781  
FXUS01 KWBC 220719  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
218 AM EST SAT DEC 22 2018  
 
VALID 12Z SAT DEC 22 2018 - 12Z MON DEC 24 2018  
   
..HEAVY SNOW POSSIBLE OVER THE CASCADES
 
 
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST
 
 
A STRONG STORM MOVING INTO SOUTHEASTERN CANADA WILL MOVE  
NORTHEASTWARD TO THE DAVIS STRAIT BY SUNDAY MORNING. THE STORM  
WILL BRING RAIN TO NEW ENGLAND AND SNOW FROM THE LOWER GREAT LAKES  
INTO THE CENTRAL APPALACHIANS THAT WILL START TO WANE BY SATURDAY  
EVENING. THE RAIN OVER NEW ENGLAND WILL CHANGE OVER TO SNOW BY  
SATURDAY EVENING, TOO. THE PRECIPITATION WILL END OVERNIGHT  
SATURDAY OVER THE NORTHEAST.  
 
MEANWHILE, ANOTHER STORM OVER NORTHERN PLAINS/UPPER MISSISSIPPI  
VALLEY WILL MOVE EASTWARD TO THE LOWER GREAT LAKES BY SUNDAY  
EVENING. THE SYSTEM WILL PRODUCE SNOW OVER PARTS OF THE UPPER  
MIDWEST THAT WILL MOVE INTO THE UPPER GREAT LAKES BY SUNDAY  
AFTERNOON AND INTO THE LOWER GREAT LAKES BY SUNDAY EVENING. RAIN  
WILL DEVELOP ALONG THE ASSOCIATED FRONT OVER THE TENNESSEE VALLEY  
INTO PARTS OF THE CENTRAL GULF COAST ON SUNDAY MORNING. THE RAIN  
WILL EXPAND ALONG THE BOUNDARY AND MOVE EASTWARD TO PARTS OF THE  
LOWER GREAT LAKES/OHIO VALLEY SOUTHWESTWARD INTO THE EASTERN GULF  
COAST BY SUNDAY EVENING. IN ADDITION, AN AREA OF UPPER-LEVEL  
ENERGY OVER THE NORTHERN ROCKIES WILL MOVE SOUTHEASTWARD TO THE  
SOUTHERN OHIO AND TENNESSEE VALLEYS BY SUNDAY EVENING. THE ENERGY  
WILL PRODUCE SNOW OVER PARTS OF THE CENTRAL ROCKIES ON SATURDAY  
MORNING THAT WILL MOVE TO THE CENTRAL HIGH PLAINS BEFORE  
DISSIPATING OVERNIGHT SATURDAY.  
 
FURTHERMORE, UPPER-LEVEL ENERGY OVER THE EASTERN PACIFIC WILL MOVE  
ONSHORE OVER THE PACIFIC NORTHWEST OVERNIGHT SATURDAY INTO SUNDAY.  
RAIN AND HIGHER ELEVATION SNOW WILL DEVELOP OVER PARTS OF THE  
NORTHWEST ON SATURDAY THAT WILL EXPAND INLAND OVER THE NORTHWEST  
OVERNIGHT SATURDAY. THE SNOW WILL CONTINUE TO EXPAND EASTWARD  
INTO THE NORTHERN ROCKIES BY SUNDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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