Officials ahead of the storm's arrival distributed sandbags, prepositioned rescue swimmers and told residents to have their go-bags ready.

Snow and ice in whiteout conditions contributed to a pileup of more than 100 cars on a major highway connecting Oregon and Idaho, reportedly injuring several people, as a winter storm descended on the Pacific Northwest Thursday.

Evacuation orders and warnings were issued in areas where hillsides were burned bare by the Palisades Fire, which was the most destructive in LA history, over concerns about potential debris flows during thunderstorms.