FXUS66 KPDT 270949

AFDPDT



Area Forecast Discussion

National Weather Service Pendleton OR

249 AM PDT Mon Oct 27 2025



.KEY POINTS...



1. Lingering mountain snow



2. Mostly dry conditions return to low elevations 



3. Precipitation will return this weekend



.DISCUSSION...Today through Thursday...Current radar shows the

PSCZ has dissipated. However, there are still some snow showers

over the WA Cascades. Cameras along the I-90 and over Santiam Pass

shows snow is still ongoing. Snow over the I-84 corridor and up

through Tollgate and Ski Bluewood has tapered off since earlier

in the period. Lingering snow showers are expected to continue

through the morning, however, accumulations will be light with

60-80% probabilities of an additional 2 inches accumulating

through late Monday morning. 



Models show that once this shortwave moves across, the leading 

edge of an upper level ridge will begin to move into the region. 

Northwest flow aloft will replace the southwest flow and 

precipitation will mainly linger across the mountains with 

upslope flow. With the incoming ridge, NBM shows snow levels to 

steadily increase and temperatures to warm enough that the 

precipitation that lingers through Monday will be a rain snow mix

and then mainly rain Tuesday. Raw ensembles show 80% 

probabilities of mountain precipitation to accumulate 0.10 inches 

of precipitation with 50-60% showing up to 0.50 inches on 

Tuesday. By Tuesday afternoon, the axis of the upper level ridge 

will be mostly overhead allowing for dry conditions to persist 

across the region through Thursday.



Friday onward...Confidence in the next round of precipitation is

moderate (40-60%) as models show the upper level ridge to begin 

flattening as an upper level trough begins to push in off the 

coast of BC. This will bring another round of widespread 

precipitation as well as another round of mountain snow. 90





&&



.AVIATION...06z TAFs...VFR conditions are expected through the

period. Low sct-bkn cigs will gradually clear out heading into

Monday morning, leaving all sites with persistent westerly winds

less than 15 kts. 74





&&



.PRELIMINARY POINT TEMPS/POPS...

PDT  54  30  56  37 /  10   0   0  10 

ALW  53  35  55  41 /  20   0   0  20 

PSC  58  28  52  35 /  10   0   0  20 

YKM  55  29  50  33 /   0   0  10  40 

HRI  56  29  54  36 /  10   0   0  10 

ELN  50  25  47  31 /  10   0  20  60 

RDM  50  24  61  34 /   0   0   0  20 

LGD  48  26  52  36 /  30   0   0  10 

GCD  48  26  57  32 /   0   0   0   0 

DLS  56  36  55  41 /  30  10  10  60 



&&



.PDT WATCHES/WARNINGS/ADVISORIES...

OR...Winter Weather Advisory until 8 AM PDT this morning for ORZ502.



     Winter Weather Advisory until 5 AM PDT early this morning for 

     ORZ509.



WA...Winter Weather Advisory until 8 AM PDT this morning for WAZ030.



     Winter Weather Advisory until 5 AM PDT early this morning for 

     WAZ522.



&&



$$



SHORT TERM...90

LONG TERM....90

AVIATION...74