[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

Western Washington

FXUS66 KSEW 171753

Area Forecast Discussion
National Weather Service Seattle WA
953 AM PST Sat Feb 17 2018

.SYNOPSIS...Windy conditions and heavy mountain snow are expected
today as a deepening surface low tracks southeast past Vancouver
BC and across northern Washington. A modified arctic cold front 
will move southward through Western Washington early Sunday, 
bringing the possibility of lowland snow and strong north winds. 
Dry conditions are expected from late Sunday through Tuesday with 
cold temperatures remaining in place. Another system could slide 
in from the northwest around next Wednesday or Thursday.


.SHORT TERM...Active weather is underway, with the main impacts
today coming in the form of strong wind and heavy mountain snow. 

An elongated 998 mb low is currently located squarely over central
or northern Vancouver Island, moving southeast-east. It is
expected to make its closest approach to Western Washington as it
passes Vancouver B.C. later today as a 995 mb low. Interesting to
see a southeast moving low with a baroclinic leaf signature on
satellite imagery, which is a classic signature of
intensification. The PDX-BLI gradient is expected to peak near +12
mb early this afternoon, HQM-SEA around +4.5 mb, and UIL-BLI
around +4.5 mb. Southwest winds are already picking up and will
peak in most areas early this afternoon, though westerlies down
the Strait will peak later this afternoon. Current coverage of
Wind Advisories looks good, with those covered areas looking for
gusts of 45+ mph. Expect scattered power outages and minor tree

Mountain snow is the other big deal today. Heavy snow is already
underway, with snowfall rates of 1-2 inches per hour being
observed over the Cascades. WSDOT reports I-90 closed currently
eastbound across Snoqualmie Pass. The latest 24-hour snowfall 
forecasts (ending at 4 AM Sunday) based on 12z model data are for
19 inches at Snoqualmie Pass and 25 inches at Stevens. With heavy
snow and strong wind in the mountains, NWAC has issued an
Avalanche Warning for the Cascades today. Pack your patience and
an emergency supply kit if traveling through the mountains, and
stay in bounds if recreating.

The fun does not end today. In the wake of today's low center, a
a continental polar air mass will quickly spread south through 
interior B.C. and come pouring out of the Fraser later tonight. 
The BLI-CYWL gradient is forecast to peak near -20 mb on Sunday 
morning, making this a strong Fraser Outflow event. Strong north- 
northeast winds will ensue, most notably near Bellingham and the 
San Juans, but other places will be breezy as well. The uncommonly
breezy wind for the normally less breezy north direction will 
have greater tree impacts than a similar south wind. A modified 
arctic front will spread south and southwest through Western 
Washington on Sunday morning, with localized frontal convergence 
and orographic lift leading to some lowland snow accumulations. 
The average forecast snowfall up and down the I-5 corridor is 
about 1 inch. In reality, some places, especially in the Seattle 
metro area will see little or none, while other places could see a
couple of inches. 

The front will be followed by the coldest air mass of this winter.
A hard freeze is expected areawide on Sunday night, with Monday
night likely being the coldest night of the upcoming cold spell.
At least the cold will come with drier weather. The last showers
will taper off over the Cascades on Sunday night, with dry weather
expected Monday and Monday night. Haner

.LONG TERM...From Previous Discussion: No major changes to the 
inherited forecast. There were some difference in the details 
concerning the medium range solutions. The operational ECMWF 
indicated an upper level low dropping into the area from the north
about the middle of next week while the GFS kept us more under 
the influence of the offshore ridge. Beyond this period, the 
models began to diverge even more. At any rate, it looks, for the 
most part, temps and precip will be below normal during this 


.AVIATION...A vigorous frontal system is moving through the 
region this morning. The associated low pressure center is over 
Vancouver Island this morning. Rain and areas of fairly low cigs 
will give way to showers as the front moves through the I-5 corridor 
by midday. It will be windy with strong onshore flow that eases 
overnight quickly then picks back up as it turns to a north wind.

