The combination of an unseasonably hot and humid air mass and an approaching cold front helped trigger a line of strong to severe thunderstorms that moved through eastern Pennsylvania during the late afternoon and evening of the 9th.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 09-JUN-11 19:10:00 to 09-JUN-11 19:10:00 (EST-5)
Location: STANWOOD
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm knocked down several trees in Bensalem Township on Hughville, Mechanicsville and Galloway Roads. A couple of trees fell onto homes and vehicles, but no injuries were reported. The Doppler Radar from Fort Dix had measured wind speeds of 76 mph at two thousand feet above sea level as the severe thunderstorm moved through the county.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 09-JUN-11 17:35:00 to 09-JUN-11 17:35:00 (EST-5)
Location: LEHIGHTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm knocked down trees in Mahoning Township. Mahoning Mountain Road was closed just south of Pennsylvania State Route 443 because of a downed tree.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 09-JUN-11 16:50:00 to 09-JUN-11 16:50:00 (EST-5)
Location: SUN VLY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm downed trees and blocked Warner Road near Long Woods Drive in Chestnuthill Township.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 09-JUN-11 16:54:00 to 09-JUN-11 16:54:00 (EST-5)
Location: BARTONSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm knocked down a large tree and wires on Glenbrook Road in Jackson Township..The combination of lightning and wind caused about 400 homes and businesses to lose power in Jackson and Pocono Townships.

Hail in MONROE, PENNSYLVANIA
From 09-JUN-11 16:50:00 to 09-JUN-11 16:50:00 (EST-5)
Location: BRODHEADSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm dropped quarter size hail in Brodheadsville (Chesnuthill Township).

Hail in MONTGOMERY, PENNSYLVANIA
From 09-JUN-11 18:13:00 to 09-JUN-11 18:13:00 (EST-5)
Location: GILBERTSVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A thunderstorm dropped penny size hail in Gilbertsville (Douglass Township).

Hail in MONTGOMERY, PENNSYLVANIA
From 09-JUN-11 18:30:00 to 09-JUN-11 18:30:00 (EST-5)
Location: SOUDERTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm dropped quarter size hail in Telford Borough.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-JUN-11 18:15:00 to 09-JUN-11 18:15:00 (EST-5)
Location: PINE FORGE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm knocked down large tree limbs and wires in Douglass Township.

Hail in BUCKS, PENNSYLVANIA
From 09-JUN-11 18:30:00 to 09-JUN-11 18:30:00 (EST-5)
Location: PERKASIE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail fell in Perkasie.

Hail in BUCKS, PENNSYLVANIA
From 09-JUN-11 18:30:00 to 09-JUN-11 18:30:00 (EST-5)
Location: NEW BRITAIN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail fell in New Britain Township.

Hail in DELAWARE, PENNSYLVANIA
From 09-JUN-11 19:15:00 to 09-JUN-11 19:20:00 (EST-5)
Location: DREXEL HILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A line of thunderstorms dropped a swath of penny to nickel size hail across eastern Delaware County. Nickel size hail was reported Boothwyn while penny size hail was reported in Drexel Hill, Springfield, Clifton Heights, Sharon Hill and Lansdowne.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 09-JUN-11 19:10:00 to 09-JUN-11 19:10:00 (EST-5)
Location: WEST PHILADELPHIA
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A severe thunderstorm knocked down a tree onto a three story dwelling in Philadelphia.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 09-JUN-11 19:14:00 to 09-JUN-11 19:14:00 (EST-5)
Location: OVERBROOK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A severe thunderstorm knocked down a few trees around the intersection of Catharine and South 60th Streets in Philadelphia.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 09-JUN-11 19:21:00 to 09-JUN-11 19:21:00 (EST-5)
Location: (PHL)PHILADELPHIA IN
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A severe thunderstorm produced a wind gust to 58 mph at the Philadelphia International Airport.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 09-JUN-11 17:40:00 to 09-JUN-11 17:40:00 (EST-5)
Location: ASHFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm knocked down a couple of large tree limbs and wires in East Penn Township. One tree was set on fire on Dinkers Road because of the downed wires.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 09-JUN-11 16:30:00 to 09-JUN-11 16:30:00 (EST-5)
Location: MOUNTAINHOME
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm knocked down a couple of trees in Barrett Township. A downed tree blocked Pennsylvania State Route 191 near Pocono Plateau Road.

Lightning in MONROE, PENNSYLVANIA
From 09-JUN-11 17:07:00 to 09-JUN-11 17:07:00 (EST-5)
Location: EAST STROUDSBURG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning Struck a transformer near the East Stroudsburg High School on North Courtlandt Street.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 09-JUN-11 17:30:00 to 09-JUN-11 17:30:00 (EST-5)
Location: LEHIGHTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A Skywarn spotter estimated that a severe thunderstorm produced wind gusts up to 60 mph in Lehighton.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-JUN-11 18:50:00 to 09-JUN-11 18:50:00 (EST-5)
Location: WESTTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm knocked down several trees within a grove of trees in Westtown Township. The combination of damaging winds and lightning caused about 3,500 homes and businesses to lose power throughout Chester County.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 09-JUN-11 16:50:00 to 09-JUN-11 16:50:00 (EST-5)
Location: GILBERT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm produced wind gusts estimated at 60 mph in Gilbert (Polk Township).

Hail in MONROE, PENNSYLVANIA
From 09-JUN-11 16:50:00 to 09-JUN-11 16:50:00 (EST-5)
Location: GILBERT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm also dropped quarter size hail in Gilbert (Polk Township).