A client of mine wanted a fog extent map for the SF Bay Area. I searched and searched, but couldn’t find any vector data, so I created one from sifting through more than 1,600 satellite images taken over the past month, finding the ONE image that showed the furthest extent of fog. SF is pret-ty foggy this time of year, so it was a good series to work with. Then georectified this image, then digitized a polygon, then smoothed the polygon. A simple map showing this file is below, followed by a quick youtube video I compiled with all 1,600 or so images. You can download the source images from the Naval Research Laboratory Monterey Marine Meteorology Division by clicking here.