Major Wind Event For Western Oregon and Washington

A major wind event is now probable for western Oregon and Washington, potentially the strongest windstorm so far this winter.

Very strong winds, with gusts to 50-80 mph, will move up the Oregon coast this evening and then pummel western WA in the morning hours, ending with a powerful surge of westerly winds in the Strait.

This is serious, so I would be prepared (batteries, don't drive around during strong winds, etc.).  There will be power outages.

The 8 AM GOES-17 weather satellite imagery shows the storm west of northern CA and southern Oregon (you can see the swirl of the clouds).

And the sea level pressure forecast for 10AM this morning suggests an elongated area of low pressure associated with the storm, with an area of very large pressure change (gradient) to its south. THAT is where the strong winds will be.

By 10 PM tonight, the area of large pressure change moves along the northern Oregon Coast, bringing very strong winds from Seaside down to North Bend.

Three hours later (1 AM Sunday) the hyper pressure gradient reaches southwest Washington.

And by 4 AM has pushed over Northwest Washington, including Puget Sound.

I will now show you the output of the UW high-resolution ensemble system, probably the best regional ensemble system in the U.S. (this is the kind of system I have been trying to convince the National Weather Service to do nationally).   The graphic is from the Seattle WindWatch website, by the way (and was create by UW Research Meteorologist Jeff Baars).

This graphic shows the maximum wind gust forecast over Seattle from a large number of high-resolution forecast runs.    Wow.  I am charging my smartphone immediately!  Nearly all of the forecasts are going for a significant event (gusts over 40 mph) and several have gusts over 50 mph! The timing of the peak winds vary a bit (between roughly 1 and 7 AM).

Now let me give you a more spatial view, showing the 4-km resolution WRF run made at the UW this morning. 

At 10 PM tonight (Saturday), really strong winds (blue and brown colors) are hitting the northern Oregon coast (up to 65 knots, about 75 mph!)

By 1 AM, the WA coast is being savaged by 50+ knot gusts, and strong winds are just reaching Olympia.

One hour later, Puget Sound is in the crosshairs of mother nature, with up to 60 kt gusts reaching south Seattle.   Big winds continue on the coast.

At 4AM, winds have decreased slightly over Puget Sound, but an extraordinarily strong westerly wind surge has pushed into the eastern Strait of Juan de Fuca, northern Whidbey Island, and the southern San Juans.   We are talking about 60 knot gusts.

In short, it is highly probable that this will be a major wind event.  Perhaps not the equal of the truly historic storms (eg., Chanukah Eve and Inauguration Day Storms), but quite possibly the big wind event of the winter.   The only thing that will help mitigate the power outages is the pruning by previous wind events.  But I expect that tens of thousands will lose power over the region.

Now back to charging all my electronic gear.

from Cliff Mass Weather and Climate Blog http://bit.ly/2RzoClY