A nearly seventy millibar surface pressure difference between an intense low pressure system moving through the Canadian Maritimes (it bottomed at 963 millibars at 1 p.m. EST on the 25th in the Gulf of Saint Lawrence) and a high pressure system in the Central Plains produced over twenty-four hours of strong winds in the Poconos and nearly twenty-four hours of strong winds elsewhere across Eastern Pennsylvania from the evening on the 24th through the evening on the 25th. Peak wind gusts averaged 45 to 50 mph and the strong winds downed weak trees, tree limbs and power lines and caused scattered outages. A downed tree by itself knocked out power to 420 Pennsylvania Power and Light customers in Franconia (Montgomery County). In the Lehigh Valley, about 750 Pennsylvania Power and Light customers lost power, most of them in Bethlehem (Northampton County) after a downed tree took down wires.
Peak wind gusts included 54 mph in Nesquehoning (Carbon County), 49 mph in Reading (Berks County), 48 mph in Mount Pocono (Monroe County) and the Philadelphia International Airport, 46 mph at the Lehigh Valley International Airport and 45 mph in Pottstown (Montgomery County). The strong winds started shortly after a cold frontal passage moved through Eastern Pennsylvania during the late afternoon of the 24th and persisted into the evening on the 25th, ending last in the Poconos. Winds started to slowly diminish after the low pressure system started to weaken and moved farther away from Pennsylvania.

Strong Wind in MONROE, PENNSYLVANIA
From 24-FEB-12 21:00:00 to 26-FEB-12 00:00:00 (EST-5)
Magnitude: 42.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in LEHIGH, PENNSYLVANIA
From 24-FEB-12 23:00:00 to 25-FEB-12 18:00:00 (EST-5)
Magnitude: 40.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in CARBON, PENNSYLVANIA
From 24-FEB-12 21:00:00 to 26-FEB-12 00:00:00 (EST-5)
Magnitude: 47.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Strong Wind in NORTHAMPTON, PENNSYLVANIA
From 24-FEB-12 23:00:00 to 25-FEB-12 18:00:00 (EST-5)
Magnitude: 40.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in BERKS, PENNSYLVANIA
From 24-FEB-12 22:00:00 to 25-FEB-12 18:00:00 (EST-5)
Magnitude: 43.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in PHILADELPHIA, PENNSYLVANIA
From 25-FEB-12 01:00:00 to 25-FEB-12 19:00:00 (EST-5)
Magnitude: 42.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in DELAWARE, PENNSYLVANIA
From 25-FEB-12 01:00:00 to 25-FEB-12 19:00:00 (EST-5)
Magnitude: 42.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in BUCKS, PENNSYLVANIA
From 25-FEB-12 00:00:00 to 25-FEB-12 19:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in MONTGOMERY, PENNSYLVANIA
From 24-FEB-12 23:00:00 to 25-FEB-12 19:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in CHESTER, PENNSYLVANIA
From 24-FEB-12 22:00:00 to 25-FEB-12 18:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Mesonet