Pendleton, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

287
FXUS66 KPDT 112319
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
419 PM PDT Sat Apr 11 2026

.KEY MESSAGES...
- Shower and thunderstorm chances continue today, and decreased
  chances on Sunday.

- Another system will bring precipitation back to the region
  later Tuesday into Wednesday.

&&

.DISCUSSION...
An upper low was approaching northern California and will move
inland early Sunday morning. The low will then weaken and move
east northeastward through Monday as a broad upper trough
remains over the western CONUS. By later Monday, into Tuesday,
this trough will move eastward and weak ridging will move into
the area, followed by a more zonal westerly flow.

Guidance has continued to show that the best chances for
thunderstorms this afternoon and evening is along a diagonal
line from central Oregon through the Blue Mountain Foothills and
into eastern Oregon. Latest satellite imagery showed some
cumulus field development and a lot of clouds but also enough
breaks in the clouds for thunderstorms to develop. There is
certainly enough CAPE (200-500 J/kg) and supportive LIs
(-1 to -3 degrees Celsius). However, temperatures are cooler
than they were at this time yesterday and so far thunderstorms
have struggled.

Any thunderstorms should decrease this evening. On Sunday, both
the shower and more limited thunderstorm threat will move
eastward and mainly be confined to eastern portions of the
area.

Drying will move in from west to east on Monday and continue
into most of Tuesday.

By later Tuesday into Wednesday, an area of low pressure will
drop down from Canada and bring another chance of precipitation,
including the potential for late season snow to the mountains.
This next system looks to being over 0.75 inches of liquid
equivalent QPF to the mountain crests and at least some snow.
It is very difficult for snow to accumulate during the day this
time of the year, but certainly it can happen at night, but at
least several inches of snow is possible, and snow levels will
be below pass level. At lower elevations, generally 0.25 inches
of rain or less is expected.

Temperatures will average about 5 degrees below normal Wednesday
into Thursday, and there could be some below freezing mornings
especially in the colder valleys. NBM probabilities are as high
as 80-90 percent for lows <=32 degrees Thursday morning in the
Yakima and Kittitas Valleys.

Drier weather is then expected for the end of the week.

It will also be a bit breezy Tuesday and Wednesday mainly in the
normally breezy locations, with wind gusts of 30 to 35 mph, and
possibly as high as 40 mph. NBM probabilities of wind gusts
>=39 mph are between 60 and 80 percent, especially across
portions of the Columbia Basin and Foothills of the southern
Blue Mountains.

&&

.AVIATION /00Z TAFS THROUGH 00Z MONDAY/...
VFR conditions across all TAF sites through much of the period.
BDN/RDM will see a decrease to MVFR due to low CIGs moving in
after 14Z and PDT will see 6SM due to rain and BR after 18Z.
The threat of VCTS is still possible (20-30%) but will likely be
outside of the 5 mile mark. PDT/RDM will continue to see showers
today through the evening and even overnight.

&&

.Preliminary Point Temps/PoPs...
PDT  43  58  43  57 /  30  80  80  50
ALW  46  60  45  57 /  20  90  80  60
PSC  44  65  47  66 /  10  60  60  30
YKM  42  67  44  65 /  10  40  30  10
HRI  44  62  45  62 /  20  70  60  30
ELN  38  64  42  56 /  10  30  20  10
RDM  37  54  35  54 /  60  70  60  20
LGD  41  54  40  51 /  60  90  90  70
GCD  40  51  38  49 /  70  90  80  80
DLS  46  62  47  60 /  30  60  50  10

&&

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

&&

$$

DISCUSSION...77
AVIATION...90