287  
FXUS01 KWBC 232054  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
353 PM EST SAT DEC 23 2017  
 
VALID 00Z SUN DEC 24 2017 - 00Z TUE DEC 26 2017  
 
...HEAVY SNOW POSSIBLE OVER PARTS OF THE NORTHEAST AND THE UPPER  
GREAT LAKES...  
 
...SNOW POSSIBLE FOR PART OF THE CASCADES AND THE NORTHERN/CENTRAL  
ROCKIES...  
 
...SNOW, RAIN, AND FREEZING RAIN MIXED OVER PARTS OF THE  
NORTHEAST...  
 
LOW PRESSURE OVER NORTHERN NEW ENGLAND WILL MOVE NORTHEASTWARD  
INTO THE CANADIAN MARITIMES BY SUNDAY MORNING, CHRISTMAS EVE,  
WHILE DEVELOPING AREA OF LOW DEVELOPS OVER THE SOUTHEAST. SNOW,  
RAIN, AND FREEZING RAIN, MIXED WILL DEVELOP OVER PARTS OF NORTHERN  
NEW ENGLAND ON SATURDAY EVENING THAT WILL CHANGE OVER TO AREAS OF  
RAIN AND SNOW OVERNIGHT SATURDAY OVER NORTHERN NEW ENGLAND. THESE  
AREAS OF RAIN/SNOW WILL COME TO AN END OVER THE NORTHEAST BY  
SUNDAY MORNING. SNOW WILL ALSO DEVELOP OVER PARTS OF THE LOWER  
GREAT LAKES/EASTERN OHIO VALLEY THAT WILL WANE BY LATE SATURDAY  
NIGHT. IN ADDITION, RAIN WILL DEVELOP OVER SOUTHERN NEW ENGLAND  
INTO THE NORTHERN MID-ATLANTIC THAT WILL, LIKEWISE, END BY SUNDAY  
MORNING. RAIN AND A FEW EMBEDDED THUNDERSTORMS WILL DEVELOP ALONG  
THE ASSOCIATED FRONT OVER PARTS OF THE SOUTHERN  
MID-ATLANTIC/SOUTHEAST THAT WILL MOVE OFF THE COAST SUNDAY  
AFTERNOON INTO SUNDAY EVENING ON CHRISTMAS EVE.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER THE NORTHERN ROCKIES WILL MOVE  
SOUTHEASTWARD TO THE SOUTHERN OHIO VALLEY BY SUNDAY EVENING THAT  
WILL BEGIN TO MOVE OFF THE NORTHEAST COAST BY CHRISTMAS MORNING,  
MONDAY MORNING. THE ENERGY WILL AID IN DEVELOPING LOW PRESSURE  
OVER THE OHIO VALLEY BY SUNDAY AFTERNOON INTO EVENING THAT WILL  
MERGE WITH A WAVE OF LOW PRESSURE OVER THE SOUTHEAST FORMING A  
DEEP LOW OVER THE GULF OF MAINE ON CHRISTMAS MORNING, MONDAY  
MORNING. THE ENERGY WILL AID IN PRODUCING SNOW OVER PARTS OF THE  
CENTRAL ROCKIES/CENTRAL PLAINS THAT WILL MOVE INTO THE CENTRAL  
PLAINS/MIDDLE MISSISSIPPI VALLEY BY SUNDAY MORNING THAT WILL  
EXPAND INTO THE GREAT LAKES AND OHIO/TENNESSEE VALLEYS BY SUNDAY  
EVENING. THE SNOW WILL MOVE INTO THE NORTHEAST BY CHRISTMAS  
MORNING, MONDAY, WITH THE SNOW HEAVY AT TIMES. ADDITIONALLY, RAIN  
WILL BEGIN TO DEVELOP OVER PARTS OF THE TENNESSEE VALLEY SUNDAY  
AFTERNOON THAT WILL EXPAND INTO THE CENTRAL APPALACHIANS BY SUNDAY  
EVENING. THE RAIN WILL CHANGE OVER TO SNOW OVER THE CENTRAL  
APPALACHIANS OVERNIGHT SUNDAY. ALSO OVERNIGHT SUNDAY, RAIN WILL  
DEVELOP OVER NORTHERN MID-ATLANTIC COAST MOVING INTO PARTS OF  
SOUTHERN NEW ENGLAND BY MONDAY MORNING, CHRISTMAS.  
 
MORE TO FOLLOW  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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