Hurricane Sandy began as a tropical wave over the Caribbean Sea around 19 October 2012 and became a powerful storm by 23 October 2012 before making its long track over the western Atlantic, just off the East Coast of the United States and then into New Jersey and Pennsylvania. High latitude blocking over the North Atlantic and the interaction with a strong upper-air disturbance over the central Appalachians allowed Sandy to take a sharp left turn and accelerate northwest from the western Atlantic into southern New Jersey and across southern Pennsylvania. The center of post-tropical Sandy moved westward across the state beginning late in the evening on the 29th. The remnants of Sandy, a weakening low pressure system, exited northwestern Pennsylvania into Canada on October 31, 2012.
The highest recorded storm-total rainfall amount obtained in PA for the Oct 28-31, 2012 period was 7.94 inches at Schellsburg 2.6 WNW in Bedford County.  There was an unconfirmed report of 8.15 inches at Hanover 5.4 S in York County which has not been verified. There was widespread storm-total rainfall amounts of 3 to 5 inches over the central and south portions of the Commonwealth with locally up to near 8 inches along the MD border region. However despite the heavy rainfall, hydrologic impacts were rather limited.  Most of the significant flooding occurred in the southern most counties bordering Maryland, where the heaviest rainfall totals occurred.  Areal Flood Warnings and Advisories were issued for the region. Six river forecast points rose above flood stage, with all but the Conestoga River at Lancaster (with moderate flooding) experiencing minor flood crests.
The impacts from the strong winds were widespread, with peak wind gusts were measured in the 50 to 60 mph range. High wind watches and warnings were issued well in advance of the storm. There were several reports of roof and other minor structural damage to homes and businesses. Widespread reports of trees down and power lines down were received. Wind damage caused significant power outages at the height of the storm.
Cold air was drawn into the southwest-side of the storm and produced heavy snows from October 29-31 across the southern Laurel Mountains.  Amounts in excess of a foot were reported at several locations over the highest elevations including 14 inches at Laurel Summit in Somerset County. The ridges in Cambria County received between 2 and 4 inches.
There was one indirect storm-related fatality that occurred on the evening of the 29th. A person was killed in a Somerset County traffic accident, when their car slid off snow and slush covered road into a farm pond.
A disaster emergency was issued by the Governor on October 26, 2012. This was followed by a Presidential Emergency Declaration on October 29, 2012.
In summary, Superstorm Sandy was an enduring late season tropical cyclone which developed during a period of high-latitude blocking over the Atlantic Basin. The storm came ashore in New Jersey with significant impact to the coastal regions of the Mid-Atlantic states. The interaction of hurricane Sandy with a strong upper-air disturbance produced one of the more memorable and destructive storms in the Mid-Atlantic region in over 100 years.

Flood in BEDFORD, PENNSYLVANIA
From 29-OCT-12 17:00:00 to 30-OCT-12 03:15:00 (EST-5)
Location: LOVELY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was most widespread in West St. Clair Township.  Eight to ten roads were closed and one home was flooded near Camp Pleasant.

Flood in CUMBERLAND, PENNSYLVANIA
From 29-OCT-12 17:00:00 to 30-OCT-12 03:15:00 (EST-5)
Location: NEWBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Generally minor flooding, with 1 flooded road and several flooded basements reported.

Flood in FRANKLIN, PENNSYLVANIA
From 29-OCT-12 17:00:00 to 30-OCT-12 03:00:00 (EST-5)
Location: YEAKLE MILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was noted in Montgomery, St. Thomas, Hamilton, Letterkenny, and Lurgan Townships.  Widespread basement flooding and some road damage occurred where streams were out of their banks.

Flood in LANCASTER, PENNSYLVANIA
From 29-OCT-12 11:15:00 to 30-OCT-12 09:15:00 (EST-5)
Location: CHURCHTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Conestoga River at Lancaster crested at 14.27 feet, in moderate flood stage.  Several homes were affected by high water.
There was a precautionary evacuation of apporoximately 150 persons downstream of Speedwell Forge Dam in Elizabeth Township at approximately 4pm EDT on the 29th.

