A warm front moved through the mid-Atlantic on the morning of April 9. During the late morning and early afternoon, the mid-Atlantic was in a narrow warm sector with a cold front quickly approaching from the west as low pressure tracked through the Great Lakes and then began to redevelop over southern New England. Ahead of the front, a strongly forced and highly sheared environment existed. Heating and moisture were limited in the small warm sector region, but sufficient instability developed to support convective development, and a broken line of showers and thunderstorms moved across the region, causing a considerable amount of wind damage.
That evening, additional severe weather occurred as several post-frontal squalls developed. One of these squalls developed into a low-topped thunderstorm. Steep lapse rates and strong wind profiles allowed this storm to also produce wind damage over southeastern Pennsylvania, northeast Maryland, northern Delaware, and southern New Jersey.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 09-APR-20 11:48:00 to 09-APR-20 11:48:00 (EST-5)
Location: GREEN LANE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and wires downed in the area. Pea size hail also reported.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-APR-20 11:50:00 to 09-APR-20 11:50:00 (EST-5)
Location: PHOENIXVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was downed near Township Line Rd and Nutt Rd.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 09-APR-20 11:54:00 to 09-APR-20 11:54:00 (EST-5)
Location: SELLERSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Several reports of downed trees and wires in the area. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 09-APR-20 12:00:00 to 09-APR-20 12:00:00 (EST-5)
Location: AUDUBON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was downed on a house in Lower Providence Twp.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 09-APR-20 12:29:00 to 09-APR-20 12:29:00 (EST-5)
Location: (PHL)PHILADELPHIA IN
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Measured by ITWS at Philadelphia International Airport.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-APR-20 12:05:00 to 09-APR-20 12:05:00 (EST-5)
Location: READING
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A video posted to social media from downtown Reading showed numerous trees uprooted and downed, as well as numerous downed power lines. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 09-APR-20 12:15:00 to 09-APR-20 12:15:00 (EST-5)
Location: PENNS PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An outdoor shed was significantly damaged. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-APR-20 12:13:00 to 09-APR-20 12:13:00 (EST-5)
Location: TOPTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was uprooted and blocked a roadway. Power lines were also downed. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-APR-20 11:40:00 to 09-APR-20 11:40:00 (EST-5)
Location: NEW BERLINVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An mPing report of wind damage.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 09-APR-20 12:18:00 to 09-APR-20 12:18:00 (EST-5)
Location: RICHBORO
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Two large trees uprooted in Richboro. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 09-APR-20 12:18:00 to 09-APR-20 12:18:00 (EST-5)
Location: WASHINGTON CROSSING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree was uprooted. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 09-APR-20 12:20:00 to 09-APR-20 12:20:00 (EST-5)
Location: WOODLYN
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Broadcast Media

A tree fell onto a house in Woodlyn. Time estimated from radar.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 09-APR-20 12:24:00 to 09-APR-20 12:24:00 (EST-5)
Location: BUSTLETON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree was snapped in half in Bells Corner. Time estimated from radar.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 09-APR-20 12:29:00 to 09-APR-20 12:29:00 (EST-5)
Location: (PHL)PHILADELPHIA IN
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Philadelphia International Airport.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-APR-20 22:45:00 to 09-APR-20 22:45:00 (EST-5)
Location: CHATHAM
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-APR-20 22:35:00 to 09-APR-20 22:35:00 (EST-5)
Location: OXFORD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed near the intersection of Mount Pleasant Rd and Grant St. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-APR-20 22:40:00 to 09-APR-20 22:40:00 (EST-5)
Location: HICKORY HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A tree was downed on PA-472. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-APR-20 22:50:00 to 09-APR-20 22:50:00 (EST-5)
Location: LANDENBERG
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Several reports of downed trees and power lines in the West Grove and Landenberg areas. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-APR-20 22:52:00 to 09-APR-20 22:52:00 (EST-5)
Location: LANDENBERG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Wires were downed near the intersection of Chesterville Rd and Penn Green Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 09-APR-20 22:52:00 to 09-APR-20 22:52:00 (EST-5)
Location: LANDENBERG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was downed on Laurel Heights Rd. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-APR-20 11:10:00 to 09-APR-20 11:10:00 (EST-5)
Location: WERNERSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Several reports of downed trees and wires in the area. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 09-APR-20 11:21:00 to 09-APR-20 11:21:00 (EST-5)
Location: EMERALD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Several reports of downed trees and wires in the area. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-APR-20 11:24:00 to 09-APR-20 11:24:00 (EST-5)
Location: READING
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Photos of several large trees down in the area. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 09-APR-20 11:37:00 to 09-APR-20 11:37:00 (EST-5)
Location: PROSPECT HGTS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Several reports of downed trees and wires in the area. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 09-APR-20 11:42:00 to 09-APR-20 11:42:00 (EST-5)
Location: BOYERTOWN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A utility pole was snapped in half in Boyertown. Time estimated from radar.