Dense Fog Advisory issued September 29 at 8:34PM PDT until September 30 at 10:00AM PDT by NWS

...Patchy dense fog to expand overnight on the coast... .Patchy dense fog will become more widespread through the night hours. The fog will significantly reduce visibilities on the immediate coast along Intestate 5 in southern Orange and San Diego Counties. ...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM PDT SATURDAY...

from Current Watches, Warnings and Advisories for the United States Issued by the National Weather Service http://ift.tt/2fzSNFg