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Area forecast discussion...updated 
National Weather Service Spokane Washington
638 PM PST Sat Dec 20 2014

Synopsis...
a more active weather pattern will continue into early next week.
Another wet and robust weather system will bring snow to the
mountains with mainly rain for the valleys today and tonight.
Another storm system will impact the region around Christmas eve
bringing the potential for heavy mountain snow and valley rain.
Temperatures are expected to remain above average through early
next week...before dropping down toward normal values by Christmas
day.

&&

Discussion...
update this evening was to add a Wind Advisory for the Waterville
Plateau, Moses Lake area, upper Columbia Basin, Spokane area,
Washington and Idaho Palouse, Lewiston area, lower Garfield and
Asotin counties, Lewis and southern Nez Perce counties and the
northeast Blue Mountains. A surface low to our northeast will
develop and create a very strong pressure gradient across the
inland northwest starting early Sunday morning. 850 and 700 mb
winds of over 50kts are shown on both the GFS and NAM. The 1.33km
WRF/GFS shows 10m winds easily 25 kts with some pockets of 30 kts
in there. Given the strong shortwave moving in as well, wouldn't
be surprised to see some of these stronger winds aloft mixing down
towards the surface. The main areas of concern are along the
Waterville Plateau and into the Ephrata area early Sunday
morning...as well as southern Whitman co and northern Garfield co
Sunday morning. Winds will decrease a little in the
afternoon...but will still be considered windy to all. /Nisbet

&&

Aviation...
00z tafs: a strong and very moist storm system will bring steady
rain to all terminals through Sun morning. Look for MVFR/IFR
conditions. Winds are expected to increase later this evening
into Sunday. There is a moderate potential for several hours of
low level wind shear as winds 2-3k ft agl incr btwn 45-60 kts. Strong winds will
continue Sunday coupled with decreasing pcpn and improving
cigs/vis aft 18z. Most terminals will have a strong potential to
experience VFR conditions btwn 21-00z with gusty winds continuing
into the early evening. /Sb

&&

Preliminary point temps/pops...
Spokane 40 47 32 38 29 39 / 100 20 10 10 10 30
Coeur D'Alene 37 46 32 38 29 38 / 100 40 20 20 10 40
Pullman 41 51 36 42 31 43 / 100 80 50 20 10 40
Lewiston 42 56 40 47 33 46 / 90 60 50 20 10 30
Colville 35 41 29 37 28 36 / 100 20 20 10 10 40
Sandpoint 35 41 32 37 27 35 / 100 60 30 20 10 40
Kellogg 35 43 33 37 28 35 / 100 90 80 30 10 50
Moses Lake 41 50 32 42 30 42 / 70 10 10 10 10 20
Wenatchee 37 47 33 40 30 38 / 70 20 10 10 20 30
Omak 34 41 27 35 27 35 / 90 10 10 10 20 40

&&

Otx watches/warnings/advisories...
Idaho...Wind Advisory from 3 am to 4 PM PST Sunday for Idaho Palouse-
Lewis and southern Nez Perce counties-Lewiston area.

Washington...Winter Weather Advisory until 11 PM PST this evening for east
slopes northern Cascades.

Wind Advisory from 3 am to 4 PM PST Sunday for lower Garfield
and Asotin counties-northeast Blue Mountains-Spokane area-
upper Columbia Basin-Washington Palouse.

Wind Advisory from 3 am to 10 am PST Sunday for Moses Lake area-
Waterville Plateau.

&&

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