Scattered thunderstorms developed over central Pennsylvania, ahead of a weak mid-level shortwave, during the afternoon of August 7, 2020. A few of these storms produced wind damage, as well as flash flooding across Lancaster and York Counties.

Thunderstorm Wind in UNION, PENNSYLVANIA
From 07-AUG-20 07:20:00 to 07-AUG-20 07:20:00 (EST-5)
Location: FORESTHILL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees along Interstate 80 near mile-marker 197.

Thunderstorm Wind in NORTHUMBERLAND, PENNSYLVANIA
From 07-AUG-20 08:30:00 to 07-AUG-20 08:30:00 (EST-5)
Location: SOUTH DANVILLE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm producing winds estimated near 60 mph knocked down multiple large trees onto Avenue F in Riverside.

Thunderstorm Wind in COLUMBIA, PENNSYLVANIA
From 07-AUG-20 08:42:00 to 07-AUG-20 08:42:00 (EST-5)
Location: GROVANIA
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down trees onto the 300 block of Legion Road to the southwest of Bloomsburg.

Thunderstorm Wind in MONTOUR, PENNSYLVANIA
From 07-AUG-20 08:35:00 to 07-AUG-20 08:35:00 (EST-5)
Location: OTTAWA
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires in Montour County.

Thunderstorm Wind in COLUMBIA, PENNSYLVANIA
From 07-AUG-20 09:14:00 to 07-AUG-20 09:14:00 (EST-5)
Location: SLABTOWN
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Utility Company

A severe thunderstorm producing winds estimated near 60 mph knocked down trees onto wires at Old Reading Road and Creek Road to the east of Slabtown.

Thunderstorm Wind in COLUMBIA, PENNSYLVANIA
From 07-AUG-20 09:18:00 to 07-AUG-20 09:18:00 (EST-5)
Location: MILL GROVE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Utility Company

A severe thunderstorm producing winds estimated near 60 mph knocked down trees onto wires to the east of Mill Grove.

Thunderstorm Wind in MIFFLIN, PENNSYLVANIA
From 07-AUG-20 10:50:00 to 07-AUG-20 10:50:00 (EST-5)
Location: BURNHAM ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A severe thunderstorm producing winds estimated near 60 mph knocked down trees along a recreational trail just south of Reeds Gap State Park.

Flash Flood in LANCASTER, PENNSYLVANIA
From 07-AUG-20 15:00:00 to 07-AUG-20 17:30:00 (EST-5)
Location: OLD LINE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Widespread flash flooding was reported across Lancaster and a small portion of York County.
A dozen water rescue calls were reported for areas including East Hempfield, East Lampeter, Manheim, Providence, Salisbury, Strasburg, Upper Leacock, West Earl and West Hempfield townships.
In addition to the water rescue calls, there were many reports of high water on roads across the Lancaster county, and some residential flooding.
Two rescue calls were  for vehicles in water, according to initial dispatch reports, one on Meadow View Drive in West Earl Township just before 4 p.m., and one in the area of East Main Street in Upper Leacock Township just after 4 p.m.
A third water rescue call was reported in the 300 block of West Main Street in Upper Leacock Township just before 4:30 p.m.
Just before 5 p.m., more water rescue calls were reported: in the 1300 block of Marshall Avenue in Manheim Township; in the 500 block of Weaver Road in Strasburg Township; and at Independence Court and Greenfield Road in East Lampeter Township.
Others followed shortly, at Pennsy Road and Main Street in Providence Township; at Greenfield Road and railroad tracks in East Lampeter Township; at Strasburg Road and Old Strasburg Road in Salisbury Township; and at Lincoln Highway East and North Kinzer Road in Paradise Township.  High water was also reported at Old Harrisburg Pike and Spooky Nook Road in West Hempfield Township, and at Snapper Dam Road and Northside Drive in East Hempfield Township.
Calls for high water on roadway later came from Bowman Road and Parker Drive in East Hempfield Township; Cardinal Road and North Elm Street in Lititz Borough; South 14th Street and Central Avenue in Columbia Borough; and Ruby Street and Froelich Avenue in Mountville Borough.
By 4:40 p.m. the list of calls for high water on roadway included Peace Road in West Earl Township; Church Street and Daryl Drive in East Hempfield Township; West Penn Grant Road and Marticville Road in Pequea Township; and Peach Bottom Road and Beaver Valley Pike in West Lampeter Township.
At 5pm a water rescue was reported at Arsenal Road and North George Stree 1 mile north of York in York County.

Later reports came from Marticville Road and Goods Run in Pequea Township; Hollinger Road and Millwood Road in West Lampeter Township; Bachmantown Road and South Ronks Road in East Lampeter Township; Snakehill Road and Route 23 in Upper Leacock Township; and Running Pump Road in East Hempfield Township.
Starting at about 5:30 p.m., high water on roadway reports came for Embassy Drive and Rohrerstown Road in East Hempfield Township; New Holland Avenue and East Ross Street in Lancaster City; and Pleasure Road and Deer Ford Drive in Manheim Township.
Just before 5:30 p.m., PPL's outage center showed 805 customers without power in Lancaster County.