131
FXUS66 KOTX 301816
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1116 AM PDT Mon Jun 30 2025

.KEY MESSAGES...

- Temperatures trending much warmer through Tuesday including
  moderate to locally major HeatRisk.

- Temperatures trending cooler but still warm Wednesday through
  the remainder of the week

- A chance of mountain showers and thunderstorms Wednesday and
  Thursday.

&&

.SYNOPSIS...
Temperatures will trend much warmer beginning Sunday, and
continue through the middle of next week. Temperatures will
cool slightly for the middle to end of next week but will remain
above normal.

&&

.DISCUSSION...
Monday through Tuesday: An increase in temperatures is in store as a
ridge strengthens and moves across the state of Washington today and
tomorrow. High temperatures today will be 5-10 degrees warmer than
yesterday. Tuesday will be the hottest day of the warmup, with
temperatures rising an additional 3-5 degrees. Most areas will be in
the mid to high 90s, with some areas such as Moses Lake and Lewiston
seeing triple digits. Low temperatures tonight and tomorrow night
will be above 60 degrees, worsening overnight temperature
recoveries. Widespread Heat Risk values rise to Moderate Heat Risk
tomorrow with isolated areas of Major Heat Risk. On Tuesday, this
area of Major Heat Risk increases and includes areas such as
Lewiston, the Spokane area, and Wenatchee. When Heat Risk values
reach Moderate, anyone without effective cooling and hydration are
susceptible to heat related illnesses. As such, a Heat Advisory
has been issued for a large majority of the forecast area from
9am this morning through 9pm tomorrow evening.

Wednesday through Friday: A low pressure system off the coast of
British Columbia will lower heights and flatten the ridge, but will
only drop temperatures marginally. On Wednesday, the flattening of
the ridge will bring gusty westerly winds to the Cascade gaps and
breezy winds to much of the forecast area. The lift generated by the
pattern change will result in a chance of afternoon and evening
thunderstorms, particularly in far eastern Washington and the
Northern Idaho Panhandle where moisture will move through from
Oregon. There are chances for some light showers in these areas as
well, but any precipitation accumulation will be well below a
wetting rain. Regardless of these small shower chances, relative
humidities will drop into the teens each day today through
Wednesday. The hot and dry conditions combined with the uptick in
westerly winds will increase fire weather chances for the Moses
Lake, Wenatchee, upper Columbia Basin, and Waterville Plateau areas.
We will keep a close eye on these areas as fire weather headlines
might be needed.

Friday through Sunday: Ensemble clusters are currently in
disagreement about the overall weather pattern, with half the
clusters showing rising heights and the other half showing lowering
heights. These heights don`t look to have a huge impact on
temperatures, but the placement of the low in a couple clusters
could result in some chances of precipitation. As of right now, the
CPC has chances leaning above normal for both temperature and
precipitation. /AS

&&

.AVIATION...
18Z TAFS: High pressure will deliver clear skies and light
terrain driven winds through much of the TAF period.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence
in conditions remaining VFR across the Inland Northwest. 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        93  61  97  63  91  57 /   0   0   0   0  10   0
Coeur d`Alene  91  60  95  63  89  59 /   0   0   0   0  10  10
Pullman        91  57  94  61  88  54 /   0   0   0  10  10  10
Lewiston       99  66 102  70  96  64 /   0   0   0  10  10  10
Colville       91  53  95  54  91  49 /   0   0   0   0  10  10
Sandpoint      89  55  92  57  88  54 /   0   0   0   0  10  10
Kellogg        89  65  93  67  87  60 /   0   0   0  10  20  10
Moses Lake     98  61 101  63  95  57 /   0   0   0   0  10   0
Wenatchee      96  70  99  68  93  62 /   0   0   0   0   0   0
Omak           96  63  99  62  95  56 /   0   0   0   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
WA...Heat Advisory from 9 AM this morning to 9 PM PDT Tuesday for
     Central Chelan County-Lower Garfield and Asotin Counties-
     Moses Lake Area-Northeast Mountains-Okanogan Highlands-
     Okanogan Valley-Spokane Area-Upper Columbia Basin-
     Washington Palouse-Waterville Plateau-Wenatchee Area-
     Western Okanogan County.
ID...Heat Advisory from 9 AM this morning to 9 PM PDT Tuesday for
     Coeur d`Alene Area-Idaho Palouse-Lewis and Southern Nez
     Perce Counties-Lewiston Area-Northern Panhandle.

&&

$$