A double shot of wintry precipitation affected Eastern Pennsylvania mainly during the evening of the 15th and again during the daytime hours of the 16th. Total snowfall from both events averaged one to three inches. The first shot of precipitation started as snow late in the afternoon of the 15th. It changed over to freezing rain around the local Philadelphia area just before it ended. Precipitation ended by midnight EST on the 16th. The heaviest snowfall with the first band affected lower Montgomery and Bucks Counties. The second shot of precipitation fell as snow and lasted for about five hours during the daytime on the 16th. Around a half inch to inch of additional snow fell. Untreated roadways were slippery, especially during the first precipitation shot as it fell at night.
Representative snowfall included 3.4 inches in Furlong (Bucks County), 3.2 inches in Williams Township (Northampton County), 2.7 inches in Trappe (Montgomery County), 2.0 inches in Drexel Hill (Delaware County), Rockledge (Philadelphia County) and Elkins Park (Montgomery County) , 1.8 inches in Doylestown (Bucks County), 1.5 inches at the Franklin Institute (Philadelphia County) and Harleysville (Montgomery County), 1.3 inches art the Lehigh Valley International Airport and 1.0 inch at the Philadelphia International Airport.
The double shot of wintry precipitation was caused by a low pressure system and its upper level support. The low pressure system moved from the Ohio Valley on the morning of the 15th northeast into western Pennsylvania during the early evening of the 15th. A new low pressure system formed on the triple point of its occluded, warm and cold fronts in Virginia early that evening. This low pressure system moved northeast and was off the New Jersey coast shortly after Midnight EST on the 16th ending the first shot of precipitation. The second shot of precipitation occurred as an upper level low moved across the southeast part of the state during the daytime hours on the 16th.

Winter Weather in DELAWARE, PENNSYLVANIA
From 15-FEB-10 16:00:00 to 16-FEB-10 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in PHILADELPHIA, PENNSYLVANIA
From 15-FEB-10 16:00:00 to 16-FEB-10 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MONTGOMERY, PENNSYLVANIA
From 15-FEB-10 16:30:00 to 16-FEB-10 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BUCKS, PENNSYLVANIA
From 15-FEB-10 17:00:00 to 16-FEB-10 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 15-FEB-10 18:00:00 to 15-FEB-10 21:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 15-FEB-10 18:00:00 to 15-FEB-10 22:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 16-FEB-10 07:30:00 to 16-FEB-10 12:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 16-FEB-10 07:30:00 to 16-FEB-10 12:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BUCKS, PENNSYLVANIA
From 16-FEB-10 08:00:00 to 16-FEB-10 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MONTGOMERY, PENNSYLVANIA
From 16-FEB-10 07:30:00 to 16-FEB-10 12:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in PHILADELPHIA, PENNSYLVANIA
From 16-FEB-10 07:30:00 to 16-FEB-10 12:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in DELAWARE, PENNSYLVANIA
From 16-FEB-10 07:30:00 to 16-FEB-10 12:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter