A wintry mix of sleet and freezing rain fell across most of Eastern Pennsylvania on the 1st. Sleet accumulations ranged from an inch or two in the Poconos to little if any toward Philadelphia. Ice accretions reached up to around half an inch in the Poconos. The wintry mix caused many accidents. In the Poconos, the accretion of ice on tree limbs and power lines caused scattered outages. Many schools north and west of Philadelphia were closed.
Precipitation began as a mixture of sleet and freezing rain between 5 a.m. and 7 a.m. EST across most of Eastern Pennsylvania. In the local Philadelphia area, precipitation started as plain rain. As warm air moved in northward at the surface, the freezing rain changed to plain rain in the Philadelphia northwest suburbs by 8 a.m. EST and in Berks County and the Lehigh Valley by 10 a.m. EST.  Ice accretions averaged around one tenth of an inch in the Philadelphia northwest suburbs and two tenths of an inch in Berks County and the Lehigh Valley. In the Poconos, the cold air was never completely scoured and precipitation fell as freezing rain over the plateau region until it ended that evening.
In Monroe County layers of ice burdened branches and utility wires on February 1st, which caused power outages. Wires sagged or snapped under the weight of the ice, which resulted in some pole fires during the night of February 1st. A multi-vehicle crash at the start of the evening rush hour on February 1st forced the closure of Interstate 380 south between the Tobyhanna and Gouldsboro exits. Back roads were tricky as motorists had to dodge downed branches.  In Lehigh County, a hit-and-run accident occurred in Washington Township as icy road conditions resulted from freezing rain. The crash happened at 6:00 PM EST as an unknown driver was traveling west on Main Street in Slatedale and lost control of the vehicle due to icy patches on the road surface. The vehicle crashed into a building on Main Street and the driver left the scene. In Berks County 911 dispatchers handled more than two dozen calls which reported accidents between 5:30 AM EST and 8:00 AM EST, due to freezing rain icing up roadways. Many of the accidents involved vehicles sliding off icy roads into ditches or trees. There were no reports of serious injuries. Westbound traffic on Interstate 78 was blocked for about three hours near the Krumsville exit about 7:00 AM EST by a crash which involved several tractor-trailers. Eastbound Interstate 78 traffic was not moving much, because one lane was blocked during much of the morning as a result of crashes. Also, Interstate 78 was closed between the Kutztown exit 35 (Route 737) and Lenhartsville exit 40 (Route 143) for several hours because a tractor-trailer accident. It reopened around 9:30 AM EST. A multi-vehicle crash occurred at about 5:45 AM EST at Pricetown Road and Route 73 in Ruscombmanor Township. In Muhlenberg Township, Crystal Road was closed near Spring Valley Road after a four vehicle, chain reaction, crash occurred at about 6:15 AM EST. Several other vehicles slid into walls or other cars on the road. No one was injured, but the road remained closed for more than two hours because tow trucks had a difficult time getting up the hill to remove the vehicles. In Brecknock Township, a sport utility vehicle slid off Maple Grove Road near Alleghenyville Road at about 6:40 AM EST, then turned onto its side after going down a 10-foot embankment. The driver was not hurt. In Chester County the State Police barracks at Embreeville reported 23 crashes in the area between 5:00 AM EST and 9:00 AM EST though most were minor.
The low pressure system that caused the wintry mix moved from Mississippi on the evening of January 31st northeast through the Ohio valley on the morning of the 1st. It reached western Pennsylvania during the afternoon of the 1st and passed near Scranton, Pennsylvania at 7 p.m. EST on the 1st before heading northeast into New York State.  Preceding this low pressure system, a fairly strong high pressure system (around 1040 millibars) was able to leave a large pool of cold air in place at the surface across Eastern Pennsylvania that was difficult for the low pressure system to scour.

Winter Storm in CARBON, PENNSYLVANIA
From 01-FEB-08 07:00:00 to 01-FEB-08 21:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in MONROE, PENNSYLVANIA
From 01-FEB-08 07:00:00 to 01-FEB-08 21:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BERKS, PENNSYLVANIA
From 01-FEB-08 05:00:00 to 01-FEB-08 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 01-FEB-08 05:30:00 to 01-FEB-08 09:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 01-FEB-08 05:30:00 to 01-FEB-08 09:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in CHESTER, PENNSYLVANIA
From 01-FEB-08 05:00:00 to 01-FEB-08 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MONTGOMERY, PENNSYLVANIA
From 01-FEB-08 05:00:00 to 01-FEB-08 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BUCKS, PENNSYLVANIA
From 01-FEB-08 06:00:00 to 01-FEB-08 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter