363
FXUS66 KPDT 051019
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
319 AM PDT Fri Jun 5 2026

.KEY MESSAGES...

- Showers and isolated thunderstorms along the Cascade crest
  Today and Saturday

- Breezy winds over the lower elevations Today and Saturday


- Dry conditions Sunday before an active weather pattern returns
  through the middle of next week


&&

.DISCUSSION...

Diffluent flow aloft was in place across Washington and Oregon
ahead of a 540 dm upper low near 52N and 135W. This upper low is
forecast to pivot southeast reaching the the PAC NW coast on
Friday Night. And spreading inland an shearing out as an
amplified through through Saturday Night. This will bring
sensible weather including winds, rains, potentially
thunderstorms and wetting rains to the higher mountain zones.

As for Today, there is a short duration from mid afternoon
through about 6 or 7 pm for potential (up to 60% chances) for
low end advisory level sustained wind speeds of 30 mph and gusts
around 40 mph between The Dalles and Goldendale, in the Eastern
Columbia River Gorge.

Dry conditions will begin to give way to by late Today across
the Washington Cascade crest and the Oregon crest through
Saturday- Morning. This upper low does not develop far enough
south to bring wetting rains to the eastern Mountains, leaving
them virtually dry as Cascade showers end Saturday afternoon.
Sunday will remain dry, as a shortwave ridge shifts across the
area in a progressive pattern that sets up another upper cold
core low to spread , farther south this time, across the
Interior NW late Monday through Tuesday afternoon. This second
upper low, with its farther southward track has a greater
probability for spreading rains, even wetting rains across the
eastern mountains Monday into Tuesday. Slightly cooler
temperatures due to the weather system in the weekend and early
next week, characterized by mean NBM high temps in the low to
mid 70s across the Columbia Basin/River Gorge and Yakima
Valleys, to upper 60s in the Kittitas valley and central Oregon,
and mid much cooler 50s in most of the mountain zones.
Russell/71


&&

.AVIATION /12Z TAFS THROUGH 12Z SATURDAY/...

No ceilings to deal with during this TAF period as a dry
diffluent flow aloft is in place with only high level mountains
showers later Tonight. Winds will get windy however in the
Columbia River Gorge around KDLS, where afternoons sustained
speeds near 30 mph and gusts to around 40 mph have about a 50%
chance of occurrence form around 20z to 01z. Russell/71



&&

.FIRE WEATHER...

Dry and Breezy conditions will overlap This Afternoon across
the Eastern Columbia Gorge and Oregon Columbia Basin where
combined probability for RH and wind speeds of 20% or less and
15 mph respectively area around 40 to 60%. Fuels are not quite
cured enough for red flag concerns in these zones, yet. Farther
north over the Washington Columbia Basin where fuels have cured
more, combined probabilities on Friday for these rh and winds
are around 5-25%. Russell/71


&&

.Preliminary Point Temps/PoPs...
PDT  72  44  66  41 /   0   0   0   0
ALW  74  50  67  45 /   0   0   0   0
PSC  77  48  71  42 /   0   0   0   0
YKM  74  44  68  40 /   0   0  20   0
HRI  74  46  69  41 /   0   0   0   0
ELN  66  39  60  36 /   0   0  40   0
RDM  73  38  62  29 /   0   0   0   0
LGD  74  43  63  38 /   0   0   0  10
GCD  79  41  64  36 /   0   0   0  10
DLS  71  49  66  44 /   0  10  30  10

&&

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

&&

$$

DISCUSSION...71
AVIATION...71
FIRE WEATHER...71