An approaching cold front coupled with a hot and humid air mass triggered strong to locally severe thunderstorms that affected Philadelphia and its nearby suburbs during the evening and overnight on the 27th.  Lightning strikes also occurred damage in Chester County. The thunderstorms also caused some flash flooding.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 27-JUL-14 22:40:00 to 27-JUL-14 22:40:00 (EST-5)
Location: DREXEL HILL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm knocked down a few trees and wires in Upper Darby Township.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 27-JUL-14 23:00:00 to 27-JUL-14 23:00:00 (EST-5)
Location: CRESCENTVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm knocked down three trees in Philadelphia.

Hail in DELAWARE, PENNSYLVANIA
From 27-JUL-14 22:40:00 to 27-JUL-14 22:40:00 (EST-5)
Location: MEDIA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm dropped nickel size hail in Media.

Lightning in CHESTER, PENNSYLVANIA
From 27-JUL-14 22:45:00 to 27-JUL-14 22:45:00 (EST-5)
Location: MALVERN
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A home was struck by lightning in Malvern Borough.

Lightning in CHESTER, PENNSYLVANIA
From 27-JUL-14 22:15:00 to 27-JUL-14 22:15:00 (EST-5)
Location: CHROME
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A home was struck by lightning in East Nottingham Township. Another lightning strike took down wires in the township.

Lightning in CHESTER, PENNSYLVANIA
From 27-JUL-14 21:27:00 to 27-JUL-14 21:27:00 (EST-5)
Location: BRANDYWINE MANOR
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Lightning struck and damaged wires and a pole in West Brandywine Township.

Lightning in CHESTER, PENNSYLVANIA
From 27-JUL-14 21:59:00 to 27-JUL-14 21:59:00 (EST-5)
Location: ROMANSVILLE
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Lightning struck a home in West Bradford Township.

Lightning in CHESTER, PENNSYLVANIA
From 27-JUL-14 22:00:00 to 27-JUL-14 22:00:00 (EST-5)
Location: PAOLI
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Lightning struck a propane tank in Paoli (Tredyffrin Township). No serious damage or injuries were reported.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 27-JUL-14 22:36:00 to 27-JUL-14 22:36:00 (EST-5)
Location: MOYLAN ROSE VLY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm knocked down a few trees and large tree limbs in Middletown Township. Some roadways were blocked by downed trees.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 27-JUL-14 22:48:00 to 27-JUL-14 22:48:00 (EST-5)
Location: COLLINGDALE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm knocked down a few trees and wires in Collingdale Borough.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 27-JUL-14 22:49:00 to 27-JUL-14 22:49:00 (EST-5)
Location: FOLCROFT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm knocked down a few trees and wires in Glenolden Borough.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 27-JUL-14 22:50:00 to 27-JUL-14 22:50:00 (EST-5)
Location: FOLCROFT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm knocked down a few trees and wires in Folcroft Borough.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 27-JUL-14 21:45:00 to 27-JUL-14 21:48:00 (EST-5)
Location: LEDERACH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm knocked down numerous trees in Lower Salford Township. Trees were knocked down along Cressman Road, Shadynook Road, Old Skippack Road, Main Street, Maple Avenue, Clemens Road and Astor Drive.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 27-JUL-14 20:25:00 to 27-JUL-14 20:25:00 (EST-5)
Location: HONEY BROOK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm knocked down poles and wires along Pennsylvania Route 10 at Wawassan Drive in Honey Brook Borough.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 27-JUL-14 21:40:00 to 27-JUL-14 21:40:00 (EST-5)
Location: GRATERFORD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm knocked down large tree limbs in Graterford (Perkiomen Township).

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 27-JUL-14 21:50:00 to 27-JUL-14 21:50:00 (EST-5)
Location: FRANCONIA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm knocked down a few large tree limbs and a tree in Franconia Township.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 27-JUL-14 22:29:00 to 27-JUL-14 22:29:00 (EST-5)
Location: MARKHAM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm knocked down a few trees and large tree limbs in Concord Township. Some roadways were blocked by downed trees.