:05:00 (EST-5)
Location: STRINESTOWN
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph knocked down numerous limbs near Pine Tree and Cemetery Roads.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 08-SEP-12 13:10:00 to 08-SEP-12 13:10:00 (EST-5)
Location: FREYSVILLE
Magnitude: 50.00 EG
Property damage: 10.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph knocked down a utility pole near Red Lion.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 08-SEP-12 13:20:00 to 08-SEP-12 13:20:00 (EST-5)
Location: WASHINGTON
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph uprooted a 4-foot diameter tree and knocked down numerous large limbs.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 08-SEP-12 13:15:00 to 08-SEP-12 13:15:00 (EST-5)
Location: CLARKSTOWN
Magnitude: 50.00 EG
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down a radio tower just east of Muncy.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 08-SEP-12 13:30:00 to 08-SEP-12 13:30:00 (EST-5)
Location: HAMILTON PARK
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down several trees and utility wires in and around Lancaster.

Thunderstorm Wind in TIOGA, PENNSYLVANIA
From 08-SEP-12 11:40:00 to 08-SEP-12 11:40:00 (EST-5)
Location: NELSON
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph knocked down trees in Nelson.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 08-SEP-12 12:57:00 to 08-SEP-12 12:57:00 (EST-5)
Location: SEVEN VLYS
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph snapped a half-dozen large trees on a farm near Seven Valleys.

Thunderstorm Wind in POTTER, PENNSYLVANIA
From 08-SEP-12 10:45:00 to 08-SEP-12 10:45:00 (EST-5)
Location: HEBRON
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees in Hebron Township north of Coudersport.