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.