Area Forecast Discussion
Issued by NWS Spokane, WA

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948
FXUS66 KOTX 031854
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1054 AM PST Sat Dec 3 2016

.SYNOPSIS...
Deep low pressure will bring rain, wind, and heavy mountain snow
to the Inland Northwest tonight into Sunday. The heaviest snow
accumulations will occur over the Cascade Crest and the mountains
of the Idaho Panhandle. Much colder temperatures will arrive
Sunday night and remain through Thursday. Light valley snow will
be possible with a weak weather system on Monday. Additional snow
will be possible late next week.

&&

.DISCUSSION...
Light snow showers will linger over the Cascade crest and in the
central to northern ID Panhandle tonight. Not much additional snow
accumulations are expected, so the Winter Weather Advisory for the
Central Panhandle Mtns was allowed to expire. However, confidence
is high that we will see heavy mountain accumulations over the
Central Panhandle Mtns with the next weather system set to arrive
tonight. This area is under a Winter Storm Warning that will be in
effect for tonight through Sunday above 3,000 feet in elevation.
Additional snow accumulations with this next system will be up
near a foot with treacherous travel expected over Lookout Pass.
Snow levels will be dropping into Sunday with precipitation
transitioning over to snow in the Silver Valley, but not expected
to see enough moisture for significant impacts from snow.

We have also gone ahead and issued a Winter Weather Advisory for
snow over the Camas Prairie from late tonight through Sunday
evening. This hazard also is highlighting areas above 3,000 feet
where 3 to 7 inches of snow is expected. Highway 95 will likely
become snow covered up on the Camas Prairie resulting in slick and
hazardous travel conditions.

The Cascade crest will also see heavy snow accumulations, but will
mainly only impact Stevens Pass in our area of responsibility. No
highlights are anticipated in the East Slopes of the Northern
Cascades at this time and will allow Seattle to highlight the
impacts up along the crest with their Winter Storm Warning. Other
areas that may see moderate to heavy snow accumulations will be
the Northern Panhandle Mtns and Northeast Blue Mtns, but will hold
off on a highlight at this time as total snow accumulations look
to remain below criteria. /SVH

&&

.AVIATION...
18Z TAFS: VFR at all taf sites with the exception of MIFG at KEAT
that should quickly dissipate. The arrival of our next round of
precipitation tonight will be accompanied by a strong mid/upper
level westerly jet. Much of central and eastern Washington will be
under the influence of the rain shadow as our mountains get
hammered with snow. Valley -ra or -rasn is possible for the
eastern TAF sites. Low level wind shear was added to the Wenatchee
TAF as the jet increases overnight. Strong winds just above the
surface is possible at all taf sites overnight, but the best
chance of llws will be EAT where the strongest winds exist.
/Nisbet


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        40  34  38  19  28  15 /  10  30  40  10  10  30
Coeur d`Alene  40  34  37  18  26  14 /  10  70  70  10  10  20
Pullman        43  35  37  20  28  17 /  20  70  90  20  10  30
Lewiston       47  38  41  25  33  22 /  10  30  90  30  10  40
Colville       39  34  37  17  27  13 /  10  30  20  10  10  20
Sandpoint      40  33  37  17  25  13 /  20  90  80  10  10  10
Kellogg        37  33  36  17  23  12 /  40 100 100  40  10  20
Moses Lake     46  34  44  20  35  19 /   0  10  10  10  30  30
Wenatchee      43  35  43  23  32  21 /  10  10  10  10  50  40
Omak           40  31  38  17  30  14 /   0  10  10   0  20  30

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Winter Storm Warning from 10 PM this evening to 10 PM PST Sunday
     above 3000 feet for Central Panhandle Mountains.

     Winter Weather Advisory from 1 AM to 10 PM PST Sunday above 3000
     feet for Lewis and Southern Nez Perce Counties.

WA...None.
&&

$$



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