255
FXUS66 KPDT 052218
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
318 PM PDT Fri Jun 5 2026

.KEY MESSAGES...

- Showers and isolated thunderstorms along the Cascade crest
  Saturday.

- Breezy winds in the lower elevations through Sunday.

- Another system will bring additional shower and thunderstorm
  chances Monday through Wednesday.

&&

.DISCUSSION...
An upper low and trough was moving onshore and will bring shower
and low thunderstorm (<20 percent) chances mainly to the Cascade
crest on Saturday. The trough will move east of the area on
Sunday and weak ridging will move in later Sunday. Expect most
of Sunday to be dry.

Another upper low and trough will then move towards the area on
Monday and cross the region on Tuesday before departing on
Wednesday. Dry weather looks to be in store for the remainder of
the week.

As the trough moves through into Sunday, there will be gusty
winds in the 25 to 35 mph range both this afternoon and evening
and Saturday afternoon and evening. On Sunday, there will still
be gusty winds but a bit lower, likely on in the 20 to 30 mph
range. NBM probabilities of wind gusts >= 39 mph on Saturday are
50 to 80 percent across the Simcoe Highlands and portions of
the Columbia Basin and Cascade Gaps.

Another round of gusty winds develops on Tuesday with the next
trough and continue into Wednesday. NBM probabilities of wind
gusts >= 39 mph is 40 to 80 percent on Tuesday and 30 to 70
percent on Wednesday across the Kittitas Valley, Simcoe
Highlands, Cascade Caps and Columbia Basin.

&&

.AVIATION /00Z TAFS THROUGH 00Z SUNDAY/...
Breezy conditions (sustained winds of 10-20 kts with higher
gusts) are forecast this afternoon and evening at all sites
prior to slackening overnight.

VFR CIGs are currently forecast at all sites. However, should
note the 12Z HREF suggests a low-medium (30-50 percent) chance
of MVFR CIGs overnight into Saturday morning at RDM/BDN with
lower chances (20 percent or less) at PDT/ALW/YKM/DLS.

Shower chances are very low (10 percent or less) for all sites
through the period, except at DLS/YKM Saturday afternoon where a
PROB30 has been included.

&&

.FIRE WEATHER...
With gusty winds through Sunday fire weather concerns will
remain elevated through the weekend mainly for the Oregon
Columbia Gorge and Simcoe Highlands. RH values will decrease on
Sunday, but winds will too, though they will remain gusty, in
the 20 to 30 mph range.

By midweek, RH values may tick up a bit as the next period of
gusty winds move in to the Simcoe Highlands, Columbia Basin,
Simcoe Highlands and Kittitas Valley. Wind Gusts of 25 to 35
mph and possibly to 40 mph could occur. MIN RH values will
generally be 30 to 45 percent, though there will be some
locations in the lowest elevations 20 to 30 percent.

&&

.Preliminary Point Temps/PoPs...
PDT  44  66  41  70 /   0   0   0   0
ALW  50  67  45  70 /   0   0  10   0
PSC  47  71  42  74 /   0   0   0   0
YKM  43  68  40  74 /   0  20  10   0
HRI  46  69  41  73 /   0   0   0   0
ELN  38  59  36  66 /   0  40  10   0
RDM  37  62  29  69 /   0   0  10   0
LGD  44  63  38  66 /   0   0  10   0
GCD  41  64  36  67 /   0   0  20   0
DLS  48  66  43  72 /  10  30  10   0

&&

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

&&

$$

DISCUSSION...77
AVIATION...86
FIRE WEATHER...77