A stalled frontal boundary shifted slightly north as a warm front on the morning of June 28. Later in the day, a weak wave of low pressure traveled along this boundary. With a warm and humid air mass in place near and south of the front, showers and thunderstorms developed, with some storms becoming severe.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 28-JUN-19 15:44:00 to 28-JUN-19 15:44:00 (EST-5)
Location: GERMANSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was split in two near the base. Time estimated from radar.

Hail in BERKS, PENNSYLVANIA
From 28-JUN-19 16:42:00 to 28-JUN-19 16:42:00 (EST-5)
Location: YELLOW HOUSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported at the intersection of Covered Bridge Rd and Memorial Hwy in Oley Twp.

Hail in MONTGOMERY, PENNSYLVANIA
From 28-JUN-19 17:58:00 to 28-JUN-19 17:58:00 (EST-5)
Location: COLLEGEVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 28-JUN-19 16:19:00 to 28-JUN-19 16:19:00 (EST-5)
Location: FULLERTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Several reports were received of trees down. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 28-JUN-19 16:29:00 to 28-JUN-19 16:29:00 (EST-5)
Location: FREIDENSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An mPing report of tree limbs blown down at this location. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 28-JUN-19 16:33:00 to 28-JUN-19 16:33:00 (EST-5)
Location: FREIDENSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Power lines came down near the intersection of Old Bethlehem Pike and Saucon Drive. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 28-JUN-19 16:33:00 to 28-JUN-19 16:33:00 (EST-5)
Location: WESTGATE HILLS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree fell onto wires with a transformer fire. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 28-JUN-19 16:45:00 to 28-JUN-19 16:45:00 (EST-5)
Location: HELLERTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few tree limbs were down with wind gusts estimated at 50 to 60mph. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 28-JUN-19 16:49:00 to 28-JUN-19 16:49:00 (EST-5)
Location: PINE FORGE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A downed tree was reported at the intersection of Douglass Dr and Pine Forge Rd. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 28-JUN-19 16:52:00 to 28-JUN-19 16:52:00 (EST-5)
Location: GREISEMERSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was reported down at the intersection of Blacksmith Rd and Hunter Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 28-JUN-19 17:52:00 to 28-JUN-19 17:52:00 (EST-5)
Location: COLLEGEVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree fell on wires and blocked the entire road on West Third Ave near Chestnut St. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 28-JUN-19 17:55:00 to 28-JUN-19 17:55:00 (EST-5)
Location: COLLEGEVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Several trees were reported down near 9th Ave and Main St. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 28-JUN-19 17:56:00 to 28-JUN-19 17:56:00 (EST-5)
Location: AUDUBON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A downed tree blocked Germantown Pike in both directions between Grange Ave and RDG Pike. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 28-JUN-19 17:55:00 to 28-JUN-19 17:55:00 (EST-5)
Location: PROVIDENCE SQUARE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous trees were downed south of Evansburg. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 28-JUN-19 18:14:00 to 28-JUN-19 18:14:00 (EST-5)
Location: AUDUBON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large hardwood tree was uprooted near Eagleville, PA. Time estimated from radar.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 28-JUN-19 18:19:00 to 28-JUN-19 18:19:00 (EST-5)
Location: PHILADELPHIA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Social media video of two trees blown down during the storm on South Broad St. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 28-JUN-19 16:17:00 to 28-JUN-19 16:17:00 (EST-5)
Location: (ABE)LEHIGH VALLEY INTERNATIONAL AIRPORT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Lehigh Valley International Airport ASOS (KABE) reported a 50 kt wind gust.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 28-JUN-19 17:55:00 to 28-JUN-19 17:55:00 (EST-5)
Location: COLLEGEVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter estimated 65 to 70mph wind gusts with pea size hail.