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 and Southern Monterey Bay

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

Visibility and Safety Concerns

The NWS warns that visibility could drop to one half mile or less in dense fog, creating hazardous driving conditions. Drivers are advised to:

“Low visibility could make driving conditions hazardous,” said the NWS San Francisco office.

Hazardous Driving and Travel Advice

Widespread dense fog may reduce visibility below one-quarter of a mile. The NWS recommends considering avoiding travel in these areas if possible. If travel is necessary, allow extra time and take appropriate precautions to ensure safety.

“Use your low beam headlights, slow down, and be prepared for periods of hazardous driving conditions due to poor visibility. If possible, consider avoiding travel across the region. If you must travel, allow extra drive time to reach your destination safely.”

What a Dense Fog Advisory Means

A dense fog advisory indicates widespread dense fog has developed, causing visibility to fall to a quarter-mile or less. These conditions significantly increase travel risks, urging drivers to exercise caution or postpone trips when feasible.

Driving Tips in Dense Fog

Adhering to these tips helps ensure safer travel under foggy conditions.

Summary: The National Weather Service has issued a dense fog advisory for parts of Northern California until 10 a.m., urging caution due to reduced visibility and advising drivers to slow down, use low beam headlights, and allow extra travel time.

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

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