493  
WWUS46 KSEW 171231  
WSWSEW  
 
URGENT - WINTER WEATHER MESSAGE  
NATIONAL WEATHER SERVICE SEATTLE WA  
431 AM PST SUN DEC 17 2017  
 
WAZ567-568-180030-  
/O.EXT.KSEW.WW.Y.0045.171217T1400Z-171218T1800Z/  
CASCADES OF WHATCOM AND SKAGIT COUNTIES-  
CASCADES OF SNOHOMISH AND KING COUNTIES-  
INCLUDING MOUNT BAKER SKI AREA AND STEVENS PASS  
431 AM PST SUN DEC 17 2017  
 
...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 10 AM PST MONDAY  
ABOVE 3500 FEET...  
 
* WHAT...SNOW EXPECTED. PLAN ON SLIPPERY ROAD CONDITIONS. TOTAL  
SNOW ACCUMULATIONS OF 6 TO 11 INCHES TODAY, WITH LOCAL AMOUNTS  
UP TO 15 INCHES, ARE EXPECTED. HEAVIER AMOUNTS ARE POSSIBLE  
TONIGHT.  
 
* WHERE...CASCADE MOUNTAINS FROM KING COUNTY NORTHWARD TO THE  
CANADIAN BORDER ABOVE 3500 FEET. THIS INCLUDES THE MOUNT BAKER  
SKIE AREA AND STEVENS PASS.  
 
* WHEN...UNTIL 10 AM PST MONDAY.  
 
* ADDITIONAL DETAILS...BE PREPARED FOR REDUCED VISIBILITIES AT  
TIMES.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A WINTER WEATHER ADVISORY FOR SNOW MEANS PERIODS OF SNOW WILL  
CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED  
ROADS AND LIMITED VISIBILITIES, AND USE CAUTION WHILE DRIVING.  
THE LATEST ROAD CONDITIONS FOR THE STATE YOU ARE CALLING FROM CAN  
BE OBTAINED BY CALLING 5 1 1.  
 

 
 
WWW.WEATHER.GOV/SEATTLE  
 
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