Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 270413
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
813 PM PST Sun Feb 26 2017

.SYNOPSIS...
Occasional snow will continue through Tuesday. The most
significant accumulations will likely occur over the Palouse and
Idaho Panhandle the next couple of days. A windy and milder
weather pattern is expected for Wednesday into the weekend.
Precipitation over the second half of the week will likely
transition to low elevation rain and high elevation snow.

&&

.DISCUSSION...
Evening update: A surface boundary remains draped across
Southeastern WA and the lower Idaho Panhandle with an accompanying
very weak 850-700mb low nearing the Montana border. The most
persistent snow, albeit light in nature is south of a line
stretching from the Blue Mountains, across the Palouse, and
toward Lookout Pass including the Camas Prairie. We are also
seeing scattered snow showers along and immediate north of I-90
from Prichard in northern Shoshone County to Cd`A to north Spokane
west into Lake Roosevelt. The entire cyclonic circulation of snow
activity is slowly drifting east as the midlevel low shifts into
Montana. Drier northerly winds have developed in the Okanogan
Valley and will continue to end any threat of snow south toward
Moses Lake and into reaches of the Okanogan Highlands.
Unfortunately, the drier air will not make it into SE WA and NC
Idaho, suggesting snow is far from over.

Overnight, a second wave between Walla Walla and Pendleton will
skirt the Blue Mtns and Camas Prairie overnight renewing the
threat for moderate snow intensities. Snow with snow possibly
expanding as far north as Lewiston and Pullman but general amounts
should be light. A stronger wave drops into WA from the BC Coast
Monday with light snow expanding across much of Ern WA and N ID.
Once again impacts will be minimal with any snow during the
afternoon given the late Feb sun angle however 00z NAM/GFS
continue to show a surface low with this feature crossing the
Palouse and Idaho Panhandle Monday night delivering bands of
heavier snow. Timing is favorable for snow accumulations on roads
and narrow east to west bands will bring the potential for QPF
amounts of 0.25-0.45" equating to 3-6 inches of snow. The new NAM
places this just south of the Spokane-Cd`A metro areas with the
GFS similar yet more widespread south into Potlatch and Clarkia.
/sb

&&

.AVIATION...
00z TAFs: There will be a decreasing trend in precipitaiton this
evening from north to south, and affecting the KGEG-KCOE area and
KEAT. Expect MVFR cigs and vsbys with snow and fog slowly
improving this evening, although there is the potential for more
fog reforming especially in the KGEG area toward morning.
Scattered snow showers will increase over the KGEG-KCOE corridor
by midday Monday. Looks like northerly winds will keep KMWH on
the drier side and should see improving conditions. KPUW and KLWS
will be under the area of persistent snow overnight and into
Monday with the surface boundary staying near this area. Expect
mainly IFR conditions. KLWS may see a rain/snow mix early this
evening and again tomorrow afternoon. /rfox.


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        24  31  18  32  26  42 /  30  50  50  10  20  40
Coeur d`Alene  22  32  18  32  25  40 /  50  70  70  20  40  50
Pullman        26  32  22  34  29  44 /  70  80  80  60  50  30
Lewiston       31  38  26  41  33  50 /  70  60  60  60  20  30
Colville       21  33  16  34  23  43 /  10  40  40  10  20  30
Sandpoint      22  32  18  32  23  40 /  20  70  70  20  70  80
Kellogg        24  31  21  31  23  38 /  90  90  90  70  80 100
Moses Lake     24  34  17  36  25  48 /  10  30  30  10   0  10
Wenatchee      25  32  16  35  26  46 /  10  30  30  10  10  20
Omak           22  30  13  32  23  42 /  10  20  20  10  20  30

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Winter Weather Advisory until 10 AM PST Tuesday for Central
     Panhandle Mountains-Idaho Palouse-Lewis and Southern Nez
     Perce Counties.

WA...Winter Weather Advisory until 10 AM PST Tuesday for Northeast
     Blue Mountains-Washington Palouse.

&&

$$


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