899
FXUS66 KPDT 301021
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
321 AM PDT Tue Jun 30 2026

.KEY MESSAGES...

- Below normal temperatures with breezy conditions through
  Wednesday.

- Warmer temperatures and dry weather Thursday through the
  holiday weekend.

&&

.DISCUSSION...
The upper level trough that has been over the Western CONUS
will gradually weaken and the flow will become more zonal by
Friday and more southwesterly by the weekend. Will need to keep
an eye on the southwesterly flow or any shortwaves but right now
it appears to be a dry holiday weekend.

In the near term, some shortwave energy today will bring rain
chances  mainly to Wallowa County and low (<20 percent) chance
of thunderstorms.

Winds will continue to be gusty today and Wednesday, especially
in the Kittitas Valley, Simcoe Highlands and potions of the
Columbia Gorge and north-central Oregon. Winds could gust in the
25 to 35 mph range with locally higher values.

The trough will begin to flatten and heights will rise and
temperatures will begin to rise towards normal by Thursday and
then into the lower 90s in the Columbia Basin over the weekend.
These values would be about 5 or so degrees above normal. As
temperatures warm, RH values will decrease to the 10 to 15
percent range in many areas over the weekend, but winds should
be relatively light by this point.

There is considerable disagreement as we get toward the end of
the period and beyond as to the extend of the ridge building in.
Some guidance suggests we will have the typical summer ridge and
a return to heat, while other guidance is not so bullish on
that. We will have to see how this plays out in the early to mid
July timeframe.

&&

.AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/...
VFR conditions are expected through the TAF period. Winds will
gust 20 to 25 kts at most sites before decreasing this
afternoon/evening and 25 to 30 kts at DLS.

&&

.Preliminary Point Temps/PoPs...
PDT  75  44  75  46 /  10   0   0   0
ALW  77  51  77  52 /  10   0   0   0
PSC  81  49  80  50 /  10   0   0   0
YKM  82  49  81  50 /   0   0   0   0
HRI  78  47  78  49 /   0   0   0   0
ELN  73  45  74  46 /   0   0   0   0
RDM  73  34  74  38 /   0   0   0   0
LGD  74  42  76  44 /  10   0   0   0
GCD  76  39  77  42 /   0   0   0   0
DLS  72  50  73  51 /   0   0   0   0

&&

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

&&

$$

DISCUSSION...77
AVIATION...77
FIRE WEATHER...75