546
FXUS66 KPDT 282134
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
234 PM PDT Wed Oct 28 2026

.KEY MESSAGES...

- Intermittent light mountain snow/rain through the weekend

- Breezy south to southwest winds diminishing this evening

- Below normal temperatures through the week

&&

.DISCUSSION...
Satellite showed cumulus over large sections of the forecast
area This Afternoon with radar returns indicating at least
intermittent showers and virga across the Columbia Basin. North
Central Oregon and the Gaps. The most concentrated area of radar
returns and cloud cover remained across the Cascade Crest and
Eastern Slopes of the Washington Cascades. Wind gusts as high as
43 mph with locally sustained winds at 30 mph were seen at the
PSC airport. Elsewhere, gusts of 25 to 35 mph area were more of
a common range. Breezy to windy/gusty conditions across the
Columbia Basin and the foothills of the Blue Mountains, will
gradually diminish late this afternoon and evening as the HRRR
is showing 30 to 35 mph gusts across these zones early this
afternoon weakening to around 20 mph by 5 pm. Locally gusty
winds can persist in the area of the horse heaven hills
southwest of the Tri-Cities.

A winter weather advisory for snow accumulations remains in
effect for the upper slopes of the Washington Cascades This
afternoon through 5 pm. Here the HREF 50th percentile takes the
snow accumulations up only about 1 more inch in the late
afternoon and upwards of 2 more inches on the 75th percentile.
At this time, the advisory will not be extended in time. HRRR
fields show a steady drop in the snow accumulations though the
evening hours.

Continuously cooler than average temperatures are anticipated
through the week as cyclonic flow aloft maintains cooler mid
level air and clouds alongside occasional mountain showers. The
next better chances for accumulating mountain snows comes
Thursday Night and into Friday morning as the EC/GFS shows the
upper low off the WA coast pivoting southward enough to develop
more of a diffluent flow aloft over the region, and NBM amounts
to very little snow, less than an inch in comparison this
Today`s episode. Subfreezing overnight temperatures continue to
point areas that have not seen a true growing season ending
freeze, and as is typical is the Columbia River Gorge again is
last. Friday night/Saturday morning`s probabilistic low
temperatures near and around The Dalles isnt convincing of a
freeze, as high probabilities/chances exist for lows below 36
degrees (80 percent or more), but for 32F or colder, its
roughly less than 5 to 20 percent chances across the entire
zone. Cloud cover will be a primary contributing factor for any
freeze watches and warnings (or not) going forward.



&&

.AVIATION /18Z TAFS THROUGH 18Z THURSDAY/...
VFR conditions currently across all sites, which will stay the
course through the period. Light, brief showers will still be
possible for KDLS/KPDT/KYKM/KALW through this afternoon, with
only KDLS possibly dropping to 6 SM visibilities due to rain
showers. Breezy afternoon winds at KPSC/KPDT/KRDM/KBDN as gusts
of 20-25kts are likely. 75

&&

.Preliminary Point Temps/PoPs...
PDT  33  52  32  50 /  10   0   0   0
ALW  36  54  35  49 /  20   0   0   0
PSC  30  54  31  53 /   0   0   0  10
YKM  27  52  31  52 /   0   0  30  30
HRI  31  52  31  51 /   0   0   0   0
ELN  22  46  23  47 /  10   0  20  40
RDM  21  51  21  50 /  10   0   0   0
LGD  29  56  30  57 /  30   0   0   0
GCD  28  57  31  55 /  10   0   0   0
DLS  33  54  34  54 /  30   0  20  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
WA...Winter Weather Advisory until 5 PM PDT this afternoon for
     WAZ522.
OR...None.

&&

$$

DISCUSSION...71
AVIATION...75