Spangle, Washington Weather Forecast Discussion

295
FXUS66 KOTX 222211
AFDOTX
Area Forecast Discussion
National Weather Service Spokane WA
311 PM PDT Mon Sep 22 2025
.KEY MESSAGES...
- Patchy fog and patchy frost in the sheltered northeast valleys
  Tuesday morning.
- Warming back to above normal Tuesday through Thursday
- Breezy, dry conditions Thursday with elevated fire weather
  conditions.
&&
.SYNOPSIS...
Dry weather will occur this week along with a warming trend
through the middle of the week, with high temperatures in the
80s by Wednesday. Dry and breezy conditions are expected
Thursday with temperatures dropping back into the 70s for the
end of the week.
&&
.DISCUSSION...
Tonight through Wednesday: High pressure will continue to build
in through the next couple days. This will result in relatively
benign weather, aside from a couple things. Clear skies and
light winds tonight should allow temperatures to drop into the
30s and 40s. This morning some areas dropped below freezing,
while others stayed rather mild under the stratus/fog. The
stratus and fog is not expected to that abundant tonight, just
patchy in the northeast valleys and near bodies of water. Models
were not cold enough in the area that cooled off this morning,
so I carried that into Tuesday morning. As a result some areas
are expected to see some low to mid-30s, resulting in possible
frost. A frost advisory was issued for Ferry, Stevens, Pend
Oreille, Boundary and Bonner county, but the frost will be
most found in the sheltered valleys. There could also be some
frost over southern Spokane county into Benewah County, so keep
an eye on that.
Otherwise the weather remains dry and temperatures warm above
normal, with highs in the 70s and 80s. The warmest day is
forecast to be Wednesday.
Thursday to Monday: shortwave troughs start to move inland and
dampen the ridge. Initially they area still remains dry, with
the brunt the moisture and energy staying north of the Canadian
border. However the flattening flow, increasing west to east
gradient will lead to increased winds for Thursday and Friday.
The stronger winds are expected Thursday and combined with lower
RH values, this will elevated fire weather concerns.
Temperatures start to trend downward and moisture starts to
increase a bit Friday, with clouds starting to enter the area
too. So the elevated fire weather conditions start to back off
on Friday. Saturday into Monday the moisture increases a bit
more and more shortwave energy enters, stating to increase
clouds more and start to bring slight shower chances. The first
chances come to the Cascades later Saturday, then expand to the
other mountain zones Sunday. It isn`t until late Sunday night
into Monday that the rain shower chance expand out to the basin
and valley zones. However, away from the Cascade crest,
precipitation amount still look light. Temperatures will still
be in the 70s to low 80s for highs.
Air quality: smoke from regional wildfires will continue to
impact the air quality. The most robust smoke producer in our
area remains the Sugarloaf and Labor Mountain Fires. Smoke
models continue to show the near-surface smoke active through at
least midweek. This makes sense give the milder temperatures and
near Cascade thermal trough and steepening lapse rates in
the afternoon. The WA Department of Air Quality continues to
have an air quality alert until further notice and they will
continue to assess things as the days progress. /Solveig
&&
.AVIATION...
00Z TAFS: High pressure and drier air will bring generally VFR
conditions. Low clouds and patchy fog will be possible over the
NE WA and N ID valleys overnight into early Tuesday; however
coverage is expected to be less than Monday morning. Some could
be found near the rivers, including the vcnty of SFF/COE, but
confidence is low. Wind will be light.
FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence
in VFR through Tuesday. Low confidence in morning fog impacting
SFF/COE. Low confidence of smoke reducing visibility below 6
miles for any of the TAF sites.
-----------------------
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:/weather.gov/otx/avndashboard
&&
.Preliminary Point Temps/PoPs...
Spokane        42  79  49  84  52  82 /   0   0   0   0   0   0
Coeur d`Alene  41  79  50  84  52  83 /   0   0   0   0   0   0
Pullman        39  78  48  84  50  80 /   0   0   0   0   0   0
Lewiston       48  83  54  88  57  86 /   0   0   0   0   0   0
Colville       32  78  38  83  40  81 /   0   0   0   0   0   0
Sandpoint      38  76  45  81  47  80 /   0   0   0   0   0   0
Kellogg        45  79  55  83  57  80 /   0   0   0   0   0   0
Moses Lake     42  81  45  83  48  83 /   0   0   0   0   0   0
Wenatchee      50  79  56  85  58  81 /   0   0   0   0   0   0
Omak           42  80  50  84  52  83 /   0   0   0   0   0   0
&&
.OTX WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory from 2 AM to 10 AM PDT Tuesday for Northeast
     Mountains-Okanogan Highlands.
     Air Quality Alert until further notice for Central Chelan
     County-Okanogan Valley-Waterville Plateau-Wenatchee Area
     -Western Chelan County.
ID...Frost Advisory from 2 AM to 10 AM PDT Tuesday for Northern
     Panhandle.
&&
$$

NWS OTX Office Area Forecast Discussion