Several waves of low pressure are lined up to move onshore across the Northwest through the weekend and the upcoming work week. Following a smaller and quickly moving storm system, the next trough is expected to bring widespread rain and snow to the Northwest and as far south as Central California.

Several winter alerts have been issued ahead of the first wave in the series, expected to move onshore Saturday night into Sunday.

A winter storm watch has been issued for the Hood River area along I-84 for moderate snow and accumulating ice. Winter weather advisories (below) have been issued for other sections of I-84 from Eastern Oregon into Southern Idaho for moderate to heavy snow.

Winter Storm Warnings and Winter Weather Advisories have been issued around the Northern Sierra across California and Nevada for heavy snow. 4-12 inches are expected for elevations above 4000 feet, with isolated totals as high as 17 inches.

Forecast

Here’s the latest look at the timing and placement of the rain and snow from early Sunday through Tuesday when the next system moves onshore.

Snow totals could top 6 inches for many mountain regions, with over a foot in the Cascades with higher elevations potentially seeing as much as two feet. Lower elevations are generally expected lighter amounts, up to several inches. Lower elevations west of the Cascades and Sierra could record over an inch or two of rain.

This article will be updated as new weather alerts are issued and new data becomes available.