Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 061146
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
346 AM PST Sat Mar 6 2021

.SYNOPSIS..
Expect cooler temperatures this weekend along with breezy winds
and a chance of showers. A mix of rain and snow is possible in
the valleys with light snow accumulations in the mountains this
morning and again on Sunday. Mainly dry weather is expected for
the upcoming work week with temperatures with near normal
temperatures.

&&

.DISCUSSION...
Today through tonight: A moist southwest flow aloft resides across
the Inland NW while a slow moving cold front makes its way across
the region. Currently a light precipitation band stretches from
the western Columbia Basin into the Okanogan Highlands. As the
front pushes east, the precipitation band will become more
energized with an increase of instability and upslope flow. Pops
and qpf increase across the Palouse into the central/southern ID
Panhandle from mid morning into mid afternoon. Snow levels will
dip down from 2500-3000 ft which may give way to light wet snow
accumulations from the Palouse to the central Panhandle into the
Camas Prairie. Metro models shows road temperatures should remain
above freezing, although grassy surfaces may stand to see an inch
or less of wet snow. Temperatures and snow levels will rise in
afternoon with post frontal showers of rain and snow primarily in
the Panhandle mountains. West to southwest winds will increase
this afternoon with gusts of 20 to 25 mph. The more noticeable
change will be the daytime temperatures which will be much cooler
compared to the mild temperatures on Friday, down 5 to close to 15
degrees. The precipitation will decrease and skies partially
clear this evening with loss of daytime heating and weak ridging
aloft. But this will be short lived as the next system spreads
clouds eastward overnight. Expect cooler temperatures overnight
with widespread lower to middle 30s.

Sunday and Sunday night: The southwest flow aloft continues into
Sunday as an upper level trough nears the WA coast and a shortwave
pivoting over northwest WA. Moisture will increase especially
across north central WA where the best lift will be found which
will extend across the northern mountains. Precipitation will
increase Sunday morning. Based on overnight low temperatures and
snow levels, could see some light snow accumulations in the
northern valleys of up to an inch while the mountains could see 1
to 3 inches of light snow through the day on Sunday from the
northern Cascades to the far northern Idaho. Another round of
breezy west to southwest winds will develop with gusts of 20 to 25
mph. Daytime temperatures will remain cool with highs topping out
in the 40s to mid 50s. Precipitation tapers off Sunday evening
with clearing skies. This will allow overnight temperatures to dip
below freezing in many areas. /rfox.

Monday through Saturday: The low off the west coast will continue
to slowly move south and eventually push into California around
Wednesday. There may be periods of precipitation Mon and Tues
across the Blue Mtns, Camas Prairie and portions of southern
Shoshone county. Otherwise the region will largely remain dry
through the workweek. There could be late night and early morning
valley fog across portions of NE WA and the ID Panhandle.
Temperatures will be within a few degrees on either side of
average...so lows in the mid 20s to low 30s and highs in the mid
40s to mid 50s. Skies will be mostly clear to partly cloudy and
winds will generally be light. The upper level pattern for the
last part of the work week really starts to diverge in their
scenarios. The low will move through the desert southwest and a
ridge builds over the Pac NW. Given there are differences in the
strength of the low, there are then timing differences in it
exiting. By Saturday, as of now, it still looks largely dry. A
trough could be approaching the area, or the ridge could remain.
Only precip mentioned is right along the crest of the Cascades for
now. /Nisbet

&&

.AVIATION...
12Z TAFS: A slow moving cold front will push across the TAF sites
through the day. Expect VFR conditions from Wenatchee to Moses
Lake with light sprinkles and this should extend toward Omak and
Republic. As the front pushes across extreme eastern WA into north
Idaho, precipitation will increase and conditions will
deteriorate to MVFR levels with locally IFR conditions especially
near Pullman to Coeur d`Alene with a rain snow mix and wet snow
accumulations mainly on grassy surfaces. Little in the way of
accumulations are possible from Spokane to Sandpoint. Gusty west
to southwest winds will develop this afternoon. Ceilings will
lift across the Columbia Basin by midday, while gradual
improvements are expected in extreme eastern WA into north Idaho
by this afternoon and evening. Winds will decrease this evening
while mid level clouds increase overnight. /rfox.

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        47  32  47  27  47  28 /  30   0  20   0   0   0
Coeur d`Alene  45  32  45  26  46  26 /  70  10  30   0   0   0
Pullman        42  31  45  29  46  29 /  80   0  20  10  10  10
Lewiston       48  35  51  33  49  33 /  60   0  10  10  10  10
Colville       50  31  47  25  47  25 /  30  10  50  10   0   0
Sandpoint      43  31  42  27  44  26 /  70  10  60  10   0   0
Kellogg        39  29  41  28  43  28 /  70  20  50  10  10  10
Moses Lake     55  34  54  27  53  29 /   0   0  10   0   0   0
Wenatchee      51  34  48  28  47  30 /   0  10  10   0   0   0
Omak           51  33  49  25  48  27 /   0  10  50   0   0   0

&&

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

&&

$$



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