A woman walks past a mural outside of the City College of San Francisco John Adams campus in San Francisco,Thursday, Feb. 24, 2011. A cold snap is expected by the weekend that could bring sea-level ... more 
A woman walks past a mural outside of the City College of San Francisco John Adams campus in San Francisco,Thursday, Feb. 24, 2011. A cold snap is expected by the weekend that could bring sea-level snow to the bay area. less 
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Associated Press | Photo By Jeff Chiu
Sun, Feb 27, 2011 4:47 PM EST