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An incoming atmospheric river is set to bring rainfall across western Washington this week. Here's a timeline of this week's weather.

What are these atmospheric rivers that bring heavy rain and snow to California? Paul Duginski © (NOAA and Los Angeles Times) A satellite photo taken just before 2 p.m. Pacific time on Thursday shows a huge vapor plume stretching from the central Pacific to the California coast. (NOAA and Los Angeles Times) An atmospheric river — a plume of moisture that has been likened to a river in the sky — has brought heavy precipitation to the Central Coast. Now it will sag southward and bring rain and mountain snow to Southern California on Thursday night into Friday morning, the ...

A winter storm swept over much of Southern California, dusting mountaintops with snow and bringing traffic to a standstill on several passes. The front and the moisture plume associated with it will be weaker and will be accompanied by strong south to southeast winds when they arrive in the Los Angeles region. Advertisement What are atmospheric rivers? Atmospheric rivers are concentrated streams of water vapor in the middle and lower levels of the atmosphere. They’re like a continuous channel of moisture streaming across the ocean without interruption until they encounter an obstacle such ...