A series of low pressure systems combined with a high pressure system passing across nearby Canada to bring a winter storm of snow, sleet and freezing rain from the morning into the overnight on the 14th. Snowfall averaged 6 to 12 inches in the Poconos and Lehigh Valley, 3 to 6 inches in Berks County and the far western and northwestern Philadelphia suburbs and 1 to 4 inches in the local Philadelphia area. Ice accumulations averaged one-quarter to one-third of an inch from Berks County and the Lehigh Valley into the Philadelphia northwest suburbs and around one tenth of an inch in the local Philadelphia area and the Poconos. The combination caused extremely difficult traveling conditions as well as isolated power outages. It also was the second consecutive weekend that a winter storm affected Eastern Pennsylvania. Around Philadelphia several SEPTA commuter bus routes were suspended because of icy roads.
Precipitation types varied location by location with the most snow in the Poconos and the least around Philadelphia.  In the Poconos, snow began between 9 a.m. EST and 10 a.m. EST on the 14th and fell heavy at times during the late afternoon and evening. The snow changed to sleet late that evening and then to freezing rain before it ended overnight.  In Berks County, the Lehigh Valley and the far northwest Philadelphia suburbs, snow began during the late morning on the 14th and fell moderately at times during the mid to late afternoon. The snow changed to sleet and then freezing rain during the middle of the evening. Freezing rain then continued until the precipitation ended between 1 a.m. EST and 3 a.m. EST on the 15th.  In Philadelphia and the nearby suburbs, the snow began during the afternoon of the 14th and changed over briefly to sleet and then to freezing rain around 6 p.m. EST. The freezing rain then changed to rain during the mid to late evening and continued until precipitation ended overnight.
Representative snowfall included 12.0 inches in Tobyhanna (Monroe County), 10.0 inches in Albrightsville (Carbon County), 9.0 inches in Bangor (Northampton County), 8.0 inches in Schnecksville (Lehigh County), 7.0 inches in Nazareth and Forks Township (Northampton County), 6.8 inches at the Lehigh Valley International Airport, 6.5 inches in Saylorsburg (Monroe County), 6.3 inches in Palm (Montgomery County), 6.1 inches in Springtown (Bucks County), 6.0 inches in Marshalls Creek (Monroe County), 5.6 inches in Martins Creek (Northampton County), 5.5 inches in Wyomissing (Berks County), 4.5 inches in Hamburg (Berks County) and Sellersville (Bucks County), 4.2 inches in Gilbertsville (Montgomery County), 4.0 inches in Elverson (Chester County), 3.5 inches in Warwick (Chester County), 3.4 inches in Reading (Berks County), 3.2 inches in West Chester (Chester County), 3.0 inches in Royersford (Montgomery County), 2.8 inches in Hilltown Township (Bucks County), 2.6 inches in Wayne (Delaware County) and West Norriton (Montgomery County), 1.0 inch in Brookhaven (Delaware County) and Center City Philadelphia and 0.3 inches at the Philadelphia International Airport.
Ice accumulations included four tenths of an inch in Allentown (Lehigh County), Pottstown (Montgomery County) and Doylestown (Bucks County), three tenths of an inch in Reading (Berks County), one-quarter of an inch in Gilbertsville (Montgomery County), Bethlehem (Northampton County), two-tenths of an inch in East Coventry (Chester County) and Skippack (Montgomery County) and one-tenth of an inch in Brookhaven (Delaware County).
The winter storm was caused by a series of  low pressure systems, one emerging from the central Rockies and the second forming in the western Gulf of Mexico on the evening of the 13th. They reached Missouri and Mississippi respectively on the morning of the 14th. Meanwhile, a high pressure system with a fresh supply of cold air reached southern Quebec Province, Canada.  While the southern low pressure system weakened, the northern one reached the central Ohio Valley at 4 p.m. EST on the 14th as the center of the high pressure system started to cross the Saint Lawrence River Valley and slowly eased east during the evening and overnight. A new low pressure system was starting to form on the warm frontal boundary in North Carolina. This latter low pressure system started to intensify as the Ohio Valley low pressure system started to weaken. At 10 p.m. EST on the 14th, the former low pressure system reached the lower Chesapeake Bay.  This low became the main low pressure system and passed just east of Atlantic City, New Jersey at 1 a.m. EST on the 15th and eastern Long Island at 7 a.m. EST on the 15th.  The sequence of secondary formation helped to lock in colder air near the surface throughout most of Eastern Pennsylvania.

Winter Storm in MONROE, PENNSYLVANIA
From 14-DEC-13 09:00:00 to 15-DEC-13 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in CARBON, PENNSYLVANIA
From 14-DEC-13 09:00:00 to 15-DEC-13 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in NORTHAMPTON, PENNSYLVANIA
From 14-DEC-13 09:00:00 to 15-DEC-13 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in LEHIGH, PENNSYLVANIA
From 14-DEC-13 09:00:00 to 15-DEC-13 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in BERKS, PENNSYLVANIA
From 14-DEC-13 11:00:00 to 15-DEC-13 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in UPPER BUCKS, PENNSYLVANIA
From 14-DEC-13 10:00:00 to 15-DEC-13 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in LOWER BUCKS, PENNSYLVANIA
From 14-DEC-13 12:00:00 to 15-DEC-13 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in EASTERN MONTGOMERY, PENNSYLVANIA
From 14-DEC-13 13:00:00 to 15-DEC-13 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in WESTERN MONTGOMERY, PENNSYLVANIA
From 14-DEC-13 12:00:00 to 15-DEC-13 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in WESTERN CHESTER, PENNSYLVANIA
From 14-DEC-13 12:00:00 to 15-DEC-13 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in EASTERN CHESTER, PENNSYLVANIA
From 14-DEC-13 13:00:00 to 15-DEC-13 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in PHILADELPHIA, PENNSYLVANIA
From 14-DEC-13 12:00:00 to 14-DEC-13 23:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in DELAWARE, PENNSYLVANIA
From 14-DEC-13 13:00:00 to 14-DEC-13 23:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter