748 AM PST Wed Dec 27 2017 San Francisco-North Bay Interior Valleys- San Francisco Bay Shoreline- Including the cities of San Francisco, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Oakland, Fremont, Hayward, Daly City, and Berkeley 748 AM PST Wed Dec 27 2017 .Now... Patchy dense fog is currently being reported in the North Bay Valleys and near San Francisco Bay. As of 7:45 AM PST the visibility was one-quarter mile at the Santa Rosa and Napa Airports and only one-eighth of a mile at the San Francisco Airport. Patchy dense fog will continue in these areas for the next hour or two. Anyone traveling in these areas should allow for extra travel time this morning.