Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 211843
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1043 AM PST Tue Feb 21 2017

.SYNOPSIS...The last in a series of wet weather systems will
impact the Inland Northwest today leading to a mix of rain and
snow. Cooler and showery weather is forecast for Wednesday and
continuing for the rest of the work. Drier but cooler weather is
forecast for the upcoming weekend.


&&

.DISCUSSION...

This morning, a shield of precipitation has brought rain to
south central and southeast Washington while areas along and north
of Interstate 90 have experienced a mix of rain and snow. With
temperatures in the low 30s, the Spokane/Coeur d`Alene area has
received up to 2 inches of wet accumulation with the most
significant accumulations generally above 2000 feet. For the
remainder of the afternoon, temps should nudge up a couple
degrees. Places below 2500 feet that have experienced snow this
morning may see a change to a rain/snow mix or predominant rain.
Accumulation on road surfaces will become less likely region wide
as the sun`s rays filter through our cloud cover. Even Lookout
Pass at 4700 feet will probably become wet or slushy during the
early to mid afternoon hours. Accumulations on roads will once
again become a concern this evening as the sun sets and colder air
wraps around our departing low. We may see an additional inch or
two of accumulation around Spokane, Coeur d`Alene, Rockford,
Sandpoint, and the high terrain around Moscow. We will be
monitoring radar and temperature trends, and may consider issuing
a Winter Weather Advisory for portions of the Idaho Panhandle.
Winter Driving Conditions tonight look like a good bet on I-90
around Lookout Pass and Fourth of July Pass. There may even be
some slick driving conditions over portions of Kootenai, Latah,
and Benewah counties this evening.

Snow levels are lower today than anticipated which has been an
nuisance for motorists, but precipitation in the form of snow is
good news for our flood prone areas. The Flood Watch has been
cancelled for Bonner, Pend Oreille, Stevens, and Ferry counties.
We may be able to discontinue the Flood Watch for counties in the
Columbia Basin too. The most significant precipitation shield
appears to be setting up to the south and east of Moses Lake and
Ritzville. /GKoch

&&

.AVIATION...
18Z TAFs: Precipitation intensity at Spokane and Coeur d`Alene is
expected to decrease a bit this afternoon as a compact surface low
moves out of southeast Washington into the Idaho Panhandle. The
decrease in intensity combined with a bit of afternoon warming
should produce a mix of precipitation type for a few hours this
afternoon at KGEG, KSFF, and KCOE. However, a change back to
predominant snow will likely occur in the 00z-02z time frame as
the sun sets, and colder air wraps around the departing low. Low
stratus will likely linger at Spokane, Coeur d`Alene, and
Sandpoint well after precipitation ends as mild dewpoints in the
Columbia Basin are blown upslope courtesy of light southwest winds
tonight into Wed morning. /GKoch


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        36  25  36  21  35  19 / 100  70  30  10  10  10
Coeur d`Alene  36  27  36  19  35  18 /  90  90  40  20  20  10
Pullman        41  29  38  21  36  21 / 100  90  30  10  30  20
Lewiston       44  33  43  27  41  26 /  90  80  30  10  20  20
Colville       37  23  38  21  37  19 /  30  20  30  20  20  10
Sandpoint      36  28  36  21  35  18 /  80  60  40  20  20  20
Kellogg        35  27  36  22  34  20 /  90 100  70  30  40  20
Moses Lake     39  23  37  20  36  20 /  70  20  10  10  10  10
Wenatchee      37  25  37  21  34  20 /  50  10  20  10  10  10
Omak           40  22  36  20  34  19 /  20  10  20  10  10  10

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Flood Watch through Wednesday afternoon for Central Panhandle
     Mountains-Coeur d`Alene Area-Idaho Palouse.

WA...Flood Watch through Wednesday afternoon for Moses Lake Area-
     Spokane Area-Upper Columbia Basin-Waterville Plateau.

&&

$$



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