Western US weather expert

Unsettled week for northwestern US as several storm systems move through

By Jordan Root, AccuWeather meteorologist
4/09/2018, 8:18:21 PM

An active week of weather is upon us. The northwestern U.S. will see several storm systems and fronts come through this week into the weekend that will deliver wind, rain and mountain snow.



Satellite valid late Monday afternoon shows the energy that will impact the Northwest on Tuesday.

The first storm will arrive Tuesday morning. Winds will increase along the Oregon and Washington coast with gusts up to 65 mph expected, strongest in Oregon. Winds will increase Tuesday afternoon around Puget Sound where gusts could peak around 50 mph. Some tree damage and power outages will be possible.


Strong upper-level winds will move through Tuesday and will mix down to the surface causing strong surface gusts. The coast will see the highest gusts Tuesday morning while winds around Puget Sound increasing during the afternoon.

Showers and even a steadier round of rain will move through western Washington and Oregon Tuesday with most places seeing between 0.25 to 0.75 inches of rain, the highest amounts in the upslope mountain areas.

Snow levels will start very high Tuesday morning and will fall to about 4,500 to 5,000 feet by the end of the day Tuesday. There can be 3 to 6 inches of snow generally above 6,000 feet.

Some lingering rain and snow showers will occur Tuesday night before the next system comes in.

This system will be colder and stronger and will arrive Wednesday morning, continuing through Thursday in Washington, Oregon, and Northern California.

There will be alot of upper-level energy that dives farther south into Northern California resulting in a period of heavy rain and mountain snow.


Snow levels will drop to around 2,500 feet in the Cascades by Wednesday night and around 4,000 to 5,000 feet across the northern Sierra Nevada. There can be a foot of fresh snow and up to 2 feet in the Cascades.

Snow will also fall across the Montana Rockies and Tetons Thursday that can accumulate around a foot.

Heavy rainfall between 1 and 3 inches is expected across southwestern Oregon and far Northern California which can lead to isolated mudslides or flooding, especially in burn scar areas.

Another storm system is expected to drop into the Northwest over the weekend with more rain and snow.

The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com


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Western US weather expert