A hot and humid air mass was in place on the 21st ahead of a cold front. This resulted in the development of some thunderstorms from west to east, some of which were strong to locally severe.

Lightning in CHESTER, PENNSYLVANIA
From 21-AUG-09 14:05:00 to 21-AUG-09 14:05:00 (EST-5)
Location: JENNERSVILLE
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A house was struck by lightning in Penn Township.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 21-AUG-09 12:30:00 to 21-AUG-09 12:45:00 (EST-5)
Location: NEW MAHONING
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm tore down several trees across central Carbon County from Mahoning Township east through Towamensing Township.

Lightning in CHESTER, PENNSYLVANIA
From 21-AUG-09 13:05:00 to 21-AUG-09 13:05:00 (EST-5)
Location: SADSBURYVILLE
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A house was struck by lightning in Sadsbury Township. No injuries were reported.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 21-AUG-09 12:42:00 to 21-AUG-09 12:42:00 (EST-5)
Location: EMERALD
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 Washington Township in northeastern Lehigh County.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 21-AUG-09 13:15:00 to 21-AUG-09 13:15:00 (EST-5)
Location: CENTER VLY
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 Upper Saucon Township  in southeastern Lehigh County.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 21-AUG-09 13:00:00 to 21-AUG-09 13:00:00 (EST-5)
Location: KULPTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm tore down several trees in Birdsboro Borough. About 800 homes and businesses lost power. Power was restored by 6 p.m. EDT that evening.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 21-AUG-09 12:10:00 to 21-AUG-09 12:10:00 (EST-5)
Location: TOBYHANNA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm tore down large tree limbs and wires across Pennsylvania State Route 423 in Coolbaugh Township.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-AUG-09 13:30:00 to 21-AUG-09 14:00:00 (EST-5)
Location: OXFORD
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm tore down numerous tree limbs, trees and wires throughout Chester County, mainly along the southern tier. One tree fell on an occupied vehicle in Kenneth Township, but no injuries were reported.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 21-AUG-09 13:10:00 to 21-AUG-09 13:25:00 (EST-5)
Location: ROSSLAND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm tore down numerous trees across the southeastern third of Monroe County from Ross Township northeast through Hamilton, Stroudsburg and Middle Smithfield Townships. In Ross Township, in Saylorsburg, downed trees closed Lower Cherry Valley Road.  Downed trees forced the closure of River Road, the Joseph McDade Recreational Trail and the Hialeah Picnic Area within the Delaware Water Gap National Recreational Area. About 2,000 homes and businesses lost power in Monroe County.