940
FXUS66 KPDT 171956
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1256 PM PDT Tue Jun 17 2025

.SHORT TERM...Today through Friday morning...Current satellite and
radar depict clear weather conditions for the area, with a few
high clouds over the Tri-Cities and to the area just north of it.
Not anticipating this dry pattern to change for the next couple
of days. Our only chance (45-65% chance) of some precip in the
short term will be in the Central WA Cascade region Wed AM through
the afternoon, as a cut-off low just off the Gulf of Alaska moves
into the PacNW. As that system makes its way into the region, both
pressure gradient and temperature gradient will become more
compact, causing gusty winds across the Cascade gaps and near the
Kittitas Valley. NBM advertises 55-65% chances, with some very
locally >85% spots, of wind advisory criteria gusts. Not enough
confidence to show this will come into fruition and/or spread
through enough coverage area to warrant an advisory at this time.
Will continue to monitor as winds will be breezy to locally windy
throughout the next couple of days.


.LONG TERM...Friday morning through Tuesday...For the long run,
the trough that continues to push SW flow into the region from
earlier will define the active weather pattern ahead. First, min
RH values will greatly recover by the end of this week, reducing
Red Flag Warning threats for the second half of this week. Min
RH`s currently stand in the mid to high end teens but by the end
of the week, they should rise to the 30s to 40s percentage wise.
This is again thanks in due to the pure SW flow from the incoming
system bringing in some maritime air, temporarily relieving the
region of dry air. Heading into the weekend, members are pretty
clear that the region will be impacted by widespread light rain
with the oncoming system (>85% chance). The models start to have
slight disagreements how they would conclude the system by the end
of the period. EURO ensembles suggest the cut-off low will
continue to push to the NE into Canada, becoming more broad while
barely maintaining its cut-off features while the GFS ensembles
will transition the system into a more broad wave. Temperatures at
this point depends on which solution reality more favors, with
the EURO (GFS) solution favoring a cooler (warmer) forecast.


&&

.AVIATION...18Z TAFs...Conditions are forecasted to remain in VFR
for the entire period for every site. The only concern for this
period, and what we will have to look out for, is the locally
breezy to windy conditions that will impact some areas over the
next 24 hours. A weak weather system will continue its influence
on the pattern, bringing gusts up to 25 knots at PDT/DLS for the
majority of the period. RDM/BDN will see their winds increase up
to 20 knots by 00z today. Otherwise, CIGs and VIS remain elevated
to VFR and no precip is anticipated at this time.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  54  84  50  78 /   0   0   0   0
ALW  59  84  53  78 /   0   0   0   0
PSC  55  87  50  81 /   0   0   0   0
YKM  54  83  49  82 /   0   0   0   0
HRI  56  86  50  80 /   0   0   0   0
ELN  53  78  48  78 /   0   0   0   0
RDM  43  81  39  75 /   0   0   0   0
LGD  50  84  48  77 /   0   0   0   0
GCD  48  88  46  80 /   0   0   0   0
DLS  57  77  51  78 /   0   0   0   0

&&

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

$$

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