A sallow marine layer lingered along the coast between the 12th and 16th of March, resulting in night and morning dense fog along the coast of Orange and San Diego Counties.

Dense Fog in ORANGE COUNTY COASTAL, CALIFORNIA
From 12-MAR-17 06:20:00 to 12-MAR-17 07:25:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

John Wayne Airport reported dense fog with a visibility of 1/4 mile.

Dense Fog in ORANGE COUNTY INLAND, CALIFORNIA
From 12-MAR-17 06:28:00 to 12-MAR-17 07:08:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Los Alamitos Army Airfield reported a brief period of dense fog with a visibility of 1/4 mile.

Dense Fog in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 11-MAR-17 23:45:00 to 12-MAR-17 08:45:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense fog developed along the coast late on the 11th and pushed inland overnight. Carlsbad, McClellan-Palomar Airport reported 9 hours of dense fog with a visibility of 1/4 mile or less. Other airports up and down the coast also experienced visibility of 1/4 or less during this period, though San Diego International never dropped below 1/4 mile.

Dense Fog in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 12-MAR-17 06:10:00 to 12-MAR-17 06:50:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense fog briefly pushed into the western San Diego County Valleys, Gillespie Field Airport reported 1/4 mile or less visibility for about an hour.

Dense Fog in ORANGE COUNTY COASTAL, CALIFORNIA
From 13-MAR-17 05:00:00 to 13-MAR-17 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Lifeguard

Newport Beach lifeguards reported dense fog with a visibility of 200 ft.

Dense Fog in ORANGE COUNTY COASTAL, CALIFORNIA
From 14-MAR-17 01:35:00 to 14-MAR-17 07:57:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

John Wayne Airport reported reported dense fog with a visibility of 1/4 mile or less for more than 6 hours.

Dense Fog in ORANGE COUNTY INLAND, CALIFORNIA
From 13-MAR-17 22:48:00 to 14-MAR-17 08:15:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Los Alamitos Army Airfield reported periods of dense fog with a visibility of 1/4 mile or over a 9 hour period.

Dense Fog in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 13-MAR-17 18:30:00 to 14-MAR-17 05:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Areas of dense fog were reported by multiple ASOS/AWOS stations over a 11 hour period. No significant impacts were reported at San Diego International, though the visibility did drop to 1/4 mile for several hours.

Dense Fog in ORANGE COUNTY INLAND, CALIFORNIA
From 16-MAR-17 05:00:00 to 16-MAR-17 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Lifeguard

Newport Beach Lifeguards reported dense fog with a visibility of 200 ft.

Dense Fog in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 16-MAR-17 01:30:00 to 16-MAR-17 08:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Numerous ASOS and AWOS stations along the San Diego County coast reported visibility of 1/4 mile or less over a 7 hour period. No impacts were reported at San Diego International.

Dense Fog in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 12-MAR-17 20:00:00 to 13-MAR-17 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Areas of dense fog were reported along the coast of San Diego County over a period of 12 hours at multiple ASOS/AWOS sites. Impacts were minimal at San Diego International where visibility only fell to 1/4 mile between 0615 and 0651PST.

Dense Fog in ORANGE COUNTY COASTAL, CALIFORNIA
From 15-MAR-17 05:45:00 to 15-MAR-17 07:50:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

John Wayne Airport reported 2 hours dense fog with a visibility of 1/4 mile or less. Newport Beach Lifeguards also reported a visibility of 200 ft at 0600PST.