The storm, driven by the season’s first major atmospheric river, inundated the region, killing at least two people and causing widespread power outages.

One of the strongest storms on the West Coast in decades knocked out power for thousands of people, unleashed strong winds that toppled trees and left two dead in Washington before making its way through Oregon to Northern California where on Thursday it dropped heavy snow and record amounts of rain.

The National Weather Service has extended a flood watch for areas north of San Francisco as a plume of moisture known as an atmospheric river inundates Northern California and the Pacific Northwest.