150 
FXUS66 KPDT 191034
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
234 AM PST Wed Nov 19 2025

Updated Aviation Discussion

.DISCUSSION...Skies are clearing across much of the forecast area
early this morning as a ridge of high pressure accompanied by 
cold and dry air slides into the PacNW. Low clouds are lingering 
(and even building) across some of our elevated valleys in central
and eastern Oregon, but otherwise much of the Basin and mountain 
foothills are seeing clear skies. Could see patchy fog develop 
across some of our usual fog-prone areas along river valleys, but 
given the lack of a temperature inversion present across obs, 
thinking is that this morning will just be cold, with much of the 
forecast area seeing below-freezing temps. As of this discussion's
writing, the Freeze Warning in the Columbia River Gorge is 
flirting with verification with temps in the mid to upper 30s, and
as long as low stratus does not form via light easterly winds, 
the last of our freeze-eligible zones should finally fall. 

Looking ahead, Wednesday will be dry before our forecast area is 
clipped by the next system - a low diving to our south and east 
before settling over southern California. The trajectory of this 
system is not favorable for widespread precip, so as of now, the 
forecast for late Wednesday into Thursday looks to be that of light 
mountain snow generally less than an inch above primarily 4500-5000 
ft, with perhaps a stray shower impacting the Basin (15-30%) via 
wraparound moisture from the low as it digs to our south. But with 
most of this system's moisture landing to our west, impacts are 
overall anticipated to be minimal. 

We enter another relatively benign pattern Friday through Sunday as 
ridging, slightly dirty in nature, prevails over the region. 
Guidance favors persistent shower chances across primarily the WA 
Cascades over the weekend, but QPF is once again minuscule. Ensemble 
guidance starts to diverge Monday onward, but some members do depict 
an upper-level wave moving down from the ridge upon us early Monday 
morning, which would provide for the next-best chance for area-wide 
precip. But beyond that, forecast confidence weakens (30-40%) as 
ensemble solutions diverge in light of a relatively progressive 
synoptic pattern. 74 

.AVIATION...12Z TAFs...Mostly VFR conditions forecast through the
period. Chances of fog developing at any site tonight is 15% or 
less, though that said a few pockets are beginning to develop 
around site PDT per satellite. Will continue to monitor for 
potential impacts. Otherwise, a system arriving to the region will
increase mid level cloud cover to bkn-ovc between 5kft to 12kft 
AGL around or after 03Z at all sites, with a potential for a 
rain/snow mix and MVFR or lower CIGS/vsby developing at sites 
RDM/BDN around 09Z tomorrow. Winds will remain light, 12kts or 
less, through the period. Lawhorn/82


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  48  32  47  32 /   0  20  30   0 
ALW  48  35  46  36 /   0  20  40  10 
PSC  49  32  49  30 /   0  10  10   0 
YKM  48  32  50  29 /   0  20  10   0 
HRI  48  34  48  31 /   0  20  20   0 
ELN  45  29  48  29 /   0  20  10  10 
RDM  50  28  47  23 /   0  60  20   0 
LGD  50  34  50  30 /   0  20  50  10 
GCD  53  35  49  29 /   0  30  40   0 
DLS  50  39  52  36 /   0  60  40  10 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Freeze Warning until 10 AM PST this morning for ORZ041.

WA...Freeze Warning until 10 AM PST this morning for WAZ024.

&&

$$

DISCUSSION...74 
AVIATION...82