A line of pre-frontal convection developed well ahead of an approaching cold front in a moderate CAPE and moderate shear environment over central Pennsylvania during the afternoon of August 4, 2017. This line of storms produced numerous reports of wind damage, and a brief EF1 tornado formed with a cell on the southern portion of this line in Fulton County, PA.  Heavy rainfall also accompanied the storms.  Flash flooding occurred across Cumberland County on the evening of the 4th.

Thunderstorm Wind in PERRY, PENNSYLVANIA
From 04-AUG-17 18:38:00 to 04-AUG-17 18:38:00 (EST-5)
Location: ESHEOL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down near Ickesburg.

Thunderstorm Wind in PERRY, PENNSYLVANIA
From 04-AUG-17 18:40:00 to 04-AUG-17 18:40:00 (EST-5)
Location: NEWPORT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees between New Bloomfield and Newport.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 04-AUG-17 19:42:00 to 04-AUG-17 19:42:00 (EST-5)
Location: CEDAR CLIFF MANOR
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm producing winds estimated near 60 mph damaged a roof on a house near Camp Hill.

Thunderstorm Wind in MONTOUR, PENNSYLVANIA
From 04-AUG-17 19:50:00 to 04-AUG-17 19:50:00 (EST-5)
Location: DANVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees near Danville.

Thunderstorm Wind in COLUMBIA, PENNSYLVANIA
From 04-AUG-17 20:11:00 to 04-AUG-17 20:11:00 (EST-5)
Location: ESPY
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees along Central Road near Bloomsburg.

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 04-AUG-17 20:20:00 to 04-AUG-17 20:20:00 (EST-5)
Location: ASPERS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees in Menallen Township.

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 04-AUG-17 20:30:00 to 04-AUG-17 20:30:00 (EST-5)
Location: YORK SPGS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees in Huntington Township.

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 04-AUG-17 20:35:00 to 04-AUG-17 20:35:00 (EST-5)
Location: YORK SPGS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees in Latimore Township.

Thunderstorm Wind in FRANKLIN, PENNSYLVANIA
From 04-AUG-17 20:45:00 to 04-AUG-17 20:45:00 (EST-5)
Location: ROXBURY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires in northern Franklin County.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 04-AUG-17 22:30:00 to 04-AUG-17 22:30:00 (EST-5)
Location: LOGANVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A severe thunderstorm producing winds estimated near 60 mph knocked down trees in Springfield Township.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 04-AUG-17 22:40:00 to 04-AUG-17 22:40:00 (EST-5)
Location: RED LION
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm producing winds estimated near 60 mph knocked down numerous large trees near Red Lion.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 04-AUG-17 23:05:00 to 04-AUG-17 23:05:00 (EST-5)
Location: HOLLINGER
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires along New Danville Pike south of Lancaster.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 04-AUG-17 23:25:00 to 04-AUG-17 23:25:00 (EST-5)
Location: HAHNSTOWN
Magnitude: 52.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down numerous trees and wires along Ebersole Road and Ridge Avenue.

Flash Flood in CUMBERLAND, PENNSYLVANIA
From 04-AUG-17 22:15:00 to 05-AUG-17 00:15:00 (EST-5)
Location: PLAINFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous roads were flooded across the western portion of Cumberland County.  A water rescue occurred at Clay and Hanover Streets in Carlisle.

Thunderstorm Wind in SNYDER, PENNSYLVANIA
From 04-AUG-17 19:17:00 to 04-AUG-17 19:17:00 (EST-5)
Location: DUNDORE
Magnitude: 78.00 EG
Property damage: 55.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A severe thunderstorm produced very strong straight-line winds estimated near 90 mph, damaging a garage, a couple of barns, some trees and a cornfield north of Port Treverton in Snyder County.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 04-AUG-17 12:30:00 to 04-AUG-17 12:30:00 (EST-5)
Location: MIDDLESEX
Magnitude: 52.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down several large trees across the 2600 block of Route 11 east of Carlisle. Trees down elsewhere in Cumberland County as well.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 04-AUG-17 13:30:00 to 04-AUG-17 13:30:00 (EST-5)
Location: CEDAR CLIFF MANOR
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down a large tree across the road near the Route 11/Route 15 split in Camp Hill.

Thunderstorm Wind in WARREN, PENNSYLVANIA
From 04-AUG-17 13:45:00 to 04-AUG-17 13:45:00 (EST-5)
Location: YOUNGSVILLE
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires along Mead Run Road near Youngsville.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 04-AUG-17 14:39:00 to 04-AUG-17 14:39:00 (EST-5)
Location: PENNSDALE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down a tree and wires along Bush Hollow Road near Pennsdale.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 04-AUG-17 14:47:00 to 04-AUG-17 14:47:00 (EST-5)
Location: DUBOISTOWN
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down a tree and wires along Jack's Hollow Road in Armstrong Township.

