Hermiston, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

835
FXUS66 KPDT 251143
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
443 AM PDT Wed Mar 25 2026

.KEY MESSAGES...
- Light snow and rain showers continue in the mountain regions
  today. Drying conditions develop Thursday morning through the
  weekend.

- Hydrologic concerns continue through the next several days,
  with `Minor` flooding at a few spots in the Naches and Yakima
  Rivers.

- Breezy to locally windy conditions develop through the Simcoe
  Highlands and parts of the Columbia Basin Wednesday.

&&

.DISCUSSION...
Showers that lingered over the Foothills of the Blues have
since moved away from the area and dried out. Dry conditions for
the Columbia Basin and other low elevation areas will continue
through the weekend. Areas across the crests and higher elevated
mountainous regions will continue to see light precipitation
through the night before drying out by Thursday morning. Tight
pressure gradients developing over the region will make way for
breezy to locally windy conditions to develop by the late
morning to early afternoon hours. Forecast points to winds being
slightly stronger than yesterday, but not quite reaching
advisory level. Widespread 15-25 knots gusts will prevail, with
localized areas reaching 20-30 knots. By the evening hours,
winds will decrease to about 10-20 knots.

Afterwards, ridging will dominant the pattern going through the
weekend, making way for a dry and warmer trend to emerge. Highs
will reach the mid to upper 60s in the lower elevation areas
(60-80% chance). By early next week, deterministic models re-
enters a wetter, cooler pattern with a trough emerging on-shore.
This system will be a more rain dominated feature at first with
snow levels at around 4500 to 5500 feet. Current NBM guidance
has snow levels dropping down to 3000 to 4500 feet, bringing
light to moderate snow rates in the Cascade and Blue Mountains.

&&

.AVIATION /12Z TAFS THROUGH 12Z THURSDAY/...
VFR conditions prevail with mostly dry weather. Main concern
will be winds at all sites as breezy to locally windy
conditions develop in the late morning into the early afternoon.
Winds will reach as high as 25-35 knots, with winds diminishing
to 10-20 knots by the early to mid evening hours. Otherwise,
CIGs and VIS remain high enough to not cause concern for sub-VFR
levels.

&&

.HYDROLOGY...
Hydrologic concerns prevail at parts of the Naches and Yakima
Rivers. Main concerns will be Yakima River at Easton and Umtanum
& Naches near Naches. River levels are forecasted to briefly
reach `Minor` flooding at Umtanum late this afternoon. Easton
and Naches are expected to remain in `Minor` flooding through
Thursday and remain in `Action` afterwards for the next several
days.

&&

.Preliminary Point Temps/PoPs...
PDT  55  29  53  29 /  40  10   0   0
ALW  57  33  52  32 /  50  20   0   0
PSC  62  33  58  29 /  10  10   0   0
YKM  57  28  54  29 /  10  10   0   0
HRI  60  31  56  29 /  10  10   0   0
ELN  49  27  49  27 /  30  10   0   0
RDM  55  20  53  24 /  10  10   0   0
LGD  54  27  49  27 /  70  30   0   0
GCD  59  26  51  28 /  40  10   0   0
DLS  57  34  59  32 /  50  20   0   0

&&

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

&&

$$

DISCUSSION...95
AVIATION...95
HYDROLOGY...95