A historically strong bomb cyclone, which triggered winds that killed at least two people, is working with a powerful atmospheric river to bring heavy rain, potential flooding, gusty winds and mountain snow across Northern California and the Pacific Northwest – and another storm is on the way.

A major storm moving through Northern California on Thursday toppled trees and dropped heavy snow and record amounts of rain after damaging homes, killing two people and knocking out power to hundreds of thousands of customers in the Pacific Northwest.