A winter storm brought heavy snow and freezing rain to the Poconos and an accumulating snow to the Lehigh Valley before it changed to sleet and then rain. Accumulations averaged around 6 inches in the Poconos, 2 to 6 inches in the Lehigh Valley and around an inch in the northern Philadelphia suburbs and Berks County. Ice accretions in the higher terrain of the Poconos averaged around one-third of an inch.
Snow began during the late evening of the 8th as far south as the northern Philadelphia suburbs and Berks County. As warmer air moved north, the snow changed to rain by around 3 a.m. EST in the northern Philadelphia suburbs and Berks County and around 4 a.m. EST in  the Lehigh Valley. During the transition in the Lehigh Valley, some sleet occurred. The snow changed to rain in the valleys and freezing rain in the higher terrain of the Poconos around 6 a.m. EST. In the higher terrain of the Poconos, precipitation changed to all rain around 9 a.m. EST. The rain ended by Noon EST on the 9th.
Schools were closed in Monroe County. Most schools had two hour delayed openings in Carbon County and the Lehigh Valley. The heavy wet snow caused spotty power outages in Carbon County.
Specific snowfall included 7.0 inches in Tobyhanna (Monroe County), 6.0 inches in Pocono Summit (Monroe County), 5.7 inches in Glendon (Northampton County), 5.0 inches in Lake Harmony (Carbon County), 4.9 inches in Lehighton (Carbon County), 3.0 inches in Springtown (Bucks County), 2.9 inches at the Lehigh Valley International Airport, 1.5 inches in Tatamy (Northampton County), 0.6 inches in Glenmoore (Chester County), 0.5 inches in Hamburg (Berks County) and 0.4 inches in Fleetwood (Berks County). Ice accretions in the Poconos were less than one quarter of an inch.
The winter storm was caused by a strong surge of relatively warmer and more moist air above a surface warm front associated with an intense low pressure system that moved through the Great Lakes. A weaker low pressure  system formed on the warm frontal boundary early in the morning of the 9th near the Virginia and North Carolina border. This slowed the advance of milder air into the higher terrain locations.

Winter Weather in CHESTER, PENNSYLVANIA
From 08-DEC-09 23:00:00 to 09-DEC-09 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Weather in MONTGOMERY, PENNSYLVANIA
From 08-DEC-09 23:00:00 to 09-DEC-09 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Weather in BUCKS, PENNSYLVANIA
From 08-DEC-09 23:00:00 to 09-DEC-09 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Weather in LEHIGH, PENNSYLVANIA
From 08-DEC-09 22:30:00 to 09-DEC-09 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 08-DEC-09 22:30:00 to 09-DEC-09 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in CARBON, PENNSYLVANIA
From 08-DEC-09 23:00:00 to 09-DEC-09 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in MONROE, PENNSYLVANIA
From 08-DEC-09 23:00:00 to 09-DEC-09 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BERKS, PENNSYLVANIA
From 08-DEC-09 22:00:00 to 09-DEC-09 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS