The remnants of Tropical Storm Fred affected the mid-Atlantic region on the night of August 18 into the predawn hours of August 19. In addition to heavy rain and areas of flooding, Fred's remnants brought a threat for severe weather. As the center of the system moved from central Pennsylvania into the Finger Lakes region of New York, it became increasingly frontal in nature. A warm sector air mass overspread the eastern mid-Atlantic. Instability was limited due to the overnight timing. However, strong shear and forcing combined with tropical moisture allowed for widespread convection to occur as Fred's remnants moved through. Several instances of damaging wind and a couple of tornadoes occurred in the region during the overnight hours, before the system departed on the morning of the 19th.

Tornado in BERKS, PENNSYLVANIA
From 18-AUG-21 20:15:00 to 18-AUG-21 20:18:00 (EST-5)
Location: BERNE
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado touched down along Fisher Dam Road about 800 feet north
of the intersection with Berne Road. Numerous hardwood tree trunks
were snapped on the western side of the road with a convergent debris
pattern. A corn field on the east side of the road in the same
location was damaged with stalks of corn felled in a convergent
pattern. Further north on Fisher Dam Road, hardwood tree damage was
noted, but it was more sporadic.
Additional damage was noted about a half-mile north of the
intersection of Berne Road and Hill Drive, including numerous trees
snapped on the east side of Berne Road. A little farther north, about
450 feet south of the intersection with Ash Road, a utility pole was
snapped, and hardwood trees were snapped both on the western side
and the eastern side of the road with convergent debris patterns
noted.
There was damage on Ash Road, including a roof that was removed from
a porch and the roof damage extended into the main roof of the
house. The roof was deposited to the east, while at the same time, a
flagpole from the roof supports was tossed to the north. There was
also numerous snapped hardwood trees in this area. Further east on
Ash Road, another house had a large, healthy tree snapped. Tree
damage was also noted on properties on the north side of Ash Road.
Further north of Ash Road, some damage occurred at the Village of
Pleasant Hills Mobile Home community, including hardwood trees
snapped and some cars were damaged by the fallen trees. Some skirting
along the base of a mobile home was mostly torn off. The damage
appeared to become more sporadic and then ended.

Tornado in BUCKS, PENNSYLVANIA
From 18-AUG-21 23:29:00 to 18-AUG-21 23:40:00 (EST-5)
Location: TELFORD
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

After crossing into Bucks County, the tornado then
brought down several trees and branches in the Hidden Springs
mobile home community. Here, several trees were brought down on
homes and across roadways while also leading to minor damage to
the roofs and siding of several residences in the community. The
tornado then proceeded northeastward into Hilltown Township in
Bucks County as it brought down numerous trees in a trajectory
towards Silverdale. Several trees along this line were also
brought down. A metal roof was even torn off of a garage along
Green Street in Silverdale. Several large branches were then
brought down, damaging a roof to a farmhouse along Souderton Road.
The tornado continued its path northeast, bringing down small
trees and snapping the tops of several pine trees at residences
along Woodlawn Drive and Blue School Road. Lastly, the tornado
began to lift as it neared the opposite end of Hilltown Township,
but not before it ripped a section of roofing off an auto repair
shop along North Dublin Pike at the intersection of Blue School
Road.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 19-AUG-21 00:19:00 to 19-AUG-21 00:19:00 (EST-5)
Location: FT WASHINGTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A downed tree closed Route 309 near Highland Ave. Time estimated from radar.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 18-AUG-21 22:25:00 to 18-AUG-21 22:25:00 (EST-5)
Location: ZUCKSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A few trees were downed between Nazareth and Bangor. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 18-AUG-21 23:40:00 to 18-AUG-21 23:40:00 (EST-5)
Location: WEST PT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A large tree was downed near the intersection of 2nd St and Oak St. Time based on dispatch report.

Tornado in MONTGOMERY, PENNSYLVANIA
From 18-AUG-21 23:25:00 to 18-AUG-21 23:29:00 (EST-5)
Location: ELROY
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

A line of thunderstorms moved across Montgomery and Bucks Counties
early on the morning of August 19th as the remnants of Tropical Storm
Fred moved across central Pennsylvania. As a velocity couplet formed across Montgomery County, a tornado
formed roughly a mile and a half south of Souderton, PA around
12:25 AM EDT, where it brought down a tree branch and tore siding
off of a residence on Garrison Lane. From there, the tornado
appears to have lifted briefly before bringing down a few small
trees and branches along Township Line Road, near County Line Rd at Bethlehem Pike. The tornado then moved into Bucks County, where its path continued.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 18-AUG-21 20:33:00 to 18-AUG-21 20:33:00 (EST-5)
Location: GOUGLERSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees and power lines were downed near Vermont Rd. Time estimated from radar.

Thunderstorm Wind in BERKS, PENNSYLVANIA
From 18-AUG-21 19:32:00 to 18-AUG-21 19:32:00 (EST-5)
Location: WOMELSDORF STATION
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

There were several downed trees and wires in Heidelberg and South Heidelberg Twps. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 18-AUG-21 23:25:00 to 18-AUG-21 23:25:00 (EST-5)
Location: DEVAULT
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

There were several reports of trees down between Malvern and Phoenixville. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 18-AUG-21 23:01:00 to 18-AUG-21 23:01:00 (EST-5)
Location: WEST CHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees were downed in East Bradford Twp near Downingtown Pike. Time estimated from radar.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 19-AUG-21 00:43:00 to 19-AUG-21 00:43:00 (EST-5)
Location: JENKINTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A large tree was downed near the intersection of Newbold Rd and Clement Rd. Time estimated from radar.

Hail in MONTGOMERY, PENNSYLVANIA
From 18-AUG-21 22:03:00 to 18-AUG-21 22:03:00 (EST-5)
Location: LIMERICK CENTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were multiple reports of hail up to penny size in the area. While unremarkable on its own, this was considered highly unusual and surprising, as hail is rarely observed with tropical cyclone remnants.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 18-AUG-21 17:32:00 to 18-AUG-21 17:32:00 (EST-5)
Location: HOMEVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Two utility poles were snapped along Route 986. It is possible, but unable to be confirmed, that this could have been a very brief, weak tornado. Time estimated from radar.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 18-AUG-21 23:15:00 to 18-AUG-21 23:15:00 (EST-5)
Location: GUTHRIESVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

There were several reports of tree and power line damage in the Downingtown, West Chester, and Exton areas, with several roads closed. Time estimated from radar.