Amazing Photo Shows SF Fog From Space

http://www.huffingtonpost.com/2012/09/18/san-francisco-from-space-_n_1892071.html

A NASA satellite recently captured an image of the Fog City from above, showing a stark contrast between the blanket of water vapor that hovers over much of San Francisco while leaving Marin County, the East Bay and the southeast neighborhoods perfectly clear.

NASA explains the science behind the phenomenon:

Intrusions by the marine layer—and all of the accompanying fog and clouds—are routine in San Francisco during the summer. The intrusions are caused by westerly breezes that push cold air inland to replace the warm air rising off of California’s Central Valley. As it did on the day this image was taken, the marine layer often completely envelops the Golden Gate Bridge in a thick cloak of fog and clouds.