A complex storm system affected the mid-Atlantic on November 30, 2020. Developing low pressure over the Southeast US began to interact and phase with a clipper system over the Great Lakes, leading to a steadily intensifying low tracking northward along the Appalachians. This would become the primary low pressure system, which moved into Pennsylvania by the afternoon of the 30th. Ahead of the low, a warm front pushed through the mid-Atlantic and brought a period of rain with embedded thunder during the morning and early afternoon. By later in the day, a cold front began to approach. While increasing mid-level dry air was an inhibiting factor, the development of some sunshine after the earlier rain helped some modest instability to develop as surface temperatures rose well above seasonal normal. Combined with strong forcing and very strong wind fields in the narrow warm sector of the intensifying and highly dynamic low, convection developed ahead of the cold front. The combination of these factors led to a spatially limited but considerably impactful severe weather event over portions of eastern Pennsylvania, New Jersey, the Eastern Shore of Maryland, and northern Delaware. A number of instances of damaging wind as well as a couple of tornadoes occurred in the region. This event was also noteworthy in that despite being a late season event, some of the stronger convective elements were comparable in depth to typical mid-summer convection.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:28:00 to 30-NOV-20 15:28:00 (EST-5)
Location: MALVERN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Woodland Dr in Malvern. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:28:00 to 30-NOV-20 15:28:00 (EST-5)
Location: GENERAL WARREN VLG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree and wires were downed near Woodview Rd in Malvern. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:28:00 to 30-NOV-20 15:28:00 (EST-5)
Location: PHOENIXVILLE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Multiple large trees were uprooted in Phoenixville. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:29:00 to 30-NOV-20 15:29:00 (EST-5)
Location: ALDHAM
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree and wires were downed near Hilltop Rd in Charlestown. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 12:49:00 to 30-NOV-20 12:49:00 (EST-5)
Location: CROMBY
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Several trees and limbs were downed near the intersection of Township Line Rd and Mowere Rd. Glass windows were broken. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 30-NOV-20 15:32:00 to 30-NOV-20 15:32:00 (EST-5)
Location: YERKES
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Clahor Ave. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:33:00 to 30-NOV-20 15:33:00 (EST-5)
Location: BERWYN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed near the intersection of Waterloo Rd and Highland Ave. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:33:00 to 30-NOV-20 15:33:00 (EST-5)
Location: PHOENIXVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Several trees were downed on Dawson Dr. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:36:00 to 30-NOV-20 15:36:00 (EST-5)
Location: CROMBY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Freemont St in Phoenixville. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 30-NOV-20 12:52:00 to 30-NOV-20 12:54:00 (EST-5)
Location: TRAPPE
Magnitude: 60.00 EG
Crop damage: 0.00K
Reported by: Public

A damaging wind event started in the area of College
Avenue at Joan Drive around 12:52 PM on November 30, 2020. Various
items of yard and patio furniture were tossed about, and a few trees
were downed or damaged. At least two houses sustained partial losses
of shingles and/or siding, and a couple of fences were destroyed.
About a mile to the northeast, an HVAC unit was blown across the roof
of the Perkiomen Valley Middle School East. A local fire chief reported
several trees uprooted on nearby Wartman Road. It is estimated the
damaging winds ended in this area near or before reaching Bridge Street,
or near Lodal Creek, as no additional damage was reported downstream of
Wartman Road. Radar data indicated a rear-inflow jet descending in the
area resulting in a narrow swath of wind damage, and some resident accounts suggested this may have been a tornado. Howeve, available evidence was not clear regarding a brief
tornado touchdown and therefore the damage is designated as straight-line
wind. We extend our thanks to the local residents who provided accounts
of damage for their assistance in this survey, which was conducted remotely.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 30-NOV-20 15:43:00 to 30-NOV-20 15:43:00 (EST-5)
Location: TRAINER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Wires were downed near Wilson St in South Chester. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 30-NOV-20 15:44:00 to 30-NOV-20 15:44:00 (EST-5)
Location: CRUM CREEK MANOR
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Wires were downed near Pleasant Hill Rd in Garden City. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 30-NOV-20 15:46:00 to 30-NOV-20 15:46:00 (EST-5)
Location: HARLEYSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Maple Ave in Harleysville. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 30-NOV-20 15:44:00 to 30-NOV-20 15:44:00 (EST-5)
Location: SKIPPACK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Tyson Rd in Skippack Twp. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 30-NOV-20 15:44:00 to 30-NOV-20 15:44:00 (EST-5)
Location: LEDERACH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Old Morris Rd in Lederach. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:15:00 to 30-NOV-20 15:15:00 (EST-5)
Location: UNIONVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree and wires were downed near Marlborough Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:15:00 to 30-NOV-20 15:15:00 (EST-5)
Location: HARMONY HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed at the intersection of Skelp Level Rd and Spencer Dr. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 30-NOV-20 15:44:00 to 30-NOV-20 15:44:00 (EST-5)
Location: HIGHLAND PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Gaffney Hill Rd and Texas Rd. Time estimated from radar.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 30-NOV-20 15:47:00 to 30-NOV-20 15:47:00 (EST-5)
Location: OLD ZIONSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree was downed into wires near Oak Ln in Upper Milford Twp. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:19:00 to 30-NOV-20 15:19:00 (EST-5)
Location: HAMORTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on US-1 near PA-52. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:19:00 to 30-NOV-20 15:19:00 (EST-5)
Location: MARSHALLTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A large tree was downed on Lucky Hill Rd. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 30-NOV-20 15:47:00 to 30-NOV-20 15:47:00 (EST-5)
Location: HOPPENVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A tree was downed on Swamp Creek Rd near the Price Rd intersection, closing the road. Time estimated from radar.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 30-NOV-20 15:49:00 to 30-NOV-20 15:49:00 (EST-5)
Location: SPRINGFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree and wires were downed near Overhill Rd in Springfield Twp. Time estimated from radar.

