A high pressure system over Pennsylvania combined with moist conditions at the surface from the rain earlier in the day on the 14th to produce widespread dense fog and even some black ice from the middle of the evening on the 14th through the morning on the 15th. Dense fog persisted longer in Upper Bucks County and the Lehigh Valley, into the afternoon of the 15th  A weak cold front that passed through the area during the early evening of the 15th prevented a second night of widespread dense fog from occurring. Black ice occurred from the far northwest Philadelphia suburbs northwestward through Berks County, the Lehigh Valley and the Poconos. Untreated roadways were hazardous.

Freezing Fog in LEHIGH, PENNSYLVANIA
From 15-JAN-14 03:00:00 to 15-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Freezing Fog in BERKS, PENNSYLVANIA
From 15-JAN-14 01:00:00 to 15-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Freezing Fog in NORTHAMPTON, PENNSYLVANIA
From 15-JAN-14 03:00:00 to 15-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in MONROE, PENNSYLVANIA
From 15-JAN-14 02:00:00 to 15-JAN-14 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in CARBON, PENNSYLVANIA
From 15-JAN-14 02:00:00 to 15-JAN-14 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Freezing Fog in MONROE, PENNSYLVANIA
From 15-JAN-14 02:00:00 to 15-JAN-14 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Freezing Fog in UPPER BUCKS, PENNSYLVANIA
From 15-JAN-14 01:00:00 to 15-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Freezing Fog in CARBON, PENNSYLVANIA
From 15-JAN-14 02:00:00 to 15-JAN-14 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Freezing Fog in WESTERN MONTGOMERY, PENNSYLVANIA
From 15-JAN-14 01:00:00 to 15-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Freezing Fog in WESTERN CHESTER, PENNSYLVANIA
From 15-JAN-14 01:00:00 to 15-JAN-14 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in WESTERN CHESTER, PENNSYLVANIA
From 14-JAN-14 23:00:00 to 15-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in EASTERN CHESTER, PENNSYLVANIA
From 14-JAN-14 23:00:00 to 15-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in EASTERN MONTGOMERY, PENNSYLVANIA
From 15-JAN-14 00:00:00 to 15-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in LOWER BUCKS, PENNSYLVANIA
From 14-JAN-14 22:00:00 to 15-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in DELAWARE, PENNSYLVANIA
From 15-JAN-14 01:00:00 to 15-JAN-14 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in PHILADELPHIA, PENNSYLVANIA
From 15-JAN-14 01:00:00 to 15-JAN-14 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in UPPER BUCKS, PENNSYLVANIA
From 14-JAN-14 22:00:00 to 15-JAN-14 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in LEHIGH, PENNSYLVANIA
From 14-JAN-14 20:00:00 to 15-JAN-14 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in WESTERN MONTGOMERY, PENNSYLVANIA
From 14-JAN-14 21:00:00 to 15-JAN-14 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in NORTHAMPTON, PENNSYLVANIA
From 14-JAN-14 20:00:00 to 15-JAN-14 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in BERKS, PENNSYLVANIA
From 15-JAN-14 01:00:00 to 15-JAN-14 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS