Cold surface temperatures were already in place across the region at least 24 hours leading up to this event.  Surface high pressure allowed high temperatures to only reach near freezing while low temperatures bottomed out in the mid-20s. A closed upper level low formed just north of Texas on November 14th and tracked northeast. An abundant amount of moisture from the Gulf of Mexico traveled with the system into the northeast United States. Freezing rain eventually transitioned to snow when northwest flow began on the backside of the surface low. Four to seven inches of snow was measured north of I-80 and in the higher elevations, meanwhile 1 to 3 inches of snow happened elsewhere.

Winter Weather in ALLEGHENY, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Reported by: NWS Employee

The NWS Pittsburgh office has light icing in parking lot; cars glazed over. Another NWS Employee measured 0.01 inches of freezing rain at their home in Lawrenceville,PA. The Pittsburgh International Airport measured a trace. Other reported areas impacted by glazed ice from the public: McCandless Township, McKeesport, Bethel Park, Brentwood, Crafton, Avalon, West Mifflin, Dormont, Forest Grove. 16,000 customers were without power across the county. Source: https://pittsburgh.cbslocal.com/2018/11/16/winter-storm-power-outages-thousands-affected/.

Winter Weather in GREENE, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Reported by: Emergency Manager

In Waynesburg, there was ice glazing on vehicles reported by the Emergency Manager.

Winter Weather in WASHINGTON, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Reported by: Public

Traces of ice from freezing rain were observed at Burgettstown, the city of Washington, McMurray, Cecil, and Charleroi.

Winter Weather in FAYETTE, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Reported by: Public

A trace of freezing rain was reported by the public (via social media) in the following areas: Uniontown, Vanderbilt, and Fairchance.

Winter Storm in FAYETTE RIDGES, PENNSYLVANIA
From 15-NOV-18 11:07:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to 0.25 inches of ice was measured across the ridges of Fayette County. A trained spotter in Point Breeze reported ice on trees was bringing down limbs in the late afternoon. Freezing rain eventually switched over to sleet. Other areas that reported ice: Indian Head, Ohioplye, Mill Run, and Normalville.

Winter Weather in BEAVER, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reports of freezing rain across Beaver county; reports made early to late morning on November 15th. Freezing rain switched over over to snow; 2 inches of snow reported in Knob at 10am November 16th. 3,000 customers were also without power. Source: https://pittsburgh.cbslocal.com/2018/11/16/winter-storm-power-outages-thousands-affected/.

Winter Weather in BUTLER, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Freezing rain started the morning of November 15th and eventually turned over to snow. By November 16th 2 to 3 inches of snow was reported. Power outages and large tree limbs were down across the county. 56,000 West Penn customers were without power. 16,000 Duquesne Light customers were also without power. Source: https://pittsburgh.cbslocal.com/2018/11/16/winter-storm-power-outages-thousands-affected/.

Winter Weather in ARMSTRONG, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Freezing rain was reported the morning of November 15th across the county. Freezing rain changed to sleet then to snow. 1-3 inches of snow accumulated on top of the ice. 5,000 customers were without power across the county. Source: https://pittsburgh.cbslocal.com/2018/11/16/winter-storm-power-outages-thousands-affected/.

Winter Weather in LAWRENCE, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Freezing rain started the morning of November 15th. An estimate of 0.2 inches of ice was reported by the public in Mayville. Freezing rain switched over to snow; 1 to 3 inches of snow accumulated on top of the ice the morning of November 16th.

Winter Weather in MERCER, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Freezing rain started the morning of November 15th. Eventually 2-4 inches of snow accumulated the morning of November 16th.

Winter Weather in VENANGO, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A quarter inch of ice has accumulated from freezing rain by the afternoon of November 15th. Freezing rain eventually switched over to snow. 2-3 inches of snow accumulated by the morning of November 16th.

Winter Storm in CLARION, PENNSYLVANIA
From 15-NOV-18 03:27:00 to 16-NOV-18 04:29:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A combination of ice and snow accumulated November 15 into the 16th. A quarter inch of ice was measured by the Department of Transportation in Shippenville. 4 to 6 inches of snow was measured across the county--higher amounts north of I-80.

Winter Storm in FOREST, PENNSYLVANIA
From 15-NOV-18 03:27:00 to 16-NOV-18 04:29:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A combination of ice and snow accumulated November 15 and 16th. Areas of the county measured 4 to 6 inches of snow. A quarter of an inch of freezing rain was measured in Marienville by the Department of Transportation.

Winter Storm in INDIANA, PENNSYLVANIA
From 15-NOV-18 11:07:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A quarter of an inch of ice accumulated the evening of November 15th. Two to three inches of snow was measured across the county the morning of November 16th.

Winter Storm in WESTMORELAND RIDGES, PENNSYLVANIA
From 15-NOV-18 11:07:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

Three to five inches of snow fell across the ridges in 24 hours. A quarter of an inch of ice also accumulated in regions the evening of November 15th.

Winter Weather in WESTMORELAND, PENNSYLVANIA
From 14-NOV-18 14:47:00 to 16-NOV-18 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

One to three inches of snow accumulated across the county. A glazing of freezing rain accumulated the morning of November 15th.

Winter Storm in JEFFERSON, PENNSYLVANIA
From 15-NOV-18 03:27:00 to 16-NOV-18 04:29:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A combination of snow (up to 4 inches), sleet (1 inch), and ice (up to 0.25 inches) accumulated in a 24 hour period.