192
FXUS66 KPDT 040515
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1015 PM PDT Wed Jun 3 2026

.KEY MESSAGES...

- Light showers continue through this afternoon with isolated
  storms possibly developing today.

- Breezy winds developing in the Simcoe Highlands and Kittitas
  Valley today, with winds peaking Friday.

- Cooling trend through Saturday, warming early next week.

&&

.DISCUSSION...
Radar currently shows light showers across the
area that will continue through the rest of the afternoon hours.
Parts of the Southern Blue Mountains are seeing clearer
conditions than earlier this morning, allowing for daytime
heating to build into the area. This allows CAPE values to
develop in the 250-500 J/kg range with 30-35 knots of 0-6km
shear, bringing slight (10-20 percent) chances of an isolated
thunderstorm this afternoon. Not expecting any of these storms
to be severe, but heavy rain and pea size hail may impact areas
where the strongest storms are present.

An oncoming shortwave with an embedded cold front will push
through the area Thursday/Friday, allowing pressure gradients
to tighten and bring breezy to windy conditions across the
Simcoe Highlands, Kittitas Valley, and the Columbia Basin.
Higher winds are expected across the Simcoe Highlands and
Kittitas Valley (70-90% chance) though wind values appear to be
sub-advisory level with more common values of wind gusts staying
at 25 to 35 mph (50-70% chance). NBM does advertise 50-70%
chances of exceeding wind advisory Friday, but confidence is
not great enough to warrant a wind advisory yet. The oncoming
trough will bring moderate rain and snow showers across the
Cascades Friday and Saturday, but will leave most of the area
east of it dry due to rain shadowing. Dew points and relative
humidity will remain dry and, with combination of the expected
breezy conditions Friday, bring elevated fire weather concerns
through parts of the Columbia Basin (see `FIRE WEATHER` below).
Temperatures will cool down to the mid 60s to low 70s in lower
elevation areas as a result of the systems passage. By Sunday,
highs will hover in the mid to high 70s and be stable through at
least through mid-next week (40-60% chance).

&&

.AVIATION /06Z TAFS THROUGH 06Z FRIDAY/...VFR conditions to
prevail through the period. Breezy winds (12-20kts with gusts to
around 28kts) at site PDT will continue over the next couple of
hours, then will be 12kts or less through the remainder of the
period. Site DLS will see light winds tonight, then winds will
increase to 12-20kts with gusts to around 30kts after 14Z.
Otherwise, winds will be 12kts or less and diurnally driven at
all other sites. Lawhorn/82


&&

.FIRE WEATHER...
Elevated fire weather concerns expected this
Friday across parts of FWZ WA691 (Columbia Basin of Washington).
Concerns arise with the combination of breezy to windy and low
relative humidity conditions developing. Minimum relative
humidities will dry out in the 20-25% range Thursday and Friday.
Breezy wind gusts will develop Friday in combination with the
low relative humidity values, resulting in the potential for
elevated fire weather potential.

&&

.Preliminary Point Temps/PoPs...
PDT  47  75  47  72 /  10   0   0   0
ALW  53  76  52  74 /  10   0   0   0
PSC  52  80  50  77 /   0   0   0   0
YKM  48  80  47  74 /  10   0   0   0
HRI  50  78  50  74 /   0   0   0   0
ELN  45  71  44  66 /   0   0   0   0
RDM  37  76  39  73 /   0   0   0   0
LGD  44  74  43  75 /  20   0   0   0
GCD  42  77  42  80 /   0   0   0   0
DLS  53  77  52  71 /   0   0   0   0

&&

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

&&

$$

DISCUSSION...95
AVIATION...82
FIRE WEATHER...95