225
FXUS66 KPDT 092251
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
351 PM PDT Thu Oct 9 2025

.DISCUSSION...Current radar and satellite imagery shows high clouds
developing along the WA/OR Cascades with few cumulus clouds over
Central OR. With a stationary low pressure system near the PacNW
coast, this will influence the upslope flow to continue light
showers across the WA/OR Cascades through tonight (15-30% chance).
Winds will be relatively light with occasional breezes as well.
However, tomorrow is when the upper level trough gradually makes its
way across our forecast area with a frontal system. Showers will
then develop over the WA/OR Cascades first before becoming
widespread tomorrow late afternoon into evening hours. NBM-CONUS
favor a 30-60% probability for the Cascades, Central OR, and North
Central to receive wetting rain amounts (0.10-0.15"), but a 20-40%
prob for 0.20" or more. The lower elevations will most likely have
less than 0.10" (>40% chance). By Saturday, we will start seeing
widespread showers as the trough sweeps through the forecast area.
Given the trough`s arrival strengthening the surface pressure
gradients, this may cause an uptick in the wind gusts up to 40-50
mph for the Gorge and Simcoe Highlands during Saturday night into
Sunday early morning, which warranted an Wind Advisory for that
timeframe. Starting later Sunday morning, gusty winds will then
decrease to 30 mph before becoming breezy (15-25 mph) by afternoon.

In addition to the ongoing troughing pattern, there is also a
potential chance (30-40%) for the Upper Slopes of Eastern WA
Cascades and portion of Kittitas Valley to see snow up to 3 ft this
weekend through Monday with snow levels dropping to 4000-4500ft.
With these conditions not meeting the criteria, we will hold off on
issue an Winter Weather Advisory at this time, but will continue to
monitor. Another round of widespread showers will persist Monday
morning but with the lower elevations becoming dry into next week.
However, showers may linger over the OR Cascades, Central OR, and
eastern mountains with a slight chance (<30%). Winds will be slightly
breezy Monday across the Cascade gaps, but becomes light Tuesday
onward. Feaster/97

&&

.AVIATION...
...18Z TAFS (Previous Discussion)...VFR conditions are expected
through the TAF period. Winds will mainly be 10 kts or less.


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  47  72  43  61 /  20  10  40  50
ALW  50  73  47  61 /  20  20  40  60
PSC  45  74  44  64 /  10  10  20  30
YKM  50  72  41  63 /  10  30  20  40
HRI  45  72  44  63 /  10  10  30  30
ELN  45  68  39  58 /  10  40  40  40
RDM  40  64  31  54 /  10  60  70  50
LGD  47  77  41  58 /  10  10  30  60
GCD  46  72  39  57 /  10  10  30  40
DLS  51  67  47  62 /  20  50  60  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Wind Advisory from 11 PM Saturday to 5 AM PDT Sunday for ORZ041.

WA...Wind Advisory from 11 PM Saturday to 5 AM PDT Sunday for WAZ024-
     521.

&&

$$

DISCUSSION...97
AVIATION...77