The combination of a weak cold front and upper air disturbance triggered scattered strong to severe thunderstorms, which produced damaging winds, small hail, and areas of heavy rain across portions of eastern Pennsylvania during the afternoon and evening of the 9th.

Hail in CHESTER, PENNSYLVANIA
From 09-AUG-12 14:11:00 to 09-AUG-12 14:11:00 (EST-5)
Location: ELVERSON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A strong thunderstorm dropped nickel size hail in Elverson.

Hail in MONTGOMERY, PENNSYLVANIA
From 09-AUG-12 14:30:00 to 09-AUG-12 14:30:00 (EST-5)
Location: POTTSTOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A strong thunderstorm dropped penny size hail in Pottstown at 3:30 pm EDT. This storm also produced a 52 mph wind gust at the Pottstown Municipal Airport at 3:15 pm EDT.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 09-AUG-12 15:45:00 to 09-AUG-12 15:45:00 (EST-5)
Location: NEWTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An intensifying thunderstorm knocked down a few trees in Newtown.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-AUG-12 18:30:00 to 09-AUG-12 18:30:00 (EST-5)
Location: REHRERSBURG
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm knocked down trees and wires throughout Tulpehocken Township.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-AUG-12 18:53:00 to 09-AUG-12 18:53:00 (EST-5)
Location: SHARTLESVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm knocked down a large tree in Upper Bern Township.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-AUG-12 19:30:00 to 09-AUG-12 19:30:00 (EST-5)
Location: MAIDEN CREEK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm knocked down a large tree in Maiden Creek.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-AUG-12 20:00:00 to 09-AUG-12 20:00:00 (EST-5)
Location: NEW JERUSALEM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Strong wind gusts produced by a severe thunderstorm knocked down electric wires in Rockland Township.

Lightning in NORTHAMPTON, PENNSYLVANIA
From 09-AUG-12 13:47:00 to 09-AUG-12 13:47:00 (EST-5)
Location: WESTGATE HILLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck and injured one person at the Drivers License Center In Hanover Township.

Lightning in LEHIGH, PENNSYLVANIA
From 09-AUG-12 12:30:00 to 09-AUG-12 12:30:00 (EST-5)
Location: SUMMIT LAWN
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Newspaper

A lightning strike and subsequent three alarm fire badly damaged a home in Salisbury Township. No injuries were reported.

Lightning in BUCKS, PENNSYLVANIA
From 09-AUG-12 14:50:00 to 09-AUG-12 14:50:00 (EST-5)
Location: NESHAMINY
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

A lightning strike and ensuing fire damaged the roof of a two story home on Log College Drive in Warminster Township. The homeowner escaped without any injuries.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-AUG-12 14:36:00 to 09-AUG-12 14:36:00 (EST-5)
Location: COVENTRYVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm knocked down a few trees in South Coventry Township.