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PNW February 2023 Weather Discussion - Meteorological winter finale

Anti Marine Layer

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Posted by The Ms. Anthrop,

Really, really lovely cumulonimbus action tonight! I just happened to have my drone in the car and got some solid shots of DT Seattle/Lake Washington/Mercer Island/Bellevue looking north from Skyway. Alas, the focal length of the lens doesn't do the vertical height justice and my WB was off rendering it into semi-gross HDR territory, but still... fun looking weather! It was quite windy- I was flying right at 390 ft and the drone was giving me all sorts of warnings about sustained winds/gusts. 

insta pin. glorious cloud pics!

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Posted by Gradient Keeper,

A most incredible snow storm. At times the snowfall rates have been as heavy or slightly heavier than January 2017. Temp 27.5, Dewpoint: 27.1 with gusty east wind and very heavy snow continuing. I'm at 11 1/2" now! UNBELIEVABLE!!!! This pic does no justice at all.

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

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Posted by ajreich,

NBM is quite an interesting product! Their weighting algorithm is moderately complex and dynamic, though does has some drawbacks as we saw yesterday. For those who don't know, NBM is an attempt by NOAA to create a super probabilistic forecast model that ingests output from all the models above and outputs forecast guidance for local offices that help them to gauge the relative odds of particular weather outcomes. The 'special sauce' is the post-processing, normalization and weighting that they d
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Posted by BLI snowman,

18 at PDX. First low in the teens there since January 2017.
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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

INCOMING.

gfs_mslp_pcpn_frzn_nwus_32.png

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Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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Gradient Keeper
Gradient Keeper

A most incredible snow storm. At times the snowfall rates have been as heavy or slightly heavier than January 2017. Temp 27.5, Dewpoint: 27.1 with gusty east wind and very heavy snow continuing. I'm a

OysterPrintout
OysterPrintout

WHAT an event. Huge overperformance for us at this location. Measured 5.5" of snow. Just incredible.   

SilverFallsAndrew
SilverFallsAndrew

Saw this posted on social media. 

Posted Images

SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted
1 minute ago, FroYoBro said:

Washington weenies can’t comprehend Oregon possibly getting snow. The 12z looks great down here, but obviously still plenty of time for details to change. Certainly no sign of a rug pull yet like a few of our Washington weenies started to mention yesterday. 

I see...

  • scream 2

Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

Check out how deep the trough is on the GEM. 

gem_mslp_pcpn_wus_24.png

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Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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TT-SEA Grand Master

TT-SEA

Posted
Posted
5 minutes ago, Christensen87 said:

More snow next weekend. 

Buyer beware on any snow the GFS is showing after the flow returns to onshore and zonal.   It will end up showing 40 inches of 40-degee snow in that pattern.   😀

**REPORTED CONDITIONS AND ANOMALIES ARE NOT MEANT TO IMPLY ANYTHING ON A REGIONAL LEVEL UNLESS SPECIFICALLY STATED**

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

The 2nd trough digs a little too far offshore still on the GFS, lets see if we can work on that. 

  • Like 1

Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

Still SCORES!

prateptype_cat-imp.us_nw.png

  • Like 4

Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

That 2nd trough is more like 500-1000' snow levels. Which makes sense. 

snku_024h-imp.us_nw.png

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Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

GREAT GFS run. 

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Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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Jbolin Mentor

Jbolin

Posted
Posted
13 minutes ago, FroYoBro said:

Washington weenies can’t comprehend Oregon possibly getting snow. The 12z looks great down here, but obviously still plenty of time for details to change. Certainly no sign of a rug pull yet like a few of our Washington weenies started to mention yesterday. 

I can, you guys have been on quite a sh*tty run lately.

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Cascadia_Wx Grand Master

Cascadia_Wx

Posted
Posted
2 minutes ago, RentonHill said:

Hard to imagine that ALL of our cold air in the region gets completely pushed out before that second trough. Is the fact its coming from the NW make a difference? As compared to something coming straight west or SW?

Yeah, when a trough comes in from the NW is usually a quick switch to onshore or southerly gradients with lower pressure to the north of the region, at least initially. That’s why most of our best overrunning events are systems coming in from the southwest. Keeps lower surface pressure to the south or offshore which maintains offshore flow and cold air at the surface.

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Summer ☀️ grows while Winter ❄️  goes

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

NWS Point Forecast

Tuesday Night
Snow. Mostly cloudy, with a low around 29.
Wednesday
Snow showers likely. Mostly cloudy, with a high near 34.
Wednesday Night
Snow showers likely. Mostly cloudy, with a low around 19.
Thursday
A chance of snow showers. Partly sunny, with a high near 30.
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Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

Unfortunately the 3rd trough appears to drop a little to far offshore. But we have time to work out that detail. 

Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted
Just now, RentonHill said:

GEM sucks

 

500h_anom.na (8).png

Looks very lost with our reload. Sad to see such an esteemed model struggling so much. 

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Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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TT-SEA Grand Master

TT-SEA

Posted
Posted

In general the models the models are showing more precip on Wednesday and Thursday now... the result of much less digging to the SW with the cold trough.    This creates up many more snowy possibilities.   

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**REPORTED CONDITIONS AND ANOMALIES ARE NOT MEANT TO IMPLY ANYTHING ON A REGIONAL LEVEL UNLESS SPECIFICALLY STATED**

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SouthHillFrosty Grand Master

SouthHillFrosty

Posted
Posted (edited)
7 minutes ago, TT-SEA said:

In general the models the models are showing more precip on Wednesday and Thursday now... the result of much less digging to the SW with the cold trough.    This creates up many more snowy possibilities.   

GEF didn’t change much…. Looks like some people at least will get 1-4in next week

2843BCA8-1233-48BA-A695-6CD04BCDE880.png

Edited by SouthHillFrosty
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Phil Grand Master

Phil

Posted
Posted
8 hours ago, MR.SNOWMIZER said:

I don't believe any of that hog wash. This is just guessing. 

If you want to believe falsehoods I can’t stop you. 🤷‍♂️ 

6 minutes ago, TT-SEA said:

In general the models the models are showing more precip on Wednesday and Thursday now... the result of much less digging to the SW with the cold trough.    This creates up many more snowy possibilities.   

It was mainly just the GFS with that offshore digging and cutting off of the trough. Which will become a theme with that model if the last 2 years are any indication.

foto26446a4f1f801ef3b3d1564dea31df66.png
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MossMan Grand Master

MossMan

Posted
Posted
2 minutes ago, TT-SEA said:

In general the models the models are showing more precip on Wednesday and Thursday now... the result of much less digging to the SW with the cold trough.    This creates up many more snowy possibilities.   

How I look every time I see a Tim post pop up leading up to an event….

Ah it was a good post…I can relax now! 🤣

84388680-1244-45D5-9C8E-C10E87A726D8.jpeg

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Elevation 580’ Location a few miles east of I-5 on the Snohomish Co side of the Snohomish/Skagit border. I love snow/cold AND sun/warmth! 

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Doinko Grand Master

Doinko

Posted
Posted
16 minutes ago, TT-SEA said:

In general the models the models are showing more precip on Wednesday and Thursday now... the result of much less digging to the SW with the cold trough.    This creates up many more snowy possibilities.   

Great seeing GEM onboard too. Full on blast on all three models

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yellowstone Rising Star

yellowstone

Posted
Posted
32 minutes ago, SouthHillFrosty said:

Summer vibes

E9CCCA72-F451-4B76-BE96-999B48131F1B.png

7829A134-3CAF-47BA-ADBE-E376355E534D.png

Please tell me this is meant to be a joke? Average high in Seattle for this date is 51. I can never really tell when people are being dead serious vs. tongue in cheek here after seeing people earnestly use the word “torch” to describe a 1 degree single day temp deviation in December. 

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Cold Snap Grand Master

Cold Snap

Posted
Posted

Well I was planning on maybe coming back from my trip on the 23rd but if the models start picking up on what the GFS is that might not be able to happen lol. Supposed to come back on the 25th right now but it looks like even then there could be an overrunning event. Guess that’s what happens when you plan a trip in the winter time even if it’s late February.

2023 - 2024 Cold Season Stats

Total Snowfall - 0.75”

Max Snow Depth - 0.5”

Coldest High Temp - 21 (Jan 13)

Coldest Low Temp - 9 (Jan 13)

Number of Freezes - 51

Sub-40 highs - 12

Highs 32 or lower - 3

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SilverFallsAndrew Grand Master

SilverFallsAndrew

Posted
Posted

GFS ensembles are not backing down. 

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Snowfall                                  Precip

2022-23: 95.0"                      2022-23: 17.39"

2021-22: 52.6"                    2021-22: 91.46" 

2020-21: 12.0"                    2020-21: 71.59"

2019-20: 23.5"                   2019-20: 58.54"

2018-19: 63.5"                   2018-19: 66.33"

2017-18: 30.3"                   2017-18: 59.83"

2016-17: 49.2"                   2016-17: 97.58"

2015-16: 11.75"                 2015-16: 68.67"

2014-15: 3.5"
2013-14: 11.75"                  2013-14: 62.30
2012-13: 16.75"                 2012-13: 78.45  

2011-12: 98.5"                   2011-12: 92.67"

It's always sunny at Winters Hill! 
Fighting the good fight against weather evil.

 

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