877
FXUS66 KPDT 270943
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
243 AM PDT Mon Jul 27 2026

.KEY MESSAGES...

- Diurnal breezes expected much of this week, with Tuesday and
  Saturday being the windiest days.

- Quiet weather for the upcoming week.

&&

.DISCUSSION...
Dry southwesterly flow will continue over the Pacific northwest
around the periphery of high pressure over the mid section of
the country. A weak frontal boundary will move through on
Tuesday. The high will move westward toward the four corners by
the end of the week, coupled with low pressure moving into
western Canada, will allow for the flow to become more westerly.


There is little expected in the way of sensible weather this
week.

Diurnal breezes are expected almost every day, with Tuesday and
Saturday being the windiest days. A weak front on Tuesday will
bring an increase in winds, mainly across the Cascade gaps,
Columbia Basin, Gorge and Kittitas Valley. Winds will gust in
the 25 to 30 mph range in these areas. Probabilities are 50 to
>90 percent in these area of wind gusts >=25 mph, however
probabilities decrease to only a few spots >=50 percent for
wind gusts >=39 mph.

However, humidities will also be a bit higher ahead of the
front before coming back down behind it.

The rest of the week looks to have lighter winds until
Saturday, when the combination of the high pressure moving
westward and low pressure moving into Canada will tighten the
pressure gradient. Additionally there will be another frontal
boundary moving through. All of these combined will increase
winds across the normally breezier locations to 25 to 25 mph,
with some locally higher gusts. NBM probabilities of wind gusts
>=25 mph are above 80 percent across almost all of out region.

NBM probabilities of wind gusts >=39 mph are >=50 percent across
the Basin, Gorge Kittitas Valley, Foothills of the Blue
Mountains and Simcoe Highlands. Depending on timing, this could
be the next time frame of critical fire weather conditions.

&&

.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
VFR conditions are expected through the TAF period. However
smoke form region wildfires could decrease CIGS/VSBYS at
virtually any site. Winds will gust 20 to 25 kts at DLS, RDM and
BDN this afternoon and evening before decreasing this evening.
All other sites should remain 10 kts or less.

&&

.Preliminary Point Temps/PoPs...
PDT  88  57  87  55 /   0   0   0   0
ALW  90  63  89  60 /   0   0   0   0
PSC  92  61  91  58 /   0   0   0   0
YKM  91  59  89  56 /   0   0   0   0
HRI  91  61  89  58 /   0   0   0   0
ELN  84  56  81  52 /   0   0   0   0
RDM  88  50  87  49 /   0   0   0   0
LGD  90  56  89  55 /   0   0   0   0
GCD  92  54  92  54 /   0   0   0   0
DLS  88  62  84  59 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
WA...Air Quality Alert until 11 AM PDT this morning for WAZ028>030.
OR...Air Quality Alert until noon PDT today for ORZ049-050-502-503-
     505-506-508-509-511.

&&

$$

DISCUSSION...77
AVIATION...77