Very similar to the prior day, a hot and humid air mass was present over the mid-Atlantic on August 11. A lee side surface trough over Pennsylvania again allowed thunderstorms to develop near peak heating. With plenty of instability present and storms taking on some degree of organization, a number of instances of damaging wind occurred as storms moved eastward.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 11-AUG-21 17:32:00 to 11-AUG-21 17:32:00 (EST-5)
Location: OLEY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were downed in Oley Twp on Water St. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 11-AUG-21 17:48:00 to 11-AUG-21 17:48:00 (EST-5)
Location: CEDARVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed and blocked Sheephill Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 11-AUG-21 18:06:00 to 11-AUG-21 18:06:00 (EST-5)
Location: CHATWOOD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A downed tree blocked Route 3 along the West Chester Pike near Westtown Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 11-AUG-21 18:14:00 to 11-AUG-21 18:14:00 (EST-5)
Location: JEFFERSONVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed on top of wires and blocking the street at Galbraith Ave and West Main St. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 11-AUG-21 17:48:00 to 11-AUG-21 17:48:00 (EST-5)
Location: CEDARVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires blocked River Rd. The tree fell on an unoccupied parked vehicle. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 11-AUG-21 18:15:00 to 11-AUG-21 18:15:00 (EST-5)
Location: SUGARTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed in the roadway on Goshen Rd. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 11-AUG-21 18:34:00 to 11-AUG-21 18:34:00 (EST-5)
Location: MOYLAN ROSE VLY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A tree was downed on US-30. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 11-AUG-21 18:10:00 to 11-AUG-21 18:10:00 (EST-5)
Location: DUBLIN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

There were a few reports of power outages due to tree damage in the Dublin area, including near Irish Meetinghouse Rd. Likely associated with outflow winds. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 11-AUG-21 18:35:00 to 11-AUG-21 18:35:00 (EST-5)
Location: MOORE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

A large tree was downed on a resident's deck. Report via social media with a photo. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 11-AUG-21 17:10:00 to 11-AUG-21 17:10:00 (EST-5)
Location: SPRINGMONT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed onto wires on Jefferson Ave in Spring Twp. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 11-AUG-21 17:08:00 to 11-AUG-21 17:08:00 (EST-5)
Location: WYOMISSING JCT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Half of a large maple tree was downed onto a road. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 11-AUG-21 17:30:00 to 11-AUG-21 17:30:00 (EST-5)
Location: BASKET
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed near the intersection of Victoria Ln and Bull Rd. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 11-AUG-21 18:33:00 to 11-AUG-21 18:33:00 (EST-5)
Location: ASTON MILLS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple large trees were downed.