In the early morning hours of Sunday, January 16th, a powerful polar front jet dug a deep trough into the Middle Mississippi Valley and into the lower Appalachian Range. Here some phasing occurred with the southern subtropical jet providing ample moisture into the developing system. The surface low then deepened as it tracked northeast along the eastern side of the Appalachian Range. As the system strengthened and lifted north, the northern fringe of precipitation began over the Pittsburgh area by 4 PM. As the system intensified, the deformation banded heavy snowfall set up along the PA/OH border northeast into the northern PA counties, and west into OH. Here is where the heaviest snow fell with some locations getting more than a foot of snow. An area of mid and upper level drying set up at the foothills of the Laurel Ridges into Fayette, Westmoreland, Greene, Washington, Marion, and Monongalia Counties. Here is where the dry slot set up cutting into the snowfall amounts ranging from 3 to 6 inches due to periods of sleet and freezing rain. This feature impacted the counties west of I-79 as well, but the mid level drying eventually shifted east shortly after midnight on the 17th as heavier snowfall developed back over the western PA counties.  The snow continued into Monday afternoon before dissipating in the lower elevations. Some topographic enhancement led to prolonged snowfall in the higher elevations of Pennsylvania and northern West Virginia into Monday evening.

Winter Storm in INDIANA, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A total of 6 to 10 inches of snow fell in most locations in the county.  Reports near Brush Valley and Pikes Peak reached around 11 inches.

Winter Storm in VENANGO, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Many reports of 9 to 12 inches of snow were received across the county.  Seneca and Venus were the locations with higher totals.

Winter Storm in BUTLER, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A foot of snow was reported 2 miles WSW of Butler, as well as at Valencia.  A CoCoRaHS observer near Cabot received 11 inches.  The rest of the reports mostly fell into the 6 to 10 inch range.

Winter Weather in FAYETTE, PENNSYLVANIA
From 16-JAN-22 14:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Three to five inches of snow fell in western Fayette County. A spotty glaze of icing also occurred, reported specifically at Juniata.

Winter Storm in WASHINGTON, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hickory received the high total of 9 inches of snow, with most other reports in the 6 to 8 inch range.

Winter Storm in CLARION, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thirteen inches of snow fell 7 miles northeast of Strattanville.  Several other reports of 8 to 11 inches were received across the county.

Winter Storm in FAYETTE RIDGES, PENNSYLVANIA
From 16-JAN-22 14:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Around eight inches of snow fell in the ridges of Fayette County, with a specific total reported at Ohiopyle.

Winter Storm in JEFFERSON, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Many reports of 7 to 11 inches of snow were received from across the county.  Locations near Brookville, South Timblin got the higher 11 inch totals.

Winter Storm in WESTMORELAND, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow totals on the west-facing slopes were in the 4 to 5 inch range, with 6 to 10 inches closer to the border with Allegheny County.  New Kensington was the highest at 11 inches.

Winter Storm in LAWRENCE, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Seven to ten inches of snow fell, with New Castle on the higher end of the range.

Winter Storm in MERCER, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Most snow totals were in the 9 to 12 inch range, with Jackson Center and Grove City getting the higher totals.

Winter Storm in WESTMORELAND RIDGES, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Seven to eleven inches were observed in the Fayette County ridges, with Ligonier the highest at 11.5 inches.

Winter Storm in ALLEGHENY, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Numerous reports of 6 to 10 inches of accumulation were received across the county, and spotty ice accretion of up to 0.10 inch was also reported.  The highest total of 11 inches was received from a location one mile west of Churchill. Also, a tenth of an inch of ice accretion was reported near Scott.

Winter Storm in ARMSTRONG, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Most accumulation totals were in the 6 to 9 inch range.  Locations near Bradys Bend and Shelocta reported the high total of close to 10 inches.

Winter Storm in FOREST, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Nine to fourteen inches of snow were reported in the county, with the high-end total occurring at Tionesta.

Winter Storm in BEAVER, PENNSYLVANIA
From 16-JAN-22 16:00:00 to 17-JAN-22 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Locations near Mayfield, Beaver Falls, and Dawson received the higher-end totals of 10 to 11 inches.  Most other locations in the county received 6 to 9 inches.

Winter Storm in GREENE, PENNSYLVANIA
From 16-JAN-22 14:00:00 to 17-JAN-22 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Four to five inches of snow fell across the county.  This was combined with around a tenth of an inch of ice accretion during the storm.