The mountains could see 6 to 14 inches of snow above 4000 feet by Tuesday morning. Seas of 22 feet will create dangerous surf conditions on the Coast. – NOAA Seattle, WA today

NOAA has issued a Winter Weather Advisory for Washington’s Cascade mountains that is in effect Monday and Tuesday this week.  

6-14″ of snow are forecast above 4,000′.

Snow expected. Plan on difficult travel conditions. Total snow accumulations of 
6 to 14 inches with locally higher amounts. Highest snow totals will occur 
along south facing slopes including locations such as Mount Baker, and 
Paradise. - NOAA Seattle, WA today

In the next 3-days NOAA is currently forecasting:

• 30-51″ of snow for Crystal Mountain ski resort
• 30-50″ of snow for Mt. Baker Ski Resort

Snow levels will be around 4,000′ with this storm.

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM MONDAY TO 4 AM PST TUESDAY ABOVE 
4000 FEET... - NOAA Seattle, WA today

No ski resorts are yet open in Washington this season, but this storm will definitely help.

NOAA is also forecasting 22-foot waves and up to 60mph winds on the coast for WA with this storm.

Winter Weather Advisory for Washington:

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
149 PM PST Sun Nov 12 2017

Olympics-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and King Counties-
Cascades of Pierce and Lewis Counties-
149 PM PST Sun Nov 12 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM MONDAY TO 4 AM PST
TUESDAY ABOVE 4000 FEET...

* WHAT...Snow expected. Plan on difficult travel conditions. Total
  snow accumulations of 6 to 14 inches with locally higher
  amounts. Highest snow totals will occur along south facing
  slopes including locations such as Mount Baker, and Paradise.

* WHERE...Olympics, Cascades of Whatcom and Skagit Counties,
  Cascades of Snohomish and King Counties and Cascades of Pierce
  and Lewis Counties.

* WHEN...4 AM Monday to 4 AM Tuesday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times. Snow may affect travel through higher passes such as
  Stevens and White Pass.