334  
FXUS01 KWBC 210741  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
240 AM EST FRI DEC 21 2018  
 
VALID 12Z FRI DEC 21 2018 - 12Z SUN DEC 23 2018  
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE NORTHEAST
 
 
...SNOW FOR THE CASCADES AND FROM THE LOWER GREAT LAKES INTO THE  
SOUTHERN APPALACHIANS...  
 
...TEMPERATURES WILL BE 10 TO 25 DEGREES ABOVE AVERAGE FOR THE  
NORTHEAST...  
 
A DEEP ELONGATED STORM OVER THE EASTERN THIRD OF THE COUNTRY WILL  
LIFT NORTHWARD INTO EASTERN CANADA BY SATURDAY EVENING. THE  
SYSTEM WILL PRODUCE RAIN FROM THE GREAT LAKES/NORTHEAST SOUTHWARD  
TO THE CENTRAL GULF COAST/SOUTHEAST THAT WILL END OVER THE  
SOUTHEAST OVERNIGHT FRIDAY. THE RAIN WILL END OVER NEW ENGLAND BY  
SATURDAY EVENING. UPPER-LEVEL RIDGING AHEAD OF A DEEP UPPER-LEVEL  
TROUGH OVER THE EASTERN PORTION OF THE U.S. WILL AID IN BRINGING  
RECORD HIGH TEMPERATURES TO PARTS OF THE NORTHEAST ON FRIDAY. ON  
THE NORTHWESTERN SIDE OF THE PRECIPITATION SHIELD, RAIN WILL  
CHANGE OVER TO SNOW OVER PARTS OF THE UPPER GREAT LAKES INTO PARTS  
OF THE WESTERN OHIO VALLEY ON FRIDAY MORNING. THE SNOW OVER THE  
UPPER GREAT LAKES WILL END BY SATURDAY AFTERNOON, WHILE RAIN  
CHANGES OVER TO SNOW OVER PARTS OF THE LOWER GREAT LAKES INTO THE  
CENTRAL/SOUTHERN APPALACHIANS BY SATURDAY MORNING. THE SNOW WILL  
END OVER THE CENTRAL/SOUTHERN APPALACHIANS BY SATURDAY AFTERNOON  
AS SNOW BEGINS OVER NORTHERN NEW ENGLAND.  
 
MEANWHILE, A FRONT OVER THE NORTHERN HIGH PLAINS INTO PARTS OF THE  
GREAT BASIN/CENTRAL CALIFORNIA WILL MOVE EASTWARD TO THE UPPER  
GREAT LAKES TO THE SOUTHERN HIGH PLAINS BY SATURDAY EVENING. THE  
STORM WILL PRODUCE RAIN AND SNOW OVER PARTS OF THE NORTHERN PLAINS  
THAT WILL CHANGE OVER TO ALL SNOW OVERNIGHT FRIDAY AS THE SNOW  
EXTENDS FROM THE NORTHERN PLAINS INTO PARTS OF THE UPPER GREAT  
LAKES BY SATURDAY EVENING. SNOW OVER THE NORTHERN INTERMOUNTAIN  
REGION AND RAIN OVER NORTHERN CALIFORNIA WILL SLOWLY WANE ON  
FRIDAY. IN ADDITION, RAIN AND SNOW WILL BE ON AND OFF OVER PARTS  
OF THE PACIFIC NORTHWEST THROUGH SATURDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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