An upper level disturbance moved out of the Ohio Valley and triggered severe thunderstorms and tornadoes across portions of central and eastern Pennsylvania. A total of 3 tornadoes were confirmed ranging in magnitude from EF1-EF2.

Thunderstorm Wind in SCHUYLKILL, PENNSYLVANIA
From 23-MAY-11 17:45:00 to 23-MAY-11 17:45:00 (EST-5)
Location: TAMAQUA
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

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

Thunderstorm Wind in JUNIATA, PENNSYLVANIA
From 23-MAY-11 16:25:00 to 23-MAY-11 16:25:00 (EST-5)
Location: RICHFIELD
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds estimated near 60 mph knocked down trees and wires in Richfield. This storm produced an EF2 tornado with a damage path just south of Richfield.

Thunderstorm Wind in SCHUYLKILL, PENNSYLVANIA
From 23-MAY-11 17:38:00 to 23-MAY-11 17:41:00 (EST-5)
Location: LEWISTOWN
Magnitude: 83.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A NWS survey team found evidence of strong downburst winds extending along a nearly two mile path in Walker Township. This area of downburst winds also included a small EF1 tornado which is separately documented.
The downburst winds partially removed the roof of one home on Kettle Road, and portions of three barn roofs along Catawissa Road. A cement wall of a barn was also toppled from the winds along Catawissa Road. Top wind speeds were estimated at around 95 mph with this downburst wind damage. There were no injuries or fatalities associated with the damage swath.

Hail in MCKEAN, PENNSYLVANIA
From 23-MAY-11 22:50:00 to 23-MAY-11 22:50:00 (EST-5)
Location: BRADFORD
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm Wind in CLINTON, PENNSYLVANIA
From 23-MAY-11 15:45:00 to 23-MAY-11 15:45:00 (EST-5)
Location: CASTANEA
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in Castanea near Lock Haven.

Tornado in JUNIATA, PENNSYLVANIA
From 23-MAY-11 16:23:00 to 23-MAY-11 16:31:00 (EST-5)
Location: COCOLAMUS
Tornado F-scale: EF2
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The NWS State College confirmed a EF2 tornado near Kellerville in Juniata County.  The tornado touched down around 1723 EDT about 1/4 mile west of 1332 Kellerville Road and traveled east approximately 5 miles before lifting just east of 7 Stars Road around 1731 EDT.
The tornado laid a pattern in a hay field before crossing Kellerville Road where it toppling a concrete silo which fell on and obliterated a cow barn, killing 7 dairy cows. The house south of the barn at 1332 Kellerville Road had the entire roof and attic portion blown off and was shifted on its foundation. Several outbuildings and sheds on the property were also obliterated. The debris and tornado moved southeastward with visible tree damage on the hill.
The tornado did considerable damage to a hamlet along Evendale Hill Road. A house at 3009 Evendale Hill Road lost its entire roof and attic and was shifted about 6 inches to north causing the north facing basement wall to bulge out. Roof materials and personal items from the attic were blown into trees and up the road to the north. The tornado ripped up and snapped virtually all trees along the hill behind the house and farm. Several outbuildings were damaged and a neighboring house was damaged.
The tornado continued to the east, snapping trees and causing minor to moderate damage to other houses and outbuildings along the path. Older sheds and farm outbuildings along this track sustained major damage or were destroyed. Near the end of its track, the tornado tore apart a garage attached to a recently built house at 2787 Seven Stars Road. The house itself was also shifted on its foundation. The resident of this home heard a loud noise and witnessed the tornado in the valley heading towards him and took cover. The tornado dissipated to the east of this home, in a wooded area to the west of Peanut Road.
Overall, this tornado produced an approximate 4.7-mile-long swath of nearly continuous damage. The damage indicators were consistent with peak winds between 115 and 130 mph. Overall, a total of 7 homes sustained damage ranging from minor to major, and 15 barns and outbuildings either severely damaged or completely destroyed. There were no injuries or fatalities.

Tornado in SCHUYLKILL, PENNSYLVANIA
From 23-MAY-11 17:37:00 to 23-MAY-11 17:38:00 (EST-5)
Location: LEWISTOWN
Tornado F-scale: EF1
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A NWS storm survey team found evidence that a small EF1 tornado touched down just south of Brockton in Walker Township at 1837 EDT. The tornado traveled only about a quarter of a mile to the east-northeast, before dissipating near Kettle Road around 1838 EDT. The tornado was embedded in a larger area of downburst winds, which extended approximately two miles farther to the east, crossing Catawissa Road.
Damage caused by the tornado was mainly confined to a wooded area, snapping or toppling about 25 trees. The tornado appeared to dissipate on the property along Kettle Road. Here, a large awning/roof was removed from a home. A barn was completely leveled. Across Kettle Road, another home lost portions of it's roof from the wind. Moderate damage to the house was also sustained from flying debris from the collapsed barn across the road. The downburst winds next encountered a home and several barns along Catawissa Road over a mile to the east. Significant roofing loss was noted at two barns on the west side of Catawissa Road, and one on the east side of Catawissa Road. This marked the end of the concentrated downburst damage path.
The tornado and downburst winds both had damage indicators implying peak winds around 95 mph. The tornado was rated an EF1. There were no injuries or fatalities.

