Low pressure developed along a nearly stationary boundary draped across the Central Appalachians, and then lifted across the Mid-Atlantic states on February 7th.  The storm system brought rain initially on the 6th, but cold air filled in quickly behind the departing surface low during the nighttime hours, leading to a brief period of mixed precipitation, and then finally a change to all snow. Snow was most widespread during the morning hours, before tapering to more scattered snow showers outside of the ridges during the afternoon.  Snow finally ended in the higher elevations during the evening/overnight hours leading into February 8th.
With the associated upper trough taking on a negative tilt, and with support from coupled jets aloft and strong cold advection, snowfall rates were sufficient to produce several inches of accumulation across much of the forecast area. This system was thus the most significant winter storm of the 2019-2020 season for the NWS Pittsburgh area of responsibility.

Winter Weather in ALLEGHENY, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Three to five inches of accumulation was the general range of numerous reports across the county.  The official measurement at the NWS office in Moon was 4.8 inches as of 5 PM.

Winter Weather in ARMSTRONG, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Three to six inches of accumulation was the range provided by reports across the county, with the highest total of six inches recorded by a couple of social media users near Ford City.

Winter Weather in BEAVER, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Accumulation totals ranged roughly from 2.5 to 4.5 inches across the county.  The high report of 4.6 inches was received from a social media user at Industry.

Winter Weather in BUTLER, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A range of 2 to 4 inches of accumulation was noted across the county.  A CoCoRaHS observer recorded 4 inches 2 miles NNE of Butler.

Winter Weather in CLARION, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Most reports across the county ranged from 2 to 5 inches, although a high report of 6 inches at New Bethlehem was provided by a social media user.

Winter Weather in FAYETTE RIDGES, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Five to seven inches of accumulation were reported, with a high of 7.6 recorded by a CoCoRaHS observer at Farmington.

Winter Weather in FOREST, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A total of 2 to 4 inches of accumulation was noted, with the high of 4 inches observed by a CoCoRaHS observer 7 miles SSE of Tionesta.

Winter Weather in GREENE, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Five inches of accumulation were reported at Mather and Waynesburg via social media, with a county range of 3 to 5 inches overall.

Winter Weather in INDIANA, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

The high report of 6.5 inches was recorded by a trained spotter at Brush Valley.  A range of 5 to 6.5 inches was noted countywide.

Winter Weather in JEFFERSON, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A total of 5 to 7 inches of snow was reported in the county, with the high total of 7 inches reported by the public near Punxsutawney.

Winter Weather in LAWRENCE, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

One to two inches of snow accumulation was reported in the county by the public.

Winter Weather in MERCER, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

One to two inches of snow accumulation was reported in the county by the public.

Winter Weather in VENANGO, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Two to three inches of accumulation was reported in the county, with CoCoRaHS observers near Cooperstown and Titusville near the top end of the range.

Winter Weather in WASHINGTON, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Numerous reports between 3.5 and 5.5 inches were reported in the county, with social media users in Grapeville and Greensburg at the top end of the range.

Winter Weather in WESTMORELAND, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A range of 3 to 5.5 inches of snow was reported, with Grapeville and Greensburg at the high end of the range via social media users.

Winter Weather in WESTMORELAND RIDGES, PENNSYLVANIA
From 07-FEB-20 04:00:00 to 07-FEB-20 19:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Two to four inches of snow accumulation were reported, with the higher totals at Donegal.