Area Forecast Discussion
Issued by NWS Spokane, WA

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758
FXUS66 KOTX 241755
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
955 AM PST Fri Feb 24 2017

.SYNOPSIS...
A cool and unsettled pattern will continue over the Inland NW
right into the weekend and into early next week. The main
precipitation threat will be mainly mountain based snow showers,
but a stronger system on Sunday may bring  snow accumulations to
the valleys and Basin. Temperatures will be cooler than normal for
this time of year with overnight lows in the teens and 20s and
daytime highs only in the 30s. A gradual warm up is forecast by
the middle of next week.


&&

.DISCUSSION...
Update: A weak mid level wave combined with instability associated
with cold air aloft with 500mb temperatures down to -35C has
allowed an expansion of snow showers across the Spokane area this
morning. Models show this weak wave slowly tracking east into the
afternoon...which combined with daytime heating will lead to an
increase in snow showers for the Idaho Panhandle while snow
showers continue for the Spokane area into early afternoon before
decreasing as this wave moves east of the area. For the rest of
the area generally dry weather is expected except for isolated
snow showers mainly over the mountains due to steepening lapse
rates in the afternoon from daytime heating.  JW

&&

.AVIATION...
18Z TAFs: A weak mid level wave combined with instability will
result in continued showers for KGEG/KSFF/KCOE into the
afternoon. Isolated moderate to heavy snow showers may reduce
visibility to a half mile through 19z. A continued moist boundary
layer from these showers will lead to MVFR conditions and then
with the loss of daytime heating this evening and some drying in
the boundary layer VFR conditions should return. However boundary
layer becomes nearly saturated again early Saturday morning so
stratus should redevelop. For KLWS/KEAT/KMWH VFR conditions are
expected to continue through 18z Saturday.  JW

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        34  19  33  24  34  22 /  40  10  10  60  80  60
Coeur d`Alene  34  16  33  23  34  21 /  30  10  10  60  80  60
Pullman        35  21  35  25  36  24 /  20  10  10  60  80  60
Lewiston       39  25  40  28  41  28 /  10  10  10  30  60  60
Colville       35  16  34  24  35  20 /  20  10  10  60  60  20
Sandpoint      33  17  33  23  33  20 /  30  10  20  60  60  40
Kellogg        32  19  32  24  33  23 /  20  10  40  60  80  60
Moses Lake     38  17  36  25  36  23 /  10   0   0  30  40  30
Wenatchee      39  17  34  24  35  22 /  10  10   0  40  50  20
Omak           35  17  33  24  34  22 /  10  10   0  60  50  20

&&

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

$$



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