Mitchell, Oregon Weather Forecast Discussion

695
FXUS66 KPDT 230841
AFDPDT
Area Forecast Discussion
National Weather Service Pendleton OR
141 AM PDT Tue Sep 23 2025
.DISCUSSION...Quiet weather pattern continues as a high pressure
ridge remains centered over the PacNW. Only thing to really note
from this pattern is the development of a thermal trough along the
foothills of the Cascades, which will coincide with low RHs in the
lower teens across central Oregon. But in the absence of breezy
winds under this ridge pattern, and with wildfire activity in the
area minimal, not expecting critical conditions to materialize
either today or tomorrow. Temps under this ridge will peak on
Wednesday, with highs well into the 80s, possibly 90 in central
Oregon and the Gorge (confidence 20-30%) due to the aforementioned
thermal trough.
Models have backed off on any kind of moisture surge across the
Washington Cascades heading into the weekend, even as an oncoming
shortwave looks to flatten this ridge. Moisture looks to fall well
to our north and west, so the only impact from this wave would be
an uptick in winds through primarily the Cascade Gaps Thursday and
Friday, but again, critical conditions are not anticipated, as
RHs will increase as cooler air behind this wave filters in.
Ensembles continue to favor a weak SW flow pattern heading into
next week, but until then, sensible weather impacts will remain
relatively limited. Evans/74
&&
.AVIATION...06Z TAFs (Previous Discussion)...VFR conditions with
light winds are expected through the TAF period. The only
potential caveat is smoke from regional wildfires which could
bring lower conditions across the area. However, at this time, the
probabilities are low (

NWS PDT Office Area Forecast Discussion