Thunderstorm Wind in SCHUYLKILL, PENNSYLVANIA
From 04-AUG-17 15:03:00 to 04-AUG-17 15:03:00 (EST-5)
Location: SHENANDOAH
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph blew off a portion of a roof on a structure on West Arlington Street in Shenandoah.

Thunderstorm Wind in SULLIVAN, PENNSYLVANIA
From 04-AUG-17 15:27:00 to 04-AUG-17 15:27:00 (EST-5)
Location: MILDRED
Magnitude: 52.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees in multiple locations in Colley Township.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 04-AUG-17 15:31:00 to 04-AUG-17 15:31:00 (EST-5)
Location: CANAN
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down trees along Sugar Run Road in Allegheny Township.

Thunderstorm Wind in HUNTINGDON, PENNSYLVANIA
From 04-AUG-17 15:43:00 to 04-AUG-17 15:43:00 (EST-5)
Location: MC ALEVYS FORT
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down numerous trees and wires along Route 26 in northern Huntindgon County.

Thunderstorm Wind in SOMERSET, PENNSYLVANIA
From 04-AUG-17 15:45:00 to 04-AUG-17 15:45:00 (EST-5)
Location: OGLETOWN
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires near Ogletown.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 04-AUG-17 15:49:00 to 04-AUG-17 15:49:00 (EST-5)
Location: BELLWOOD
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down trees near Bellwood.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 04-AUG-17 16:01:00 to 04-AUG-17 16:01:00 (EST-5)
Location: TYRONE
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down wires onto Decker Hollow Road north of Tyrone.

Thunderstorm Wind in FULTON, PENNSYLVANIA
From 04-AUG-17 16:50:00 to 04-AUG-17 16:50:00 (EST-5)
Location: ANDOVER
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Social Media

A severe thunderstorm producing winds estimated near 60 mph knocked down several trees west of Andover.

Thunderstorm Wind in FULTON, PENNSYLVANIA
From 04-AUG-17 16:50:00 to 04-AUG-17 16:50:00 (EST-5)
Location: CRYSTAL SPG
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires near the intersection of Route 915 and Pleasant Valley Road near the Crystal Spring exit on I-70.

Thunderstorm Wind in FRANKLIN, PENNSYLVANIA
From 04-AUG-17 17:20:00 to 04-AUG-17 17:20:00 (EST-5)
Location: RICHMOND FURNACE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A severe thunderstorm producing winds estimated near 60 mph damaged multiple trees just east of Cowans Gap.

Thunderstorm Wind in FULTON, PENNSYLVANIA
From 04-AUG-17 17:20:00 to 04-AUG-17 17:20:00 (EST-5)
Location: MC CONNELLSBURG
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires near McConnellsburg.

Thunderstorm Wind in FRANKLIN, PENNSYLVANIA
From 04-AUG-17 17:34:00 to 04-AUG-17 17:34:00 (EST-5)
Location: UPPER STRASBURG
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down a tree and wires near Upper Strasburg.

Thunderstorm Wind in TIOGA, PENNSYLVANIA
From 04-AUG-17 17:34:00 to 04-AUG-17 17:34:00 (EST-5)
Location: WELLSBORO ARPT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees along Route 362 between Airport Road and the Wellsboro Country Club.

Thunderstorm Wind in TIOGA, PENNSYLVANIA
From 04-AUG-17 17:38:00 to 04-AUG-17 17:38:00 (EST-5)
Location: ASAPH
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires near the intersection of Dantz Run Road and Route 6 west of Wellsboro.

Thunderstorm Wind in TIOGA, PENNSYLVANIA
From 04-AUG-17 17:50:00 to 04-AUG-17 17:50:00 (EST-5)
Location: WHITNEYVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm producing winds estimated near 60 mph snapped trees along Lake Road near Hills Creek State Park.

Thunderstorm Wind in CLINTON, PENNSYLVANIA
From 04-AUG-17 18:11:00 to 04-AUG-17 18:11:00 (EST-5)
Location: DUNNSTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees near Dunnstown.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 04-AUG-17 18:14:00 to 04-AUG-17 18:14:00 (EST-5)
Location: LARRYVILLE
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

A severe thunderstorm producing winds estimated near 70 mph knocked down numerous trees along Route 287 near Larrysville.

Thunderstorm Wind in PERRY, PENNSYLVANIA
From 04-AUG-17 18:16:00 to 04-AUG-17 18:16:00 (EST-5)
Location: BLAIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees near Blain.