KSEA...Rainy at times this morning then turning to scattered showers 
by midday with some clearing periods in rather blustery weather. 
Timing the modified arctic front and the switch to northerly winds 
Sunday morning was currently timed for 17z Sunday, but obviously we 
will look at the mesoscale models closely and that could be off by a 
few hours. Also, the snow level will be falling to Sea-Level Sunday 
morning, so we will look to the mesoscale models for guidance on 
that as well--it would not be unusual for an inch or two of snow to 
fall quickly as the modified arctic front moves through the metro 
area Sunday morning. Currently the TAF shows no precip, but a tempo 
SHSN for a couple hours seems like a good idea for the 18z TAF with 
that switch to north winds.


.MARINE...A 995mb low will move to near the city of Vancouver this 
afternoon. As the vigorous frontal system moves inland and the low 
pressure falls with it, Washington state will be left with residual 
slowly weakening low pressure on Sunday, with cold high pressure 
moving south out of B.C. and forcing the residual low pressure 
southward. The modified arctic front will be moving south through 
Western Washington and the blustery southerly and westerly gales 
today will be giving way to Fraser outflow northeasterly gales 
before daybreak Sunday--and probably spreading down into the Port 
Townsend to Port Angeles area pretty quickly. The switch to 
northerly winds in Puget Sound will probably be around mid morning 
and Sunday will be a raw brisk day.


.HYDROLOGY...River flooding is not expected the next 7 days.


WA...Wind Advisory until 6 PM PST this evening for Bellevue and 
     Vicinity-Bremerton and Vicinity-Central Coast-Hood Canal 
     Area-North Coast-Seattle and Vicinity-Southwest Interior-
     Tacoma Area.

     Winter Storm Warning until 6 AM PST Sunday for Cascades of 
     Pierce and Lewis Counties-Cascades of Snohomish and King 
     Counties-Cascades of Whatcom and Skagit Counties.

     Wind Advisory from midnight tonight to 6 PM PST Sunday for 
     Western Skagit County-Western Whatcom County.

     Winter Weather Advisory until 10 AM PST Sunday for Olympics.

     Wind Advisory until 6 PM PST Sunday for San Juan County.

     Winter Storm Watch from this evening through Sunday morning for 
     Eastern Strait of Juan de Fuca.

     Wind Advisory until 6 PM PST this evening for Admiralty Inlet 
     Area-Eastern Strait of Juan de Fuca.

PZ...Small Craft Advisory for rough bar until 4 PM PST Sunday for 
     Grays Harbor Bar.

     Gale Warning until 3 AM PST Sunday for Coastal Waters From Cape 
     Flattery To James Island Out 10 Nm-Coastal Waters From 
     James Island To Point Grenville Out 10 Nm-Coastal Waters 
     From Point Grenville To Cape Shoalwater Out 10 Nm.

     Gale Warning until 4 PM PST Sunday for Coastal Waters From Cape 
     Flattery To James Island 10 To 60 Nm-Coastal Waters From 
     James Island To Point Grenville 10 To 60 Nm-Coastal Waters 
     From Point Grenville To Cape Shoalwater 10 To 60 Nm.

     Gale Warning until 4 PM PST Sunday for Central U.S. Waters 
     Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of 
     Juan De Fuca-Northern Inland Waters Including The San Juan 

     Gale Warning until 3 AM PST Sunday for Admiralty Inlet-Puget 
     Sound and Hood Canal-West Entrance U.S. Waters Strait Of 
     Juan De Fuca.




[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

Southwestern Washington and Western Oregon

FXUS66 KPQR 171742 AAA

Area Forecast Discussion
National Weather Service Portland OR 
942 AM PST Sat Feb 17 2018

Updated Aviation section.

.SYNOPSIS...A quick but hard hitting series of weather systems will 
drop south through the Pacific NW through Mon bringing rain, winds, 
heavy mountain snow, and colder weather with lowering snow levels. 
By Mon a shot of arctic air will bring the coldest air mass of year 
to the region. Below normal temperatures are likely to persist well 
into next week if not longer.


.SHORT TERM...Tonight through Monday...A series of shortwaves in an 
increasingly northerly flow aloft will move through the region today 
through Sun night.  the first shortwave, seen in water vapor 
pictures off the SE AK and northern BC coast will swing across WA 
today, and push a cold front across the forecast area early this 
afternoon. This is a pretty dynamic system, with westerly 850 mb 
winds peaking around 45 kt today, causing windy conditions in the 
mountains today and continuing into tonight. Breezy conditions also 
likely in the Willamette and Lower Columbia Valleys as surface 
pressure gradients peak around 6 or 7 mb. Ahead of the front, 
moisture is deep, but air mass will also warm further, driving snow 
levels above 5000 ft before the front moves through. Dynamics and 
moisture result in categorical pops across the area today, then 
precipitation will become more orographically driven tonight as air 
mass turns more showery and flow turns to the nw.