Tornado in NORTHUMBERLAND, PENNSYLVANIA
From 23-MAY-11 16:40:00 to 23-MAY-11 16:42:00 (EST-5)
Location: CHILLISQUAQUE
Tornado F-scale: EF1
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The NWS State College confirmed a EF1 tornado in Northumberland County. The tornado touched down around 1739 EDT near Winfield in Union County and traveled east across the Susquehanna River approximately 1 1/4 miles between 1740-1741 EDT before lifting near PA 147 around 1742 EDT. The tornado first touched down west of 165 Grover Road in Union County. Damage was primarily snapped and uprooted trees. The tornado moved down the hill crossing US-15 and River Breeze Avenue before moving over the Susquehanna River into Northumberland County. Tree damage along River Breeze road caused damage to two homes, and trees were snapped on the south end of an island near the east shore of the river. The tornado moved through a campground north of Ferry Road, downing and uprooting trees in the camp ground. The trees damaged several camper vans and a pavilion before crossing a field and moving up the hill. Strong southerly inflow ahead of the tornado damaged five homes along Route 147. Leaves plastered to these houses implied strong southerly and easterly winds. Aluminum siding on the southern side of the several houses was dented and the winds blew out the west wall of garage of another house, which had its south facing garage doors left open during the storm. Another home closer to the river also sustained damage to the roof, chimney, and exterior walls. In this same area, utility poles were downed and snapped. Tree damage and minor damage was sustained by sustained at two homes to the north of the more heavily damaged homes. Throughout the damage swath, most trees fell from southwest to northeast, and fewer fell from the south. Several outbuildings west of Route 147, including one two-story cinder block shed, were destroyed by the tornado. Roofing debris from these outbuildings was found in adjacent properties and in an open field across Route 147. Some of this debris was also found embedded several inches into nearby trees. The tornado dissipated up the hill, perhaps 200 yards east of a power line easement. There were several eyewitnesses, and most had taken shelter. One eyewitness living near the corner of Route 147 and Ferry Road watched the wind move northward, heard the roar of the storm and watched a white cloud pass to his north over the homes. The damage indicators were consistent with peak winds around 110 mph. There were no injuries or fatalities.

Tornado in UNION, PENNSYLVANIA
From 23-MAY-11 16:39:00 to 23-MAY-11 16:40:00 (EST-5)
Location: WINFIELD
Tornado F-scale: EF1
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The NWS State College confirmed a EF1 tornado in Union County.  The tornado touched down around 1739 EDT near Winfield and traveled east across the Susquehanna River approximately 1 1/4 miles before lifting near PA 147 around 1742 EDT in Northumberland County.
The tornado touched down west of 165 Grover Road in Union County. Damage was primarily snapped and uprooted trees. The tornado moved down the hill crossing US-15 and River Breeze Avenue before moving over the Susquehanna River into Northumberland County.
Tree damage along River Breeze road caused damage to two homes, and trees were snapped on the south end of an island near the east shore of the river. The tornado moved through a campground north of Ferry Road, downing and uprooting trees in the camp ground. The trees damaged several camper vans and a pavilion before crossing a field and moving up the hill. Strong southerly inflow ahead of the tornado damaged five homes along Route 147.  Leaves plastered to these houses implied strong southerly and easterly winds. Aluminum siding on the southern side of the several houses was dented and the winds blew out the west wall of garage of another house, which had its south facing garage doors left open during the storm. Another home closer to the river also sustained damage to the roof, chimney, and exterior walls. In this same area, utility poles were downed and snapped.
Tree damage and minor damage was sustained by sustained at two homes to the north of the more heavily damaged homes. Throughout the damage swath, most trees fell from southwest to northeast, and fewer fell from the south. Several outbuildings west of Route 147, including one two-story cinder block shed, were destroyed by the tornado. Roofing debris from these outbuildings was found in adjacent properties and in an open field across Route 147. Some of this debris was also found embedded several inches into nearby trees. The tornado dissipated up the hill, perhaps 200 yards east of a power line easement.
There were several eyewitnesses, and most had taken shelter. One eyewitness living near the corner of Route 147 and Ferry Road watched the wind move northward, heard the roar of the storm and watched a white cloud pass to his north over the homes.
The damage indicators were consistent with peak winds around 110 mph.  There were no injuries or fatalities.