466  
FXUS01 KWBC 161956  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
256 PM EST SUN DEC 16 2018  
 
VALID 00Z MON DEC 17 2018 - 00Z WED DEC 19 2018  
 
...HEAVY SNOW POSSIBLE OVER THE NORTHERN CASCADES AND NORTHERN  
INTERMOUNTAIN REGION...  
   
..HEAVY SNOW AND RAIN/FREEZING RAIN OVER PARTS OF NEW ENGLAND
 
 
   
..HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST COAST
 
 
A STORM ALONG THE NORTHERN MID-ATLANTIC COAST WILL MOVE  
NORTHEASTWARD TO THE CANADIAN MARITIMES BY TUESDAY. THE SYSTEM  
WILL PRODUCE RAIN AND SNOW WITH POCKETS OF RAIN/FREEZING RAIN OVER  
PARTS OF THE NORTHEAST. RAIN WILL ALSO DEVELOP OVER PARTS OF THE  
NORTHERN MID-ATLANTIC INTO PARTS OF THE CENTRAL APPALACHIANS THAT  
WILL MOVE OFF THE COAST OVERNIGHT SUNDAY. RAIN WILL END OVER  
SOUTHERN NEW ENGLAND BY MONDAY AFTERNOON. SNOW WILL CONTINUE OVER  
NORTHERN NEW ENGLAND THROUGH MONDAY AFTERNOON, TOO. UPPER-LEVEL  
ENERGY JUST NORTH OF LAKE SUPERIOR WILL MOVE SOUTHEASTWARD OFF THE  
NORTHEAST COAST MONDAY EVENING INTO TUESDAY. THE ENERGY WILL  
TRIGGER SNOW OVER THE LOWER GREAT LAKES INTO THE NORTHEAST ON  
MONDAY AFTERNOON THAT WILL WANE OVER THE AREA ON TUESDAY.  
 
MEANWHILE, A FRONT OVER THE WEST COAST WILL MOVE INLAND TO THE  
NORTHERN PLAINS BY TUESDAY WHILE ANOTHER FRONT WILL COME ONSHORE  
ON TUESDAY MORNING. ONSHORE FLOW ASSOCIATED WITH THE SYSTEM WILL  
AID IN PRODUCING RAIN OVER THE PACIFIC NORTHWEST AND  
NORTHERN/CENTRAL CALIFORNIA WITH SNOW OVER THE CASCADES AND BLUE  
MOUNTAINS. OVERNIGHT SUNDAY, THE RAIN AND HIGHER ELEVATION SNOW  
WILL EXPAND EASTWARD INTO PARTS OF THE NORTHERN INTERMOUNTAIN  
REGION AND PARTS OF THE GREAT BASIN. BY MONDAY EVENING, SNOW AND  
LOWER ELEVATION RAIN WILL MOVE INTO THE NORTHERN INTERMOUNTAIN  
REGION/NORTHERN ROCKIES AND GREAT BASIN. ALSO BY MONDAY EVENING  
THE RAIN WILL BE LIMITED TO THE PACIFIC NORTHWEST COAST.  
OVERNIGHT MONDAY ADDITIONAL MOISTURE WILL MOVE ONSHORE OVER THE  
PACIFIC NORTHWEST AND CONTINUE INTO TUESDAY. RAIN AND HIGHER  
ELEVATION SNOW WILL EXPAND FARTHER INLAND OVER THE PACIFIC  
NORTHWEST AND INTO THE NORTHERN INTERMOUNTAIN REGION BY TUESDAY.  
IN ADDITION, THE SNOW AND LOWER ELEVATION RAIN WILL END OVER THE  
NORTHERN ROCKIES AND GREAT BASIN BY TUESDAY MORNING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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