759
FXUS66 KPDT 072349
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
449 PM PDT Tue Oct 7 2025

Updated Aviation Discussion

.DISCUSSION...Effective radiative cooling with clear, calm
conditions continues overnight as the upper-level ridge of high
pressure continues to take place over the Pacific Northwest. We`ll
see another round isolated/patchy areas of frost across the
coldest parts of Central OR and other parts of the Southern
Blues. Lows tonight will be a tad warmer than last night, so not
expecting as much freezing tonight. Areas across the higher
terrains and the deep sheltered valley areas will see lows dip
just below/at freezing (30-50% confidence).

Our next weather system will originate from the Gulf of Alaska,
as a trough digs south through the mid-week, gradually
transitioning into a low pressure system through Thursday. After
the initial low progresses pass the area, a second shortwave is
expected to develop right behind the low, to extend rain/mountain
snow chances through Sunday/early Monday. Precip chances will be
highest Friday going into Sunday, with chances higher in
elevated/mountain regions (70-90% chance) than in the Basin
(30-50% chance). Snow levels will drop to 4500-5000 feet Saturday-
Sunday, allowing chances for measurable snow to accumulate in the
mountains (50-80% chance). As the next shortwave makes its way
into the region Sunday, models suggest winds will get stronger,
especially across the Columbia Basin/Gorge and the Cascade Gaps.
NBM suggests 40-60% chances of wind gusts 45 mph or greater going
through Sunday.


.AVIATION...00Z TAFs...VFR conditions to prevail through the
period. Winds will be light, 12kts or less, and diurnally/terrain
driven. Lawhorn/82

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  44  72  42  68 /   0   0  10  10
ALW  49  74  47  70 /   0   0  10  10
PSC  40  74  42  70 /   0   0  10  20
YKM  42  71  44  67 /   0   0  30  40
HRI  41  72  42  70 /   0   0  10  20
ELN  38  67  40  66 /   0   0  40  30
RDM  35  72  35  62 /   0   0  30  30
LGD  42  74  43  75 /   0   0  10  10
GCD  40  76  44  75 /   0   0  10  10
DLS  46  67  47  66 /   0   0  40  40

&&

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

$$

DISCUSSION...95
AVIATION...82