Significant instability combined with modest lapse rates and abundant deep-layer moisture (PW) produced numerous thunderstorm clusters with locally heavy rain during the afternoon and evening hours across central PA. Although vertical wind shear profiles were not particularly strong, strong destabilization lead to robust updrafts which produced marginally severe hail and damaging winds/wet microbursts. Localized flash flooding occurred in Potter and McKean Counties.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 11-SEP-13 18:56:00 to 11-SEP-13 18:56:00 (EST-5)
Location: SHIPPENSBURG ARPT
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees along Route 11 near Shippensburg.

Thunderstorm Wind in POTTER, PENNSYLVANIA
From 11-SEP-13 18:30:00 to 11-SEP-13 18:30:00 (EST-5)
Location: SHINGLEHOUSE
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires on Barbertown Road.

Thunderstorm Wind in MCKEAN, PENNSYLVANIA
From 11-SEP-13 18:30:00 to 11-SEP-13 18:30:00 (EST-5)
Location: BELLRUN
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees near Annin Creek.

Flash Flood in POTTER, PENNSYLVANIA
From 11-SEP-13 18:20:00 to 11-SEP-13 21:00:00 (EST-5)
Location: SHINGLEHOUSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Several thunderstorm clusters produced heavy rain and localized flash flooding in and around the Shinglehouse area.

Flash Flood in MCKEAN, PENNSYLVANIA
From 11-SEP-13 18:35:00 to 11-SEP-13 21:00:00 (EST-5)
Location: BELLRUN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Several thunderstorm clusters produced heavy rain and flash flooding across northeast McKean County. Road closures included RT 446, intersection of Newell Creek/Sartwell Roads, SR 155 in Turtlepoint, Taylor Brook Drive, Bell Run Road and Sun Valley Road near Eldred.

Hail in CUMBERLAND, PENNSYLVANIA
From 11-SEP-13 18:54:00 to 11-SEP-13 18:54:00 (EST-5)
Location: SHIPPENSBURG
Magnitude: 0.75 
Reported by: Social Media

Penny size hail (0.75 inch diameter) was reported near Shippensburg.

Thunderstorm Wind in POTTER, PENNSYLVANIA
From 11-SEP-13 18:26:00 to 11-SEP-13 18:26:00 (EST-5)
Location: GENESEE
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

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

Thunderstorm Wind in CAMBRIA, PENNSYLVANIA
From 11-SEP-13 16:05:00 to 11-SEP-13 16:05:00 (EST-5)
Location: FRUGALITY
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

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

Hail in LYCOMING, PENNSYLVANIA
From 11-SEP-13 15:10:00 to 11-SEP-13 15:10:00 (EST-5)
Location: HUGHESVILLE
Magnitude: 1.00 
Reported by: Social Media

Quarter size hail (1 inch diameter) was reported near Muncy.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 11-SEP-13 15:10:00 to 11-SEP-13 15:10:00 (EST-5)
Location: HUGHESVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Social Media

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

Thunderstorm Wind in DAUPHIN, PENNSYLVANIA
From 11-SEP-13 16:20:00 to 11-SEP-13 16:20:00 (EST-5)
Location: LYKENS
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Social Media

Thunderstorm winds estimated near 60 mph damaged a roof in Lykens.

Hail in SCHUYLKILL, PENNSYLVANIA
From 11-SEP-13 18:03:00 to 11-SEP-13 18:03:00 (EST-5)
Location: MAHANOY CITY
Magnitude: 1.00 
Reported by: Social Media

Quarter size hail (1 inch diameter) was reported in Mahanoy City.

Thunderstorm Wind in CLINTON, PENNSYLVANIA
From 11-SEP-13 13:30:00 to 11-SEP-13 13:30:00 (EST-5)
Location: SOUTH RENOVO
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

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

Hail in LYCOMING, PENNSYLVANIA
From 11-SEP-13 15:07:00 to 11-SEP-13 15:07:00 (EST-5)
Location: HUGHESVILLE
Magnitude: 0.75 
Reported by: Trained Spotter

Penny size hail (0.75 inch diameter) was reported in Hughesville.

Thunderstorm Wind in LYCOMING, PENNSYLVANIA
From 11-SEP-13 15:30:00 to 11-SEP-13 15:30:00 (EST-5)
Location: HUGHESVILLE
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 near Hughesville.

Thunderstorm Wind in CAMBRIA, PENNSYLVANIA
From 11-SEP-13 15:53:00 to 11-SEP-13 15:53:00 (EST-5)
Location: AMSBRY
Magnitude: 50.00 EG
Property damage: 2.50K
Reported by: CoCoRaHS

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

Hail in POTTER, PENNSYLVANIA
From 11-SEP-13 16:40:00 to 11-SEP-13 16:40:00 (EST-5)
Location: SHINGLEHOUSE
Magnitude: 1.00 
Reported by: State Official

Quarter size hail (1 inch diameter) was reported in Shinglehouse.