Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 161833
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1033 AM PST Sat Dec 16 2017

.SYNOPSIS...
After a dry but cloudy Saturday, another weather system will bring
more snow on Sunday. A warm and wind weather system will arrive on
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: Snow has exited the region. A drier northwest flow
is delivering sunshine across the northern mountains. Slightly
different picture for the Cascades which is being infiltrated by
mid and high level moisture as the next storm system approaches
the coast. Meanwhile, valleys are plugged with low clouds. On the
higher benches, these low clouds are touching the ground resulting
in dense fog. I think we will see some clearing of the low clouds
around the Northern Valleys and East Slopes but confidence is low.


&&

.AVIATION...
18z TAFS: All terminals experiencing IFR stratus this morning.
Expect cigs to lift a little later this afternoon. There is a
drier NW flow above the boundary layer but confidence is low how
much this can erode the low clouds. Based on regional cams,
thinking KEAT will stand the best shot for this to break up. Cigs
to lower again this evening but boundary layer winds do start to
increase from the south tonight ahead of the next storm system.
This could lead to some clearing from south to north for locations
like KLWS, KPUW, KMWH, KEAT. Otherwise, top down moistening to
bring -SN to the terminals 10-14Z. Very little precipitation
expected for KMWH/KEAT so went with vcsh but these areas may see
brief mix of sleet/freezing rain with only trace amounts. /sb


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        29  26  34  32  37  33 /   0  20  70  40  20  60
Coeur d`Alene  30  26  34  32  38  33 /   0  20  70  70  40  80
Pullman        29  25  34  34  39  35 /   0  10  40  60  60  60
Lewiston       33  27  37  36  45  37 /   0  10  30  50  30  40
Colville       32  26  32  29  36  30 /   0  40  80  50  10  60
Sandpoint      33  26  32  30  37  31 /   0  30  90  90  50  80
Kellogg        26  23  31  30  35  32 /   0  10  70  90  80  90
Moses Lake     33  29  35  30  40  33 /   0  30  20  10  10  30
Wenatchee      33  28  33  30  39  32 /   0  20  30  10  20  40
Omak           32  28  32  29  35  30 /   0  40  50  10  10  50

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...None.

&&

$$



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