Pendleton, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

993
FXUS66 KPDT 250558
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
958 PM PST Wed Dec 24 2025

.Updated for Aviation...

.AVIATION...
06Z TAFS...VFR conditions currently prevail across the region.
However, guidance indicates there could be some MVFR or lower
conditions developing overnight in fog/stratus. Additionally, the
latest guidance is not as pessimistic as previous. But, using
pattern recognition and looking at where there were issues last
night/earlier today then PDT, PSC and DLS look to have the highest
chances of seeing MVFR or lower conditions.

Winds will generally be light through the period, except at RDM
and BDN which will see some gusts to around 25 kt on Thursday
afternoon.

&&

.PREV DISCUSSION... /issued 255 PM PST Wed Dec 24 2025/

DISCUSSION...Relatively unorganized showers will continue this
afternoon through Thursday night as a broad area of low pressure
churns just offshore. While some light mountain snow (generally
one inch or less) is forecast, not anticipating anything worth an
advisory.

Windy conditions are beginning to taper off across northeast
Oregon and southeast Washington, so have allowed the High Wind
Warnings to expire on schedule at 2 PM. Late tonight into early
Thursday afternoon, expecting (80 percent confidence) another
round of south to southeast winds of 20-35 mph with gusts of 30-45
mph along the slopes and base of the northern Blue Mountains.
That said, have held off on issuing any wind highlights as an
HREF-advertised 850-mb jet of 30-45 kts is marginally supportive
of an advisory and NBM probabilities suggest a 50 percent chance
or less of 45-mph wind gusts. Given the synoptic pattern, areas
most prone to downslope winds such as along I-84 in the vicinity
of Cabbage Hill will most likely (80 percent confidence) exceed 45
mph, but thinking areal coverage is too limited to justify an
advisory. For reference, the HREF was forecasting a 50-70 kt
850-mb jet this morning, and this translated into maximum wind
gusts of 60-80 mph along the base and slopes of the northern Blue
Mountains.

Some patchy fog is forecast this evening and tonight across the
forecast area, but confidence in coverage is too low to issue any
headlines for it.

Looking ahead, an upper-level shortwave trough and attendant cold
front will facilitate more organized precipitation Friday into
Saturday. NBM probabilities suggest a 40-70 percent chance of
advisory-level snowfall for the 24-hour period of 10 AM Friday to
10 AM Saturday across the northern Blue Mountains and OR/WA
Cascades. Moreover, breezy to windy westerly winds are expected to
accompany the system Friday and Friday night. NBM probabilities
paint a 40-80% chance of advisory-level wind gusts (45 mph or
greater) across the Columbia Plateau during the aforementioned
period. Have held off on issuing any highlights for winter weather
or wind given the long lead time.

By late Saturday, confidence is high (90 percent) that an upper-
level ridge of high pressure will park itself over the Pacific
Northwest, ushering in dry conditions areawide. Will we finally
see a widespread cloudy cold pool event (stratus/fog in the
Columbia Basin/Plateau)? It`s too early to tell for sure, but have
added a mention of patchy fog in the forecast.

AVIATION...00Z TAFs...As this system gradually moves out of our
forecast area, KDLS/KPDT/KALW will be VFR until tonight with low
clouds lingering for these sites thus making them MVFR or lower. Fog
may return for KPDT/KALW tonight, possibly dropping VSBYs to 1/2SM
or below (40-50% confidence). KPDT might see VSBY improving slowly
Thursday morning hours, but will monitor for any fog development.
KALW may see fog clear out around Thursday late morning as VSBY
increase to 2SM or higher. The remaining sites will be VFR through
this TAF period with KYKM having a 30% probability for light rain
Thursday early morning. Winds have decreased from earlier and will
be at 10kts or less for the rest of today and Thursday. Feaster/97

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  33  51  35  49 /  20  30  30  60
ALW  36  51  37  49 /  30  30  50  80
PSC  31  45  32  49 /  10  30  40  50
YKM  28  42  30  43 /  10  50  30  30
HRI  32  47  32  48 /  10  30  40  50
ELN  25  37  26  37 /  10  70  40  50
RDM  28  50  28  45 /  20  20  20  40
LGD  37  49  36  45 /  30  40  50  80
GCD  35  50  35  44 /  20  40  50  80
DLS  35  45  36  46 /  20  60  50  70

&&

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

$$

SHORT TERM...86
LONG TERM....86
AVIATION...77