A mass of cold air sliding down from Siberia and the Gulf of Alaska prompted a freeze warning for parts of the Bay Area on Tuesday night, leading officials in the South Bay to begin opening warming shelters to house people living alongside creek beds.
Overnight temperatures could approach record lows in parts of the Bay Area on Tuesday night, with forecasts calling for temperatures to dip into the 30s for parts of the Peninsula and the East Bay and below freezing in the South Bay, according to the National Weather Service. Oakland could tie its record low temperature of 38 degrees on Tuesday night, while San Francisco is