Models agree on moving the next shortwave south across the region 
Sun with a continuation of good low level moisture to fuel showers. 
This will keep pops categorical over mountains, and bring pops back 
to likely or better in the valleys. Air mass continues to become 
progressively cooler, with 850 mb temps dropping into the range of -
6 to -8c Sun afternoon. This brings snow levels down to 1000 ft or 
possibly a little lower Sun. Heaviest snowfall potential for the 
Cascades remains from Sat through Sun. As snow levels fall, Coast 
Range and Cascade Foothills by Sun appear likely to need to 
advisories for snow, and there is a chance that advisories may also 
be needed at lower elevations as well, but it is still a little 
early to make that call.

More weaker shortwaves, with arctic origin turn the flow aloft to 
the north Sun night and early mon, and bring in what is likely the 
coldest air of the winter, with 850 mb temps down to -10 to -12C by 
Mon morning. The onshore flow weakens further, and may turn a little 
offshore by Mon. Except for some lingering snow showers over the 
Cascades, showers will likely come to an end Mon, but not before at 
least a chance for some light accumulations down to the Valley 
floors Sun night. This includes a chance for snow showers all the 
way out to the coast. With the forecast 850 mb temps, lows in the 
20s will be the norm Mon morning, and high temps will struggle to 
get out of the 30s.

.LONG TERM...No Changes. Previous discussion follows...Monday night
through Friday...Cold weather to continue through midweek, with
overnight lows in the Willamette Valley and along the coast in the
low to mid 20s, and daytime highs in the upper 30s to near 40. 

ECMWF continues to show a low sliding down the coast on Tuesday, 
though it now is coming in Tuesday evening. The GFS continues to 
show a low much farther offshore. If the ECMWF proves true, there 
will be the potential for some snow along the coastline mainly late 
in the day on Tuesday. Will have another system drop down out of 
British Columbia on Wednesday, but low confidence in the details 
with this system because the ECMWF is now showing a defined low 
pressure system with more moisture, while the GFS continues to show 
a weak shortwave with limited moisture. The main concern if we do 
get a system like the ECMWF is showing is what track it will take 
coming down the Coast, with the potential for another round of low 
elevation snow, at least at the start.

Winds turn to light southerly winds behind this system on Thursday, 
which would allow us to bring temperatures back up closer to normal 
through the end of next week. -McCoy

.AVIATION...A cold front will reach the coast early this afternoon, 
then move across the interior through this evening. Expect low MVFR 
to IFR conditions with improving conditions after the cold front 
moves through. Coastal areas will likely have less improvement. 
Gusty S-SW surface wind will continue into tonight, with gusts as 
high as 30 kt for the interior and 40 kt at the coastal sites. 
Mountains will remain obscured.

PDX AND APPROACHES...MVFR with cigs around 1500 ft improving to VFR 
after around 22Z. South to southwest wind gusts near 30 kt expected 
thru 02Z Sun then slowly dropping off overnight. Bowen


.MARINE...Main update this morning was to seas, to delay the 
timing of mid to upper teens waves until 3-6 hours later, generally 
this evening instead of this afternoon. Also updated swell to show 
one swell out of the NW at about 14 seconds first thing today, being 
replaced by incoming fresh swell at about 9 seconds, as reflected in 
buoys 50 an d89 obs in the last hour. Not much change to winds. 

Gales arriving this morning as a strong low pressure system diving 
down along the British Columbia coast will slowly drop southeast 
over the interior late Sat and then slide south Sat night and Sun. 
Only PZZ255 may escape gales but there is a chance the northwest 
corner of this zone may have 35 kt gusts today. But expect it to be 
sporadic and of short duration. Models indicate wind speeds easing a 
bit Sat evening, but picking up again late Sat night. Solid gales 
expected over PZZ270 and PZZ275 late Sat night through much of 
Sunday so have extended the Gale Warning for these zones. The GFS 
spreads gale gusts into the inner waters Sun morning, but the NAM is 
a little weaker. Wind speeds will subside considerably from north to 
south Sun night into Mon as the low weaken and moves SE further 
inland. Much more benign conditions are expected for the first half 
of next week as higher pressure moves over the waters.

