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fxus66 kotx 280629 
afdotx

Area forecast discussion
National Weather Service Spokane Washington
1029 PM PST Mon Feb 27 2017

Synopsis...
a swath of moderate to heavy snow will be possible tonight over
north Idaho and eastern Washington with a quick moving upper level
disturbance. 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...
the surface low circulation is located between the Moses Lake area
and Spokane area at around 10:00 PM this evening. Snow for the
rest of tonight will continue to be heaviest across the central
Panhandle mtns due to the combination of isentropic ascent and
favorable orographics. These areas will see an additional 3 to 6
inches in the valleys and 4 to 8 inches in the mountains. Low
level convergence into the low pressure center will also result in
snow across the Coeur D'Alene area, northern Panhandle and
northeast mtns with around 2 to 4 inches possible into Tuesday
morning. Lighter snow amounts are expected out into the Washington Palouse
and Spokane area up to an additional 2 inches possible.

The low will move into western Montana during the morning hours on
Tuesday. Upslope flow into the central Panhandle mtns will keep
snow showers going through the morning. Low level winds will also
shift more west-northwesterly across the Camas Prairie, which
will be a bit more favorable for snow showers to continue across
this area as well. The current highlights look valid and no
changes will be made this evening. Some areas may be able to come
down early during the late overnight hours over portions of
extreme eastern Washington. /Svh

&&

Aviation...
06z tafs: snow will be focused over the northeast mtns of Washington and
into the Idaho Panhandle through the rest of the evening and into the
early overnight hours. The low pressure center will track into
western Montana late tonight. This will result in snow tapering off
across extreme eastern WA, but snow showers will likely continue
over the central Panhandle mtns through the morning hours on
Tuesday. The kgeg, ksff, kcoe and kpuw taf sites will see IFR
cigs/vis with snow this evening then transition to a low stratus
with IFR cigs through the morning hours. There should be enough
downsloping off of the northeast mtns that conditions will remain
VFR at klws. Enough dry air is expected to keep kmwh and keat VFR,
but a few low clouds cannot be completely ruled out. /Svh

&&

Preliminary point temps/pops...
Spokane 21 33 29 43 30 40 / 90 20 50 20 20 60
Coeur D'Alene 22 34 28 42 29 40 / 100 40 50 50 30 60
Pullman 25 35 32 45 33 43 / 100 50 40 30 20 40
Lewiston 30 43 34 50 35 48 / 60 40 10 10 20 20
Colville 16 34 24 43 28 43 / 50 10 60 20 20 40
Sandpoint 22 34 29 40 30 40 / 90 60 80 80 60 60
Kellogg 23 33 29 39 31 39 / 100 90 90 100 90 80
Moses Lake 20 38 31 50 32 46 / 10 0 10 10 10 20
Wenatchee 22 37 31 50 31 43 / 10 0 10 10 10 20
Omak 17 34 26 44 25 42 / 10 0 10 10 10 30

&&

Otx watches/warnings/advisories...
Idaho...Winter Weather Advisory until 7 am PST Tuesday for northern
Panhandle.

Winter Storm Warning until 10 am PST Tuesday for central
Panhandle mountains.

Winter Weather Advisory until 10 am PST Tuesday for Lewis and
southern Nez Perce counties.

Winter Storm Warning until 7 am PST Tuesday for Coeur D'Alene
area-Idaho Palouse.

Washington...Winter Weather Advisory until 7 am PST Tuesday for northeast
mountains-Spokane area-Washington Palouse.

Winter Weather Advisory until 10 am PST Tuesday for northeast

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