Mar 10, 2012; 10:14 AM ET
A new series of storms moving into the Northwest beginning this weekend will bring rain, colder air and lowering snow levels.
While none of the storms appear to be powerhouses in terms of widespread damaging winds, they will bring substantial precipitation as a cumulative effect over time.
Snow levels may dip as low as 500 feet around Seattle and to near 1,000 feet around Portland, Ore., later this weekend. This will allow some wet snow to mix in on the hills, while rain falls at sea level.
As the atmospheric parade continues, the rain and mountain snow will push inland and southward over the West into next week.
In the Cascades, a foot or more of snow will fall with several inches of snow in store for the passes, including over I-90. Snow will also push into the northern Rockies this weekend, before penciling out east of the Divide.
As each storm pushes ashore, a shift in the jet stream will allow the storms to drive more to the south into more of California and Nevada.
It is possible that during next week substantial snow will fall across much of the Sierra Nevada. Drenching rain could also spread southward along coastal areas and interior valley areas of California during this time.
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