Seas steadily rise today in response to wind as well as incoming 
fresh swell. Seas will be  very choppy as fresh swell increases with 
period of around 9 seconds. ENP and ECMWF wave models show peak wave 
height during the day Sunday. Seas will likely be 22-24 ft seas over 
the outer waters and near 20 ft for the inner waters. Seas gradually 
subsiding Sun night then drop off rapidly Mon. Bowen/mh


OR...Winter Storm Warning until 7 AM PST Sunday for Northern Oregon 

     Winter Weather Advisory from 9 AM this morning to 4 PM PST 
     Sunday for Cascades in Lane County.

WA...Winter Storm Warning until 7 AM PST Sunday for South Washington 

PZ...Gale Warning until 8 PM PST this evening for Coastal waters 
     from Cape Shoalwater WA to Cascade Head OR out 10 NM.

     Gale Warning until 2 PM PST Sunday for Waters from Cape 
     Shoalwater WA to Cascade Head OR from 10 to 60 NM.

     Gale Warning from 6 AM this morning to 2 PM PST Sunday for 
     Waters from Cascade Head to Florence OR from 10 to 60 NM.

     Small Craft Advisory for Rough Columbia River Bar until 10 PM 
     PST this evening.

     Small Craft Advisory for winds until 4 PM PST Sunday for 
     Coastal waters from Cascade Head to Florence OR out 10 NM.

     Small Craft Advisory for hazardous seas from 9 AM this morning 
     to 10 AM PST Monday for Coastal waters from Cascade Head 
     to Florence OR out 10 NM.


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This discussion is for Northwest Oregon and Southwest Washington
from the Cascade crest to 60 nautical miles offshore. This area is
commonly referred to as the CWA or forecast area.

[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

Southeastern Washington and Northeastern Oregon

FXUS66 KPDT 171743

Area Forecast Discussion
National Weather Service Pendleton OR
943 AM PST Sat Feb 17 2018

.SHORT TERM...Today and tonight...An upper level trough is 
approaching the region with a warm front across Washington and 
northeast Oregon this morning. This will produce low elevation rain 
and snow above. The trough will push a fast moving cold front 
through the area late this afternoon and evening which will be 
accompanied by a strong upper level jet. These winds are expected to 
mix down to the surface producing some very strong winds to portions 
of the forecast area up to 10pm and then winds will gradually 
decrease overnight. Some of the wind advisories have been upgraded 
to high wind warnings. The Blue mountains have been placed under a 
high wind warning in addition to the winter storm warning. This 
could result in some blizzard like conditions in the Blue Mountains 
mainly above 4500 feet this afternoon and evening. Forecast has been 
updated to reflect these changes.  


.PREV DISCUSSION... /issued 402 AM PST Sat Feb 17 2018/ 

SHORT TERM...Today through Monday. Upper level trough moving
across the Pacific northwest today. This will bring rain and
mountain snow with significant accumulations for the Cascades and
Blues. Strong winds aloft associated with this system. Will
continue with wind advisories for a good portion of the forecast
area with highest winds expected during the afternoon and evening.
Potential for winds aloft to mix down at times which would result
in higher gusts to 50 mph. Precipitation and winds will diminish
overnight although steady snow will likely continue for the
Cascades and Blues with the westerly flow aloft. Another upper
level trough and cold front will then move south across the 
region Sunday. This is a much colder system and expect snow for
all locations later Sunday into Sunday night. Northerly flow
Monday with continued cold advection and snow showers over the
mountains. High temperatures today will be in the 40s and 50s
falling into the 20s and 30s Sunday and teens to 20s Monday. 

