Following the bomb cyclone, the region faces days of rain, flooding and snow at higher elevations, the National Weather Service said Wednesday. That's part of an atmospheric river that could bring over a foot of rain to some areas.

A powerful atmospheric river is slamming into Northern California and is expected to persist for days. Its effects, coupled with a bomb cyclone offshore, are being felt across the Pacific Northwest.

A major storm was sweeping across the northwest U.S., battering the region with strong winds and rain and causing widespread power outages.