Spokane Valley, Virginia 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

221
FXUS66 KOTX 250456
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
956 PM PDT Thu Apr 24 2025

.KEY MESSAGES...

- Dry weather through Friday with chances for showers and
  thunderstorms over the weekend.

- Breezy to windy Sunday, especially over central WA and near
  the Blue Mountains. Remaining dry in the lee of the Cascades
  into the western Columbia Basin.

&&

.SYNOPSIS...
Warm and dry weather is expected through at least Friday with
high temperatures in the upper 60s and 70s. The arrival of a
frontal system Saturday and Sunday will produce locally gusty
winds for central Washington and the chance for showers across
southeast Washington and north Idaho. Mountain showers and
seasonably breezy conditions are expected early next week.
Warmer and drier weather returns Thursday into Friday next week.

&&

.DISCUSSION...
Tonight through Sunday night: The western U.S. is under a highly
amplified pressure pattern with high pressure extending from the
Inland Northwest up into western Canada; while in the eastern
Pacific is a digging trough of lower pressure. The trough will split
in the next couple of days and models are trending further south
with a closed low forming and pushing into California. The bulk of
the moisture will also dive further south, wrap around the low, and
then push up across eastern Oregon and western Idaho by Saturday
afternoon. Tomorrow will continue to be warm with temperatures 5 to
8 degrees warmer compared to today. Expect highs to be in the 70s
and approaching 80 for our warmer spots from Moses Lake to Washtucna
to the Lewiston-Clarkston Valley.

Temperatures aloft on Saturday will cool slightly across the Cascade
crest and up into southeast Washington and the southern Idaho
Panhandle. There will also be some clouds beginning to spread in
from the south as that moisture advects more into the region. As
such, Lewiston looks to be a few degrees cooler on Saturday, but
places from Moses Lake to Wenatchee to the Okanogan Valley looks to
be on par to Friday`s temperatures if not 1-3 degrees warmer with
highs in the upper 70s to near 80. That moisture pushing north will
need to be monitored as surface heating in the afternoon may provide
enough instability for thunderstorms to develop late in the
afternoon and into the evening across extreme southeast Washington
into the southern to central Idaho Panhandle. The limiting factor
for convection will be the lack of dynamics to get convection
popping. There will be convective inhibition to overcome, and this
inhibition will be weaker over the mountains compared to the
valleys. Places from Pullman to Kellogg and points southeastward to
St. Maries, Lewiston, and the Camas Prairie have a 15% chance for
thunderstorms Saturday.

By Sunday, flow will have turned more onshore with the cross Cascade
pressure gradient tightening and cooler air surging through the
Cascade gaps. There will also be weak cold air advection across the
rest of the region with a weak westerly gradient setting up. Winds
will on Sunday will be breezy to windy. Strongest winds will be in
the lee of the Cascades sustained between 15-25 mph and gusts
between 30-40 mph. The 40 mph gusts will be most likely along
exposed ridges. Winds will be a bit breezy out of the north-
northwest through the Okanogan Valley and Methow Valley with
gusts up to around 20-25 mph. Similar west-northwest winds are
expected along Alpowa Summit, along the southern portion of the
Palouse, into the Lewiston-Clarkston Valley, and up on the
Camas Prairie. This pattern doesn`t typically generate winds
quite as strong across the Spokane- Coeur d`Alene corridor, into
the Northeast Mountains and the Northern Panhandle. The
atmosphere remains conditionally unstable in the Idaho Panhandle
for Sunday afternoon. There is a weak shortwave disturbance
that looks to push through that would help to kick off
convection. Otherwise, showers and thunderstorms will mainly be
generated by differential heating. There is a 20% chance for
thunderstorms.

Monday through Tuesday night: A shortwave trough of lower pressure
will swing across early next week. There is uncertainty with the
strength of this disturbance, but what does have good
consistency is the moisture available with it. P-wats ahead of
this disturbance will increase to around 0.8 inches over the
Inland Northwest and around 150% of normal. The general
consensus is for this disturbance to come through as an open
wave with westerly flow at mid levels of the atmosphere. The
westerly flow should result in a rain shadow in the lee of the
Cascades. The Cascade crest will see the best potential for over
a tenth of an inch of rainfall Monday night into Tuesday. The
Idaho Panhandle will also see a good chance for wetting rains of
at least a tenth of an inch of rainfall. The Columbia Basin is
unlikely to see much rain if any at all. Westerly winds will
continue to remain breezy both Monday and Tuesday.

Wednesday through Thursday: High pressure will rebound over the
region resulting another warming and drying trend. Temperatures
look to warm back up into the 70s by Thursday of next week. Much
more uncertainty at the end of the work week into next weekend;
however, there is potential for unsettle conditions to return.
/SVH

&&

.AVIATION...
06Z TAFS: VFR conditions and light, variable winds anticipated
at every TAF site through the forecast period. Daytime mixing
could bring breezy winds during the late the morning, early
afternoon hours.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence
in VFR conditions at TAF sites through the period.

&&

.Preliminary Point Temps/PoPs...
Spokane        41  74  45  74  44  71 /   0   0   0  10  10  10
Coeur d`Alene  40  73  42  72  43  69 /   0   0   0  20  10  20
Pullman        39  71  46  69  44  65 /   0   0  10  20  20  10
Lewiston       44  78  50  75  50  72 /   0   0  10  20  20  10
Colville       38  74  40  75  41  73 /   0   0   0  10  10  20
Sandpoint      36  71  43  71  45  68 /   0   0   0  20  20  40
Kellogg        40  69  45  70  47  66 /   0   0   0  30  20  40
Moses Lake     41  79  46  80  46  74 /   0   0   0   0   0   0
Wenatchee      45  76  50  78  48  72 /   0   0   0  10   0   0
Omak           40  76  46  78  45  73 /   0   0   0   0   0   0

&&

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

&&

$$