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

Dense Fog Advisory for North Bay and Southern Monterey Areas

The National Weather Service issued a dense fog advisory early Saturday at 6:14 a.m., affecting the North Bay Interior Valleys, Southern Monterey Bay, and the Big Sur Coast. The advisory remains in effect until 10 a.m.

Visibility and Safety Concerns

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

According to the NWS San Francisco office, widespread fog may reduce visibility to below one-quarter of a mile. Such conditions can make travel dangerous, particularly in low-lying or coastal regions.

Travel Recommendations

Understanding a Dense Fog Advisory

When such an advisory is in effect, it means widespread fog has formed, and visibility may drop sharply to a quarter-mile or less. Drivers are urged to remain alert, follow posted warnings, and prioritize safety over speed.

Author’s Summary: Early Saturday, dense fog affected North Bay and Monterey regions, prompting safety warnings from the National Weather Service due to sharply reduced visibility and hazardous driving conditions.

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