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Portland’s Heavy Rain Was Caused by an “Atmospheric River” That Led to Flooding and Landslides Across the State Despite the floods and sewage spill, this instance of the weather phenomenon wasn’t too bad. Waiting. (Alex Wittwer) Updated December 21, 2020 If it felt like a river just descended on Portland, you re totally right. For the past few days, most of Western Oregon and Washington have seen a downpour of rain caused by an atmospheric river.