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Pattern shift to give soggy Northwest a chance to dry out

AccuWeather logo AccuWeather 1/13/2021 Mary Gilbert

Following days of drenching rain and mountain snow, a return to a drier pattern is on the horizon for the waterlogged northwestern United States.

A pattern that allowed a long train of storms to pummel the Northwest for over a week will finally begin to break down later Wednesday and allow for an influx of mild, dry air.

The most recent storm to slam into the Northwest began on Monday. Heavy rain drenched costal communities while snow piled up across the Cascades. Even areas farther inland were unable to escape wet weather as the storm pushed eastward into the northern Rockies through Tuesday night. At one point late Tuesday night, nearly 700,000 customers were without power across Washington and Oregon, according to PowerOutage.US.

Olalla, Washington, was the big winner -- or loser, depending on your point of view -- of the most recent storm. As of Tuesday night, close to 8 inches of rain had fallen in the community with a few lingering showers likely to continue for a time on Wednesday.

text © Provided by AccuWeather
Reports as of Tuesday night.

While rain drenched the lower elevations, snow continued to bury the higher elevations across the Northwest. From Monday to Tuesday night, Snoqualmie Pass had recorded just shy of 2 feet of snow, or 23 inches. Several other locations across the Washington Cascades recorded over a foot of snow with the storm, including Stevens Pass. Snow early this week caused many issues for travelers at mountain pass levels and resulted in several road closures.

"The drying trend for the Northwest will begin on Wednesday," AccuWeather Meteorologist Ryan Adamson said.

This storm will track out of the area on Wednesday and shift a majority of the heaviest precipitation north of the border, into Canada. Showery conditions will persist for some across the Northwest on Wednesday, but dry weather is forecast to fully envelop the area by Wednesday night.

"High pressure will build into the northwestern U.S. on Thursday, offering a day free of precipitation for the entire region," AccuWeather Meteorologist Ryan Adamson said.


While sunshine peeks out from behind a few clouds on Thursday, high temperatures will be able to trend to more mild levels. High temperatures in the 50s will be common across coastal areas of Washington and Oregon, with 40s farther inland. Places like Seattle and Portland, Oregon, will experience high temperatures close to 50 on Thursday, 3-5 degrees Fahrenheit above normal for early January.

Aside from helping to create a rather pleasant day, this push of mild air may lead to some issues for the region, particularly areas that have been walloped by heavy snow. As temperatures increase, snow will begin to melt and release even more water into already swollen rivers and streams.

"Even with drier weather on the way, it will take a while for river levels to fall," Adamson said. "Therefore, flooding may still be an issue, even on days when the sun is shining."

In the northwestern portion of Washington state, sections of the Skokomish River are forecast to crest just under major flood stage, and remain at a moderate flood stage through Wednesday. It may take until early next week for some portions of the Skokomish River, and rivers like it, to fall below minor flood stage.

chart © Provided by AccuWeather

Another threat that will continue to make itself known despite largely dry conditions are landslides. In the aftermath of heavy rainfall and as snow began to melt, landslides began to impact portions of the Pacific Northwest. Landslides can lead to road damage and travel disruptions.

"Some rain and snow may fall in Washington and Oregon on Friday, but it will be light compared to recent events," Adamson said. "Dry conditions will return for the start of the weekend."

Even a break in the rain for several days will not erase the reality that many locations in the Northwest have already exceeded the typical values of monthly rainfall for January. As of Tuesday, Seattle has received 129 percent of its average monthly rainfall, while Portland, Oregon has received 104 percent. While the above-average amount of rainfall has contributed to a dreary start to 2021 for some, this rainfall has helped to erase drought conditions for many across Washington.

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