LONG TERM...Monday Night through Saturday...A deep upper trough 
will be over the area Monday night and an open wave will be 
departing to the east Monday night and Tuesday. This will shift the 
trough axis into Idaho by Tuesday afternoon. A few lingering snow 
showers will remain in eastern Wallowa county Monday evening but 
otherwise the forecast will be dry through Tuesday night. The main 
story will be cold air arriving on a northerly flow aloft. This will 
keep the coldest weather of the winter with us for a few days. 
Monday night will see temperatures of 5 to 15 in the lower 
elevations and 5 below to 5 above zero in the mountains. Tuesday 
will see temperatures in the upper 20s to mid 30s with mid teens to 
mid 20s in the mountains. Tuesday night will see some modest warming 
as the flow turns a little to the northwest with lows of 10 to 20 
and in the mountains lows of zero to 10 above. Wednesday afternoon 
through Thursday models show another wave moving into the area 
though they differ greatly in the details. The GFS has a fairly weak 
wave staying mostly to our north while the ECMWF has a much stronger 
wave that it sends right through our area with another shot of cold 
air. Took a middle ground for now and have a chance of snow in the 
mountains and a slight chance of mainly snow in the lower 
elevations as snow levels remain close to the surface. Moisture is 
limited so it does not appear that snow will be more than an inch or 
two even in the mountains. Thursday night through Saturday models 
are completely disagreeing with the GFS maintaining a progressive 
northwesterly flow with a series of embedded disturbances. The ECMWF 
has a transitory ridge over the area Thursday night and Friday 
before another deep and cold low arrives Friday night and Saturday.
Have kept a chance of snow in the mountains for Thursday night 
through Saturday with a slight chance of snow in the lower elevation 
with some rain mixed in in the Columbia Basin. Temperatures 
Wednesday and Thursday will be in the mid 30s to lower 40s with 
upper 20s and 30s in the mountains. Warming will continue Friday and 
Saturday with highs in the mid 40s to lower 50s in the lower 
elevations and in the mid 30s to lower 40s in the mountains. Perry 

AVIATION...12Z TAFs...A strong system will move across the area 
today bringing lower elevation rain and mountain rain and snow. 
Tonight will see the lower elevation rain taper off at TAF sites 
this evening but snow will continue in the mountains tonight. Cloud 
cover at TAF sites will be mainly broken to overcast with low end 
VFR/MVFR ceilings today. Tonight will see skies become scattered to 
broken above 4000 feet AGL. Winds will be the big story today as 
winds will increase rapidly this morning and by 21Z all Columbia 
Basin TAF sites will reach 25 to 35 kts with gusts to 45 kts. KRDM 
and KBDN will reach 20 to 30 kts with gusts to 40 kts. Winds aloft 
at 850 MB (around 5000 feet) this afternoon will be 50 to 65 kts so 
the potential for even stronger winds is there but believe that 
those winds will not fully mix down to the surface. Winds will 
gradually decrease after 04Z but will remain at 15 to 20 kts with 
gusts to 30 kts through 12Z. Perry


PDT  54  36  35  15 /  90  20  60  60 
ALW  53  36  36  17 /  90  20  70  60 
PSC  56  37  37  19 /  80  10  60  30 
YKM  54  31  36  17 /  50  10  60  30 
HRI  58  37  38  18 /  80  10  60  40 
ELN  47  28  31  14 /  70  20  60  30 
RDM  52  28  35  12 /  20  10  50  60 
LGD  43  32  34  12 / 100  80  60  60 
GCD  47  31  33  11 /  40  40  60  50 
DLS  55  38  40  20 /  40  20  60  60 


OR...High Wind Warning until 10 PM PST this evening for ORZ041-044-

     Winter Storm Warning until 6 PM PST Sunday for ORZ509.

     Winter Storm Warning until 10 PM PST Sunday for ORZ502.

     Wind Advisory until 10 PM PST this evening for ORZ511.

WA...High Wind Warning until 10 PM PST this evening for WAZ024-

     Winter Storm Warning until 6 PM PST Sunday for WAZ520.

     Winter Storm Warning until 10 PM PST Sunday for WAZ030.

     Wind Advisory until 10 PM PST this evening for WAZ026-027.




[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

Northeastern Washington and Northern Idaho

FXUS66 KOTX 171817

Area Forecast Discussion
National Weather Service Spokane WA
1017 AM PST Sat Feb 17 2018

A potent system brings snow this morning and persist into Sunday.
This will carry the potential of heavy mountain snow and windy 
conditions. An Arctic front arrives by Sunday for more snow 
showers and breezy conditions. Monday looks drier, with very cold 
and dry conditions persisting into the middle of next week.
Another round of wintery precip is expected by late next week.


