444 
FXUS66 KPDT 301201
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
401 AM PST Sun Nov 30 2025

.UPDATED AVIATION...12Z TAFs...Fog may have significantly 
decreased, but the low stratus layer with light snow/mist will be 
the main highlights for this mixture of flight categories (MVFR
conditions or lower) for most sites except KDLS/KYKM/KPSC being 
VFR. KBDN will continue seeing light snow into this late morning 
(20-40% confidence). The low stratus layer may last through this 
late morning/early afternoon for KPDT, KRDM, KBDN, and KALW, which
should begin dissipating by then. However, patchy fog may return 
this early morning for KDLS/KPDT/KALW/KPSC but will continue to
monitor those areas. Winds will remain less than 10 kts. 
Feaster/97

&&


.PREV DISCUSSION... /issued 323 AM PST Sun Nov 30 2025/ 

.DISCUSSION...Snow is tapering off over the Blue Mountains as the
upper-level low that induced light snow across much of central to
eastern Oregon and southeast Washington exits to the southeast. 
In its wake, confidence is high (90 percent) that widespread low 
stratus accompanied by at least patchy dense fog will continue 
through this morning. Dry conditions are then anticipated into
Monday afternoon as upper-level ridging noses into the Pacific 
Northwest. This will likely (70 percent confidence) result in 
another round of stratus and fog for basin areas tonight through 
Monday morning.

Looking ahead, another shortwave embedded within northwesterly
flow aloft is advertised for late Monday through Tuesday night. 
Snow chances are reduced across the Columbia Basin and Blue 
Mountain foothills (10-30 percent chance of measurable snow per 
NBM guidance) compared to the one that brought low-elevation 
snowfall to the Blue Mountain foothills yesterday evening into 
early this morning, but a better moisture tap should facilitate 
slightly better chances (15-30 percent) of advisory-level snow 
for the Blue Mountains. Ensemble guidance is now also suggesting 
some locally breezy westerly winds through the Cascades gaps on 
Tuesday.

By the end of the week, ensemble solutions begin to diverge with 
regard to pattern details, specifically whether upper-level
ridging will persist on Friday (~60 percent of members) or a more
zonal pattern (~40 percent of members) will begin. By Saturday, a
transition to a more zonal upper-level pattern is present among 
all ensemble clusters. As far as tangible weather, this would 
result in warmer, wetter, breezier conditions. Of note, EFI 
values ranging from 0.5-0.8 across the Columbia Plateau are 
pointing to decent ensemble agreement in windy conditions relative
to model climatology.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  22  39  29  41 /   0   0  40  60 
ALW  25  37  31  38 /   0  10  50  60 
PSC  24  37  27  39 /   0   0  30  20 
YKM  24  38  26  43 /   0   0  20  10 
HRI  25  37  29  42 /   0   0  30  40 
ELN  22  37  26  42 /  10  10  20  10 
RDM  19  49  27  47 /   0   0  10  10 
LGD  21  42  31  41 /   0   0  40  80 
GCD  21  46  31  43 /   0   0  30  60 
DLS  30  42  35  49 /   0  10  30  20 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

SHORT TERM...86
LONG TERM....86
AVIATION...97