Hermiston, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

128
FXUS66 KPDT 222300
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
300 PM PST Sun Feb 22 2026


.DISCUSSION...

The windy conditions have panned out to be about what was
expected with widespread gusts to up to 50 mph in the Grande
Ronde and Northern Blues Foothills, although with a lack of
higher end 60 mph gusts. From that aspect, the High Wind
Headlines will be canceled balance of the day.

An Atmospheric River wrapping around the closed low at 48.75
and 134.31 late This Morning was analyzed by the GFS/EC as
spreading 200-300 kg/ms IVT with about 18-20mm IVW spreading to
the Lower Columbia Basin later Today and overnights. This
reflects in the HREF showing a sustained period of
orographic/weakly synoptic lifted precipitation cross the
Cascades, and lower elevations rains increasing to 70-80%
chances for most of the WA and OR Columbia Basin through the day
Monday. The SLRs are 10-12:1 in the highest elevations of the
Upper slopes of the WA Cascade crest, and largely above about
about 5,000ft and falling off rapidly to about 5-6-1 below that
level with snow levels around 4500 ft. Metro Road data also
shows warm melting conditions for I-90 though the daytime hours,
and road temps/sub road temps running between 24F and 42F
overnight, which should limit travel impacts. Still with
persistent moisture availability, the highest elevation should
rack up snow accums through Tuesday, tapering off completely on
Wednesday. The Winter weather advisory across the Upper Slopes
was extended into Monday afternoon, although highest impacts
would probably occur during the overnights given the
aforementioned road conditions and overall lack of cold
advection.

Drier and increasingly uncertain temperatures are anticipated
heading into the middle and latter half of the week. The
clusters show development of a general zonal westerly flow with
gradually diminishing 500 mb heights and 1000-500 mb thickness
Wednesday through Friday in a dry low land pattern but high
mountain snow showers pattern.

&&

.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...

VFR conditions continue across the region late this
afternoon.  During the evening/overnight hours rain is expected to
move into DLS/PDT/ALW/YKM.  Additionally, there could be some MVFR
conditions, especially for DLS and PDT.

Winds will mainly be 10 kts or less. However, BDN and RDM will
continue to gust to around 25 kts.  PDT, ALW and PSC will have some
gusts in the 10 to 20 kt range through early evening before
decreasing to 10 kts or less.


&&

.Preliminary Point Temps/PoPs...
PDT  40  55  40  48 /  50  80  90  90
ALW  41  53  41  48 /  60  90  90  90
PSC  37  54  39  50 /  70  80  70  70
YKM  35  47  35  46 /  80  80  70  60
HRI  38  54  40  49 /  60  80  80  80
ELN  32  42  30  41 /  80  80  50  60
RDM  36  53  37  49 /  60  60  90  80
LGD  38  50  38  48 /  40  70 100  90
GCD  38  52  39  50 /  20  40  90 100
DLS  38  47  40  48 /  90  90  90  80

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
WA...Winter Weather Advisory until 1 PM PST Monday for WAZ522.
OR...None.

&&

$$

DISCUSSION...71
AVIATION...77