839
FXUS66 KPDT 120546
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
946 PM PST Tue Nov 11 2025

.UPDATED AVIATION...06Z TAFs...Most sites are currently in VFR
except for KALW being in LIFR due to low clouds and fog/mist.
VSBYs and/or CIGs for KALW/KPSC may drop to MVFR conditions or
lower from the low clouds and/or fog/mist. However, this should
improve around late Wednesday morning (18Z). Will continue
monitoring to see the extent of the fog/mist over KALW/KPSC and
other sites, if further materializes through the rest of this
evening. Winds will be less than 10kts. Feaster/97

&&


.PREV DISCUSSION... /issued 230 PM PST Tue Nov 11 2025/

.DISCUSSION...Clear skies with some high cloud bases entering the
southern part of the CWA near Central OR. Most of the fog we
observed from earlier this morning has since been lifted. We will
continue to be under the influence of a ridge over the next day,
that will continue our pattern of dry and light conditions save
for some mountain rain showers over the Cascades. Abundant upper
level moisture coupled with the increases influences of an
incoming trough will bring overcast skies through the night.
Though I`m a little less confident on the fog tomorrow morning
(10-15% chance) given the overcast skies, but none the less I
still put in some areas of patchy due to low level confidence, but
not expecting it to be as widespread as we saw this morning.

As we head into Thursday through Friday, a stationary front will
influence the pattern and increase coverage of precipitation
through the region. Every area by late Thursday evening/early
Friday morning will see 40-60% chances of PoP. This will mostly be
a rain event, but snow showers look to develop in the Cascades and
parts of the Eastern mountains as snow levels drop to 4500 to
5500 feet with accumulation looking to top of at around an inch
(50-70% chance) in the highest crests of the Cascades. Things will
dry out mostly in the Basin by the weekend due to a ridge
developing around the trough, creating a cut off low in southern
California through New Mexico. Although the Basin will dry out
through the weekend, instability from the cut off low will be just
enough to allow mountain snow and rain showers to continue. Any
sort of break from the precipitation will be short lived with
another shortwave forming off the coast by the beginning of the
work week and will continue the wet pattern, along with mountain
snow showers at 5000 to 6000 feet.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  56  41  63 /   0   0  10  60
ALW  42  54  44  62 /  10  10  10  60
PSC  37  54  37  57 /  10  10  10  50
YKM  39  54  39  56 /  10  10  20  70
HRI  40  54  40  58 /   0   0  10  50
ELN  36  51  36  53 /  20  20  30  80
RDM  40  64  44  63 /   0   0  10  50
LGD  44  62  47  63 /   0   0   0  60
GCD  43  66  47  66 /   0   0  10  60
DLS  45  56  45  57 /  10  10  40  90

&&

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

$$

SHORT TERM...95
LONG TERM....95
AVIATION...97