The combination of another upper air disturbance and a weak surface trough triggered a line of strong to
severe thunderstorms that moved through Eastern Pennsylvania mainly during the second half of the afternoon of the 19th.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 19-AUG-11 16:00:00 to 19-AUG-11 16:00:00 (EST-5)
Location: MACUNGIE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm tore down large tree limbs and wires in Macungie.

Hail in MONROE, PENNSYLVANIA
From 19-AUG-11 13:45:00 to 19-AUG-11 13:45:00 (EST-5)
Location: TOBYHANNA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm dropped hail as large as golf balls in Tobyhanna and covered the ground.

Hail in LEHIGH, PENNSYLVANIA
From 19-AUG-11 15:25:00 to 19-AUG-11 15:25:00 (EST-5)
Location: GERMANSVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm dropped penny size hail in Germansville (Heidelberg Township).

Hail in CHESTER, PENNSYLVANIA
From 19-AUG-11 17:15:00 to 19-AUG-11 17:15:00 (EST-5)
Location: DOWNINGTOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm dropped penny size hail in Downingtown.

Hail in CHESTER, PENNSYLVANIA
From 19-AUG-11 17:00:00 to 19-AUG-11 17:00:00 (EST-5)
Location: CHESTER SPGS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm dropped nickel size hail in Chester Springs (West Pikeland Township).

Hail in CHESTER, PENNSYLVANIA
From 19-AUG-11 17:30:00 to 19-AUG-11 17:30:00 (EST-5)
Location: WEST CHESTER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm dropped nickel size hail in West Chester.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 19-AUG-11 16:10:00 to 19-AUG-11 16:10:00 (EST-5)
Location: NAZARETH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm tore down large tree limbs and wires in Nazareth.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 19-AUG-11 17:20:00 to 19-AUG-11 17:20:00 (EST-5)
Location: NORRISTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm tore down large tree limbs and wires in Norristown.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 19-AUG-11 17:20:00 to 19-AUG-11 17:20:00 (EST-5)
Location: NEWTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm tore down large tree limbs and wires in Newtown Township. A few large limbs were also dangling on wires.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 19-AUG-11 17:30:00 to 19-AUG-11 17:30:00 (EST-5)
Location: WEST CHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm tore down large trees and wires in West Chester.

Lightning in MONTGOMERY, PENNSYLVANIA
From 19-AUG-11 17:50:00 to 19-AUG-11 17:50:00 (EST-5)
Location: FLOURTOWN
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck the roof of a home on Bethlehem Pike in Fort Washington and started a fire. It took fire fighters about 30 minutes to extinguish the blaze. It was confined to the roof, although some holes had to be cut in the roof and walls to extinguish it. No serious injuries were reported.