Morning update: Main changes to the forecast were to increase
snowfall totals today for the Plain and Leavenworth areas where an
impressive 11 inches had already fallen between 4 am and 930 am in
Plain. Other change was to lower snow totals for Pullman/Moscow 
area where temperatures in the lower to mid 30s should limit snow 
accumulations to 1 to 2 inches. Otherwise forecast is on track 
with 9 am surface plots showing the sharpest pressure falls around
Omak indicating the 998mb surface low over Vancouver Island 
should take a track into the northern valleys. This will put the 
Upper Basin, Wenatchee area, Spokane/Coeur d'Alene area southern 
portions of Stevens and Pend Oreille counties and all areas of
south of I-90 in the warm sector with a change from snow to rain 
from south to north this afternoon. This low and an associated
850mb wind jet of 50-65 kts will also promote strong wind gusts 
on the south side of the low track where numerous wind advisories 
and high wind warnings are in place. Model soundings indicate
marginal mixing potential but at least isolated damaging wind
gusts are expected as cold air advection from the west late this
afternoon into the early evening will favor some mixing down of
the winds aloft. JW


18Z TAFS: A moisture laden storm system is moving through the 
region this morning. This is resulting in a mix of rain and snow 
for most TAF sites. Precipitation will slowly turn over to mainly 
rain after 20z-21z. Conditions will fluctuate as stronger bands of
moisture move through the region, but expect widespread IFR/LIFR 
for KCOE/KSFF/KGEG/KPUW/KEAT through about 00z then improving. 
Some moderate snow amounts are possible for KCOE/KSFF/KCOE.  
KLWS/KMWH will be VFR/MVFR. Winds out of the southwest will 
increase after 20z as a cold front moves through the region. We 
are expecting sustained winds SW 20-25kts with gusts SW 30-40kts 
through 12-14z Sunday. A second shot of moisture will be possible 
near 18z Sunday as another wave moves through the region keeping
the weather unsettled through Sunday afternoon. Tobin


Spokane        40  21  24   7  22   3 / 100  80  80  20  10   0 
Coeur d'Alene  38  20  22   5  20   1 / 100  90  90  20  10   0 
Pullman        44  30  31  13  20   4 / 100  90  60  50  30  10 
Lewiston       50  35  38  19  26  11 /  90  60  30  40  40  10 
Colville       34  23  24   5  25   2 / 100  60  70  20  10   0 
Sandpoint      33  20  20   4  21   2 / 100 100  80  10  10   0 
Kellogg        35  21  21   2  17   0 / 100 100 100  50  20  10 
Moses Lake     49  29  32  15  30  11 /  30  10  20  10  10   0 
Wenatchee      45  28  30  15  29  13 /  60  10  20  10  10   0 
Omak           37  25  27   7  25   5 /  90  40  50  10   0   0 


ID...Wind Advisory until 10 PM PST this evening for Idaho Palouse-
     Lewis and Southern Nez Perce Counties-Lewiston Area. 

     Winter Storm Warning until 10 PM PST Sunday for Central 
     Panhandle Mountains. 

     Winter Storm Warning until 4 PM PST this afternoon for Coeur 
     d'Alene Area-Idaho Palouse. 

     Winter Storm Warning until 6 PM PST Sunday for Northern 

WA...Winter Storm Warning until 6 PM PST Sunday for Northeast 
     Mountains-Okanogan Highlands. 

     Winter Storm Warning until 10 PM PST Sunday for Northeast Blue 

     High Wind Warning until 10 PM PST this evening for Lower 
     Garfield and Asotin Counties-Upper Columbia Basin-
     Washington Palouse. 

     Winter Weather Advisory until 1 PM PST this afternoon for 
     Spokane Area-Upper Columbia Basin. 

     High Wind Warning from 1 PM this afternoon to 10 PM PST this 
     evening for Moses Lake Area-Waterville Plateau-Wenatchee 

     Wind Advisory until 10 PM PST this evening for Spokane Area. 

     Winter Storm Warning until 6 PM PST Sunday for East Slopes 
     Northern Cascades. 

     Winter Weather Advisory until 4 PM PST this afternoon for 
     Okanogan Valley. 



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