903
FXUS66 KPDT 062029
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
129 PM PDT Mon Oct 6 2025

.DISCUSSION...Clear skies prevail across the PacNW this afternoon,
save for some patchy haze and smoke along the central WA Cascades as
area wildfires continue to burn. High pressure will otherwise make
for quiet weather through the midweek. Overnight lows will be chilly
once again, flirting with and even dropping below freezing across
our elevated valleys, but with many such areas seeing a season-
ending freeze last night (namely central Oregon, the John Day Basin,
Wallowa Valley, and Grande Ronde Valley), Freeze Warnings are not
anticipated. The Kittitas Valley in particular dropped below
freezing last night, and could once again tonight, however
confidence is low (20%) as temps will be higher during the day today
compared to yesterday. Did make mention of patchy frost in the area
overnight tonight, however.

Around Wednesday, high pressure will move out as a broad low
pressure system stemming from the Gulf of Alaska will drop down and
become nearly stationary just off the Pacific coast, making for
persistent PoPs across at least the Cascades and east slopes
Wednesday and Thursday. The low will retrograde slightly before
making its onshore push next weekend, making for more widespread
precip chances. Will this finally be what kills off the remaining
wildfires in the region? NBM does seem relatively confident (70-80%)
in QPF over half an inch for the Cascades, with areas over 5500 ft
potentially seeing some light snow as well with this low pulling in
colder air. NBM isn`t quite as confident in wetting rains across the
lower elevations (30-40%) through next weekend, but we are rapidly
approaching the time of year where all we need is a decent,
widespread wetting rain over a quarter of an inch to put an end to
wildfire season for the year.

Ensembles are in pretty good agreement on this low being the
dominant synoptic feature of the next week, only diverging early
next week once the low finally shifts out of the region. As a
result, expect a cloudy, cool, and wet forecast to dominate after
Tuesday as autumn really starts to settle in over the region.
Evans/74

&&

.AVIATION...18Z TAFs (Previous Discussion)...TAFs are generally
VFR for the most part with the only exclusion of some TEMPO haze
in YKM that has brought VIS down to MVFR. Will expect to move out
later on and remain VFR for the remainder of the period. Winds for
the most part are generally light and variable with clear skies
dominating.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  69  40  74  43 /   0   0   0   0
ALW  69  45  74  48 /   0   0   0   0
PSC  70  37  72  40 /   0   0   0   0
YKM  70  41  72  41 /   0   0   0   0
HRI  70  38  73  41 /   0   0   0   0
ELN  69  37  70  38 /   0   0   0   0
RDM  68  31  75  34 /   0   0   0   0
LGD  66  35  72  42 /   0   0   0   0
GCD  68  36  73  38 /   0   0   0   0
DLS  73  44  76  46 /   0   0   0   0

&&

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

$$

SHORT TERM...74
LONG TERM....74
AVIATION...95