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FXUS66 KOTX 171756
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
956 AM PST Sun Dec 17 2017

.SYNOPSIS...
Light snow returns on Sunday with the potential for moderate
accumulations on area mountain passes. A warmer and windier
weather system impacts the region Tuesday into Wednesday bringing
the potential for heavy mountain snows and mix of rain and snow in
the lower elevations. The weather will then be dry and cold for
the remainder of the week.

&&

.DISCUSSION...
Morning update: Made some adjustments to precipitation type for
the lower Basin. Precipitaiton is light but getting reports of
freezing rain and sleet around Lind, Quincy, and Moses Lake. This
lines up well with the NAM12km warm nose which will continue to
slowly expand north and east through the next 24 hours. The main
threat for mixed precipitation types shift northward toward
Ephrata, Banks Lake, and into Grand Coulee as well as the Columbia
River Valley. Amounts will remain extremely light in these rain
shadowed areas. Further east around the Snake and Clearwater River
Valleys, temperatures are still below freezing but will have time
to warm before the midlevel warming arrives around 4-6PM tonight.
Surface winds are increasing from the south and this will help
bring surface temperatures above freezing avoiding a lot of mixed
precipitation types for the unsheltered Palouse and West Plains.
Precipitation intensity will pick back up across the eastern third
of WA and N ID late this afternoon and evening as a deep slug of
moisture spills inland. This will bring one last shot of
accumulating snow into the Spokane- Cd'A - Pullman areas before
switching over to rain.

&&

.AVIATION...
18z TAFS: Another Pacific weather system will spread
precipitation over the area today. KEAT and KMWH won't see much if
any precipitation, but if it falls, it could be in the form of
very light snow/freezing rain/sleet. The KGEG/KSFF/KCOE area will
get snow for most of the day before warming toward rain this
evening. Snow intensities and resulting restrictions will bounce
around this morning with light snow but snow will pick back up
again late this afternoon evening just prior to the warm front
passage. Thereafter, thinking the warm air over snow will create a
period of IFR or LIFR conditions prior to the winds picking up
and improving vis and lifting cigs a few hundred feet. /sb


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane 34 34 40 34 41 30 / 100 40 20 90 100 80
Coeur d'Alene 33 33 40 34 40 31 / 100 80 60 100 100 90
Pullman 35 35 41 36 41 31 / 90 70 70 90 90 70
Lewiston 37 37 46 38 46 34 / 50 40 40 70 40 50
Colville 32 32 39 31 38 30 / 100 40 20 90 100 80
Sandpoint 32 32 38 32 38 31 / 100 90 80 90 100 100
Kellogg 31 31 36 33 37 30 / 100 90 90 100 100 90
Moses Lake 33 32 43 33 45 31 / 50 10 10 60 90 10
Wenatchee 33 32 41 32 40 29 / 30 20 20 50 70 20
Omak 32 32 37 31 38 28 / 30 30 20 60 80 50

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Winter Weather Advisory until 10 AM PST Monday for Central
Panhandle Mountains-Northern Panhandle.

Winter Weather Advisory until 10 PM PST this evening for Coeur
d'Alene Area.

WA...Winter Weather Advisory until 10 PM PST this evening for
Northeast Mountains.


&&

$$
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