An Alberta Clipper low pressure system dropped light snow across Eastern Pennsylvania during the day on the 7th. Accumulations averaged 1 to 3 inches. The recent unseasonably cold weather made it easier for the snow to accumulate on roadways and bridges and overpasses during the early morning and also during heavier bursts of snow. Consequently untreated roadways were slippery and many accidents were reported, especially during the morning commute. Snow began falling between 3 a.m. and 5 a.m. EST on the 7th across Eastern Pennsylvania and ended between 3 p.m. and 5 p.m. EST later that day.
One of the worst reported accidents with injuries occurred in Towamensing Township (Carbon County) on Pennsylvania State Route 209. A pickup truck slid sideways into oncoming traffic where it crashed with another vehicle and then slammed into a pole. The oncoming car was then struck from behind by another vehicle which then skidded off the road into a tree. Three people were injured and hospitalized. Schools in Easton (Northampton County) and Catasauqua (Lehigh County) never opened. Several Bucks County school districts cancelled afternoon and evening activities.
Actual accumulations included 2.5 inches in Reading (Berks County) and Fricks (Bucks County), 2.3 inches in Boothwyn (Delaware County), 2.0 inches in Downingtown (Chester County), 1.8 inches in Trappe (Montgomery County), Boyertown (Berks County) and Levittown (Bucks County), 1.7 inches at the Philadelphia International Airport, 1.5 inches in Jim Thorpe (Carbon County), Roxborough (Philadelphia County) and Wynnewood (Montgomery County), 1.4 inches at the Lehigh Valley International Airport, 1.0 inch in Effort (Monroe County) and 0.8 inches in Martins Creek (Northampton County).

The Alberta Clipper as it name implies moved rapidly southeast from southeastern Montana at 7 a.m. EST on March 6th, to near Saint Louis, Missouri at 7 a.m. EST on March 7th, to the Virginia/West Virginia border at 1 p.m. EST on March 7th, to about 150 miles east of Virginia Beach, Virginia at 7 p.m. EST on March 7th. The rapid movement of the low pressure system prevented heavier snow from falling.

Winter Weather in BERKS, PENNSYLVANIA
From 07-MAR-07 04:00:00 to 07-MAR-07 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BUCKS, PENNSYLVANIA
From 07-MAR-07 04:00:00 to 07-MAR-07 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in CARBON, PENNSYLVANIA
From 07-MAR-07 03:00:00 to 07-MAR-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in CHESTER, PENNSYLVANIA
From 07-MAR-07 04:00:00 to 07-MAR-07 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in DELAWARE, PENNSYLVANIA
From 07-MAR-07 05:00:00 to 07-MAR-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 07-MAR-07 03:30:00 to 07-MAR-07 15:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 07-MAR-07 03:30:00 to 07-MAR-07 15:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MONROE, PENNSYLVANIA
From 07-MAR-07 03:00:00 to 07-MAR-07 16:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MONTGOMERY, PENNSYLVANIA
From 07-MAR-07 04:00:00 to 07-MAR-07 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in PHILADELPHIA, PENNSYLVANIA
From 07-MAR-07 05:00:00 to 07-MAR-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter