A weak cold front dissipated west of the mid-Atlantic on June 4. However, a lingering surface trough slowly moved through the region. With a lingering warm and moist air mass in place, the surface trough caused convection to develop, starting early in the afternoon. Despite weak wind shear, storms steadily increased in organization, aided by favorable mesoscale interactions. Several storms would go on to pose a threat for damaging winds and hail. Storms eventually coalesced into multiple linear segments which posed a continued wind damage threat. Storms moved offshore by early to mid evening, with a drier air mass behind them.

Hail in BUCKS, PENNSYLVANIA
From 04-JUN-21 13:35:00 to 04-JUN-21 13:35:00 (EST-5)
Location: CHALFONT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 14:19:00 to 04-JUN-21 14:19:00 (EST-5)
Location: NORRISTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A couple of downed trees and wires were reported in Norristown. Time estimated from radar.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 04-JUN-21 15:06:00 to 04-JUN-21 15:06:00 (EST-5)
Location: WAYNE JCT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Wires were downed near Clearfield St. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 04-JUN-21 14:12:00 to 04-JUN-21 14:12:00 (EST-5)
Location: MONTELLO
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tree limbs were downed on Wires near Ruth St. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 04-JUN-21 14:48:00 to 04-JUN-21 14:48:00 (EST-5)
Location: LEVITTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree or limbs downed onto wires with a power outage on Whitewood Dr. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 14:32:00 to 04-JUN-21 14:32:00 (EST-5)
Location: AMBLER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A couple of emergency services calls were made for downed trees and/or wires in Upper Dublin Twp. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 04-JUN-21 13:54:00 to 04-JUN-21 13:54:00 (EST-5)
Location: WHITFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Downed utility on State Hill Rd near Keiser Blvd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 13:02:00 to 04-JUN-21 13:02:00 (EST-5)
Location: GREEN LANE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A large tree was blown down near the intersection of Upper Ridge Rd and Green St. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 14:26:00 to 04-JUN-21 14:26:00 (EST-5)
Location: FT WASHINGTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed near the intersection of Morris Rd and Beech Rd. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 04-JUN-21 13:21:00 to 04-JUN-21 13:21:00 (EST-5)
Location: COOPERSBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree was downed into wires near State Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 14:01:00 to 04-JUN-21 14:01:00 (EST-5)
Location: GRATERFORD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Hudnut Rd near Skippack Pike. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 13:41:00 to 04-JUN-21 13:41:00 (EST-5)
Location: SASSAMANSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Deep Creek Rd near Erb Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 14:29:00 to 04-JUN-21 14:29:00 (EST-5)
Location: FLOURTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A downed tree limb blocked Valley View Rd near Parkside Rd. Time estimated from radar.

Hail in BERKS, PENNSYLVANIA
From 04-JUN-21 13:13:00 to 04-JUN-21 13:13:00 (EST-5)
Location: LOBACHSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An mPing report of quarter size hail.

Hail in BUCKS, PENNSYLVANIA
From 04-JUN-21 13:40:00 to 04-JUN-21 13:40:00 (EST-5)
Location: NEW BRITAIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BUCKS, PENNSYLVANIA
From 04-JUN-21 13:30:00 to 04-JUN-21 13:30:00 (EST-5)
Location: SILVERDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 04-JUN-21 12:30:00 to 04-JUN-21 12:30:00 (EST-5)
Location: BOSSARDSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

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

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 04-JUN-21 14:05:00 to 04-JUN-21 14:05:00 (EST-5)
Location: WYOMISSING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Downed trees or limbs caused a power outage near Harding Ave. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 04-JUN-21 13:31:00 to 04-JUN-21 13:31:00 (EST-5)
Location: SHANESVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed on a vehicle on Long Lane Rd. Time estimated from radar and dispatch report.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 04-JUN-21 12:30:00 to 04-JUN-21 12:30:00 (EST-5)
Location: STONY RUN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree was downed onto wires on Stagecoach Rd. Time estimated from radar.

Hail in PHILADELPHIA, PENNSYLVANIA
From 04-JUN-21 15:04:00 to 04-JUN-21 15:04:00 (EST-5)
Location: WEST PHILADELPHIA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An mPing report of half dollar size hail.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 04-JUN-21 12:04:00 to 04-JUN-21 12:04:00 (EST-5)
Location: POCONO PINES
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A couple reports of downed tree limbs and wires on the north side of Pocono Pines. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 14:30:00 to 04-JUN-21 14:30:00 (EST-5)
Location: LAFAYETTE HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A couple of trees were downed in Whitemarsh Twp. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 04-JUN-21 14:31:00 to 04-JUN-21 14:31:00 (EST-5)
Location: ERDENHEIM
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tree limbs and wires were downed near Harston Ln. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 04-JUN-21 14:56:00 to 04-JUN-21 14:56:00 (EST-5)
Location: ANDALUSIA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A social media report of downed tree limbs and pea size hail. Time estimated from radar.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 04-JUN-21 12:53:00 to 04-JUN-21 12:53:00 (EST-5)
Location: DELEWARE WATER GAP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Reports of tree damage and wires down near Delaware Water Gap. Time estimated from radar.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 04-JUN-21 12:34:00 to 04-JUN-21 12:34:00 (EST-5)
Location: STROUDSBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Several reports of downed tree limbs and wires in the Stroudsburg and East Stroudsburg areas. Time estimated from radar.

Hail in PHILADELPHIA, PENNSYLVANIA
From 04-JUN-21 14:58:00 to 04-JUN-21 14:58:00 (EST-5)
Location: BYBERRY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter