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.

The storm arrived in the Pacific Northwest earlier this week, killing two people and knocking out power to hundreds of thousands, mostly in the Seattle area, before moving through Northern California.

The Weather Prediction Center has placed portions of northern California under a rare Level 4 of 4 risk of flooding Thursday.