epiceast

Really impressed how this band is holding up as an expanding arc from Kelso to Spokane...

Graduated in '74, time for the men to go Emeritus. He's riding WRF harder than this forum at this oint.

Salem looking not bad for a quick snowfall tonight...

Dewey are you trying to troll me because you miss me

WRF balances out the snowfall between Seattle & Portland (Sorry Eugene). Add a dash of realism to this map, and they might need to use heavy equipment from Snoqualmie pass in Yakima Valley.

.4" qpf same as Yakima. so probably 6" and 8" at Yakima atm.

I wonder if somebody in Yakima valley is going to measure a foot tonight. I can't remember which model nailed this, going to go back in the thread right now.

Wild card submission: Asotin, WA @ 33 degrees.

But seriously, the western part of the band is getting a second life, seems like its trying to pivot around The Dalles/Hood River area...

Linear thinking

That's the case but it also has it dead by 10pm even in eastern Washington, so maybe there is more to come.

Way more North. Yakima is the bullseye

This is 10pm frame PST, so maybe wrf somewhat inaccurate...

WRF paints solid snow 4pm tonight to 4pm tomorrow for PDX metro

Yeah the low level placement and rates(low level clouds seeding snowflakes with additional accreation) are definitely a local phenomena. But the upper levels(700mb and higher) still drive the dynamics of the deformation zone/front. I was mostly just looking to see if there were any positive dynamics nearby to disprove what i saw on PDX radar mostly, but PDT zone looked even worse from band development perspective, more of a degeneration/shearing.

Yeah it's really tough to tell what's happening over the cascades(directly preceding what feeds your edge of the band). It could be just re-organizing around the western part of the broad trough so it might not die yet just get displaced to yakima/olympia/salem and separate from the main deformation zone. I think it's a lot more important to see what's happening in the place where the band originates rather than PDX radar.

Deformation band getting sheared apart it looks like.... Back edge very apparent on Pendleton radar now and it's moving north fast(WA/OR border atm). Bad for Pdx imo East part of the band looks healthier imo(moving towards Spokane). Hopefully it stays intact and tilts west and comes through as a reverse front.

I memba!

Strong band near Pdx, will it get rotated over? Odds are in favor of Pdx, the rest of the deformation's bands motion is westward, unless this is the last gasp of air for that band. We should see it quickly die in that case if the western edge keeping is keeping it intact to provide lift/convergence that is missing from the low moving away.

Too early to say, that's why it's "stressful". Also I just noticed that Lewiston is in the 40's today. Quite a precise arctic strike. Arctic air east of the great divide, some random valleys like mine filled with modified air mass(single digits), BC valleys & Columbia basin cold, PNW lowlands obviously cold enough to snow, but not no-man's land(magruder corridor forests) in Idaho.

Watching this deformation band action on radar must be really stressful for Portland snow lovers west of I-205.

Yeah definitely a resolution issue, you can see that Mission Ridge gets their biggest dump of the year though, and highest mtn totals.

Consistent with broad and deep easterly/south easterly flow near the surface & aloft

This is a super impressive deformation band for such a cold polar low, approximately forms a quadrilateral between Seattle, Portland, Baker city and Lewiston, about 200*350 miles

It's portland's turn now! I still think the deformation band might get rotated out of the basin over Pdx before dying later today/tomorrow.