862
FXUS66 KPDT 092301
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
401 PM PDT Sun Aug 9 2026


.Updated Aviation Discussion.


.KEY MESSAGES...
1. Dry, warm and breezy conditions will persist through the weekend
   and beginning of the week

2. Pattern shift mid-week could bring precipitation

&&

.DISCUSSION...
Current satellite shows mostly clear skies with smoke lingering in
some areas around the wildfires. Smoke will continue to linger
through the period but with the increased winds, will not settle to
heavily at the surface.

Dry and warm conditions will persist through the week as westerly
flow aloft continues over the region. Westerly flow will continue
through the weekend and beginning of next week with temperatures
becoming slightly cooler. In house calculations shows much of the
region to still be above seasonal average at 5 to 10 for today
steadily decreasing to near 5 degrees above normal by Monday. As the
temperatures begin to decrease, relative humidity will begin to
increase. This will bring the area out of critical fire weather
conditions but will still remain elevated. Winds are expected to
remain 10 to 15 mph and gusting between 25 to 35 mph through at
least Tuesday with 70-80% of the NBM raw ensembles in agreement. .

Models are coming into slight agreement with a pattern change by mid-
week. Models are showing an upper level trough making its way into
the region with a Four Corners High set up to the south. This has
the potential to bring in some monsoonal moisture as well as some
instability. NBM model shows there to be chances (20-30%) for some
isolated showers across central OR and the eastern mountains. There
is also chances of isolated thunderstorms Friday afternoon. However,
with this being day six, confidence is rather low and we will
continue to monitor a the event draws near.

&&

.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
VFR conditions currently across most sites, with KYKM being the
only terminal experiencing MVFR conditions due to reduced
visibility of 3-4SM related to smoke from the nearby wildfires.
Breezy winds of 10-15kts with gusts of 15-25kts for
KDLS/KRDM/KBDN/KYKM, decreasing later this evening. 75

&&

.FIRE WEATHER...
The region will remain with elevated fire weather through the
period as there is some breezy with areas of low relative
humidity. This pattern will persist through mid-week before
giving way to an upper level trough that will bring breezier
conditions as well as the potential for mid level moisture and
instability.

&&

.Preliminary Point Temps/PoPs...
PDT  89  55  88  53 /   0   0   0   0
ALW  91  61  89  60 /   0   0   0   0
PSC  92  57  91  56 /   0   0   0   0
YKM  93  59  91  58 /   0   0   0   0
HRI  91  59  90  57 /   0   0   0   0
ELN  88  56  84  56 /   0   0   0   0
RDM  90  45  88  45 /   0   0   0   0
LGD  92  53  89  52 /   0   0   0   0
GCD  93  52  90  51 /   0   0   0   0
DLS  90  60  88  59 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
WA...Air Quality Alert until 5 AM PDT Tuesday for WAZ024-026>030-
     521>523.
OR...Air Quality Alert until noon PDT Monday for ORZ041-044-049-050-
     502-503-505>511.

&&

$$

DISCUSSION...90
AVIATION...75
FIRE WEATHER...90