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Area Forecast Discussion (AFD)

Issued by Spokane, WA (OTX)

                            
000
FXUS66 KOTX 091856
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1056 AM PST Sun Dec 9 2018

.SYNOPSIS...
Bands of light snow are expected to develop over central 
Washington this afternoon and spread across eastern Washington 
into north Idaho tonight. Most of the Inland Northwest should 
receive less than an inch of snow by Monday morning. More 
significant snow accumulations are expected Tuesday into 
Wednesday with heavy mountain accumulations and the potential for 
lowland snow as well.


&&

.DISCUSSION...
Rest of today...The cold front which will be the focus of our 
weather during the next 24 hours is slowly moving onto the coast 
and spreading widespread precipitation over western Washington
this morning. This precipitation shield is expected to track into
the north Cascades later this afternoon, but until that time, the
main weather focus will revolve around the threat of light snow or flurries
mainly over north-central portions of Washington. This area of
light snow is primarily a result of a saturated air mass below 
5-6k feet combined with weak isentropic or orographic ascent
associated with light southerly winds. Anything more than a half 
inch of snow is not expected at this time. Elsewhere we expect to
see an increasing cloud trend through the day with dry conditions
and seasonable temperatures of highs in the 30s.

&&

.AVIATION...
18Z TAFs: VFR conditions are expected to persist through the
daylight hours at all TAF sites ahead of an approaching cold
front, however once the front arrives that will all change.
Precipitation will likely begin around 23z or so in EAT and then
in MWH a few hours. Both sites should see light snow and MVFR
conditions developing fairly rapidly and persisting through early
Monday morning. Once the precipitation ends we have moderate
confidence that it will be followed by IFR cigs. Snowfall amounts
at both sites will be around an inch or less. Farther east,at the
remaining sites, the precip will between 08z-10z and consist of
all snow except at LWS where there could be a mix of rain and
snow. Like the previous TAF sites, conditions will rapidly fall 
into the IFR/MVFR range and continue into the morning. The threat
of precipitation will begin to decrease by early to late morning
but we have moderate confidence it will be followed by low 
stratus and IFR conditions. Snow amounts will be less than an 
inch at all sites. fx


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        35  29  34  28  35  31 /   0  50  30  10  80 100 
Coeur d'Alene  37  29  35  29  35  31 /   0  50  50  10  70 100 
Pullman        38  30  36  28  36  33 /   0  50  50  20  40 100 
Lewiston       41  32  42  29  40  35 /   0  40  40  10  20  90 
Colville       36  27  37  27  34  29 /   0  70  40  10  90 100 
Sandpoint      36  28  34  29  34  30 /   0  70  80  30  80 100 
Kellogg        37  28  34  29  33  30 /   0  50  80  40  40 100 
Moses Lake     34  24  35  25  36  28 /  10  40  10   0  70  50 
Wenatchee      33  28  37  28  36  29 /  40  80  10   0  60  50 
Omak           35  26  37  27  32  27 /  30  70  10  10  60  60 

&&

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

&&

$$