420
FXUS66 KPDT 022332
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
332 PM PST Mon Nov 2 2026

.KEY MESSAGES...
- Increasing clouds resulting in warmer overnight temperatures
  Tonight

- Near-normal temperatures and mostly dry conditions until a
  weak weather system arrives late Wednesday.

&&

.DISCUSSION...
Visible satellite showed what little stratus was left after
several hours of insolation was across parts of the Grande Ronde
Valley. Farther southwest the split moisture windows showed
arcing high level cloudiness from NW to SE moving inland in
association with the more diffluent upper flow on the backside
of this current upper ridge over Eastern Washington and Eastern
Oregon.

Little to no weather risk is seen for the next few days. The
Eastern Columbia River Gorge has not received its season ending
freeze yet, and the chances are low at best with more cirrus
overspreading the area Tonight and NBM minimum temperatures in
the 25th to 75th percentiles falling in the 41 to 43 degree
range, a high degree of confidence for no freeze Tonight. Clouds
clearing the area Tuesday Night will leave slightly better
setup for near freezing temps, but till the NBM QMD range is
between 36 and 39 degrees from the NBM inputs.

Wind are generally light across the area, but the NBM is
picking up on elevated/breezy sustained winds and gusts across
the Grande Ronde Valley and the adjacent eastern mountains,
Tonight, through the overnight and early Tuesday. Here,
sustained south winds in the 20 mph area and gusts to around 30
mph should be common. Winds in this region will again pick up
(breezy) toward Thursday night and through the weekend when the
next weather system brings rain across the area. Probabilities
of precipitation ramp up Wednesday Night across the Cascades
Eastern Slopes with low pops over the lower elevations through
Thursday morning (20-50 percent chances for measurable rainfall)
. Lower confidence precipitation chances (20 to 30 percent)
over the eastern Mountains and (30 to 70 percent) across the
Washington Eastern Cascades slopes return Friday.

A cooler rainy period of the latter half of the week will
maintain 40s to 50s in the mountains to mid and upper 50s in
mountain valleys, central Oregon and the Columbia Basin. Drier
conditions by the weekend point to NBM mean warming to the 60s
across central Oregon and the John Day Basin.

&&

.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/...Inherited TAFs have
VFR conditions prevailing through the period. There is a 20%
chance that fog will develop in the Columbia Basin tonight,
leading to MVFR or lower conditions at sites ALW/PSC. Otherwise,
winds will be light through the period. Lawhorn/82


&&

.Preliminary Point Temps/PoPs...
PDT  36  50  30  54 /   0  10   0   0
ALW  39  50  34  53 /   0   0   0   0
PSC  38  54  31  56 /   0  10   0   0
YKM  39  57  31  56 /   0  10   0   0
HRI  38  52  30  55 /   0  10   0   0
ELN  34  52  28  53 /   0  10   0   0
RDM  31  51  23  57 /   0   0   0   0
LGD  37  56  31  58 /   0   0   0   0
GCD  36  58  31  58 /   0   0   0   0
DLS  41  58  35  58 /  10  10   0   0

&&

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

&&

$$

DISCUSSION...71
AVIATION...71/82