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Northwest, N. Calif., Enduring More Rain and Snow

UPDATED 4:30 PM PST, December 4, 2012

UPDATED By WeatherBug Meteorologist, Seth Carrier

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Yet another Pacific storm is bringing more flooding rain, gusty to damaging winds and heavy mountain snow to the western U.S. Fortunately, the storm won`t be as powerful as last weekend`s storm and will likely loosen its grip later Wednesday.

Rain is drenching the Interstate 5 corridor across Washington, western Oregon and northern California. Inland, cooler air is causing the moisture to be squeezed out as snow in the northern Cascades and northern Rockies.

An additional 1 to 3 inches of rain will soak the already waterlogged Coastal Range and Cascades. This will be enough to cause more flooding in coastal areas of Washington and in Oregon`s Willamette Valley. Flood Watches are in place for western Oregon, southwestern Washington and far northern California, including Medford and Portland, Ore.

The rain will add to the growing surplus for the year in Portland, Ore. Since October 1, rain has been 6 inches above average and for the year more than a foot above average. The same can be said in Seattle where rainfall is up almost 10 inches above average for 2012.

The weather is a different story above 3,000 feet in the Cascades. All the Pacific moisture will turn into snow with snow levels lowering to 2,500 feet tonight. Six inches to a foot will fall in the northern Cascades and Sawtooth Mountains. Farther to the east, 15 to 20 inches will blast Wyoming`s Tetons.

Winter Weather Advisories have been posted for Washington`s Cascades as well as the Sawtooth Mountains in Idaho. Winter Storm Warnings are in place across Wyoming`s Tetons in advance of the snow.

Due to the heavy, wet nature of the snow, power outages and difficult driving can be expected along Interstate 90 through Snoqualmie Pass.

Rain will be driven by gusty southerly winds that could reach 50-60 mph in southern Oregon. These winds will cause difficult travel along Interstate 5 and across the southern Cascades. Here, Wind Advisories are in place.

This storm will exit the area Wednesday with another moisture wave poised to slide in from the North Pacific on Thursday. This one looks to primarily impact the Northwest Coast and steer clear of northern California.

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