Weather Alerts For Lafayette, CA

URGENT - WEATHER MESSAGE National Weather Service San Francisco CA 901 PM PST Sat Dec 13 2025 North Bay Interior Valleys-East Bay Interior Valleys- 901 PM PST Sat Dec 13 2025 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM PST SUNDAY... * 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 Sunday. * 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. &&