Dense Fog Advisory issued January 21 at 2:13AM PST until January 21 at 9:00AM PST by NWS San Diego CA

* WHAT…Visibility one quarter mile or less in dense fog.

* WHERE…Western portions of the Inland Empire.

* WHEN…Until 9 AM PST this morning.

* IMPACTS…Low visibility could make driving conditions hazardous.
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.