578
FXUS66 KPDT 151128
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
328 AM PST Sat Nov 15 2025

.Updated for Aviation...


DISCUSSION...

Cross barrier flow continues bringing lift across the Washington
Cascades this morning as a slug of mid level warm advection
across the Interior Northwest is lagged by a 925-850 mb moisture
transport signal west of the mountains. Composite radar is showing
the PDT area dry while thicker mid level clouds were moving across
the WA portion for the Columbia Basin. Light to breezy southwest
surface winds overnight will wane Today as high pressure
ridging/subsidence leads to lighter and more variable surface
winds. The warmest temperatures of the week are expected this
afternoon, as the Columbia Basin reaches the low to mid 60s.

The next piece of IVT (rather weak based on GFS/ECMWF) brushes
the Pac NW Sunday through Sunday night, spreading rain chances
across the entire area. Best rain chances (60-80%) across the
Kittitas valley and points nw of Ellensburg as will as the
Cascades Crest as well as the eastern mountains. A muted repeat on
Monday is possible (50-70%), again only in the higher elevations.
Temperatures will moderate into the low 50s over the Columbia
Basin Sunday and Monday afternoons. Rain chances will continue
though the week in the highest elevations of the cascades (20-30%)
with a more notable wet period possibly returning by Wednesday
and Wednesday night as low land areas see precipitation
probabilities increase to 45-60% per the NBM mean. The
opportunity for widespread hazardous weather is low through the
next 7 days.

AVIATION...12Z TAFS...VFR conditions are expected through the day
today and at most sites tonight. However, as some ridging builds
over the area, there is a chance of MVFR conditions at DLS and
YKM (and can`t be ruled out elsewhere) late tonight and Sunday
morning. Otherwise winds will mainly be 10 kts or less. PSC has
had some gusty winds this morning. THose are likely to decrease
over the next couple of hours and they will be 10 kts or less
through the remainder of the period as well.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  63  40  54  42 /  10  10  40  70
ALW  62  44  53  46 /  30  10  50  80
PSC  64  40  55  43 /  10  10  20  40
YKM  63  43  58  42 /  10  20  20  30
HRI  63  40  54  44 /  10  10  30  50
ELN  58  41  54  40 /  20  30  30  50
RDM  60  33  57  36 /   0   0  20  50
LGD  58  38  55  42 /  20  10  70  90
GCD  60  39  55  41 /   0  10  70  80
DLS  61  45  57  47 /  30  10  30  70

&&

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

$$

SHORT TERM...71
LONG TERM....71
AVIATION...77