A cold front and associated weak area of surface low pressure approached the mid-Atlantic on June 14. A seasonably warm air mass was present ahead of the front, allowing a moderate amount of instability to build over the mid-Atlantic. Moderate to strong wind shear was also present thanks to the presence of a robust upper level disturbance approaching the region. This disturbance, along with the front, provided sufficient forcing for scattered to widespread convection to develop in the interior mid-Atlantic and propagate towards the coast. Some storms became strong to severe in the rather favorable convective environment, posing a primary risk of damaging winds along with some hail. Convection also continued well into the overnight over portions of the area thanks to the good shear and forcing, with convection eventually moving offshore in the pre-dawn hours of the 15th.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 14-JUN-21 19:16:00 to 14-JUN-21 19:16:00 (EST-5)
Location: NORRISTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Tree limbs were downed near Depot St. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 14-JUN-21 19:55:00 to 14-JUN-21 19:55:00 (EST-5)
Location: PHILMONT COUNTRY CLU
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

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

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 14-JUN-21 20:02:00 to 14-JUN-21 20:02:00 (EST-5)
Location: TACONY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An mPing report of large tree limbs or power lines down. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 14-JUN-21 19:12:00 to 14-JUN-21 19:12:00 (EST-5)
Location: GENERAL WARREN VLG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were downed near Route 202 in Malvern. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 14-JUN-21 19:00:00 to 14-JUN-21 19:00:00 (EST-5)
Location: HARMONY HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A tree was downed on Sugars Bridge Rd near Alton. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 14-JUN-21 18:55:00 to 14-JUN-21 18:55:00 (EST-5)
Location: DOWNINGTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Old Kings Hwy. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 14-JUN-21 19:39:00 to 14-JUN-21 19:39:00 (EST-5)
Location: OVERBROOK HILLS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Downed tree limbs blocked Haverford Rd near Remington Rd. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 14-JUN-21 20:05:00 to 14-JUN-21 20:05:00 (EST-5)
Location: BROOKHAVEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A few trees were reported down in the area of Bridgewater Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 14-JUN-21 19:25:00 to 14-JUN-21 19:25:00 (EST-5)
Location: ERDENHEIM
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed on Montgomery Ave. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 14-JUN-21 20:06:00 to 14-JUN-21 20:06:00 (EST-5)
Location: CHESTER HGTS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

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

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 14-JUN-21 17:47:00 to 14-JUN-21 17:47:00 (EST-5)
Location: FIVE PTS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Apple Ln. Time estimated from radar.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 14-JUN-21 20:00:00 to 14-JUN-21 20:00:00 (EST-5)
Location: CRESCENTVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Wires were downed due to strong winds. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 14-JUN-21 19:25:00 to 14-JUN-21 19:25:00 (EST-5)
Location: NEWTON SQUARE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Downed trees caused a power outage. Time estimated from radar.

Hail in DELAWARE, PENNSYLVANIA
From 14-JUN-21 19:37:00 to 14-JUN-21 19:37:00 (EST-5)
Location: BROOMALL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An mPing report of penny size hail.

Hail in DELAWARE, PENNSYLVANIA
From 14-JUN-21 19:38:00 to 14-JUN-21 19:38:00 (EST-5)
Location: FOXCROFT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An mPing report of penny size hail.

Thunderstorm Wind in MONROE, PENNSYLVANIA
From 14-JUN-21 16:05:00 to 14-JUN-21 16:05:00 (EST-5)
Location: ROBIN HOOD LAKES
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wires were reported down in the area of Robinhood Lakes.

Hail in DELAWARE, PENNSYLVANIA
From 14-JUN-21 19:40:00 to 14-JUN-21 19:40:00 (EST-5)
Location: PRIMOS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public