594
FXUS66 KPDT 231157
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
357 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 will 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 to bring 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...12Z TAFs...LAV guidance has caught up with the trends
early this morning, removing the persistent dense fog for KPSC.
Visibility will still teeter between between 3/4SM and 2 miles at
YKM and PSC for the duration of the morning. A cold front will
impact the region later Tonight and early Monday bringing rains
and reduced ceilings into the MVFR category for the overnight.
Light and variable winds will become westerly overnight as the
front moves east of the region early Monday.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  33  48  27  45 /  90  20   0  10
ALW  36  47  31  43 /  90  30  10  10
PSC  33  51  26  43 /  60   0   0   0
YKM  29  49  25  43 /  20   0   0  10
HRI  34  50  27  44 /  70  10   0  10
ELN  29  45  24  40 /  20  10   0  10
RDM  24  46  20  48 /  50   0   0  10
LGD  32  43  23  43 /  90  40  10   0
GCD  32  45  24  47 /  60  20   0  10
DLS  37  51  32  46 /  60  10   0  20

&&

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

$$

SHORT TERM...95
LONG TERM....95
AVIATION...71