Hermiston, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

025
FXUS66 KPDT 261135
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
435 AM PDT Tue May 26 2026

.KEY MESSAGES...

- Shower and thunderstorm chances increase Thursday.

- Slight drier conditions tomorrow.

- Drier conditions towards the end of the week.

&&

.DISCUSSION...
Radar shows light to moderate showers continuing to pour out in
the Wallowas, which is expected to continue through the rest of
the overnight hours. The associated trough that brought
unsettled weather will continue to push south, leaving the low
pressure system to bring wrap-around that will mostly effect the
southern portions of the CWA (that include Central Oregon
through the John Day Highlands) through tomorrow and tomorrow
night.

Wednesday will become mostly clearer and drier thanks to a
building ridge across the PacNW, which will allow day time
heating to build-up over the next two days. High temperatures
will build up to the mid 80s to low 90s by Thursday (70-80%
chance). HeatRisk with a value of "1" (effecting the most
sensitive to heat risks) will cover a large portion of the
region on Wednesday and increase to "2" in parts of the
Washington Basin on Thursday. Later on Thursday, the precluded
daytime heating build-up with some lifting mechanism from a
shortwave will bring potential thunderstorm threats across the
region. Modeled Skew-T`s show the potential for values of 1000
J/kg+ of CAPE to develop. Thunderstorm strength potential will
be limited with a cap preventing storms for taking potential of
the full energy. If the cap is broken, then storms could
strengthen further. Will need to keep an eye on trends as far as
short term models suggest.

Heading towards the weekend, clusters generally agree that we
will head towards a drier pattern with light to moderate precip
at times but generally less so than today and the next few days
will be.

&&

.AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/...
Although VFR conditions are expected to prevail through the
next 24-hours... light to moderate showers are expected to
continue through most of the TAF sites. Winds will taper off to
10-20 mph with occasional higher gusts in DLS/RDM/BDN
(especially in the late morning to afternoon hours). A small
chance (5-15% chance) of temporary VFR conditions is possible if
heavier showers develop over TAF sites, reducing visibility and
cloud decks.

&&

.Preliminary Point Temps/PoPs...
PDT  61  45  77  51 /  50  60   0   0
ALW  63  49  79  56 /  50  60   0  10
PSC  69  47  84  54 /  20  40   0   0
YKM  71  50  87  57 /   0  10   0   0
HRI  66  46  81  54 /  30  50   0   0
ELN  65  46  82  55 /  10  10   0   0
RDM  59  37  75  44 /  20  70  20  30
LGD  55  44  77  49 /  80  80  10  20
GCD  53  39  76  44 /  90  90  30  30
DLS  70  52  84  58 /  10  10  10   0

&&

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

&&

$$

DISCUSSION...95
AVIATION...95