Area Forecast Discussion
Issued by NWS Spokane, WA

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000
FXUS66 KOTX 111612
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
812 AM PST Mon Dec 11 2017

.SYNOPSIS...
Strong high pressure will persist through Thursday. The lowlands
of eastern Washington and north Idaho will continue to be covered by
low clouds while the mountains remain mild and mostly clear.
Chances for wintry precipitation increase late Thursday night
into Friday. Unsettled weather expected through next weekend.

&&

.DISCUSSION...
Morning update: Northeast pressure gradients are slightly stronger
this morning compared to yesterday over NE Washington into the
Idaho Panhandle which has allowed the stratus to erode a bit more.
Update to lower sky cover this morning in a few locations. The
clearing this morning has allowed temperatures to drop into the
teens in places like Deer Park, Sandpoint, and Bonners Ferry.
Meanwhile the inversion layer has lowered over the Spokane area
resulting in a slightly colder start to the day compared to
yesterday. Will be monitoring temperature trends this morning and
may need to lower high temperatures in a few areas.

Web cameras show the most extensive area of freezing fog this
morning in the 2000 to 3500 foot elevation layer over SE
Washington and the Lewiston area. This includes Alpowa Summit and
Pullman. Easterly gradients should allow the fog and stratus to
retreat to the west and with web cameras showing some sunshine in
Moscow this morning should see this clearing poke into parts of
the palouse in Washington.  JW

&&

.AVIATION...
12Z TAFS: The same challenges as the last couple of days
continue under a stable ridge of high pressure. All TAF sites
have a fairly predictable stratus deck with diurnal fluctuations.
The outlier is KPUW and now KLWS that broke out during the day and
then had the stratus/fog move back in during the evening.
Continued this trend for the first 12 hours. Models indicating
that IFR visibility restrictions could be making a return late
Monday night. Hinted at this in KMWH, KGEG, KSFF, and KCOE during
the last 9 hours of the TAF. /AB


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        31  27  31  27  31  27 /   0   0   0   0   0   0
Coeur d`Alene  32  26  32  28  32  28 /   0   0   0   0   0   0
Pullman        32  23  34  23  34  23 /   0   0   0   0   0   0
Lewiston       35  25  35  25  35  25 /   0   0   0   0   0   0
Colville       32  28  31  28  31  28 /   0   0   0   0   0   0
Sandpoint      34  17  33  17  33  17 /   0   0   0   0   0   0
Kellogg        29  19  31  19  31  19 /   0   0   0   0   0   0
Moses Lake     32  30  33  30  33  30 /   0   0   0   0   0   0
Wenatchee      32  29  32  29  32  29 /   0   0   0   0   0   0
Omak           32  30  32  30  32  30 /   0   0  10   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Air Stagnation Advisory until noon PST Thursday for Central
     Panhandle Mountains-Coeur d`Alene Area-Idaho Palouse-Lewis
     and Southern Nez Perce Counties-Lewiston Area-Northern
     Panhandle.

WA...Air Stagnation Advisory until noon PST Thursday for East Slopes
     Northern Cascades-Lower Garfield and Asotin Counties-Moses
     Lake Area-Northeast Blue Mountains-Northeast Mountains-
     Okanogan Highlands-Okanogan Valley-Spokane Area-Upper
     Columbia Basin-Washington Palouse-Waterville Plateau-
     Wenatchee Area.


&&

$$


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