Dense Fog Advisory
This alert has expired. For current weather alerts, visit the Weather Alerts Map.
Status
Event Continued ExpiredStart Time
Sat 12/13/2025 07:31 AM ESTEnd Time
Sat 12/13/2025 02:00 PM ESTSignificance
AdvisoryImpacts
Low impact
Locations Affected
Santa Rosa, CA ∙ Concord, CA ∙ Antioch, CA ∙ Livermore, CA ∙ Napa, CA ∙ San Ramon, CA ∙ Pleasanton, CA ∙ Pittsburg, CA ∙ Walnut Creek, CA ∙ Petaluma, CAFull Alert Message
URGENT - WEATHER MESSAGE National Weather Service San Francisco CA 431 AM PST Sat Dec 13 2025 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 11 AM PST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...East Bay Interior Valleys and North Bay Interior Valleys. * WHEN...Until 11 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Technical Header
CAZ506-510-131900- /O.CON.KMTR.FG.Y.0034.000000T0000Z-251213T1900Z/ North Bay Interior Valleys-East Bay Interior Valleys- 431 AM PST Sat Dec 13 2025
