SAN FRANCISCO – MAY 7: Alcatraz Island sits in the background as people play on the beach at Crissy Field May 7, 2007 in San Francisco, California. The Bay Area is experiencing a heat wave with temperatures expected to surpass 90 degrees today in San Francisco. A cooling trend is expected to come into the region after Tuesday. (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO – MAY 7: Alcatraz Island sits in the background as people play on the beach at Crissy Field May 7, 2007 in San Francisco, California. The Bay Area is experiencing a heat wave with temperatures expected to surpass 90 degrees today in San Francisco. A cooling trend is expected to come into the region after Tuesday. (Photo by Justin Sullivan/Getty Images)
