More Rain in Store for the Northwest Coast

By Courtney Spamer, Meteorologist
November 17, 2012; 1:04 AM ET
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The wet weather will continue to be the norm in the Pacific Northwest throughout the weekend and into next week.

An area of low pressure located in the eastern Pacific Ocean off the central British Columbia coast early Saturday morning was strengthening as it slowly tracked toward the east.

The cold front associated with the storm extend southeast from the storm, bringing the start of what will be a stretch of rainy days for the Pacific Northwest.

As this low becomes stronger, it will produce waves of showers along the counterclockwise rotation of the storm. These waves will move lines of showers from west to east and into the Northwest coast for the next several days.

The first of these heavy bands is expected along the Washington and Oregon coasts Saturday. With continual showers until Sunday, another wave of energy with heavier rain is expected Sunday evening into Monday.

More heavy rain will push into the coast Monday. By this time, the low pressure will move, but it will only move slightly southward.

Mountainous region will have cool enough temperatures to produce heavy snow. This includes the higher elevations of the Cascades from Canada into Oregon and northern Rockies in Idaho, Montana and British Columbia.

At this time, it appears rain will continue to slam into the West Coast from northern California to southern Canada through the end of next week, impacting travel around the Thanksgiving Holiday.

Many locations in western Washington and Oregon have already seen measurable precipitation for most of this month. In fact, the last completely dry day in Seattle was Oct. 25.

For November, Seattle is actually below its average amount of precipitation, receiving only 60 percent of the normal. But the month of October was very wet for the Emerald City, seeing 6.71 inches of rain, 193 percent of the average.

With the amount of rain expected over the next week, Seattle could again be over the month's average precipitation.

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