An upper trough combined with a coupled jet structure resulted in an impressive snow storm across the region. The resulting divergence aloft generated strong frontogenetically forced snow bands across the region.

Winter Storm in ALLEGHENY, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Up to 14 inches was observed in Wexford, PA by 3am 12/17/20. The official measurement at the NWS Pittsburgh office was 9.3 inches at midnight.

Winter Storm in ARMSTRONG, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Up to 16 inches fell in Armstrong County in 24 hours. A foot and half fell before midnight on 12/16/20; this measurement was made by a lead forecaster in Kepples, PA.

Winter Storm in BEAVER, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Up to 8 inches in 24 hours fell in portions of Beaver County.

Winter Storm in BUTLER, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Highest amount was 16 inches in 24 hours in Cabot, PA. Overall 8 to 12 inches fell across the county.

Winter Storm in CLARION, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Highest amount was 13.5 inches in Leeper, PA. Overall 9-12 inches was recorded across the county in 24 hours.

Winter Storm in FAYETTE RIDGES, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The local ski resort reported 14 inches on the morning of 12/17/20 in Champion, PA.

Winter Storm in FAYETTE, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Eight to ten inches of snow fell in the lower elevations of Fayette County in 24 hours.

Winter Storm in FOREST, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Up to 11 inches fell in portions of Forest County in 24 hours.

Winter Storm in GREENE, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Up to 9.5 inches of snow fell in 24 hours. Highest report (9.5 inches) came from Crucible, PA.

Winter Storm in INDIANA, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to 20 inches of snow fell in Indiana County in 24 hours. Highest amount was recorded in Waterman, PA. A range of 13-17 inches was reported across the county.

Winter Storm in JEFFERSON, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to 15 inches of snow fell in 24 hours. Highest amount was recorded by a trained spotter in Reynoldsville.

Winter Weather in LAWRENCE, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to 6 inches of snow fell in 24 hours.

Winter Weather in MERCER, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Up to 5 inches of snow fell in 24 hours. Highest amount in Hermitage, PA.

Winter Weather in VENANGO, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Up to 6 inches of snow fell in 24 hours.

Winter Storm in WASHINGTON, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Up to 11 inches of snow was recorded in Washington County in 24 hours.

Winter Storm in WESTMORELAND, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to 16 inches of snow was observed in Westmoreland County. Highest amount was near Derry, PA.

Winter Storm in WESTMORELAND RIDGES, PENNSYLVANIA
From 16-DEC-20 07:00:00 to 17-DEC-20 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Up to 14 inches of snow fell in the ridges of Westmoreland County. Highest report was near Donegal, PA.