February 05, 2025

A More Serious Lowland Snow Threat for Later This Afternoon and Evening for Western Washington

The latest model forecasts and the recent movement of the offshore low are now more threatening for snow reaching the lowlands of western Washington.....so I wanted to provide an update.

The latest infrared satellite image shows the situation and threat for this afternoon.  A low west of the Oregon Coast is swinging bands of precipitation east and northward into western Oregon and Washington.   A first weak band went through Puget Sound early this morning leaving up to about an inch of snow near sea level (red arrow).  But it is the movement of the much stronger southern band (blue arrow) that is of more concern.  

The models have had a hard time with this band, particularly on how far north it will move,


The weather radar composite around 5 AM shows the situation in a different way.  You can see the exiting snow band north of Seattle and the more impressive snow band associated with the low over coastal Oregon.


To illustrate the effects of the first band, consider a Seattle cam located in NE Seattle.  About an inch of snow fell, but heavily traveled roads are ok.  Back roads are treacherous. 


The UW ensemble system of many high-resolution forecasts from last night shows substantial uncertainty in the forecast of snow over Seattle, but a mean prediction of about 2 inches at SeaTac.  The main snow action in Seattle will be after 4 PM this afternoon (00Z/06 in GMT/UTC time). 


What about the latest UW WRF model forecast?    Let me show you accumulated snowfall (NOT SNOW DEPTH) through the next 24 hours.

Through 1 PM. most of the snow is over NW Oregon and SW Washington


More movement to the north by 4 PM.


By 1 AM light snow will have extended through Puget Sound.


Note the end of the world, but many will see some snowflakes, except for the northwest portion of the state.
_____________________________

Steve Pool Scholarship Fund

We are now 65% to our goal of the $100K needed to create a permanent undergraduate scholarship in honor of Seattle's most well-known weather communicator,  the late Steve Pool.   

Please consider making a contribution (tax-deductible) to this University of Washington fund.   And thanks to the hundreds of folks who have already contributed.

Here is the info:

A Steve Pool memorial undergraduate scholarship has been established in his honor (see below)

Once funded by contributions, this new undergraduate scholarship will provide financial assistance to promising Atmospheric Sciences students, fostering the training of the next generation of meteorologists and atmospheric scientists.

If you want to contribute or learn more about Steve, check out the webpage below.   Thanks so much....cliff


19 comments:

  1. Hi Prof. Mass, can you shed some perspective on DOGE now doing their "thing" at NOAA and what that portends for weather forecasting product consumers?

    ReplyDelete
    Replies
    1. There will always be weather service predicting weather no matter what. Weather never stops.

      Delete
    2. Jerry - weather never stops, but the furnishment of uncompromised, fee-free weather products to the public is what's at stake. Part of the Project 2025 "plan" is to provide publicly funded and collected weather data exclusively to private enterprise, which then is resold back to the public, researchers, etc. for a fee. Imagine no longer being able to get a forecast from the NWS, but instead having to pay a fee (say, $5/mo) to Accuweather or weather.com to access forecasting products. I think that's outrageous because I already pay for NOAA and the NWS.

      Delete
  2. “Swinging bands of precipitation” I like that verbiage And learned something about offshore lows from the in house meteorological professor

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  3. The Rogue Valley in southwest Oregon has been in the bullseye of the combined cold and moisture over the past few days. Here in Medford at 1,400 feet, we've had about eight inches of snow. Lots of tree damage, unfortunately.

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  4. Hi Prof. Mass, do you think we're likely to have icy road conditions over the next few days with the temp fluctuating above/below freezing (per some models)?

    ReplyDelete
    Replies
    1. yes. its wet and cold out. Yes there will be ice. drive safe

      Delete
  5. All I can say is that it's wet as far as the streets are concerned, but it's been snowing here as of currently, likely a mixture of rain/snow or just snow at the moment. A dusting last evening mostly got rooftops and tops of cars but nothing else. Temps are in the mid to upper 30's at the moment at 12:30.

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  6. At around 600 feet, we've had at least a little bit of snow each night for the last 4-5 nights, and sometimes flurries in the day, too.

    It's a bit of a change from the usual way snow seems to happen in Western Washington - colliding cold and wet air masses dumping a bunch in 12-24 hours, and then it all melts away and is followed by rain, or it turns cold and dry for several days.

    This week feels almost like April, except it's cold enough that we're getting snow followed by sunbreaks, and then a little more snow, etc. instead of showers.

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  7. How should we "Note" the end of the world?

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  8. The NWS claims my temp [Ellensburg area] will get to 8°F next Wed morning. Not near record lows, but you lowlanders should stop complaining. 😇

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  9. Dear Mr Mass, for the first time in many years I need to share that you were not correct in this forecast lol! Currently watching about 3” so far fall to the ground up here in Bellingham. I’m pretty sure you said that northwest Puget sound area would not have any snow?? Haha!

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  10. Hey Cliff, what's this I hear you have up your sleeve for next Friday?
    Here in Silverdale at 500 feet we have 6 inches of snow so far, and it's still snowing to beat the band.

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  11. 8" new snow in Port Angeles last night, none at Hurricane Ridge. Odd.

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  12. We got 3inches in Port Townsend at 265ft above sea level. Looks like the heaver snow made it further north than predicted.

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  13. Here on Sinclair Inlet less than an inch of show, but enough to make steep driveways a barrier. Friends up on Kitsap Lake are reporting about 6-7 inches. We delayed trip to Seattle by a day.

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  14. I just found out Steve Pool Died, I don't know when it happened I moved to Moses lake twelve years ago. I met Steve Pool at the Puyallup fair, in the 90s, RIP brother we will hang out again one day.

    ReplyDelete

Please make sure your comments are civil. Name calling and personal attacks are not appropriate.

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