242
FXUS66 KPDT 021005
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
305 AM PDT Sat May 2 2026

.KEY MESSAGES...

- Dry with above normal temperatures through much of next week.

- Low chances for showers and thunderstorms, mainly for the
  Oregon Cascades today and Sunday.


&&

.DISCUSSION...
An area of low pressure was situated off the Washington and
Oregon coasts. This low will move south through the weekend and
will be off the California coast by early Sunday. It will then
turn eastward and move onshore in central California. From
there, the low will weaken into an open trough and the trough
will move through the southern Great Basin early in the week.

A large ridge of high pressure will build over the Pacific
Northwest behind the departing trough for much of next week.
This high will bring dry and unseasonably warm temperatures to
the region. By Friday, a weak trough may move into the
northwest. This could bring some slightly cooler temperatures
and perhaps some showers to the mountains, but confidence is low
(30%) at this time as not all of the guidance has this trough
and due to the fact that it is still 6 days away, the exact
details will likely change.

As the low off the coast moves by off the coast, the area will
be in south to southwest flow today. with a couple of shortwaves
in the flow there will likely be some showers over mainly the
Oregon Cascades and there could be enough to trigger a few
thunderstorms. Latest radar coverage still has some showers
hanging on across the Cascades deep into the night, due to some
lingering instability. Shower and thunderstorm chances continue
into Sunday, but should mainly be confined to central Oregon
and southern Oregon, due to the low being further south and
moving away. Its possible there are a few remaining showers and
thunderstorms along the Cascade crest in central Oregon on
Monday, but chances should be decreasing with time.

After that, it is just dry and warm for the balance of the week.
By Monday, high temperatures will be in the 80s in many low
elevation areas with the Columbia Basin and Yakima Valley in the
mid to upper 80s, and 90 degrees is not out of the question.
These temperatures are 15 to 20 degrees above normal. NBM
probabilities of maximum temperatures >= 90 degrees on Monday
across the Columbia Basin are 20 to 30 percent which is a bit
lower than yesterday. However by Wednesday those numbers wise
to around 50 percent.

&&

.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
VFR conditions are expected through Sunday. Winds will mainly
be 10 kts or less, except at DLS where there are some gusty
winds in the 25 to 30 kt range this morning, possibly due to
some nearby SHRA. These should subside later this morning, then
all sites will be 10 kts or less through the period.

&&

.Preliminary Point Temps/PoPs...
PDT  82  51  83  52 /   0   0   0   0
ALW  82  55  83  56 /   0   0   0   0
PSC  87  52  88  52 /   0   0   0   0
YKM  84  53  86  55 /   0  10   0   0
HRI  84  51  87  52 /   0   0   0   0
ELN  79  49  82  51 /  10  10   0   0
RDM  79  43  82  44 /  10  10   0   0
LGD  77  47  80  48 /   0   0  10   0
GCD  79  47  80  46 /   0   0  10  10
DLS  84  56  88  58 /  10   0   0   0

&&

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

&&

$$

DISCUSSION...77
AVIATION...77