Officials are warning San Francisco residents of dangerous flooding as a powerful atmospheric river propelled by a churning bomb cyclone moves through the region.

SAN FRANCISCO - An atmospheric river is bringing heavy rain to San Francisco on Friday, flooding roads across the city. Video shows rising waters in the Marina District and flooded sidewalks along 23rd and Dolores streets. Another video shows cars driving through flooded streets at Henry Adams and Division in the Design District near I-80.

A third day of an atmospheric river storm has inundated Northern California and the Bay Area, with the storm spreading from the North Bay south across the region, flooding creeks, roads, and low-lying areas.

An atmospheric river continued to drench the Bay Area on Friday, triggering flash flood warnings due to the intense rainfall. Follow along for live updates.

The Bay Area and Northern California awoke Wednesday to the arrival of a storm fueled by a strong atmospheric river and intensified by a so-called "bomb cyclone" off the Pacific Northwest coast.

A powerful atmospheric river storm that drenched the North Bay for two days in a row and set rainfall records moved south Friday, bringing steady rain starting around mid-day that was expected to soak the entire Bay Area until Saturday morning.

The Bay Area prepares for a significant atmospheric river that could bring heavy rainfall and potential flooding mid-week through the weekend.

Flash flood warnings were issued Friday afternoon for several Bay Area counties where instances of flooding deemed "life-threatening" were occurring.

The National Weather Service on Friday issued several flash flood warnings in parts of the Bay Area as heavy rain saturated the region.

San Francisco, San Mateo, Alameda, and Contra Costa counties are under flash flood warnings Friday afternoon as rain continues to fall over the Bay Area.