Northern California sees historic deluge as atmospheric river slams state

San Francisco posted its second-wettest day in more than 170 years because of this fire hose of tropical moisture. All told on Saturday, downtown San Francisco registered 5.46 inches of rain, marking its second-wettest day in records dating to 1849. On Buena Vista Avenue in East San Francisco, a tree came crashing down onto parked cars, halting the progress of a nearby bus. In San Ramon, east of San Francisco, the fire department tweeted that it responded to more than 100 flood- and storm-related incidents. © Dav Yaginuma via REUTERS A road is flooded after heavy rains in San Francisco on Saturday.