NOAA has issued Winter Storm Warnings and Advisories in many locations across Washington, Idaho, and Montana today.

Mt. Baker ski area, WA had already seen 9″ of snow at 8am this morning.

In Washington, NOAA is calling for snowfall totals up to 22″ today.

Additional snow accumulations of 4 to 7 inches with localized amounts up to 
22 inches expected. - NOAA Seattle, WA

In Idaho, NOAA is calling for snowfall totals up to 8″ today and tomorrow.

Total snow accumulations of 3 to 6 inches, with local mountain accumulations 
6 to 8 inches, are expected. - NOAA Spokane, WA tody

In Montana, NOAA is calling for snowfall totals up to 6″ today and tomorrow.

Total snow accumulations of 1 to 4 inches, with localized amounts up to 6 inches 
towards Lookout Pass, are expected. - NOAA Missoula, MT today

WASHIHNGTON:

Winter Storm Warning for Washington:

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
442 AM PST Tue Nov 28 2017

Corrected to add higher upper limit to snowfall in Cascades of
Whatcom and Skagit Counties.

Cascades of Whatcom and Skagit Counties-
Including Concrete, Lyman, and Hamilton

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING...

* WHAT...Heavy snow expected today. Plan on difficult travel
  conditions. Additional snow accumulations of 4 to 7 inches with
  localized amounts up to 22 inches expected.

* WHERE...Cascades of Whatcom and Skagit Counties.

* WHEN...Until 10 PM PST this evening.

* ADDITIONAL DETAILS...Be prepared for significant reductions in
  visibility at times.

IDAHO:

Winter Weather Advisory for Idaho:

URGENT - WINTER WEATHER MESSAGE
National Weather Service Spokane WA
1208 PM PST Tue Nov 28 2017

...WINTER TRAVEL CONDITIONS TODAY AND TONIGHT...

Central Panhandle Mountains-
Including the following locations Osburn, Wallace, Mullan,
Dobson Pass, and Lookout Pass

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO
7 AM PST WEDNESDAY ABOVE 3000 FEET...

* WHAT...Snow expected. Plan on slippery road conditions,
  including the evening commute tonight and the morning commute on
  Wednesday. Total snow accumulations of 3 to 6 inches, with
  local mountain accumulations 6 to 8 inches, are expected.

* WHERE...Osburn, Wallace, Mullan, Dobson Pass, and Lookout Pass.

* WHEN...4 PM today to 7 AM Wednesday.

* ADDITIONAL DETAILS...Snow will fall at elevations down to 2500
  ft, but accumulations are expected to be light, 1-2 inches. The
  biggest impact will be from east of Wallace along I90 up to
  Lookout Pass where 4 to 6 inches of snow is expected. Be
  prepared for reduced visibilities and impacts on area roads.

MONTANA:

Winter Weather Advisory for Montana:

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
1048 AM MST Tue Nov 28 2017

Kootenai/Cabinet Region-Lower Clark Fork Region-

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO
8 AM MST WEDNESDAY...

* WHAT...Snow expected. Plan on slippery road conditions for the
  morning commute. Total snow accumulations of 1 to 4 inches, with
  localized amounts up to 6 inches towards Lookout Pass, are
  expected.

* WHERE...Highway 2 Kalispell to Happy`s Inn, Highway 56 Bull Lake
  Road, Highway 93 Eureka to Olney, Evaro Hill, Highway 200
  Thompson Falls to Plains, and I-90 Lookout Pass to Superior.

* WHEN...From 8 PM this evening to 8 AM MST Wednesday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times.