An atmospheric river brought heavy rain and mountain snow to parts of California and the Pacific Northwest on Friday, January 31.Satellite imagery released by the Cooperative Institute for Research in the Atmosphere at Colorado State University shows the atmospheric river event moving into the region.A flood watch was in effect for parts of Northern California on Friday, while winter storm warnings and advisories were in place for parts of the northwestern United States.The National Weather Service said the rain and mountain snow is expected to continue into next week. Credit: CSU/CIRA & NOAA via Storyful