A wintry mix of sleet and freezing rain and even some snow in the Poconos occurred at the onset of precipitation associated with a strong nor'easter during the morning of the 9th.  Snow and sleet accumulations in the Poconos averaged around an inch or less while ice accumulations from the Philadelphia northern suburbs through the Poconos averaged between one-tenth and two-tenths of an inch.  Untreated roadways and walkways were hazardous.  Icy roadways were reported in Marshalls Creek (Monroe County).
In the Poconos, precipitation started as snow between 4 a.m. EST and 6 a.m. EST on the 9th. It changed over to freezing rain in all areas between 6 a.m. EST and 730 a.m. EST and to plain rain by 9 a.m. EST on the 9th.  In the Philadelphia northern suburbs, Berks County and the Lehigh Valley, precipitation started briefly as sleet from south to north between 1 a.m. EST and 4 a.m. EST on the 9th. Precipitation then changed to freezing rain within an hour of its starting time and then to plain rain between 4 a.m. EST and 6 a.m. EST on the 9th.
Snowfall included 1.5 inches in Mount Pocono (Monroe County), 1.0 inch in Pocono Summit (Monroe County), 0.8 inches in Tobyhanna (Monroe County) and 0.2 inches in Stroudsburg (Monroe County).  Ice accumulations included .15 inches in Forks Township (Northampton County) and .05 inches in Martins Creek (Northampton County).
The cold air, especially near the surface, was supplied by a high pressure system that moved across the southern tier of Canada and reached the Canadian Maritimes overnight on the 8th. Meanwhile, a low pressure system formed off the Carolina coastal waters on the 8th. It tracked northward and deepened as it reached the Delmarva coastal waters at 7 a.m. EST on the 9th. The low pressure system deepened 12 millibars in six hours and was off the New Jersey coastal waters at 1 p.m. EST on the 9th. The track and rapid intensification helped bring warmer air near the surface into Eastern Pennsylvania and changed precipitation to plain rain. The low pressure system stopped intensifying and drifted off to the northeast reaching the Rhode Island coastal waters during the evening of the 9th and eastern Massachusetts around Midnight EST on the 10th.

Winter Weather in UPPER BUCKS, PENNSYLVANIA
From 09-DEC-14 01:30:00 to 09-DEC-14 06:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winter Weather in WESTERN CHESTER, PENNSYLVANIA
From 09-DEC-14 01:00:00 to 09-DEC-14 05:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Winter Weather in WESTERN MONTGOMERY, PENNSYLVANIA
From 09-DEC-14 01:30:00 to 09-DEC-14 05:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BERKS, PENNSYLVANIA
From 09-DEC-14 03:00:00 to 09-DEC-14 06:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winter Weather in LEHIGH, PENNSYLVANIA
From 09-DEC-14 03:00:00 to 09-DEC-14 06:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 09-DEC-14 03:00:00 to 09-DEC-14 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winter Weather in CARBON, PENNSYLVANIA
From 09-DEC-14 04:00:00 to 09-DEC-14 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winter Weather in MONROE, PENNSYLVANIA
From 09-DEC-14 04:30:00 to 09-DEC-14 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS