329  
FXUS01 KWBC 242030  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
329 PM EST SUN DEC 24 2017  
 
VALID 00Z MON DEC 25 2017 - 00Z WED DEC 27 2017  
 
...HEAVY SNOW POSSIBLE OVER PARTS OF THE NORTHEAST, THE GREAT  
LAKES, AND CENTRAL ROCKIES...  
   
..FREEZING RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST
 
 
...SNOW POSSIBLE FOR PART OF THE CASCADES AND THE NORTHERN  
ROCKIES...  
 
...A SLIGHT RISK OF FREEZING RAIN OVER PARTS OF SOUTHERN NEW  
ENGLAND...  
 
UPPER-LEVEL ENERGY OVER THE OHIO VALLEY WILL MOVE NORTHEASTWARD  
INTO SOUTHEASTERN CANADA OVERNIGHT CHRISTMAS, MONDAY NIGHT, THAT  
WILL COMBINE WITH LOW PRESSURE OFF THE SOUTHERN MID-ATLANTIC COAST  
THAT IS MOVING NORTHEASTWARD TO OFF OF CAPE COD BY CHRISTMAS  
MORNING, MONDAY. THE SYSTEM WILL PRODUCE SNOW OVER THE GREAT  
LAKES/OHIO VALLEY THAT WILL MOVE NORTHEASTWARD INTO THE NORTHEAST  
WHILE MERGING WITH AN AREA OF RAIN MOVING NORTHWARD ALONG THE  
MID-ATLANTIC COAST INTO SOUTHERN NEW ENGLAND BY MONDAY MORNING,  
CHRISTMAS. THE AREA WILL CHANGED OVER TO MOSTLY SNOW BY MONDAY  
AFTERNOON OVER THE NORTHEAST THAT WILL MOVE INTO SOUTHEASTERN  
CANADA BY EARLY TUESDAY MORNING. IN ADDITION, ALONG THE  
RAIN/SNOW LINE POCKETS OF RAIN/FREEZING RAIN WILL DEVELOP OVER  
PARTS OF SOUTHERN NEW ENGLAND OVERNIGHT CHRISTMAS EVE, SUNDAY  
EVENING ENDING BY MONDAY MORNING. IN THE WAKE OF THE SYSTEM,  
UPPER-LEVEL ENERGY WILL MOVE OVER THE GREAT LAKES INTO THE  
NORTHEAST THROUGH TUESDAY. THE ENERGY WILL AID IN PRODUCING LAKE  
EFFECT SNOW DOWNWIND FROM THE GREAT LAKES FROM CHRISTMAS, MONDAY,  
INTO TUESDAY.  
 
MEANWHILE, WEAKENING UPPER-LEVEL ENERGY WILL MOVE ONSHORE OVER THE  
PACIFIC NORTHWEST AND CONTINUE EASTWARD TO PARTS OF THE MIDDLE  
MISSISSIPPI VALLEY BY TUESDAY. AN AREA OF COLD HIGH PRESSURE OVER  
WEST-CENTRAL CANADA WILL MOVE SOUTHEASTWARD TO THE NORTHERN HIGH  
PLAINS BY TUESDAY. THE SYSTEM WILL PRODUCE COASTAL RAIN AND  
HIGHER ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST WITH  
SNOW STREAMING INTO PART OF THE NORTHERN INTERMOUNTAIN  
REGION/GREAT BASIN OVERNIGHT CHRISTMAS EVE, SUNDAY NIGHT,  
CONTINUING OVER THE NORTHWEST THROUGH LATE CHRISTMAS EVENING,  
MONDAY EVENING. ADDITIONALLY, POCKETS OF RAIN/FREEZING RAIN WILL  
DEVELOP OVER PARTS OF THE PACIFIC NORTHWEST ENDING OVERNIGHT  
MONDAY. THE SNOW WILL EXPAND INTO PARTS OF THE NORTHERN/CENTRAL  
ROCKIES BY CHRISTMAS MORNING, MONDAY, THAT WILL CONTINUE TO EXPAND  
EASTWARD INTO THE CENTRAL/NORTHERN HIGH PLAINS MONDAY EVENING INTO  
TUESDAY.  
 
MORE TO FOLLOW  
 
 
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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