295  
FXUS01 KWBC 182000  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 PM EST MON DEC 18 2017  
 
VALID 00Z TUE DEC 19 2017 - 00Z THU DEC 21 2017  
   
..HEAVY SNOW POSSIBLE OVER THE CASCADES AND NORTHERN ROCKIES
 
 
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST COAST
 
 
...HEAVY RAIN POSSIBLE OVER PORTIONS OF THE SOUTHERN PLAINS INTO  
THE SOUTHERN APPALACHIANS...  
 
ONSHORE FLOW AHEAD OF THE NEXT SYSTEM WILL AID IN PRODUCING RAIN  
AND HIGHEST ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST AND  
SNOW AND LOWER ELEVATIONS RAIN OVER PARTS OF THE NORTHERN  
INTERMOUNTAIN REGION/NORTHERN ROCKIES THROUGH TUESDAY MORNING. ON  
TUESDAY THE NEXT SYSTEM WILL BEGIN TO MOVE ONSHORE OVER THE  
PACIFIC NORTHWEST MOVING INLAND TO THE NORTHERN ROCKIES/GREAT  
BASIN AND PARTS OF CENTRAL CALIFORNIA BY WEDNESDAY. THE SNOW  
LEVELS WILL DECREASE OVER THE NORTHWEST AS THE ASSOCIATED FRONT  
MOVES INLAND. RAIN AND HIGHER ELEVATIONS SNOW WILL DEVELOP OVER  
THE NORTHWEST AND SNOW OVER THE NORTHERN INTERMOUNTAIN  
REGION/NORTHERN ROCKIES ON TUESDAY.  
 
MORE TO FOLLOW  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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