Pacific Storm Parade to Lash Northwest With Heavy Rain, Mountain Snow Through This Weekend
A parade of Pacific storms that began last week will continue to impact the Northwest into the coming weekend.
This additional heavy rainfall will, and already has, triggered localized urban flooding and will push rivers above flood stage in parts of western Washington and western Oregon. Since the beginning of this wet weather pattern nearly a foot of rain has fallen in at least one location near Washington's Olympic Mountains. Feet of snow will also pile up in the Cascades, and other mountain chains from this Pacific onslaught.
Record rainfall has already brought flooding to the Portland, Oregon area to start the work week and the risk of flooding will continue into Thursday.
A classic November-December setup featuring a powerful jet stream stretching from eastern Asia across the Pacific for 5,000 miles to the Pacific Northwest is acting as the conductor for this storm parade. The persistent pipeline of moisture is being supplied by what meteorologists sometimes refer to as an atmospheric river. In this case, the plume of moisture impacting the Northwest extends all the way into the western Pacific Ocean near the Philippines. See below for more details on atmospheric river events along the West Coast.
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