The National Weather Service issued a dense fog advisory at 12:27 a.m. on Thursday in effect until 10 a.m. for North Bay Interior Valleys.

The NWS San Francisco CA says to expect, “Visibility one quarter mile or less in dense fog.”

“Low visibility could make driving conditions hazardous. Limited visibility will result in hazardous driving conditions,” the NWS said. “If driving, slow down, use your headlights, and leave plenty of distance ahead of you. If commuting, allow extra drive time to reach your destination safely.”

Fog safety: Tips from the NWS for safe travels

When a dense fog advisory is issued for your area, it means that widespread dense fog has developed and visibility can plummet to a quarter-mile or less. These conditions pose challenges for travel, so exercise extra caut

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