Naches, Washington Weather Forecast Discussion

215
FXUS66 KPDT 091733
AFDPDT
Area Forecast Discussion
National Weather Service Pendleton OR
1033 AM PDT Tue Sep 9 2025
.UPDATED AVIATION.
.AVIATION...18Z TAFs...Showers and storms are popping up across
the region. Not too confident about direct hits with airways, but
have put in VCSH for YKM/BDN/RDM. Have also entered PROB30 for the
airways across the Columbia Basin in the overnight hours. Winds
will be light except for areas near strong storms that could
produce erratic wind gusts.
&&
PREV DISCUSSION... /issued 134 PM PDT Mon Sep 8 2025/
DISCUSSION...
An upper low, currently off the coast of northern California and
southern Oregon will move onshore tonight into early Tuesday. This
low and trough associated with it remain over the western states
through much of the upcoming week before moving eastward Friday
night into Saturday. Transient ridging will move over the area for
Saturday before another trough possibly impacts the region early
next week.
With the upper low and trough, conditions look to be unsettled for
much of the week. Thunderstorm chances are highest today through
Wednesday, with highest chances today over central Oregon then
across the higher elevations of central and eastern Oregon
Tuesday and then the chances shift east on Wednesday to mainly
eastern Oregon. However, by Wednesday, overall POPS increase as
well with some areas seeing likely or higher chances.
QPF values are fairly low today and Tuesday, mainly due to the
nature of thunderstorms. However, by Wednesday, rain becomes more
widespread and amounts, especially for the higher terrain from
central Oregon to eastern Oregon will increase. Some of these
areas will see QPF between 0.50 to 1.00 inch.
THE ECMWF EFI does focus in on some anomalous QPF values on
Tuesday, in central Oregon, with values in the 0.7 to 0.8 range
and on Wednesday the 0.7 to 0.8 range is a bit more widespread.
High temperatures will be around or slightly below normal through
the week.
&&
.PRELIMINARY POINT TEMPS/POPS...
PDT  57  79  57  74 /  40  40  70  70
ALW  61  81  62  75 /  30  30  60  70
PSC  58  83  59  79 /  20  20  40  50
YKM  57  84  58  83 /  20  30  20  30
HRI  59  82  59  78 /  30  40  50  60
ELN  53  83  56  80 /  30  30  20  30
RDM  48  71  49  72 /  50  60  60  50
LGD  51  78  54  70 /  40  50  80  80
GCD  50  72  53  68 /  40  70  80  70
DLS  60  81  62  78 /  30  40  30  40
&&
.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&
$$
SHORT TERM...77
LONG TERM....77
AVIATION...95

NWS PDT Office Area Forecast Discussion