A cold front moved through the mid-Atlantic on September 23. The environment ahead of the front was weakly to moderately unstable, with instability limited by cloud cover and seasonally weaker daytime heating versus the deep summer. Still, frontal forcing and moderate wind shear allowed a band of widespread showers and thunderstorms to develop ahead of the front. With fairly strong wind fields in place, storms became strong to severe at times, producing areas of damaging wind. Convection continued shifting east into the evening as the front made its way towards the Atlantic coast.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 23-SEP-21 11:37:00 to 23-SEP-21 11:37:00 (EST-5)
Location: GARRETT HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tree limbs and wires were downed near Wyldhaven Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 23-SEP-21 11:40:00 to 23-SEP-21 11:40:00 (EST-5)
Location: EVANSBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Tree limbs were downed near River Rd and Germantown Pike in Upper Providence Twp. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 23-SEP-21 11:31:00 to 23-SEP-21 11:31:00 (EST-5)
Location: BERWYN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A downed tree blocked Conestoga Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 23-SEP-21 11:38:00 to 23-SEP-21 11:38:00 (EST-5)
Location: MARBLE HALL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An mPing report of tree damage at this location. Time confirmed from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 23-SEP-21 11:25:00 to 23-SEP-21 11:25:00 (EST-5)
Location: PAOLI
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Darby Paoli Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 23-SEP-21 11:28:00 to 23-SEP-21 11:28:00 (EST-5)
Location: BERWYN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Wires were downed on Margo Ln. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 23-SEP-21 11:49:00 to 23-SEP-21 11:49:00 (EST-5)
Location: BELFRY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tree limbs and wires were downed near Mauck Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 23-SEP-21 11:46:00 to 23-SEP-21 11:46:00 (EST-5)
Location: MARBLE HALL
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Several reports of power lines down in the Conshohocken and Plymouth Meeting areas. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 23-SEP-21 11:31:00 to 23-SEP-21 11:31:00 (EST-5)
Location: KIMBERTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A downed tree blocked Hares Hill Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 23-SEP-21 11:14:00 to 23-SEP-21 11:14:00 (EST-5)
Location: WEST CHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree and wires were downed on Conner Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 23-SEP-21 11:49:00 to 23-SEP-21 11:49:00 (EST-5)
Location: BLUE BELL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed near the intersection of Boxwood Ln and Hemlock Dr. Time estimated from radar.