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Updated:December 5, 2025 12:02 am PST

Dense Fog Advisory DENSE FOG ADVISORY  
Shasta County
Effective: Thu, 12/4 10:12pm Severity:  Moderate 
Updated: December 5, 2025 12:02 am Urgency: Expected
Expires: Fri, 12/5 11:00am Certainty: Likely
Areas Affected: Northern Sacramento Valley - Central Sacramento Valley - Southern Sacramento Valley - Carquinez Strait and Delta - Northern San Joaquin Valley
 
Alert Details: 
* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Carquinez Strait and Delta, Sacramento Valley, and
Northern San Joaquin Valley.

* WHEN...Until 11 AM PST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous.

* ADDITIONAL DETAILS...Find the latest road conditions at
quickmap.dot.ca.gov

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