Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 220413
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
813 PM PST Sat Jan 21 2017

.SYNOPSIS...
Periods of light rain and snow are expected this weekend over the
Inland Northwest. Our temperatures through the weekend will be
relatively mild with afternoon readings in the 30s and low 40s. A
drier and cooler weather pattern is expected next week with the
possibility of deteriorating air quality as the week wears on.


&&

.DISCUSSION...
Evening update: Forecast updates this evening include raising snow
levels and lowering or removing valley snow amounts. Surface
observations around the region indicate most lowlands are
currently in the mid 30s with precipitation reported as rain or
very wet snow. This is confirmed on the dual pol radar which
suggest the current melting layer is between 2500-3500 ft AGL
over Spokane. The air mass is cooler closer to the Cascades and
into the northern mountain valleys where surface observations
would place it closer to 1500-1800 ft. As such we will expect
little to no snow accumulations with tonight`s activity below 2000
feet and up to an inch in the mountains and . Precipitation will
cool the layer some and we do anticipate some clearing behind
tonight`s band of precipitaiton in the lower Basin close to
sunrise which raises some concern for temperatures to briefly dip
near freezing and potential for black ice. Not a slam dunk by any
means given the modified warmer and wetter air mass now in place
but something to consider if heading out early in the morning. /sb

&&

.AVIATION...
00Z TAFS: An upper level low off the Pacific coast will send two
waves of moisture along a pair of occluded fronts form southwest
to northeast through the forecast area. The first wave will pass
through tonight. This wave will be the weaker of the two but still
likely produce MVFR ceilings and vis in -SN at all TAF sites. A
period of IFR conditions between systems is probable especially
at the KGEG area TAF sites where low level flow will favor
upslope stratus Late tonight and Sunday morning...while KPUW and
KLWS will benefit from downslope easterly winds minimizing the
stratus threat. The second and stronger wave will move through on
Sunday late morning through the afternoon with more MVFR or IFR
conditions especially at the KMWH and KEAT TAF sites where upslope
flow into the Cascades will enhance lift along the front. /MJF



&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        31  37  26  32  21  30 /  60  90  80  10  20  10
Coeur d`Alene  31  36  25  34  22  31 /  60  70 100  10  30  20
Pullman        33  38  26  33  23  30 /  30  90  50  10  30  30
Lewiston       32  41  28  35  26  34 /  20  50  20  10  30  30
Colville       31  35  30  33  20  29 /  60  60 100  20  20  10
Sandpoint      29  35  26  33  22  31 /  60  30  90  10  30  20
Kellogg        29  33  26  31  22  29 /  60  50 100  10  30  40
Moses Lake     31  35  27  33  19  30 /  50 100  10  10  10  10
Wenatchee      31  35  26  31  21  28 /  80 100  10  10  10  10
Omak           31  34  28  33  19  30 /  80 100  80  10  10  10

&&

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

$$



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