Our Own Kind of Fog

A narrow finger of fog in San Francisco Bay

Taken one July morning from a bus window when traveling over the San Francisco Bay Bridge, this photo shows a narrow finger of fog over the bay. Fog often comes pouring in from the Golden Gate, which is obscured here by the fog. When the marine influence over the Bay Area's climate is weak (also known as a "shallow marine layer), the fog is pressed close to the surface and has trouble moving across the bay to Berkeley and Emeryville.

You can just barely see Alcatraz Island in this photo; it's also obscured by the fog.