Bay Area Halloween forecast: Coastal flooding, showers possible for trick-or-treating

Low-lying parts of the Bay Area could continue to see tidal flooding on Halloween, while showers could move into the region just in time for trick-or-treating Saturday night, forecasters said.More coastal flooding possible"A combination of high astronomical tides and surge from thermal expansion and low pressure effects brings the risk of minor coastal flooding along the Bayshore at the San Pablo, San Francisco, and Monterey Bays, and the Pacific coast, at high tide today," the National Weather Service said in its Friday morning forecast discussion.At the San Francisco tidal gauge, Friday's high tide at 2:39 p.m. is expected to be 1.9 feet above normal.The weather service has again extended a coastal flood advisory for shoreline locations along the coast, San Francisco Bay, San Pablo Bay and Monterey Bay through 6 p.m. on Sunday. Forecasters said that up to 1.9 feet of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. Coastal Fl