Seattle, WA

Another Powerful Storm System to Impact the Northwest Bringing Potential Flooding Dec 9 - Dec 10th

National Weather Force
Photo byNational Weather Force

Across the Northwest (including Washington & Oregon):

Already battered by back-to-back atmospheric rivers, the Northwest has experienced very heavy rain and snow. More is on the way. Another powerful storm system is set to slam into the region by Saturday morning, bringing very heavy rain, mountain snow, and gusty south winds. This weather is expected to persist through Monday before diminishing. A small break is expected with more mild conditions followed after before another active period.

Cities to be Impacted:

WA: Seattle, Bellingham, Spokane and Yakima.

OR: Portland, Bend, and Eugene.

Forecast Details:

A powerful system is expected to arrive by Saturday around noon. This system is forecast to bring another round of heavy rain, mountain snow, and gusty winds. Rainfall is projected to be around 1 inch north of Seattle and 2-4 inches along the coast from Washington down through Oregon. Although these totals are lower than those from our previous back-to-back storm systems, it won't take much to cause flooding, including river flooding and other issues across the area. Rivers are expected to potentially rise again, reaching action stage, especially with the combination of mixed precipitation in the mountains. There is also a risk of freezing rain due to the lower snow levels in the mountains. The front is anticipated to move out of the area by Monday, but lingering showers are expected due to the amount of moisture in the air.

Approximate Rainfall Totals:
Photo byNational Weather Force

Main risk: heavy rain leading to flooding, heavy snow and mixed precipitation across the mountains and gusty winds.

Stay tuned for more updates.


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With over a decade of experience in forecasting severe thunderstorms, this individual is a seasoned forecaster and developer. Their expertise in severe weather forecasting and computer science is entirely self-taught, complemented by a foundation in Atmospheric Science from UNCO and an IT background from WGU. They have dedicated their efforts to developing innovative tools that enhance the accuracy of analyzing large hail and tornadoes. As a significant contributor to National Weather Force & Southern California Weather Force, they have played a crucial role in providing accurate and timely information, as well as developing tools to keep those affected well-informed.

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