Dense fog advisory active for North Bay Interior Valleys and Southern Monterey Bay and Big Sur Coast

Dense Fog Advisory Issued for North Bay Interior Valleys, Southern Monterey Bay, and Big Sur Coast

The National Weather Service (NWS) released a dense fog advisory on Saturday at 6:14 a.m. for the North Bay Interior Valleys, Southern Monterey Bay, and Big Sur Coast. This advisory is in effect until 10 a.m.

Visibility and Driving Conditions

The NWS San Francisco office warns of visibility reduced to half a mile or less in dense fog. Such low visibility can create hazardous driving conditions.

“Visibility one half mile or less in dense fog.”
“Low visibility could make driving conditions hazardous.”

Safety Recommendations

“Widespread dense fog will have the potential to reduce visibility to below one-quarter of a mile.”
“If possible, consider avoiding travel across the region.”
“If you must travel, allow extra drive time to reach your destination safely.”

Advisory Explanation

A dense fog advisory means widespread dense fog has developed, lowering visibility to a quarter-mile or less. These visibility conditions demand caution while traveling or suggest postponing trips if feasible.

Driving Tips in Fog

Author's summary: A dense fog advisory until 10 a.m. warns of severely reduced visibility in parts of Northern California, urging drivers to slow down and consider delaying travel for safety.

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The Mercury News The Mercury News — 2025-11-01