One product issued by NWS for:
Dense Fog Advisory
URGENT - WEATHER MESSAGE National Weather Service San Diego CA 213 AM PST Wed Jan 21 2026 CAZ043-050-552-554-211700- /O.CON.KSGX.FG.Y.0001.000000T0000Z-260121T1700Z/ San Diego County Coastal Areas-San Diego County Valleys-Orange County Coastal Areas-Orange County Inland Areas- Including the cities of Escondido, El Cajon, San Marcos, Fullerton, Mission Viejo, Vista, Anaheim, Orange, Poway, Santee, and La Mesa 213 AM PST Wed Jan 21 2026 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Near high coastal terrain and inland areas in Orange County, near higher coastal terrain into the western valleys in San Diego County. * WHEN...Until 9 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. && $$ 17