A late season winter storm affected the region on March 11th and 12th. A deep upper trough digging across the central CONUS and Gulf low pressure riding up the eastern seaboard contributed to widespread precipitation. Precipitation initially began as rain in some areas, but potent dynamic cooling quickly changed precipitation over to snow.  A coupled jet and a frontogenesis axis oriented southwest to northeast across the Upper Ohio Valley contributed to strong vertical motion.  The heaviest snow generally fell during the overnight hours on the 11th to the morning hours of the 12th, with more scattered snow showers lingering therafter.
Snowfall was generally maximized along an axis from Zanesville through Wheeling, Pittsburgh, and then Forest County, PA.  Totals of 6 to 9 inches were common in this area, with slightly less to the northwest.  Terrain influences also aided accumulation in the higher elevations.

Winter Weather in FAYETTE, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A range of 4 to 6 inches of snow was reported.

Winter Weather in VENANGO, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A range of 3 to 5 inches of snow was reported, highest 6 miles southwest of Titusville.

Winter Weather in FOREST, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Reports of 5.5 inches of snow were received from near Tionesta and Marienville.

Winter Weather in CLARION, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A range of 5 to 6.5 inches of snow was reported.  Locations near Tylersburg and Knox received the higher totals.

Winter Weather in JEFFERSON, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Around five inches of snow fell in the county, with reports from Reynoldsville received.

Winter Weather in MERCER, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Five to 6.5 inches of snow was reported, with Hermitage on the higher end.

Winter Storm in WESTMORELAND RIDGES, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Five to 10 inches of snow was reported, with the highest total at Ligonier.

Winter Storm in BEAVER, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A range of 5 to 7.5 inches of snow was seen, with the higher total near Aliquippa.

Winter Storm in BUTLER, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A total of 6 to 8.5  inches of snow fell. Valencia and Butler were on the high end.

Winter Storm in ALLEGHENY, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A range of 5 to 9 inches was realized.  Higher totals were reported at Moon, Imperial, and Bridgeville.

Winter Storm in WASHINGTON, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow totals ranged from 6 to 8 inches. West Alexander, Hickory, and Canonsburg were on the higher end.

Winter Storm in GREENE, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A total of 6 to 7 inches was reported.  Waynesburg came in with the higher total.

Winter Storm in WESTMORELAND, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

The reported range was 5 to 7 inches, with New Kensington on the higher end.

Winter Storm in INDIANA, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Reports ranged from 4 to 8 inches, with the higher total at Homer City.

Winter Storm in FAYETTE RIDGES, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Mill Run reported eight inches of snow, and most other locations were in the 5 to 7 inch range.

Winter Storm in ARMSTRONG, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Totals of 5 to 7 inches fell, highest near Kittanning.

Winter Weather in LAWRENCE, PENNSYLVANIA
From 11-MAR-22 21:00:00 to 12-MAR-22 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Three to four inches of snow was reported.