A shallow marine layer brought 3 periods of dense fog the the Southwest California coast from the evening of February 2nd through morning hours on February 5th.

Dense Fog in ORANGE COUNTY COASTAL AREAS, CALIFORNIA
From 03-FEB-15 01:00:00 to 03-FEB-15 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Fullerton Municipal Airport ASOS reported two periods of fog with 1/4 mi visibility  on February 3rd, with the first period being between 0102 to 0437PST and second period occurring from 0553 to 0800PST.

Dense Fog in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 03-FEB-15 22:30:00 to 04-FEB-15 08:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Brown Field Municipal Airport ASOS reported a 1/4 mi visibility from 2253PST on the 3rd to 0807PST on the 4th. Periods of 1/4 mi visibility were also reported between 0200 and 0830PST on the 4th at the Oceanside Municipal Airport, MSAS Miramar Airport, Montgomery Field, and McClellan-Palomar Airport ASOS stations.

Dense Fog in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 04-FEB-15 02:00:00 to 04-FEB-15 08:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS station at the Gillespie Field Airport in El Cajon reported 1/4 mi visibility from 0155 to 0815PST of February 4th.

Dense Fog in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 04-FEB-15 22:30:00 to 05-FEB-15 09:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The MCAS Miramar Airport ASOS reported visibility at or below than 1/4 mi between 2255 PST on the 4th and 0820 PST on the 5th. The Montgomery Field ASOS reported visibility at or below that 1/4 mi between 2301 PST on the 4th and 0853 PST on the 5th. Periods of fog with 1/4 mi or less visibility were also reported between 0000 and 0800 PST on the 5th at the McClellan-Palomar Airport, Camp Pendleton MCAS Airport,  MCOLF Camp Pendleton (Red Beach) Airport, Oceanside Airport, Lindbergh Field, and Brown Field ASOS stations.

Dense Fog in ORANGE COUNTY INLAND, CALIFORNIA
From 05-FEB-15 04:00:00 to 05-FEB-15 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A brief period of 1/4 mi visibility occurred at the Fullerton Airport ASOS between 0425 and 0453PST.

Dense Fog in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 02-FEB-15 20:30:00 to 03-FEB-15 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

From 2030PST on the 2nd to 0600PST on the 3rd, periods of dense fog with visibility below 1/4 mi occurred at the MCAS Miramar Airport ASOS, McClellan-Palomar Airport ASOS, and Brown Field Municipal Airport ASOS. Visibilities below 1/4 mi also occurred at the MCOLF Camp Pendleton ASOS between 0500 and 0700PST on the 3rd, and at the Montgomery Field ASOS between 0100 and 0430PST on the 3rd. USBP Imperial Beach activated their Fog Cutter staffing program due to impact.

Dense Fog in ORANGE COUNTY COASTAL, CALIFORNIA
From 05-FEB-15 03:00:00 to 05-FEB-15 09:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS station at John Wayne Airport reported visibility at or below 1/4 mi between 0304 and 0925PST on February 5th.