A cold front triggered numerous severe thunderstorms across central Pennsylvania during the afternoon and evening. The strongest storms organized into intense bowing line segments and produced extensive downburst straight line wind damage and isolated one-inch diameter hail.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 22-SEP-10 14:39:00 to 22-SEP-10 14:39:00 (EST-5)
Location: BOILING SPGS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires on Leidigh Drive in South Middleton Township southeast of Carlisle near Boiling Springs.

Thunderstorm Wind in CLINTON, PENNSYLVANIA
From 22-SEP-10 14:54:00 to 22-SEP-10 14:54:00 (EST-5)
Location: LOCK HAVEN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds estimated near 60 mph knocked down numerous trees and utility wires in and around Lock Haven.

Thunderstorm Wind in SCHUYLKILL, PENNSYLVANIA
From 22-SEP-10 17:45:00 to 22-SEP-10 17:45:00 (EST-5)
Location: FRIEDENSBURG
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

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

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 22-SEP-10 17:46:00 to 22-SEP-10 17:46:00 (EST-5)
Location: SHIPPENSBURG
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

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

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 22-SEP-10 18:23:00 to 22-SEP-10 18:23:00 (EST-5)
Location: NEW OXFORD
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph knocked down multiple trees and utility wires along Route 94 near New Oxford.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 22-SEP-10 18:30:00 to 22-SEP-10 18:30:00 (EST-5)
Location: LEHMAN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph knocked down numerous trees and utility wires near Spring Grove.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 22-SEP-10 19:04:00 to 22-SEP-10 19:04:00 (EST-5)
Location: LANDISVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in East Hempfield Township near Landisville.

Thunderstorm Wind in FRANKLIN, PENNSYLVANIA
From 22-SEP-10 17:42:00 to 22-SEP-10 17:42:00 (EST-5)
Location: SHIPPENSBURG
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph blew a roof off a house on Route 11 (Molly Pitcher Highway) southwest of Shippensburg.

Thunderstorm Wind in FRANKLIN, PENNSYLVANIA
From 22-SEP-10 17:32:00 to 22-SEP-10 17:32:00 (EST-5)
Location: ST THOMAS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph knocked down utility wires on Main Street in St. Thomas. The damaging winds were associated with a convective outflow boundary/gust front south of the parent thunderstorm.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 22-SEP-10 14:55:00 to 22-SEP-10 14:55:00 (EST-5)
Location: SIDDONSBURG
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down large tree branches near Siddonsburg.

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 22-SEP-10 15:18:00 to 22-SEP-10 15:18:00 (EST-5)
Location: TWO TAVERNS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph knocked down trees in Mt. Joy Township near Germantown.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 22-SEP-10 15:28:00 to 22-SEP-10 15:28:00 (EST-5)
Location: GRANGEVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds estimated near 60 mph knocked down trees across southwest York County.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 22-SEP-10 15:30:00 to 22-SEP-10 15:30:00 (EST-5)
Location: GARDEN VIEW
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down trees near Williamsport.

Thunderstorm Wind in NORTHUMBERLAND, PENNSYLVANIA
From 22-SEP-10 15:35:00 to 22-SEP-10 15:35:00 (EST-5)
Location: DEWART
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down trees along River Road near Dewart.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 22-SEP-10 15:40:00 to 22-SEP-10 15:40:00 (EST-5)
Location: MUNCY
Magnitude: 70.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

NWS meteorologists confirmed a microburst near Muncy in southern Lycoming County around 1640 EDT. Peak thunderstorm winds were estimated near 80 mph based on extensive tree and roof damage. The intense, straight-line downburst winds uprooted or snapped numerous trees, causing structural damage to several homes. One very large tree landed on a vehicle traveling along S. Main Street and resulted in two fatalities.

Thunderstorm Wind in COLUMBIA, PENNSYLVANIA
From 22-SEP-10 15:52:00 to 22-SEP-10 15:52:00 (EST-5)
Location: JERSEYTOWN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

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

Thunderstorm Wind in YORK, PENNSYLVANIA
From 22-SEP-10 16:12:00 to 22-SEP-10 16:12:00 (EST-5)
Location: FAWN GROVE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

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

Thunderstorm Wind in COLUMBIA, PENNSYLVANIA
From 22-SEP-10 16:13:00 to 22-SEP-10 16:13:00 (EST-5)
Location: BERWICK
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds estimated near 60 mph knocked down numerous trees around Berwick and surrounding communities. Several roofs were damaged due to falling trees and branches.

Thunderstorm Wind in SOMERSET, PENNSYLVANIA
From 22-SEP-10 16:18:00 to 22-SEP-10 16:18:00 (EST-5)
Location: JEROME
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds estimated near 60 mph knocked down several trees and utility wires across northwest Somerset County.

Thunderstorm Wind in SCHUYLKILL, PENNSYLVANIA
From 22-SEP-10 17:28:00 to 22-SEP-10 17:28:00 (EST-5)
Location: TREMONT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds estimated near 60 mph knocked down numerous trees across southern Schuylkill County.

Thunderstorm Wind in FRANKLIN, PENNSYLVANIA
From 22-SEP-10 17:35:00 to 22-SEP-10 17:35:00 (EST-5)
Location: CHAMBERSBURG
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down utility wires along Route 30 near Chambersburg. The damaging winds were associated with an convective outflow boundary/gust front south of the parent thunderstorm.

Thunderstorm Wind in CLEARFIELD, PENNSYLVANIA
From 22-SEP-10 13:48:00 to 22-SEP-10 13:48:00 (EST-5)
Location: TYLER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Thunderstorm winds estimated near 60 mph knocked down trees in and around Parker Dam State Park. The severe winds also damaged an awning on one camper. The downed trees and large branches blocked both lanes along Tyler Road just northwest of the park, and the debris needed to be removed by heavy equipment. The wind damage extended farther east along the Caledonia Pike (Quehanna Highway) from southern Elk County to Karthaus.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 22-SEP-10 15:07:00 to 22-SEP-10 15:07:00 (EST-5)
Location: JERSEY SHR
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

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

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 22-SEP-10 15:29:00 to 22-SEP-10 15:29:00 (EST-5)
Location: (IPT)WILLIAMSPORT AR
Magnitude: 52.00 MG
Crop damage: 0.00K
Reported by: ASOS

The Williamsport Regional Airport ASOS reported a peak wind gust of 52 knots at 1629 EDT.

Thunderstorm Wind in COLUMBIA, PENNSYLVANIA
From 22-SEP-10 16:05:00 to 22-SEP-10 16:05:00 (EST-5)
Location: ORANGEVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm winds estimated near 60 mph knocked down several trees in Orangeville. A few houses sustained minor damage from the severe winds and falling trees/branches.