A winter weather event that fell mainly as snow in the Poconos and Lehigh Valley and a wintry mix in the rest of Eastern Pennsylvania became predominately freezing rain in and around Philadelphia. This caused numerous accidents during the morning commute on the 10th especially in the greater Philadelphia Metropolitan Area. Snowfall from the far northern Philadelphia suburbs through the Poconos averaged 1 to 2 inches. But it was the around one tenth of an inch of ice that fell around Philadelphia that had the greatest impact.
In the Philadelphia northern suburbs, the Lehigh Valley, Berks County and the Poconos, precipitation started as snow from the Poconos southward between 2 a.m. EST and 5 a.m. EST on the 10th. Precipitation changed to sleet in Berks County and the northern Philadelphia suburbs between 9 a.m. EST and 10 a.m. EST. All precipitation ended from north to south between 10 a.m. EST and 11 a.m. EST that morning.  In the local Philadelphia area, precipitation started briefly as snow around 5 a.m. EST, but changed to sleet quickly and then freezing rain between 6 a.m. EST and 8 a.m. EST. The freezing rain changed to plain rain between 10 a.m. EST and 11 a.m. EST that morning and ended early that afternoon.
In one of the worst tie-ups of the morning, in Delaware County, traffic was stalled southbound on the Media Bypass (U.S. Route 1) after a multi-vehicular accident shut down the road at its intersection with Pennsylvania State Route 252.  Philadelphia International Airport issued a full ground stop until 930 a.m. EST due to icy conditions on the runways. Some SEPTA commuter bus lines had to be detoured because of icy roadways. The Walt Whitman Bridge connecting Philadelphia to Camden County was closed due to icy conditions and a multi-vehicular accident for one hour. In Berks County, accidents required road closures in Muhlenberg, Lower Alsace and Exeter Townships. In Bern Township, the southbound ramp to U.S. 222 was closed after a pick-up truck flipped over and a woman was injured. A motorist was injured on Interstate 176 in Robeson Township, after a spinning vehicle crossed the median and collided with the vehicle he was driving. There were also multiple accidents on Pennsylvania State Route 183 and U.S. Route 222 in and around Reading.

Representative ice accumulation included 0.13 inches in Devon (Chester County) and 0.10 inches in Glen Mills (Delaware County). Representative snowfall included 2.0 inches in Perkasie (Bucks County), 1.9 inches in Albrightsville (Carbon County), 1.7 inches in Boyertown (Berks County), 1.3 inches in Limerick (Montgomery County), 1.1 inches at the Lehigh Valley International Airport, 1.0 inch in Phoenixville (Chester County) and Jim Thorpe (Carbon County), 0.8 inches in Forks Township (Northampton County) and 0.5 inches in Saylorsburg (Monroe County) and Wayne (Delaware County).
The wintry mix was caused by the combination of an approaching warm front and the return flow off the Atlantic Ocean from the departing arctic high. Extremely cold weather preceding this event made it easier for the rain to freeze on contact, even in places where air temperatures were slightly above freezing.

Winter Weather in BERKS, PENNSYLVANIA
From 10-JAN-14 02:00:00 to 10-JAN-14 10:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in CARBON, PENNSYLVANIA
From 10-JAN-14 02:00:00 to 10-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MONROE, PENNSYLVANIA
From 10-JAN-14 02:00:00 to 10-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 10-JAN-14 03:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 10-JAN-14 03:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WESTERN CHESTER, PENNSYLVANIA
From 10-JAN-14 05:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WESTERN MONTGOMERY, PENNSYLVANIA
From 10-JAN-14 05:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in UPPER BUCKS, PENNSYLVANIA
From 10-JAN-14 05:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LOWER BUCKS, PENNSYLVANIA
From 10-JAN-14 05:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in EASTERN MONTGOMERY, PENNSYLVANIA
From 10-JAN-14 05:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in PHILADELPHIA, PENNSYLVANIA
From 10-JAN-14 05:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in DELAWARE, PENNSYLVANIA
From 10-JAN-14 05:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in EASTERN CHESTER, PENNSYLVANIA
From 10-JAN-14 05:00:00 to 10-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter