A cold front moved through the Great Lakes region on June 21, while Tropical Storm Claudette passed offshore of New Jersey and the Delmarva region. Ahead of the cold front, a hot, humid, and unstable air mass developed in the mid-Atlantic. A pre-frontal trough then served as a focus for widespread convection across the Northeast and mid-Atlantic during the afternoon and evening hours. With the strong instability and good forcing, much of the convection became strong to severe, taking the form of both linear and semi-discrete activity. Damaging winds were by far the primary hazard with these storms, with numerous reports of downed trees and power lines across the region. Convection weakened as it approached the coast owing to loss of daytime heating, weakening shear, and large scale subsidence on the northwest flank of Claudette.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 18:00:00 to 21-JUN-21 18:00:00 (EST-5)
Location: REECEVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Multiple reports of downed trees and wires in East Brandywine Twp. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 17:54:00 to 21-JUN-21 17:54:00 (EST-5)
Location: NEW GARDEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A few reports of trees and wires down in New Garden Twp. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 21-JUN-21 18:09:00 to 21-JUN-21 18:09:00 (EST-5)
Location: WALNUTTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree and wires were downed. Time estimated from radar.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 21-JUN-21 18:50:00 to 21-JUN-21 18:50:00 (EST-5)
Location: LEHIGH GAP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree and wires were reported down. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 21-JUN-21 18:45:00 to 21-JUN-21 18:45:00 (EST-5)
Location: EAST PENN JCT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A few reports of downed wires were received from in and near Allentown. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 21-JUN-21 17:48:00 to 21-JUN-21 17:48:00 (EST-5)
Location: ROBESONIA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree and wires were downed. Time estimated from radar.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 21-JUN-21 18:29:00 to 21-JUN-21 18:29:00 (EST-5)
Location: JIM THORPE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree and wires were downed. Time estimated from radar.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 21-JUN-21 18:47:00 to 21-JUN-21 18:47:00 (EST-5)
Location: PRESERVE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Locust Ridge Rd. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 21-JUN-21 18:45:00 to 21-JUN-21 18:45:00 (EST-5)
Location: LAURYS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Power lines were downed near Neffs Laurys Rd. Time estimated from radar.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 21-JUN-21 18:31:00 to 21-JUN-21 18:31:00 (EST-5)
Location: NESQUEHONING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A tree was downed into wires near Lentz Trail and Flagstaff Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 18:07:00 to 21-JUN-21 18:07:00 (EST-5)
Location: GENERAL WARREN VLG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Mill Ln. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 18:40:00 to 21-JUN-21 18:40:00 (EST-5)
Location: WIND GAP
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

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

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 17:58:00 to 21-JUN-21 17:58:00 (EST-5)
Location: LIONVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree, wires, and a power pole were downed on a residence near Forge Ln. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 19:10:00 to 21-JUN-21 19:10:00 (EST-5)
Location: MT BETHEL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Wires were reported down along River Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 17:41:00 to 21-JUN-21 17:41:00 (EST-5)
Location: PARKESBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Limestone Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 17:58:00 to 21-JUN-21 17:58:00 (EST-5)
Location: FIVE PTS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Trees were downed on Creek Rd. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 19:22:00 to 21-JUN-21 19:22:00 (EST-5)
Location: FLICKSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A tree was downed into wires near the intersection of Miller Rd and Richmond Rd. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 18:25:00 to 21-JUN-21 18:25:00 (EST-5)
Location: SLATINGTON ARPT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Wires were reported down. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 21-JUN-21 18:45:00 to 21-JUN-21 18:45:00 (EST-5)
Location: EMERALD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Grant St. Time estimated from radar.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 21-JUN-21 18:52:00 to 21-JUN-21 18:52:00 (EST-5)
Location: ANALOMINK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Hallet Rd. Time estimated from radar.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 21-JUN-21 18:58:00 to 21-JUN-21 18:58:00 (EST-5)
Location: SUN VLY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Toll Rd. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 19:10:00 to 21-JUN-21 19:10:00 (EST-5)
Location: BANGOR
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: State Official

Numerous reports of downed trees and wires were received from the area of Bangor and Washington Twp. One residential property in particular on Washington Blvd suffered numerous downed trees and some property damage. Analysis of damage photos and radar data suggests a microburst likely occurred in the area. Winds of up to 80 mph are estimated. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 18:13:00 to 21-JUN-21 18:13:00 (EST-5)
Location: CEDAR HOLLOW STATION
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Valley Rd. Time estimated from radar.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 21-JUN-21 18:29:00 to 21-JUN-21 18:29:00 (EST-5)
Location: JIM THORPE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree and wires were downed on Main St in Jim Thorpe. Time estimated from radar.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 21-JUN-21 18:30:00 to 21-JUN-21 18:30:00 (EST-5)
Location: ROCKPORT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree and wires were downed on Sparrow Ln. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 21-JUN-21 18:30:00 to 21-JUN-21 18:30:00 (EST-5)
Location: LEHIGH FURNACE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree and wires were reported down. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 19:12:00 to 21-JUN-21 19:12:00 (EST-5)
Location: FLICKSVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

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

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 21-JUN-21 17:46:00 to 21-JUN-21 17:46:00 (EST-5)
Location: REHRERSBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Several reports of downed power lines in the area. Time estimated from radar.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 21-JUN-21 18:43:00 to 21-JUN-21 18:43:00 (EST-5)
Location: SNYDERSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Rimrock Rd. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 21-JUN-21 17:26:00 to 21-JUN-21 17:26:00 (EST-5)
Location: ALBANY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Hawk Mountain Rd. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 18:54:00 to 21-JUN-21 18:54:00 (EST-5)
Location: PT PHILLIP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Mountain Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 17:54:00 to 21-JUN-21 17:54:00 (EST-5)
Location: TOUGHKENAMON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree was downed on Newark Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 18:13:00 to 21-JUN-21 18:13:00 (EST-5)
Location: WHITEHOUSE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

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

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 17:58:00 to 21-JUN-21 17:58:00 (EST-5)
Location: GREEN HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Boot Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 17:45:00 to 21-JUN-21 17:45:00 (EST-5)
Location: SADSBURYVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree and wires were downed. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 19:15:00 to 21-JUN-21 19:15:00 (EST-5)
Location: FLICKSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Power lines were downed near Deer Run Rd. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 21-JUN-21 18:54:00 to 21-JUN-21 18:54:00 (EST-5)
Location: DELPS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Power lines were downed near Derhammer Rd. Time estimated from radar.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 21-JUN-21 18:45:00 to 21-JUN-21 18:45:00 (EST-5)
Location: PHILADELPHIA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few trees were reported down in the Bella Vista area of Philadelphia. Time estimated from radar.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 21-JUN-21 19:05:00 to 21-JUN-21 19:05:00 (EST-5)
Location: MC MICHAELS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Wiltshire Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 18:02:00 to 21-JUN-21 18:02:00 (EST-5)
Location: DOWNINGTOWN MEML ARP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Tree limbs were down on Edge Ln. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 21-JUN-21 18:02:00 to 21-JUN-21 18:02:00 (EST-5)
Location: ST PETERS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Outflow winds downed trees and wires near Hill Rd. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 21-JUN-21 18:05:00 to 21-JUN-21 18:05:00 (EST-5)
Location: ALSACE MANOR
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Kegerise Dr. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 21-JUN-21 18:19:00 to 21-JUN-21 18:19:00 (EST-5)
Location: EDENBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Blue Rocks Rd. Time estimated from radar.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 21-JUN-21 18:40:00 to 21-JUN-21 18:40:00 (EST-5)
Location: LEHIGH GAP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Alley F and Park Ln. Time estimated from radar.

Thunderstorm Wind in CARBON, PENNSYLVANIA
From 21-JUN-21 18:33:00 to 21-JUN-21 18:33:00 (EST-5)
Location: LAKE HARMONY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed in the Pocono Mountain Lake Estates area. Time estimated from radar.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 21-JUN-21 18:58:00 to 21-JUN-21 18:58:00 (EST-5)
Location: CANADENSIS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Route 447. Time estimated from radar.