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🟡 Moderate
Dense Fog Advisory
East Bay Interior Valleys
Dense Fog Advisory issued December 17 at 8:35PM PST until December 18 at 7:00AM PST by NWS San Francisco CA
Alert Description
* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...East Bay Interior Valleys. * WHEN...Until 7 AM PST Thursday. * IMPACTS...Low visibility could make driving conditions hazardous.
Safety Instructions
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Time Information
Effective
Dec 18, 2025, 4:35 AM
Expires
Dec 18, 2025, 3:00 PM
Issued
Dec 18, 2025, 4:35 AM
Alert Details
Severity
Moderate
Urgency
Expected
Certainty
Likely
Category
Met
Issued By
NWS San Francisco CA
National Weather Service