Wow. Check out this photo Brian Hollinger took yesterday:
Sun setting creates very cool volcano effect with a fog lava flow from Bernal Heights.
Yes!! Super hyper cool.
UPDATE: Brian kindly shared a high-res version of his photo with us, so we can zoom and enhance to bring you this close-up of the Lava Zone:
PHOTO: @brianhollinger
Bernalwood 
The one not-horrible thing about commuting to the South Bay is getting to enjoy a view of fog like that almost every day during the afternoon commute on the 280 (near Crystal Springs Reservoir). I call it “snowbank fog” because it looks like I could ski on it.