* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Del Norte and Northern Humboldt Coast. Strongest within 1 mile of shore along the Highway 101 corridor.
* WHEN...Until 8 AM PDT Friday.
* IMPACTS...Low visibility could make driving conditions hazardous. Allow extra time to reach your destination.
* ADDITIONAL DETAILS...Fog will become more dense through the night.