Strong to high southeasterly winds affected Eastern Pennsylvania during the morning of the 25th.  Peak wind gusts averaged 45 to 50 mph, except in Philadelphia and Berks Counties where they averaged around 60 mph. The strong winds caused numerous power outages as the combination of the rain and wind helped knock down weak trees, tree limbs and power lines. About 74,000 homes and businesses lost power.
PECO Energy reported about 65,000 homes and businesses lost power in southeastern Pennsylvania including 12,000 in Delaware County (centered around Concord and Middletown) and 10,000 in Bucks County (centered around the Makefields). In Bucks County, a shed was blown off its foundation in Bristol Township. In Delaware County, a pine tree damaged the roof of one home in Drexel Hill. In Philadelphia, a truck was overturned by the wind on the Walt Whitman Bridge. The eastbound lanes were closed between 11 a.m. and 3 p.m. EST. Across the Delaware River, trucks were restricted from crossing the Betsy Ross and Commodore Barry Bridges. In Berks County, about 9,000 homes and businesses lost power. One of the greatest concentrations was in Wyomissing. All power was restored by the 26th.
Peak wind gusts included 62 mph at the Philadelphia International Airport, 60 mph in Vinemont (Berks County), 51 mph in Reading (Berks County), 48 mph at the Lehigh Valley International Airport, 46 mph at the Northeast Philadelphia Airport, 44 mph in Mount Pocono (Monroe County) and 41 mph in Doylestown (Bucks County).
The strong to high winds were caused by a tight surface pressure gradient (difference) between a low pressure system that was moving north just to the east of the central Appalachians and a high pressure system over the western Atlantic Ocean. The strong southerly flow started to mix down to the surface after the low pressure system���s warm front moved north of the state. The winds subsided during the afternoon as the low pressure system���s cold front approached the area and the area of strong winds between 3000 feet and 5000 feet moved away from Eastern Pennsylvania.

Strong Wind in BUCKS, PENNSYLVANIA
From 25-JAN-10 07:00:00 to 25-JAN-10 12:00:00 (EST-5)
Magnitude: 43.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Strong Wind in MONROE, PENNSYLVANIA
From 25-JAN-10 08:00:00 to 25-JAN-10 12:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in CARBON, PENNSYLVANIA
From 25-JAN-10 08:00:00 to 25-JAN-10 12:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Newspaper

Strong Wind in MONTGOMERY, PENNSYLVANIA
From 25-JAN-10 07:00:00 to 25-JAN-10 12:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in CHESTER, PENNSYLVANIA
From 25-JAN-10 07:00:00 to 25-JAN-10 12:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in NORTHAMPTON, PENNSYLVANIA
From 25-JAN-10 08:00:00 to 25-JAN-10 12:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in LEHIGH, PENNSYLVANIA
From 25-JAN-10 08:00:00 to 25-JAN-10 12:00:00 (EST-5)
Magnitude: 42.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: ASOS

High Wind in BERKS, PENNSYLVANIA
From 25-JAN-10 08:00:00 to 25-JAN-10 09:00:00 (EST-5)
Magnitude: 52.00 MG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in PHILADELPHIA, PENNSYLVANIA
From 25-JAN-10 09:00:00 to 25-JAN-10 10:00:00 (EST-5)
Magnitude: 54.00 MG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in DELAWARE, PENNSYLVANIA
From 25-JAN-10 07:00:00 to 25-JAN-10 12:00:00 (EST-5)
Magnitude: 43.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper