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Area forecast discussion 
National Weather Service Spokane Washington
1019 PM PST Sat Jan 31 2015

Synopsis...
a frontal system will bring light snow to much of the region on
Sunday. Another front is expected on Monday, and it should bring
rain and mountain snow. More warm and wet weather disturbances are
expected next Thursday through Saturday to end the nest work
week.



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Discussion...
no updates were made to the forecast for tonight. The next Pacific
storm system is still on track to push across the region on
Sunday. Radar is already picking up some weak echoes over the
Cascade mtns, over the Okanogan Highlands/valley and into the
western basin. I have not found any ground truth to suggest that
this moisture is reaching the surface. Our afternoon sounding
shows a good amount of dry air that needs to be overcome between
850 and 500 mbs. The main tweak I made to the forecast was to
delay the onset of precip across the eastern half of the forecast
area a little bit. It still looks like that snow will hold off
over the Panhandle for the most part until at least the late
morning hours and then pick up in the afternoon. I only made some
small adjustments to the snow amounts based off of the 00z runs of
the NAM and GFS. No changes will be made to the winter weather
advisories that will go in effect on Sunday. /Svh



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Aviation...
06z tafs: a Pacific storm system is beginning to push into the
region this evening. Satellite imagery shows a mid to upper level
cloud shield moving into the region. These high clouds is making
it difficult to track the current stratus layer over the region.
The trend is for these low clouds to break up from east to west
across the Panhandle into the basin as drier easterly winds pick
up tonight. The atmosphere will then begin to moisten from the top
down late tonight into Sunday morning with light snow expected at
keat, kgeg, ksff, kcoe and kpuw. Expect cigs and vis to degrade
through the morning on Sunday and continue into Sunday afternoon
with IFR conditions possible. /Svh



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Preliminary point temps/pops...
Spokane 30 32 31 38 32 39 / 10 100 50 70 50 20
Coeur D'Alene 30 32 31 39 34 40 / 10 100 70 80 60 30
Pullman 30 36 34 44 37 45 / 10 90 70 70 60 30
Lewiston 33 41 37 49 39 49 / 10 60 50 50 50 20
Colville 31 34 31 35 31 36 / 10 100 40 60 40 20
Sandpoint 32 33 30 36 32 37 / 10 90 70 70 60 30
Kellogg 30 34 32 39 34 39 / 10 100 100 90 90 60
Moses Lake 34 38 31 41 33 44 / 10 30 10 50 10 10
Wenatchee 33 38 33 40 33 42 / 30 50 10 60 20 20
Omak 32 34 30 37 31 36 / 50 70 10 60 20 10

&&

Otx watches/warnings/advisories...
Idaho...Winter Weather Advisory from 10 am Sunday to midnight PST Sunday
night for central Panhandle mountains-Coeur D'Alene area-
northern Panhandle.

Washington...Winter Weather Advisory from 7 am to 7 PM PST Sunday for
northeast mountains-Okanogan Highlands-Spokane area.

&&

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