High pressure across most of the Northeast and Mid Atlantic led to the development of dense fog across the region.  Light winds and saturated low levels aided in fog development.

Dense Fog in ANNE ARUNDEL, MARYLAND
From 10-DEC-12 00:12:00 to 10-DEC-12 11:10:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility was reported to be around one quarter mile at Baltimore Washington and Fort Meade airports.

Dense Fog in ST. MARY'S, MARYLAND
From 09-DEC-12 19:19:00 to 10-DEC-12 10:20:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility was reported to be around one quarter mile at St Marys and Patuxent River NAS.

Dense Fog in CALVERT, MARYLAND
From 09-DEC-12 21:00:00 to 10-DEC-12 10:20:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility was reported to be around one quarter mile at St Mary's airport and Patuxent River NAS.

Dense Fog in WASHINGTON, MARYLAND
From 10-DEC-12 04:06:00 to 10-DEC-12 10:53:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility was reported to be around one quarter mile at Hagerstown airport.

Dense Fog in FREDERICK, MARYLAND
From 10-DEC-12 06:53:00 to 10-DEC-12 09:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility was reported to be around one quarter mile at Frederick airport.

Dense Fog in MONTGOMERY, MARYLAND
From 10-DEC-12 00:55:00 to 10-DEC-12 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility was reported to be around one quarter mile at Gaithersburg airport.

Dense Fog in SOUTHERN BALTIMORE, MARYLAND
From 10-DEC-12 02:18:00 to 10-DEC-12 13:55:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility was reported to be around one quarter mile at Martins State Airport.

Dense Fog in PRINCE GEORGES, MARYLAND
From 09-DEC-12 22:39:00 to 10-DEC-12 07:52:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility was reported to be around one quarter mile at Andrews Air Force Base.

Dense Fog in CENTRAL AND EASTERN ALLEGANY, MARYLAND
From 10-DEC-12 02:18:00 to 10-DEC-12 09:02:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility was reported to be around one quarter mile at Cumberland Airport.

Dense Fog in HOWARD, MARYLAND
From 10-DEC-12 00:55:00 to 10-DEC-12 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility was reported to be around one quarter mile at Gaithersburg and Baltimore Washington Airports.

Dense Fog in NORTHERN BALTIMORE, MARYLAND
From 10-DEC-12 03:53:00 to 10-DEC-12 08:53:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility was reported to be around one quarter mile at York Airport.

Dense Fog in CARROLL, MARYLAND
From 10-DEC-12 03:53:00 to 10-DEC-12 08:53:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility was reported to be around one quarter mile at Frederick and York Airports.

Dense Fog in HARFORD, MARYLAND
From 10-DEC-12 02:18:00 to 10-DEC-12 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility was reported to be around one quarter mile at Martins State and Aberdeen Airports.

Dense Fog in CHARLES, MARYLAND
From 09-DEC-12 22:56:00 to 10-DEC-12 13:09:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility was reported to be around one quarter mile at Quantico and St Marys Airports.