380
FXUS66 KOTX 302335
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
335 PM PST Sun Nov 30 2025

.KEY MESSAGES...

- Light snow late Monday into Tuesday, especially in the
  Central Panhandle Mountains.

- Modifying temperatures and a transition of snow to rain late
  this week.

&&

.SYNOPSIS...
A weather system on late Monday into Tuesday will bring light
snow mainly to the Idaho Panhandle and extreme Eastern
Washington. Temperatures will modify and warm above normal late
this week. Unsettled late this week as well with snow
transitioning to rain in the lowlands.

&&

.DISCUSSION...
Tonight: A short wave ridge off the coast will move over the
region tonight for dry conditions. An abundance of stratus today
over Southeast Washington into the south ID Panhandle has been
slowly moving north this afternoon as boundary layer winds shift
out of the south. Continued expansion of stratus northward is
expected through tonight, which should help keep fog coverage
mostly patchy in coverage.

Monday through Tuesday: A wave topping the ridge moves over the
region bringing an increased threat of mainly snow Monday
afternoon into Tuesday as colder temperatures support low snow
levels. Precipitable water values briefly increase to around
150-175% of normal, which combined with isentropic ascent into
the ID Panhandle and eastern third of Washington leads to the
development of light snow. The highest amounts are expected in
the Central Panhandle Mountains and the Camas Prairie where
upslope flow is maximized. The 12z ECMWF ensembles have trended
upward with precipitation totals and snow amounts. Here are the
latest NBM chances for 1" of snow or more: Colville: 20%,
Spokane 15%, Pullman 20%, Sandpoint 60%, Kellogg 60%. Given that
the latest NBM doesn`t have the 12z ECMWF ensembles
incorporated, it`s possible that these numbers increase with the
next run.

Tuesday Night and Wednesday: As this system pushes east, a short
wave ridge moves in for another drier period. A moist boundary
layer combined with the ridge is a good setup for more fog and
stratus over the region.

Thursday through Sunday: An active pattern becomes established
by the weekend as an arctic air mass slides south into Central
British Columbia, while a strong pacific jet also takes aim at
the region. The jet is likely to keep cold air well north of our
area, with 85% of the ensembles favoring an active jet over the
region with an influx of moisture and milder air. The increase
in temperatures and snow levels will result in mainly a valley
rain and mountain snow situation although some valleys may begin
as snow with the inital warm front late Thursday or Friday
before snow levels rise. The strong jet will also bring breezy
to windy conditions on Friday. There is some model spread in the
details that far out regarding exactly how windy. The NBM
currently has a 30% chance of wind gusts exceeding 40 MPH at
Wenatchee and Pullman, and a 15% chance for Spokane. Wenatchee
has a 20% of gusts exceeding 50 MPH as well. Similar
probabilities are forecast for Saturday and Sunday. JW


&&

.AVIATION...
00Z TAFs: MVFR stratus over the Palouse and across much of NE
Washington and the ID Panhandle will continue to expand across
the northern valleys tonight as light southerly boundary layer
continues to advect moisture northward. Forecast soundings show
the potential for stratus to lower overnight although with a
slight increase in south-southeast boundary layer winds ahead of
a warm front significantly lower of the stratus deck is not
expected. Yet enough so that IFR conditions may develop
overnight at KGEG/KPUW. As the warm front passes on Monday there
is a 30% chance of light snow developing at KCOE around 18z, and
a 20% chance for KGEG/KSFF/KPUW.

.FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS:
There is moderate confidence in CIGS around 800-1500 feet AGL
tonight for KGEG/KSFF/KCOE. An alternate scenario is fog
develops this evening on the fringes of the stratus in western
Whitman and eastern Adams counties and then light southerly
winds advect the fog into KGEG. There is low confidence in the
timing of the stratus breaking up at KPUW/KLWS. There is
moderate confidence that the stratus expansion stays north and
east of KMWH overnight and Monday morning. There is also
moderate confidence that the thickening mid and high level cloud
deck limits radiational fog from developing around Wenatchee. JW

-----------------------

Confidence descriptors:
Low - Less than a 30 percent chance
Moderate - 30 to 70 percent chance
High - Greater than a 70 percent chance

For additional probabilistic information for NWS Spokane
airports,please refer to the Aviation Dashboard on our
webpage: https:/www.weather.gov/otx/avndashboard

&&

.Preliminary Point Temps/PoPs...
Spokane        25  32  28  34  24  36 /   0  20  40  20   0   0
Coeur d`Alene  25  33  29  35  27  38 /   0  20  60  40   0   0
Pullman        24  36  29  35  28  38 /   0  20  50  70  10   0
Lewiston       28  38  33  41  33  42 /   0  10  40  60  10   0
Colville       19  32  22  37  19  37 /   0  40  40  10   0   0
Sandpoint      22  32  27  34  25  35 /  10  50  80  40  10  10
Kellogg        25  33  32  35  29  38 /   0  30  70  80  10  10
Moses Lake     24  36  27  38  24  38 /   0  10  20   0   0   0
Wenatchee      29  35  32  39  30  41 /   0  10  20   0   0   0
Omak           25  35  27  39  27  39 /   0  20  20   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
WA...None.
ID...None.

&&

$$