Lewiston, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

105
FXUS66 KOTX 092240
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
340 PM PDT Wed Jul 9 2025

.KEY MESSAGES...

- Dry conditions and increasing winds will bring critical fire
  weather conditions today. Red Flag Warnings have been issued
  through 8pm tonight.

- Strongest winds will be seen this afternoon and evening.
  Gusty conditions expected regionwide with gusts 30 to 40 mph.

&&

.SYNOPSIS...
Increasing winds combined with dry conditions will result in
critical fire weather conditions through today. Limited shower
chances will be found over the area through Thursday, largely
near the mountains. After a brief mid-week cool down, warm
temperatures will return Friday into next weekend.

&&

.DISCUSSION...
Today through tonight: Fire weather concerns continue and peak today
as a cold front moving through brings gusty winds to the area. While
this front and the departure of the troughs will bring a brief
downtrend in temperatures down to around normal, the main impact for
today is the gusty westerly winds. With most areas already gusting
to 25mph, winds will further increase throughout the afternoon and
evening, reaching 30mph in places such as Spokane, Coeur d`Alene,
Pullman, and Lewiston. Areas that will see the highest winds are the
Wenatchee, Waterville Plateau, Moses Lake, and Upper Columbia Basin
areas, which have the potential to gust to 40-45mph. These winds
will continue through late this evening. These winds combined with
low relative humidity values create fire weather concerns, with the
potential being fires moving quickly due to wind. As a result, a Red
Flag Warning is in effect for much of the forecast area but the far
northern areas through 8pm tonight. A small shortwave embedded
within the flow will bring enough lift for a small chance of
thunderstorms in far northeastern Washington and northern Idaho
Panhandle. Surface based CAPE for these areas is 100-200 J/kg, and
biggest concerns with these thunderstorms will be gusty outflow
winds and any lightning strikes. The crest of the Cascades could see
some light precipitation, though any measurable amounts are not
anticipated. The gusty winds this afternoon will result in smoke
from the Pomas and Hope Fires being carried over the region.

Tomorrow through Sunday: As the low weakens and moves out of the
area by late tomorrow, temperatures will decrease further, to the
mid 80s. The aforementioned shortwave will continue to impact the
area tomorrow as well, bringing additional chances of light showers
to the mountains. Thunderstorm coverage will be smaller in extent
but Bonners Ferry has a 10 percent chance of thunder tomorrow
afternoon. The return to near normal temperatures will be brief, as
a ridge off the Pacific Coast flattens. This will result in
temperatures increasing back into the mid 90s. Winds tomorrow will
not be as strong as today but will still be breezy throughout the
same areas and lessen in nature through the weekend.

Monday through Wednesday: The flattened ridge will begin to amplify
on Monday due to a low pressure system strengthening near the
Aleutian Islands. This will result in northwest flow moving into the
area. While this will lower temperatures slightly and could bring a
few light showers, an uptick in winds is seen by long-term models,
which could mean the return of fire weather concerns. Clusters are
in good agreement of continuing ridging just off the Pacific
Northwest coast, and the CPC`s 6-10 and 8-14 Day Outlooks have the
state seeing increased chances of above normal temperatures and
slightly above normal chances for precipitation. /AS

&&

.AVIATION...
00Z TAFS: VFR conditions will prevail. Most TAF sites have
already gusted to 25kts or more. These gusty winds will continue
through tonight, with KEAT/KMWH anticipating the highest winds
at 35kts. Winds will decrease around 03-05Z except for KEAT,
where winds will continue for another couple hours. Smoke from
the Pomas and Hope Fires will make its way across eastern
Washington and into the Northern Idaho Panhandle. Areas that
could see smoke include GEG, SFF, and COE but confidence is not
high enough to include them in the TAFs and visibilities don`t
look to be degraded either. Chance for some thunderstorms along
the Canadian border and Panhandle, but confidence is low to
moderate. Chance for some showers along the Cascade crests, but
confidence is also low.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence
in VFR conditions through the TAF period. High confidence in
gusty winds through this afternoon and evening. Moderate
confidence in haze due to smoke but low confidence it will
impact any visibilities. Low to moderate confidence in
afternoon thunderstorms and low confidence in showers along the
Cascades. /AS

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

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        59  83  55  89  59  92 /   0   0   0   0   0   0
Coeur d`Alene  58  81  54  87  58  91 /  10   0   0   0   0   0
Pullman        54  79  52  85  54  88 /   0   0   0   0   0   0
Lewiston       66  88  63  94  64  99 /  10   0   0   0   0   0
Colville       48  81  45  87  50  93 /  10  10   0   0   0   0
Sandpoint      55  77  49  84  54  87 /  10  20   0   0   0   0
Kellogg        59  77  57  84  61  87 /   0  10   0   0   0   0
Moses Lake     59  88  59  93  60  98 /   0   0   0   0   0   0
Wenatchee      63  85  63  93  68  96 /  10   0   0   0   0   0
Omak           57  84  56  92  62  96 /  10   0   0   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
WA...Red Flag Warning until 8 PM PDT this evening for Colville
     Reservation (Zone 702)-Eastern Columbia Basin  -Palouse  -
     Spokane Area (Zone 708)-Foothills of Central Washington
     Cascades (Zone 705)-Foothills of Northeast Washington
     (Zone 701)-Lower Palouse  -Snake River (Zone 709)-
     Okanogan Valley (Zone 703)-Waterville Plateau (Zone 706)-
     Western Columbia Basin (Zone 707).
ID...&&

$$