Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 230328
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
728 PM PST Sun Jan 22 2017

.SYNOPSIS...
Rain and snow will shift into northern Washington and Idaho
tonight. Wet snow accumulations are likely in the Methow Valley
...Okanogan Highlands...and Northeast Mountains. Snow showers
will linger into Monday over far northeast Washington and the
Idaho Panhandle. A drier and cooler weather pattern is expected
next week with the possibility of deteriorating air quality as the
week wears on.


&&

.DISCUSSION...
Evening update: A band of light to moderate precipitation
developing ahead of an approaching frontal occlussion will
continue to slowly shift north bringing a mix of rain and snow
below 2000 feet and mainly snow above. Most lowland roads were
generally wet through sunset...with one exception, the Coulee
City area. Moderate to heavy precipitation rates and temperatures
hovering 32-33F resulted in several hours moderate snow and
accumulations near 4 inches.

As of 7PM...precipitation has ended for the Western Columbia Basin
and will begin winding down from south to north across the
Palouse, L-C Valley, Camas Prairie, and Spokane Area during the
next 2-3 hours. Light precipitation will linger over the Idaho
Panhandle and Northern Mountains of WA into Monday morning however
we will see a drastic reduction in dendritic omega after midnight
resulting in a light to very light intensities intensities.

Update also included the expiration of the winter weather advisory
for the Waterville Plateau with this update and slight increase in
overnight lows with widespread stratus and fog expected.

We will be looking into fog coverage and restrictions to
visibility to determine if dense fog advisories will be needed for
the overnight hours and Monday commute. /sb

&&

.AVIATION...
00Z TAFS: An occluded frontal band will pass from south to north
through the forecast area this evening bringing generally MVFR
ceilings and vis in -RASN to the eastern TAF sites except for
KLWS which will see occasional VFR ceiling rain showers. KEAT and
KMWH area largely behind the front but will likely experience IFR
and LIFR stratus and fg as skies clear after 06Z
tonight...continuing through Monday morning with some improvement
to MVFR stratus ceilings in the afternoon. The KGEG area TAF
sites will also develop IFR ceilings after precipitation shuts
down due to weak upslope flow and a very moist boundary layer.
KPUW and KLWS will benefit from low level drying easterly flow and
should be VFR Monday. /MJF




&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        29  34  24  31  19  30 / 100  10  10  10  10  20
Coeur d`Alene  30  34  23  32  20  31 / 100  10  30  30  20  30
Pullman        30  34  22  32  19  30 /  90   0  40  40  20  30
Lewiston       31  39  27  34  23  33 /  80   0  30  30  10  20
Colville       31  34  22  29  20  28 / 100  20  10  10  10  10
Sandpoint      31  34  23  31  21  29 / 100  30  20  30  20  30
Kellogg        30  33  21  29  19  29 / 100  10  40  40  30  40
Moses Lake     28  34  22  31  16  30 /  10   0  10  10  10  10
Wenatchee      29  34  25  28  17  28 /  10   0   0  10  10   0
Omak           32  33  24  30  15  29 / 100  20  10  10  10   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...Winter Weather Advisory until 10 PM PST this evening above 1500
     feet for East Slopes Northern Cascades.

     Winter Weather Advisory until 4 AM PST Monday above 2500 feet
     for Okanogan Highlands.

     Winter Weather Advisory until 7 PM PST this evening above 2000
     feet for Waterville Plateau.

&&

$$


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