Thunderstorms formed during the afternoon and evening of the 12th in an environment of moderate CAPE and moderate shear southeast of a stationary front. Thunderstorms initially formed as single cells, then formed into multicell clusters later in the event over the Lower Susquehanna Valley.    Further north slower moving storms brought flooding around Mansfield in Tioga County.

Thunderstorm Wind in PERRY, PENNSYLVANIA
From 12-JUL-21 14:20:00 to 12-JUL-21 14:20:00 (EST-5)
Location: LOYSVILLE
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm with winds estimated near 60 mph brought down multiple trees and wires.

Thunderstorm Wind in PERRY, PENNSYLVANIA
From 12-JUL-21 14:25:00 to 12-JUL-21 14:25:00 (EST-5)
Location: ELLIOTSBURG
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm with winds estimated near 60 mph brought down a tree on wires.

Thunderstorm Wind in DAUPHIN, PENNSYLVANIA
From 12-JUL-21 15:18:00 to 12-JUL-21 15:18:00 (EST-5)
Location: INGLENOOK
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm with winds estimated near 60 mph brought down a large tree on wires across Clarks Valley Rd.

Thunderstorm Wind in DAUPHIN, PENNSYLVANIA
From 12-JUL-21 15:17:00 to 12-JUL-21 15:17:00 (EST-5)
Location: INGLENOOK
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm with winds estimated near 60 mph brought down trees on wires.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 12-JUL-21 15:12:00 to 12-JUL-21 15:12:00 (EST-5)
Location: FLORIN
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm with winds estimated near 60 mph brought down trees on wires on Bruce Ave.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 12-JUL-21 16:25:00 to 12-JUL-21 16:25:00 (EST-5)
Location: GORDONVILLE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm with winds estimated near 60 mph brought down trees on wires on Pequea Manor Rd.

Flash Flood in TIOGA, PENNSYLVANIA
From 12-JUL-21 16:35:00 to 13-JUL-21 01:15:00 (EST-5)
Location: ROSEVILLE
Flood cause: Heavy Rain
Property damage: 300.00K
Crop damage: 0.00K
Reported by: State Official

At 1935 EDT Tioga County is activating their EOC to an enhanced level due to flooding conditions throughout the county. Trailer park on Benedict Lane in Roseville is being evacuated, one foot of water and rising. Rt 660 in Delmar Township is flooded. Route 6 in Mansfield is flooding. Numerous roadways washed out and flooded.
At 2020 EDT Roseville area at 73 Benedict Road (in Mansfield) a Mobile Home Park is flooding, 10 residents are being evacuated to the Mansfield Fire Department. Route 549 and Route 6 in Roseville are underwater in multiple locations. Route 549 is passable, but has substantial debris on the roadway from the flooding. At 2246 EDT a total of 38 persons were evacuated from the Roseville area this evening. Route 549 remains closed. Route 6 has reopened. Route 287 has reopened.