Thunderstorms developed in the hot and humid air mass, as a weak warm front, associated with low pressure over the Midwest, moved northward through the Mid Atlantic on the morning of June 29th. Strong thunderstorm wind gusts downed numerous trees and power lines, along with producing large hail in Chester and Delaware Counties.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 29-JUN-12 04:10:00 to 29-JUN-12 04:10:00 (EST-5)
Location: EAST LANSDOWNE
Magnitude: 50.00 EG
Reported by: Broadcast Media

A severe thunderstorm knocked trees down in Upper Darby.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 29-JUN-12 04:10:00 to 29-JUN-12 04:10:00 (EST-5)
Location: WEST PHILADELPHIA
Magnitude: 50.00 EG
Reported by: Broadcast Media

A severe thunderstorm snapped a power pole and brought wires down in Southwest Philadelphia.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 29-JUN-12 04:03:00 to 29-JUN-12 04:03:00 (EST-5)
Location: SPRING CITY
Magnitude: 52.00 EG
Reported by: NWS Employee

An estimated 60 mph wind gust was reported  in Spring City.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 29-JUN-12 04:05:00 to 29-JUN-12 04:05:00 (EST-5)
Location: COATESVILLE
Magnitude: 50.00 EG
Reported by: Post Office

A severe thunderstorm knocked down large tree limbs in Coatesville.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 29-JUN-12 04:10:00 to 29-JUN-12 04:10:00 (EST-5)
Location: CEDAR HOLLOW STATION
Magnitude: 50.00 EG
Reported by: Broadcast Media

A severe thunderstorm knocked large tree limbs down in Paoli.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 29-JUN-12 04:10:00 to 29-JUN-12 04:10:00 (EST-5)
Location: CRESCENTVILLE
Magnitude: 50.00 EG
Reported by: Newspaper

A severe thunderstorm knocked a tree down, blocking a part of Roosevelt Boulevard.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 29-JUN-12 04:15:00 to 29-JUN-12 04:15:00 (EST-5)
Location: EDGEMONT
Magnitude: 50.00 EG
Reported by: Trained Spotter

A severe thunderstorm knocked down at least one tree in Upper Providence.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 29-JUN-12 04:30:00 to 29-JUN-12 04:30:00 (EST-5)
Location: FOX CHASE
Magnitude: 50.00 EG
Reported by: Broadcast Media

A severe thunderstorm knocked down large tree limbs in Philadelphia.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 29-JUN-12 03:30:00 to 29-JUN-12 03:30:00 (EST-5)
Location: ELVERSON
Magnitude: 50.00 EG
Reported by: Public

A severe thunderstorm knocked large tree limbs down in Elverson.

Hail in BUCKS, PENNSYLVANIA
From 29-JUN-12 03:36:00 to 29-JUN-12 03:36:00 (EST-5)
Location: DUBLIN
Magnitude: 0.75 
Reported by: Public

A thunderstorm dropped penny-size hail in Dublin.

Hail in CHESTER, PENNSYLVANIA
From 29-JUN-12 03:50:00 to 29-JUN-12 03:50:00 (EST-5)
Location: WEST CHESTER
Magnitude: 1.00 
Reported by: Public

A severe thunderstorm dropped quarter-size hail in West Chester.

Hail in BERKS, PENNSYLVANIA
From 29-JUN-12 04:00:00 to 29-JUN-12 04:00:00 (EST-5)
Location: BOYERTOWN
Magnitude: 0.75 
Reported by: Public

A thunderstorm dropped penny-size hail in Boyertown.

Hail in MONTGOMERY, PENNSYLVANIA
From 29-JUN-12 04:00:00 to 29-JUN-12 04:00:00 (EST-5)
Location: POTTSTOWN
Magnitude: 0.88 
Reported by: Public

A thunderstorm dropped nickel-size hail in Pottstown.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 29-JUN-12 04:15:00 to 29-JUN-12 04:16:00 (EST-5)
Location: EAGLEVILLE
Magnitude: 50.00 EG
Reported by: Public

A severe thunderstorm knocked down trees, large tree limbs and wires in Lower Providence Township and Norristown.

Hail in DELAWARE, PENNSYLVANIA
From 29-JUN-12 04:20:00 to 29-JUN-12 04:20:00 (EST-5)
Location: OAKMONT
Magnitude: 1.00 
Reported by: Public

A severe thunderstorm dropped quarter-size hail in Havertown.