Hermiston, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

116
FXUS66 KPDT 042337
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
437 PM PDT Mon Aug 4 2025

.UPDATED AVIATION DISCUSSION...

.AVIATION...00Z TAFs...VFR conditions throughout the TAF period for
all sites. KDLS will have sustained winds of 12-20kts with gusts of
20-30kts into Tuesday early morning. Gusts will then decrease
between 12Z and 16Z before returning later Tuesday morning. KPDT
may join with KDLS Tuesday morning as well, though with mainly
breezy winds. Breezy winds will impact KRDM/KBDN up to 18kts
through this evening. Otherwise, the remaining sites will have
winds less than 12kts. Feaster/97

&&


.PREV DISCUSSION... /issued 141 PM PDT Mon Aug 4 2025/

.DISCUSSION...Current radar shows some cells over the region that
are putting down some precipitation. There are also a few
thunderstorms along the southern border of Grant County with some
lightning embedded as well as in Wallowa just southeast of
Enterprise and Joseph. Ground observations show that within the
last 3 hours, these cells/thunderstorms have put down 0.01-0.05
inches of precipitation with some higher elevation observations
showing 0.10-0.12 inches. Both wet and dry isolated thunderstorms
will continue through the evening.

Tuesday models are in decent agreement that the current system
will be off to the east leaving the region in primarily a
westerly flow aloft. This pattern will leave the majority of the
area free and clear of precipitation. Over 60% of the raw
ensembles show temperatures to remian in the low to upper 80s. EFI
shows each day to be below climatological normal and our
climatology information places the areas around the CWA between
1-5 degrees below normal along the lower elevations all the way
to 10-11 degrees below normal along some of the higher areas along
the Northern Blues and WA Cascades.

Late Tuesday night and through Thursday morning, models show a
shortwave making its way into the PacNW bringing increased
probabilities of mountain showers. EFI shows the QPF to be a bit
above seasonal normal and a few CAMs models show precipitation
totals be be between 0.10-0.20 along the eastern mountains and
Northern Blues as well as 0.05-0.15 along the WA Cascades.
Thursday afternoon models show the upper level low to be right
overhead with southwest flow bringing with it some warm air
advection. This will enhance the potential for convection over the
eastern mountains and Wallowa County with models showing 15-30%
probabilities. Long range models do show an increase in stability
with MUCAPE values increasing. As this is day 4, we will continue
monitoring.

Friday through Sunday models show the upper level low to be off
to the northwest with the leading edge of an upper level ridge
making its way into the PacNW. However, clusters are having
trouble digesting the timing of the exit of the low and the
entrance of the ridge so confidence is a bit low at this point on
when the ridge will be over the area. Regardless, all models are
pointing to an uptick in temperatures and dry conditions. So far
50-70% of the raw ensembles show temperatures to be over 90
degrees by Saturday. Bennese/90


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  56  86  60  81 /   0   0   0  10
ALW  60  86  64  81 /   0   0   0  20
PSC  57  89  61  82 /   0   0   0  10
YKM  59  87  62  82 /   0   0  10  30
HRI  59  89  63  83 /   0   0   0  10
ELN  57  83  59  77 /   0   0  10  30
RDM  46  83  51  80 /   0   0   0  10
LGD  51  85  55  80 /  10   0   0  10
GCD  51  86  53  82 /   0   0   0   0
DLS  60  84  65  79 /   0   0  10  30

&&

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

$$

SHORT TERM...90
LONG TERM....90
AVIATION...97