889
FXUS66 KPDT 112132
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
232 PM PDT Sat Oct 11 2025

.DISCUSSION...

Regional 88D Radar shows returns that vary form virga to actual
rain showers in spots, as temperatures climbed into the 50s in
most areas. The warmest locations as of 1 pm was DLS and EAT in
the low 60s. The clouds and widely scattered showers are in
response to a lobe of 400-250mb potential vorticity rotating
across the region. Going forward, the 3-hr HREF QPF ensemble
matched mean precipitation shows significant rain shadowing
through Sunday afternoon before the next mid level impulse starts
to impact the greater area.

The likelihood for minor impacts ramp up Sunday afternoon and
Sunday night. Chances for impacts from snow amounts (5-70%) or
snow rates (5-40%) are well relegated to the higher terrain along
the Cascades. Winter weather advisories have been issued for
areas above 4000 ft for the Upper Slopes of the Eastern Washington
Cascade Crest, as well as the Eastern Slopes of the Oregon
Cascades (zones OR509 and WA522). Additionally the Wind Advisory
mainly for the Columbia Gorge and Simcoe Highlands area remains in
place from late Tonight through early Sunday morning. Snoqualmie
pass is unlikely to have moderate or even minor impacts as melting
and road temperatures should play a significant role in limiting
risk. Falling snow along sections of U.S. Hwy 12 west of Yakima
Sunday Night, however has a higher risk for minor accumulation as
well as decreased visibility due to enhanced snow rates. Santiam
pass, at around 4800 feet and White Pass at around 4500 may be at
a high enough elevation for snow accumulation, especially creating
slippery roads and hazardous travel conditions. Russell/71

&&

.PREV DISCUSSION... /issued 1036 AM PDT Sat Oct 11 2025/

Updated for Aviation

AVIATION...
18Z TAFS...VFR conditions are expected through the TAF period.
Most sites will become gusty in the 20 to 25 kts later today
through this evening, with some lingering winds at KPDT into
Sunday. RA is expected to develop at PDT/ALW this evening into
tonight and DLS on Sunday with lower chances elsewhere, so they
were not included but most areas have at least 20-30 percent
chances of seeing some RA through the period.


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  42  54  40  57 /  60  70  80  50
ALW  45  53  42  58 /  70  80  80  50
PSC  43  58  41  59 /  40  60  80  50
YKM  41  56  38  51 /  30  60  90  80
HRI  44  56  41  58 /  40  60  70  50
ELN  37  51  33  50 /  40  70  90  70
RDM  33  52  31  49 /  30  50  80  70
LGD  39  50  37  53 /  90  80  80  50
GCD  36  50  37  54 /  60  50  80  50
DLS  48  58  43  55 /  50  90  90  80

&&

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

     Winter Weather Advisory from 2 PM Sunday to 1 PM PDT Monday for
     ORZ509.

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

     Winter Weather Advisory from 2 PM Sunday to 1 PM PDT Monday for
     WAZ522.

&&

$$

DISCUSSION...71
AVIATION...LN