957
FXUS66 KPDT 231820
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1020 AM PST Sun Nov 23 2025

.DISCUSSION...A shortwave is crossing the WA/OR area, allowing
for light rain to develop across the WA basin and the northern
part of the OR basin. Light showers will continue to move across
the areas through the rest of the night, while a cold front west
of the Cascades brings shower/light wintry mix in the Cascade
region through the morning. Areas of fog continue through portions
of the Basin, but some of the heavier fog has lifted to 2 to 5
miles thanks to the trough mixing the surface.

Another system will push through late Sunday evening into Monday
morning, bringing valley rain and a wintry mix in portions of the
Blue Mountains. Snow levels drop to 2000 to 3000 feet, allowing
the Cascades to see more snow dominant precipitation (90%+
chance). Most accumulations will be up to three inches in parts of
the Cascades, while the tallest crests will see upwards of 5 to 7
inches. We`ll get a dry breakout going into Tuesday thanks to
some weak form of a ridge overhead, but will be short lived as the
next system brings disturbed weather through much of the
remaining week. An advancing warm front will pass through the
region Wednesday morning, with snow levels rising from 2000 to
3000 feet to 6500 to 7000 feet after the passage, limiting the
snow fall to parts of the Cascades after late Wednesday morning to
early Wednesday afternoon. Prior to the front passage, abundant
snowfall is forecast coupled with valley rain is expected.
Heaviest snow accumulation is expected to be between Tuesday
afternoon to Thursday morning, with snow amounts up to 10 inches
in part of the Cascades and 5 to 7 inches for Snoqualmie Pass
(40-60% chances). Will need to monitor for advisory-level criteria
and if highlights are necessary that could impact holiday travel.

Heading into Thanksgiving morning through Friday, snow will
transition more into a wintry mix, with more mountain showers
present. A cold front is expected to pass sometime Friday into
Saturday (though timing is a bit difficult given it is through
Day 7 at this point). This will allow more widespread snow and
rain chances heading into the weekend, but precise impacts will
need to be monitored as we head closer into the event.

&&

.AVIATION...18Z TAFs...IFR to MVFR VSBY at YKM is expected (90
percent confidence) to lift by late morning to early afternoon.
Temporary sub-VFR CIGs/VSBYs may occur (30-60% confidence,
highest at ALW/PDT) this evening into the early overnight period
as a cold front brings rain and lowering ceilings. Light and
variable winds today will become gusty southwesterly to westerly
this evening and overnight in the wake of FROPA.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  52  33  48  27 /  20  90  20   0
ALW  51  36  47  31 /  20  90  30  10
PSC  53  33  51  26 /  20  60   0   0
YKM  53  29  49  25 /  20  20   0   0
HRI  53  34  50  27 /  10  70  10   0
ELN  49  29  45  24 /  40  20  10   0
RDM  53  24  46  20 /  10  50   0   0
LGD  51  32  43  23 /  10  90  40  10
GCD  55  32  45  24 /  10  60  20   0
DLS  51  37  51  32 /  50  60  10   0

&&

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

$$

DISCUSSION...95
AVIATION...86