Tornado in MONTGOMERY, PENNSYLVANIA
From 30-NOV-20 15:52:00 to 30-NOV-20 15:53:00 (EST-5)
Location: MONTGOMERYVILLE ARPT
Tornado F-scale: EF0
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF-0 tornado touched down immediately east of the Route 309
(Bethlehem Pike) northbound onramp to the 202 Parkway in
Montgomeryville, PA around 352 PM.  As the tornado crossed the
Parkway, two small trees were uprooted on its northbound side.
Outdoor wooden picnic benches and tables at the Texas Roadhouse
restaurant were picked up and tossed a few hundred feet, breaking
the front window of the nearby but now shuttered Noboru restaurant.
Circulation associated with this tornado then pulled air-handling
equipment from the roof of this restaurant and tore off siding from
the northeastern edge of the building.  Six to eight cars in the
nearby parking lots of both the Texas Roadhouse and Noboru
restaurants were shifted as the tornado moved through, and branches
of numerous small trees in the area were snapped. Several metal
light posts were also bent at the base in and around these
parking lots as a result of the wind and/or flying debris, and the
poles supporting two stop signs were bent and dislodged as well.
A supporting pole to the entranceway of the Staybridge hotel was
also damaged as the storm���s circulation moved by. As the tornado
continued to travel in a northeasterly direction, the circulation
slowly weakened, with some minor roof damage to the Costco
building. Some minor tree damage was reported on Cathedral Drive
just northeast of the shopping center, and it is estimated that
the tornado lifted in this area after only about a minute on the
ground.

Thunderstorm Wind in DELAWARE, PENNSYLVANIA
From 30-NOV-20 15:49:00 to 30-NOV-20 15:49:00 (EST-5)
Location: SPRINGFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree and wires were downed near Overhill Rd in Springfield Twp. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 30-NOV-20 15:49:00 to 30-NOV-20 15:49:00 (EST-5)
Location: EASTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

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

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:19:00 to 30-NOV-20 15:19:00 (EST-5)
Location: HARMONY HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near North Creek Rd and near East Bradford Twp. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:19:00 to 30-NOV-20 15:19:00 (EST-5)
Location: DOWNINGTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Lincoln Ave in Downingtown. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 30-NOV-20 15:53:00 to 30-NOV-20 15:53:00 (EST-5)
Location: APPLEBACHSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree was downed in wires near Roudenbush Rd. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 30-NOV-20 15:55:00 to 30-NOV-20 15:55:00 (EST-5)
Location: CHALFONT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Blackburn Dr in Chalfont. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:20:00 to 30-NOV-20 15:20:00 (EST-5)
Location: LENAPE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree and wires were downed near Williamsburg Dr in Pocopson Twp. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:20:00 to 30-NOV-20 15:20:00 (EST-5)
Location: GLENLOCH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed near Frame Ave and Mulberry Dr. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 30-NOV-20 15:59:00 to 30-NOV-20 15:59:00 (EST-5)
Location: PROSPECTVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A utility was downed on Limekiln Pike near Fairway Rd. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 30-NOV-20 16:06:00 to 30-NOV-20 16:06:00 (EST-5)
Location: NESHAMINY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree and wires were downed near Sinkler Rd in Neshaminy. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:21:00 to 30-NOV-20 15:21:00 (EST-5)
Location: FAIRVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed near the intersection of Fairville Rd and Cossart Dr. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:21:00 to 30-NOV-20 15:21:00 (EST-5)
Location: WEST CHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

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

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 30-NOV-20 16:10:00 to 30-NOV-20 16:10:00 (EST-5)
Location: DOYLESTOWN ARPT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Trees and wires were downed near Church School Rd and Fell Rd in Doylestown. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 30-NOV-20 16:12:00 to 30-NOV-20 16:12:00 (EST-5)
Location: CHALFONT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree and fence were knocked down on a property in Chalfont. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:22:00 to 30-NOV-20 15:22:00 (EST-5)
Location: LENAPE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wires were downed near the intersection of Pocopson Rd and Chandler Rd. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:23:00 to 30-NOV-20 15:23:00 (EST-5)
Location: OAKBOURNE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A tree was downed near the intersection of Wilmington Pike and West Pleasant Grove Rd. Time estimated from radar.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 30-NOV-20 16:15:00 to 30-NOV-20 16:15:00 (EST-5)
Location: MECHANICSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

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

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:23:00 to 30-NOV-20 15:23:00 (EST-5)
Location: GREEN HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Wires were downed near Ship Rd in Exton. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:23:00 to 30-NOV-20 15:23:00 (EST-5)
Location: EXTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on Shetland Dr. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:25:00 to 30-NOV-20 15:25:00 (EST-5)
Location: EXTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Wires were downed near Exton Square Parkway. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 30-NOV-20 15:26:00 to 30-NOV-20 15:26:00 (EST-5)
Location: MALVERN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A tree and wires were downed near Pickwick Ln in Malvern. Time estimated from radar.