A friend from the Bay Area sent a link from NPR containing this video. I found the second half particularly engaging, as the fog laps up against the hills like the ocean against the shore. Here's an excerpt from the link:
Simon Christen lives in Oakland and has been pointing his camera across the bay at San Francisco for the past year, taking time-lapse photos of the city. "About halfway through the project, the fog became the main subject," he writes in an e-mail, "and I tried to find locations to highlight it."