A strong cold front moved through the mid-Atlantic on July 21. Ahead of the front, an environment of moderate wind shear and seasonably warm and humid conditions promoted widespread thunderstorm development. Storms mainly took the form of multi-cell clusters and quasi-linear segments. A number of storms became severe, posing a threat for both damaging winds and, thanks to cold air aloft, large hail as they moved towards the coast. With the front moving through during the mid to late afternoon hours, most of the storm activity was offshore by early evening, with cooler and drier weather behind the front.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 21-JUL-21 14:40:00 to 21-JUL-21 14:40:00 (EST-5)
Location: TRAINER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed on Carter Ave in Chester Twp. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:20:00 to 21-JUL-21 14:20:00 (EST-5)
Location: FT WASHINGTON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees were downed near the PA Turnpike.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 21-JUL-21 14:45:00 to 21-JUL-21 14:45:00 (EST-5)
Location: TACONY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees were downed near Vogt Recreation Center in Tacony. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:10:00 to 21-JUL-21 14:10:00 (EST-5)
Location: BLUE BELL
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Numerous trees down on wires in Whitpain Twp in association with a microburst. Time estimated from radar.

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:10:00 to 21-JUL-21 14:10:00 (EST-5)
Location: MARBLE HALL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 13:50:00 to 21-JUL-21 13:50:00 (EST-5)
Location: SCHWENKSVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:30:00 to 21-JUL-21 14:30:00 (EST-5)
Location: ARDSLEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:30:00 to 21-JUL-21 14:30:00 (EST-5)
Location: BAEDERWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:15:00 to 21-JUL-21 14:15:00 (EST-5)
Location: BLUE BELL
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Photos relayed on social media of hail slightly larger than quarter size. Time estimated from radar.

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:25:00 to 21-JUL-21 14:25:00 (EST-5)
Location: ORELAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Report via social media with photo. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 21-JUL-21 13:15:00 to 21-JUL-21 13:15:00 (EST-5)
Location: ALLENTOWN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Widespread tree damage was reported in West Allentown.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 21-JUL-21 14:40:00 to 21-JUL-21 14:40:00 (EST-5)
Location: FOX CHASE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees were downed on wires on Stanwood St in Rhawnhurst.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:07:00 to 21-JUL-21 14:07:00 (EST-5)
Location: WEST PT
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Photo of a large tree down in Upper Gwynedd Twp. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:15:00 to 21-JUL-21 14:15:00 (EST-5)
Location: BELFRY
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous photos of large tree limbs down in the Center Square area of Blue Bell. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 21-JUL-21 13:20:00 to 21-JUL-21 13:20:00 (EST-5)
Location: SPRINGMONT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Photo of large tree branches down on wires in West Lawn PA. Time estimated by spotter.

Hail in BERKS, PENNSYLVANIA
From 21-JUL-21 13:00:00 to 21-JUL-21 13:00:00 (EST-5)
Location: MUHLENBERG PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:05:00 to 21-JUL-21 14:05:00 (EST-5)
Location: HARTRANFT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:30:00 to 21-JUL-21 14:30:00 (EST-5)
Location: OGONTZ
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:11:00 to 21-JUL-21 14:11:00 (EST-5)
Location: PLYMOUTH VLY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:28:00 to 21-JUL-21 14:28:00 (EST-5)
Location: BAEDERWOOD
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree was sheared apart in Abington Twp. Report via social media with a photo. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 21-JUL-21 13:20:00 to 21-JUL-21 13:20:00 (EST-5)
Location: SUMMIT LAWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Wires were downed south of Allentown. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 21-JUL-21 14:05:00 to 21-JUL-21 14:05:00 (EST-5)
Location: HARTRANFT
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Numerous trees were downed in association with a strong microburst.

Hail in LEHIGH, PENNSYLVANIA
From 21-JUL-21 13:05:00 to 21-JUL-21 13:05:00 (EST-5)
Location: WOODLAWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter