Lewiston, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

869
FXUS66 KOTX 102216
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
316 PM PDT Sun Aug 10 2025

.KEY MESSAGES...

- Drying and warming trend through Tuesday.

- Elevated to critical fire weather conditions possible Tuesday
  through Wednesday with warm, breezy conditions.

- Cooling trend Wednesday through Friday.

&&

.SYNOPSIS...
A warming trend will provide more typical summer like conditions
over the next few days, with the warmup peaking on Monday and
Tuesday as high temperatures warm into the high 90s to low 100s.
Breezy winds will usher in a gradual cool down Wednesday through
Friday.

&&

.DISCUSSION...
Heat early week: The warming trend is well underway high
temperatures around 90 to 100 degrees. The warmest days will be
Monday and Tuesday with temperatures around 92 to 103 degrees. Heat
advisories continue through Tuesday evening for much of the INW.

Fire weather Monday: The main area of concern for fire Monday is the
Okanogan Valley. Expecting elevated fire weather conditions with
downvalley north winds around 15-20 mph in the morning with
decreasing RHs into the low 20s around 10AM-2PM before upvalley flow
opposes the pressure gradient driven winds. A red flag warning was
considered given hi-res models sustain breezy north winds and RHs
slipping into the teens after 2 PM but ultimately was not utilized
given marginal fuels and lower confidence of the north winds
maintaining their strength into the afternoon.

Fire Weather Tuesday: As the ridge retrogrades west, a shortwave on
top of the ridge and a upper low in northern Alberta will act to
increase west/east pressure gradients in the Pacific Northwest.
Given increasing pressure gradients, concerns broaden Tuesday for
westerly winds around 10-15 mph and RHs in the teens to low 20s in
the afternoon for the Columbia Basin, Palouse, Spokane area, and
Snake River valley. Wind speeds peak around 15-20 mph in the Cascade
gaps around 5-8 pm but RHs appear to be above critical levels at
that time.

Fire weather Wednesday: Wednesday has the greatest potential for
critical fire weather conditions in much of central and eastern
Washington. Models are in generally good agreement that the
shortwave in western BC pivoting towards the base of the trough and
the wave riding the top of the ridge will phase together around
Vancouver Island and bring breezy to windy conditions to the INW.
Expecting westerly winds around 15-25 mph gusting around 25-35 mph
with RHs in the upper teens to low 20s for the Columbia Basin,
Palouse, Spokane area, and Snake River valley.

Cooler with showery conditions into late this week: Models are in
generally good agreement of another trough forming and bringing
increased chances for precipitation especially near the Canadian
border. Temperatures will be below average in the upper 70s to upper
80s late this week. DB

&&

.AVIATION...
00Z TAFS: VFR conditions will prevail with light winds in most
areas. Breezy north winds will develop for KOMK tonight and into
early tomorrow afternoon around 15/20 G30kt and slowly decrease
into the afternoon hours.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS:
High confidence for VFR conditions.

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

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        64  96  63  97  66  92 /   0   0   0   0   0   0
Coeur d`Alene  64  95  63  95  64  90 /   0   0   0   0   0   0
Pullman        59  93  60  94  61  87 /   0   0   0   0   0   0
Lewiston       69 101  69 102  70  97 /   0   0   0   0   0   0
Colville       54  94  51  95  53  91 /   0   0   0   0   0   0
Sandpoint      58  92  57  93  58  89 /  10   0   0   0   0   0
Kellogg        65  92  66  93  66  87 /   0   0   0   0   0   0
Moses Lake     63  99  68 100  64  94 /   0   0   0   0   0   0
Wenatchee      71  99  73 100  71  91 /   0   0   0   0   0   0
Omak           68  97  65 100  64  94 /   0   0   0   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
WA...Heat Advisory from noon Monday to 8 PM PDT Tuesday for Lower
     Garfield and Asotin Counties-Northeast Mountains-Spokane
     Area-Washington Palouse.
     Heat Advisory until 8 PM PDT Tuesday for Central Chelan County-
     Moses Lake Area-Okanogan Valley-Upper Columbia Basin-
     Waterville Plateau-Wenatchee Area-Western Okanogan County.
ID...Heat Advisory from noon Monday to 8 PM PDT Tuesday for Central
     Panhandle Mountains-Coeur d`Alene Area-Idaho Palouse-
     Lewiston Area-Northern Panhandle.

&&

$$