A pattern change is taking shape over the Pacific Northwest that will bring an atmospheric river with soaking rain and mountain snow to Washington and Oregon, and a little rain to parts of fire-plagued northern California through the weekend.
Right on cue as we progress deeper into fall, the Pacific jet stream is beginning to send storm systems into the Pacific Northwest.
A pair of Pacific storms will push into the Northwest through the weekend, one of which will tap what is known as an atmospheric river.
An atmospheric river is a thin and long plume of moisture that stretches from the tropics or subtropics into higher latitudes—in this weekend's case, from the western Pacific Ocean to the northwestern United States.
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