North Bay Interior Valleys under a dense fog advisory until Friday morning

Dense Fog Advisory Issued for North Bay Interior Valleys

On Friday, the National Weather Service (NWS) San Francisco, CA, issued a dense fog advisory effective until 10 a.m. for the North Bay Interior Valleys.

Visibility and Driving Conditions

The NWS warns of \"visibility one quarter mile or less in dense fog.\" Such low visibility can create hazardous driving conditions.

"If driving, slow down, use your headlights, and leave plenty of distance ahead of you."

Advisory Details and Safety Tips

The advisory remains in effect until 10 a.m. It is issued when widespread dense fog develops, reducing visibility to a quarter mile or less, making travel difficult.

Extra caution is advised on the roads, and avoiding driving if possible is recommended. For those who must drive, these safety tips are essential.

Safety Recommendations from the NWS

Reduce speed when driving in fog.
Turn on headlights for better visibility.
Maintain a safe distance from vehicles ahead.
Avoid unnecessary travel during dense fog conditions.

Source: The National Weather Service

This story was originally published November 7, 2025, at 1:52 AM.

Author's summary: A dense fog advisory warns of severely limited visibility and dangerous driving conditions in North Bay Interior Valleys until 10 a.m., urging drivers to exercise extreme caution or avoid travel.

The Sacramento Bee — 2025-11-07

Dense Fog Advisory Issued for North Bay Interior Valleys

Visibility and Driving Conditions

Advisory Details and Safety Tips

Safety Recommendations from the NWS

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