New Storm Takes Aim at Seattle, Cascades

By Andy Mussoline, AccuWeather.com Senior Meteorologist
December 4, 2012; 4:20 AM ET
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Play video Northwest regional weather is detailed in the above AccuWeather.com video.

A new storm is taking shape across the Pacific Ocean and will spread another round of heavy rain and gusty winds into the Northwest Monday night into Tuesday.

After a powerhouse storm slammed into Oregon earlier this weekend and spread heavy rain and damaging winds south into California, another storm is poised to hit the Northwest once again.

Intermittent rain and mountain snow will persist across western Oregon and Washington through Monday even though the newest storm has yet to arrive.

Snow levels will hold nearly steady between 3,000 and 3,500 feet in the Washington Cascades through Monday. This can bring an additional 6-12 inches of snow Monday evening. In turn, travel through the passes in Washington can be slick with snow- and ice-covered roads. Farther south into Oregon, most major passes should be just wet, with snow levels a moving toward 5,000 and 6,000 feet by Monday.

West of the Cascades, including the major cities of Seattle and Portland, on-and-off rain will continue into Monday. However, the rain will prove more of a nuisance than anything.

A stubborn storm centered just west of northern British Columbia is responsible for rainy and snowy weather across the Northwest through Monday.

However, the new storm taking aim at the region is originating just north of Hawaii. The new storm move full-steam across the Pacific before slamming into the region Monday night into Tuesday.

Rounds of rain, some heavy, will hit the region Monday night into Tuesday. Areas from northern California to Washington will feel the brunt of the storm, especially the mountainous areas.

Already saturated ground, in combination with the new waves of rain, can cause mudslides in the region. Gusty winds can bring down trees and power lines as well, sparking power outages in the region.

Heavy rain and gusty winds will be the focus with this new storm. Snow levels will rise well above the passes in the Cascades Monday night into Tuesday as a surge of warmer air accompanies the storm.

The storm will dissipate inland by Wednesday, leading to quieter weather in the Pacific Northwest. However, some lingering showers will once again persist.

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