Strong to high winds occurred across Eastern Pennsylvania through the morning into the afternoon on the 31st. Peak wind gusts reached between 45 mph and 60 mph and downed weak trees, tree limbs and power lines and caused scattered outages. All of the high winds and most of the highest wind gusts occurred in the south to southwest flow preceding a cold frontal passage during the early morning on the 31st. However, strong wind gusts near 50 mph continued in the westerly flow following the cold frontal passage during the morning and into the  afternoon on the 31st. The cold front moved through the area between 4 a.m. EST and 6 a.m. EST on the 31st. In Bucks County, trees and or poles were knocked down in Bedminster, Buckingham, Hilltown, Richland and West Rockhill Townships. In Montgomery County, two roadways were closed in Cheltenham Township because of an uprooted tree. There was also a downed tree along Sunnyside Avenue in Lower Providence Township.
Peak wind gusts included 58 mph in West Chester (Chester County), 57 mph in Newtown Square (Delaware County), 54 mph in Coatesville (Chester County), 53 mph in Mount Pocono (Monroe County) and Overbrook (Philadelphia County), 52 mph at the Philadelphia International Airport, 51 mph in Bossardsville (Monroe County), 50 mph in Springfield Township (Montgomery County), 49 mph in Reading (Berks County), Perkasie (Bucks County) and the Lehigh Valley International Airport, 48 mph in Forks Township (Northampton County) and Metztown (Carbon County)  and 45 mph in Doylestown (Bucks County).

The strong to high winds were caused by a land bombing low pressure system that intensified rapidly as it moved through the Great Lakes on January 30th and into Quebec Province on January 31st. The central pressure of the low pressure system over Illinois deepened from 992 millibars at 7 a.m. EST on the 30th to 968 millibars at 7 a.m. EST on the 31st when it was in Quebec Province. The low pressure system continued to deepen and the following morning, the pressure was 944 millibars as it was crossing the Labrador Sea (The lowest analyzed pressure with this system was 940 millibars.). The rapid deepening of the surface low intensified the southerly flow preceding its cold front and then the pressure gradient (difference) between the low pressure system and a high pressure system entering the Northern Plains continued strong winds into the afternoon of the 31st. The low pressure system moved far enough away from Pennsylvania for the strong winds to cease later that day.

Strong Wind in LEHIGH, PENNSYLVANIA
From 31-JAN-13 02:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 43.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in NORTHAMPTON, PENNSYLVANIA
From 31-JAN-13 02:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 43.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in BERKS, PENNSYLVANIA
From 31-JAN-13 02:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 43.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: ASOS

Strong Wind in DELAWARE, PENNSYLVANIA
From 31-JAN-13 01:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 49.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in PHILADELPHIA, PENNSYLVANIA
From 31-JAN-13 01:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 46.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong Wind in UPPER BUCKS, PENNSYLVANIA
From 31-JAN-13 01:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 43.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in LOWER BUCKS, PENNSYLVANIA
From 31-JAN-13 01:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in WESTERN CHESTER, PENNSYLVANIA
From 31-JAN-13 01:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 47.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: AWOS

Strong Wind in EASTERN MONTGOMERY, PENNSYLVANIA
From 31-JAN-13 01:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 43.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in WESTERN MONTGOMERY, PENNSYLVANIA
From 31-JAN-13 01:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in EASTERN CHESTER, PENNSYLVANIA
From 31-JAN-13 01:00:00 to 31-JAN-13 03:00:00 (EST-5)
Magnitude: 50.00 MG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in CARBON, PENNSYLVANIA
From 31-JAN-13 02:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 42.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in MONROE, PENNSYLVANIA
From 31-JAN-13 02:00:00 to 31-JAN-13 16:00:00 (EST-5)
Magnitude: 46.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: ASOS