Flood in MIFFLIN, PENNSYLVANIA
From 29-OCT-12 17:00:00 to 30-OCT-12 03:15:00 (EST-5)
Location: NEWTON HAMILTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Many local roads were closed due to storm water runoff and small stream flooding.

Flood in SCHUYLKILL, PENNSYLVANIA
From 29-OCT-12 17:00:00 to 30-OCT-12 03:15:00 (EST-5)
Location: KLINGERSTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rainfall resulted in minor flooding, mainly of basements.  State Road 202 at Mill Street in Reilly Township was closed due to flooding.

Flood in YORK, PENNSYLVANIA
From 29-OCT-12 11:15:00 to 30-OCT-12 08:15:00 (EST-5)
Location: CLEAR SPG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

York County reported approximately 40 bridges were closed due to high water and debris.  Five water rescues were performed and five mobile home parks were evacuated as a precaution.  Glen Rock Borough evacuated 50 homes as a flooding precaution.  Route 616 and Indian Rock Dam Road was flooded.   The Seven Valleys Fire Department suffered temporary flooding.
During Monday, October 29, rising waters in streams led to precautionary evacuations of many persons at the following locations; Meadow Creek Mobile Home Park;  Prince Mobile Home Park;  Sharps Mobile Home Park; and Pine Road and Zimmys Road in Conewago Township.

High Wind in LANCASTER, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds produced widespread damage, including numerous trees and wires being knocked down. At the height of the storm, these 13,000 customers were without power.

High Wind in SOMERSET, PENNSYLVANIA
From 29-OCT-12 17:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down numerous trees and utility wires, causing widespread power outages county-wide.

High Wind in UNION, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees and utility wires, causing sporadic power outages. Most significant impacts were felt in Hartley, West Buffalo and White Deer Townships. At the height of the storm there were over 4,00 customers without power. Some roadways were closed due to falling trees.

High Wind in DAUPHIN, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees and utility wires, resulting in approximately 10,000 power outages. Several roads were also closed. Multiple homes sustained significant structural damage due to the high winds and falling trees.

High Wind in FRANKLIN, PENNSYLVANIA
From 29-OCT-12 16:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees with scattered power outages reported county-wide. A few structures sustained minor damage. The high wind damage was concentrated in Montgomery, Peters, and St. Thomas Townships.

High Wind in FULTON, PENNSYLVANIA
From 29-OCT-12 16:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees with widespread power outages reported county-wide.

High Wind in HUNTINGDON, PENNSYLVANIA
From 29-OCT-12 16:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees with widespread power outages reported county-wide. Several homes sustained minor to moderate damage.

High Wind in JUNIATA, PENNSYLVANIA
From 29-OCT-12 16:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees with widespread power outages reported county-wide.

High Wind in ADAMS, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Significant high wind damage was reported with peak gusts measured between 60-65 mph. Downed trees and utility wires closed dozens of roads. More than 7,000 homes and businesses were without power at the height of the storm.

High Wind in BEDFORD, PENNSYLVANIA
From 29-OCT-12 16:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees with scattered power outages reported county-wide.

High Wind in LEBANON, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds produced widespread damage. Dozens of trees and utility wires were knocked down, closing several roads. At the height of the storm, 13,000 customers were without power.  Several properties reported significant roof damage.  In Spring Hill Acres, a large tree came through the roof of a home.  South London Derry and South Annville Township also reported similar damage.

High Wind in NORTHERN LYCOMING, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees and utility wires, closing dozens of roads throughout the county. Sporadic power outages were also reported county-wide.

High Wind in SOUTHERN LYCOMING, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees and utility wires, closing dozens of roads throughout the county. Sporadic power outages were also reported county-wide.

