Severe thunderstorm clusters across western Pennsylvania organized into bowing line segments as they moved east-southeast across the southern Alleghenies and Laurel Highlands during the late afternoon and early evening. The line of storms produced isolated wind damage and sub-severe hail. A more discrete thunderstorm cell just ahead of the main line of storms produced a brief, weak EF0 tornado in Somerset County. An area of locally heavy rain produced flash flooding in York County during the late evening, with areal flooding persisting into the early morning on 8/8.

Thunderstorm Wind in SOMERSET, PENNSYLVANIA
From 07-AUG-13 17:55:00 to 07-AUG-13 17:55:00 (EST-5)
Location: JENNERSTOWN
Magnitude: 50.00 EG
Property damage: 0.50K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down a few large trees and blew a dilapidated roof off of a barn near Jennerstown along Route 30.

Thunderstorm Wind in JUNIATA, PENNSYLVANIA
From 07-AUG-13 19:30:00 to 07-AUG-13 19:30:00 (EST-5)
Location: PORT ROYAL
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down several trees near Port Royal.

Thunderstorm Wind in SOMERSET, PENNSYLVANIA
From 07-AUG-13 18:20:00 to 07-AUG-13 18:20:00 (EST-5)
Location: WINDBER
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

Thunderstorm winds estimated near 60 mph knocked down a large tree in Windber.

Thunderstorm Wind in BEDFORD, PENNSYLVANIA
From 07-AUG-13 19:00:00 to 07-AUG-13 19:00:00 (EST-5)
Location: MARIA
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees along North Road.

Thunderstorm Wind in SOMERSET, PENNSYLVANIA
From 07-AUG-13 17:55:00 to 07-AUG-13 17:55:00 (EST-5)
Location: EDIE
Magnitude: 70.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Thunderstorm straight-line winds estimated near 80 mph knocked down the front and back walls and took the roof of a metal barn (the side walls remained standing). A steel wagon in the barn was turned on its side. Pieces of the roof were located several hundred yards to the east in a field along with several downed trees. The damage occurred in Lincoln Township along Keysertown and Bell Lane Road.

Funnel Cloud in CAMBRIA, PENNSYLVANIA
From 07-AUG-13 17:40:00 to 07-AUG-13 17:40:00 (EST-5)
Location: MUNDAYS CORNER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A funnel cloud was sighted looking south from Mile Hill Road.

Funnel Cloud in SOMERSET, PENNSYLVANIA
From 07-AUG-13 18:15:00 to 07-AUG-13 18:15:00 (EST-5)
Location: WINDBER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A funnel cloud was sighted a few miles southeast of Windber.

Hail in FULTON, PENNSYLVANIA
From 07-AUG-13 17:40:00 to 07-AUG-13 17:40:00 (EST-5)
Location: BURNT CABINS STRIP
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter inch hail (1 inch diameter) was reported near Amberson Valley.

Thunderstorm Wind in CLEARFIELD, PENNSYLVANIA
From 07-AUG-13 16:10:00 to 07-AUG-13 16:10:00 (EST-5)
Location: SABULA
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees along Route 255 southwest of Penfield.

Thunderstorm Wind in CLEARFIELD, PENNSYLVANIA
From 07-AUG-13 16:05:00 to 07-AUG-13 16:05:00 (EST-5)
Location: OKLAHOMA
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near DuBois.

Thunderstorm Wind in ELK, PENNSYLVANIA
From 07-AUG-13 16:30:00 to 07-AUG-13 16:30:00 (EST-5)
Location: WEEDVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down a large tree along Bennetts Valley Highway (Route 255) near Weedville.

Thunderstorm Wind in CAMBRIA, PENNSYLVANIA
From 07-AUG-13 17:30:00 to 07-AUG-13 17:30:00 (EST-5)
Location: MUNDAYS CORNER
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in Jackson Township.

Tornado in SOMERSET, PENNSYLVANIA
From 07-AUG-13 18:20:00 to 07-AUG-13 18:21:00 (EST-5)
Location: RALPHTON
Tornado F-scale: EF0
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm survey conducted in Quemahoning Township in Somerset County confirmed a brief, weak EF0 tornado occurred a few miles east of Ralphton near Horner Church Road. One home sustained minor damage and one barn roof was partially torn off. Over 2 dozen trees were knocked down or damaged. The estimated maximum wind speed was between 70-80 mph. The maximum path width was 75 yards with a path length of about 0.25 mile. There were no injuries or fatalities.

Thunderstorm Wind in CLEARFIELD, PENNSYLVANIA
From 07-AUG-13 16:10:00 to 07-AUG-13 16:10:00 (EST-5)
Location: SABULA
Magnitude: 50.00 EG
Property damage: 2.50K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down several large trees in Treasure Lake.

Hail in FRANKLIN, PENNSYLVANIA
From 07-AUG-13 18:15:00 to 07-AUG-13 18:15:00 (EST-5)
Location: METAL
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail (1 inch diameter) was reported near Amberson Valley.

Hail in SOMERSET, PENNSYLVANIA
From 07-AUG-13 18:10:00 to 07-AUG-13 18:10:00 (EST-5)
Location: WINDBER
Magnitude: 0.88 
Reported by: Trained Spotter

Nickel size hail (0.88 inch diameter) was reported in Windber.

Flash Flood in YORK, PENNSYLVANIA
From 07-AUG-13 22:30:00 to 08-AUG-13 00:30:00 (EST-5)
Location: PENNVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Heavy thunderstorm rains produced flash flooding across portions of southern York County during the late evening and early overnight hours. Spotter reports indicated  two inches of rain fell in about 1 hour. Street flooding was reported in Hanover. A water rescue was conducted at the intersection of Seven Valleys Road (State Route 616) and Maple Street in North Codorus Township. A motorist drove her car into Codorus Creek which has flooded over the road. Emergency responders were able to rescue both occupants of the stranded vehicle. This section of the road along Codorus Creek was closed for much of the night.