A hot and humid air mass was in place over the mid-Atlantic on August 10. A lee side surface trough was present over central Pennsylvania. This provided sufficient lift for thunderstorms to develop in the unstable air mass, and some organization into multi-cellular or linear clusters occurred. Despite limited shear, the strong instability allowed a number of storms to become strong to severe, producing damaging wind.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 10-AUG-21 19:30:00 to 10-AUG-21 19:30:00 (EST-5)
Location: BRIARCLIFF
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree and wires were downed near the intersection of Bishop Ave and Broadway Ave. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 10-AUG-21 19:25:00 to 10-AUG-21 19:25:00 (EST-5)
Location: RUTLEDGE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree and wires were downed near the intersection of Rutgers Ave at Harvard Ave. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 18:58:00 to 10-AUG-21 18:58:00 (EST-5)
Location: WEST CHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was downed onto wires near the intersection of Sunset Hollow Rd and Grove Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 19:18:00 to 10-AUG-21 19:18:00 (EST-5)
Location: KAOLIN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A downed tree partially blocked Reynolds Rd near Spring Benny Run. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 10-AUG-21 19:20:00 to 10-AUG-21 19:20:00 (EST-5)
Location: THORNTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Downed tree limbs blocked Brintons Bridge Rd at Dilworthtown Rd. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 10-AUG-21 14:33:00 to 10-AUG-21 14:33:00 (EST-5)
Location: STRAUSSTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was downed on Route 183. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 10-AUG-21 15:25:00 to 10-AUG-21 15:25:00 (EST-5)
Location: SHANESVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was downed on Long Lane Rd. Likely associated with outflow winds.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 10-AUG-21 19:27:00 to 10-AUG-21 19:27:00 (EST-5)
Location: WOODLYN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree and wires were downed near Eisenhower Ave at Catherine Ave. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 19:17:00 to 10-AUG-21 19:17:00 (EST-5)
Location: KENNETT SQUARE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Downed tree limbs blocked most of Unionville Rd at Gatehouse Dr. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 19:15:00 to 10-AUG-21 19:15:00 (EST-5)
Location: KAOLIN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A downed tree blocked all of Egypt Run Rd near Newark Rd. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 10-AUG-21 19:26:00 to 10-AUG-21 19:26:00 (EST-5)
Location: FOLCROFT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed on Academy Ave near Glen Circle. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 10-AUG-21 17:05:00 to 10-AUG-21 17:05:00 (EST-5)
Location: STANWOOD GARDENS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few shingles were blown off along with two inch diameter limbs. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 19:22:00 to 10-AUG-21 19:22:00 (EST-5)
Location: CEDAR HOLLOW STATION
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Tree limbs and other storm debris were downed onto Lancaster Ave at Woodview Dr. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 18:52:00 to 10-AUG-21 18:52:00 (EST-5)
Location: OXFORD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A downed tree blocked the southbound US-1 ramp onto PA-472. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 19:10:00 to 10-AUG-21 19:10:00 (EST-5)
Location: AVONDALE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Downed wires blocked Pomeroy Ave at State St. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 10-AUG-21 15:15:00 to 10-AUG-21 15:15:00 (EST-5)
Location: SIGMUND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tree limbs were downed on wires near Sheeprock Rd. Likely associated with outflow winds. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 10-AUG-21 15:12:00 to 10-AUG-21 15:12:00 (EST-5)
Location: GIBRALTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

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

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 10-AUG-21 15:35:00 to 10-AUG-21 15:35:00 (EST-5)
Location: EMMAUS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

County dispatch reported about 5 instances of downed trees and limbs over the southern portion of Lehigh County. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 10-AUG-21 16:00:00 to 10-AUG-21 16:00:00 (EST-5)
Location: SOUTH EASTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

There were a few reports of downed trees and power outages near Easton. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 18:55:00 to 10-AUG-21 18:55:00 (EST-5)
Location: DOWNINGTOWN MEML ARP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A downed tree blocked the roadway near the intersection of Harvest Dr and Ingleside Dr. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 10-AUG-21 19:13:00 to 10-AUG-21 19:13:00 (EST-5)
Location: GLENOLDEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees and wires were downed on Springhill Rd. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 10-AUG-21 19:03:00 to 10-AUG-21 19:03:00 (EST-5)
Location: BROOKHAVEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree and wires were downed on Susan Ln near Arlington Ave. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 10-AUG-21 18:47:00 to 10-AUG-21 18:47:00 (EST-5)
Location: DOE RUN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees and wires were downed on Doe Run Rd. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 10-AUG-21 19:05:00 to 10-AUG-21 19:05:00 (EST-5)
Location: RIDLEY PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree and wires were downed near Sellers Ave at Industrial Hwy. Time estimated from radar.