High Wind in MIFFLIN, PENNSYLVANIA
From 29-OCT-12 16:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees with widespread power outages reported county-wide.

High Wind in MONTOUR, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down trees with sporadic power outages reported county-wide.

High Wind in YORK, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down numerous trees and utility wires, closing many roads throughout the county. At height of storm, approximately 20,000 customers were without power. I-83 and PA Turnpike restricting tractor trailer travel speeds due to high winds. One mobile home was destroyed by a falling tree. Approximately 40 residential homes sustained minor to moderate structural damage.

Heavy Snow in SOMERSET, PENNSYLVANIA
From 30-OCT-12 20:00:00 to 31-OCT-12 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Strong upslope flow and cooling aloft changed rain to snow over the Laurel Highlands, mainly above 2200 feet in elevation. Heavy snow accumulations between 6 and 12 inches were reported, with locally higher amounts on the ridge-tops above 2800 ft. COOP stations at Laurel Summit and Mount Davis each recorded over a foot of snow.
An 81-year-old woman was killed when the car she was a passenger in slid off snow covered Kingwood Road in Upper Turkeyfoot Township and rolled over into a farm pond on the east side of Route 281. Both the driver and passenger were trapped. The driver, a 51-year-old Confluence woman, wasn't injured and tried to get the passenger out of the vehicle, but was unable. The passenger was pronounced dead at Somerset Hospital.

High Wind in NORTHUMBERLAND, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down trees with sporadic power outages reported county-wide.

High Wind in PERRY, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down numerous trees with several power outages reported county-wide. Two homes sustained structural damage (one from a falling tree) in the Marysville area.

High Wind in POTTER, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down numerous trees and utility wires, causing thousands of power outages county-wide. Numerous roads were also closed due to falling trees and wires.

High Wind in SCHUYLKILL, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down numerous trees and utility wires, causing widespread power outages county-wide. Numerous roads were also closed due to falling trees and wires.

High Wind in SNYDER, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down numerous trees and utility wires, causing widespread power outages county-wide. Numerous roads were also closed due to falling trees and wires.

High Wind in SULLIVAN, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down numerous trees and utility wires, causing widespread power outages county-wide. During the height of the storm, most of the county had lost power. Numerous roads were also closed due to falling trees and wires.

High Wind in TIOGA, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees and utility wires, causing sporadic power outages. A few roads were also closed due to falling trees and wires.

High Wind in BLAIR, PENNSYLVANIA
From 29-OCT-12 16:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees with scattered power outages reported county-wide. A few structures sustained minor damage.

High Wind in CAMBRIA, PENNSYLVANIA
From 29-OCT-12 17:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees causing power outages county-wide.

High Wind in CLEARFIELD, PENNSYLVANIA
From 29-OCT-12 17:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down several trees and utility wires, causing power outages county-wide.

High Wind in NORTHERN CLINTON, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Significant high wind damage was reported with peak gusts near 60 mph. The high winds knocked down numerous trees and utility wires, disrupting power to over 400 residents or about 10 percent of the county.

High Wind in SOUTHERN CLINTON, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Significant high wind damage was reported with peak gusts near 60 mph. The high winds knocked down numerous trees and utility wires, disrupting power to over 400 residents or about 10 percent of the county.

High Wind in COLUMBIA, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Minimal high wind damage was reported with approximately 6-7 roads closed due to downed trees and utility wires.

High Wind in CUMBERLAND, PENNSYLVANIA
From 29-OCT-12 15:00:00 to 30-OCT-12 03:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds caused widespread tree and power pole damage throughout the county, with numerous reports of power outages.

Flood in ADAMS, PENNSYLVANIA
From 29-OCT-12 11:00:00 to 30-OCT-12 07:15:00 (EST-5)
Location: TRUST
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rainfall brought widespread flooding to Adams County.  The first road closures began near 12 noon, with signicant flooding by 3pm.