564  
FXUS01 KWBC 250750  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
250 AM EST TUE DEC 25 2018  
 
VALID 12Z TUE DEC 25 2018 - 12Z THU DEC 27 2018  
 
...HEAVY SNOW POSSIBLE FOR PARTS OF THE CENTRAL ROCKIES AND  
NORTHERN/CENTRAL PLAINS...  
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE SOUTHERN/CENTRAL PLAINS
 
 
...POST-CHRISTMAS WINTER STORM TO BRING HEAVY SNOW FROM THE  
CENTRAL PLAINS THROUGH THE GREAT LAKES...  
 
UPPER-LEVEL ENERGY OVER THE MIDDLE MISSISSIPPI VALLEY/WESTERN OHIO  
VALLEY WILL AID IN PRODUCING RAIN OVER PARTS OF THE AREA THAT WILL  
END BY AFTERNOON ON CHRISTMAS. ANOTHER AREA OF UPPER-LEVEL ENERGY  
OVER THE UPPER GREAT LAKES WILL PRODUCE LIGHT SNOW OVER PARTS OF  
THE UPPER GREAT LAKES THROUGH WEDNESDAY MORNING.  
 
MEANWHILE, A DEVELOPING UPPER-LEVEL LOW OVER CALIFORNIA WILL MOVE  
EASTWARD TO THE SOUTHERN ROCKIES/SOUTHERN HIGH PLAINS BY WEDNESDAY  
EVENING. THE STORM WILL PRODUCE RAIN AND HIGHER ELEVATION SNOW  
OVER NORTHERN/CENTRAL CALIFORNIA AND SNOW OVER PARTS OF THE GREAT  
BASIN/NORTHERN INTERMOUNTAIN REGION. THE RAIN ENDS OVER  
NORTHERN/CENTRAL CALIFORNIA BY AFTERNOON ON CHRISTMAS. RAIN WILL  
ALSO MOVE INTO SOUTHERN CALIFORNIA BY CHRISTMAS AFTERNOON, TOO.  
OVERNIGHT CHRISTMAS, SNOW WILL EXPAND INTO PARTS OF THE  
NORTHERN/CENTRAL ROCKIES, WHILE RAIN AND HIGHER ELEVATION SNOW  
DEVELOPS OVER PARTS OF THE SOUTHWEST.  
 
AS THE STORM MOVES EASTWARD, MOISTURE FROM THE WESTERN GULF OF  
MEXICO WILL FLOW NORTHWARD OVER THE SOUTHERN PLAINS INTO THE  
CENTRAL PLAINS AND THE MIDDLE/LOWER MISSISSIPPI VALLEY. THE  
MOISTURE WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER  
PARTS OF THE SOUTHERN PLAINS BY EVENING ON CHRISTMAS, EXPANDING  
INTO PARTS OF THE CENTRAL PLAINS BY WEDNESDAY MORNING. THE  
SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER PARTS OF THE  
CENTRAL/SOUTHERN PLAINS INTO WEDNESDAY EVENING. BY WEDNESDAY  
MORNING, SNOW WILL DEVELOP OVER PARTS OF THE NORTHERN/CENTRAL  
ROCKIES EXPANDING INTO PARTS OF THE UPPER MISSISSIPPI VALLEY BY  
WEDNESDAY EVENING. ALSO ON WEDNESDAY, RAIN WILL DEVELOP OVER  
PARTS OF THE CENTRAL PLAINS AND THE LOWER/MIDDLE MISSISSIPPI  
VALLEY EXPANDING INTO PARTS OF THE WESTERN OHIO VALLEY BY  
WEDNESDAY EVENING.  
 
FURTHERMORE, A FRONT WILL MOVE ONSHORE OVER THE PACIFIC NORTHWEST  
ON WEDNESDAY MOVING INLAND BY WEDNESDAY EVENING. THE SYSTEM WILL  
PRODUCE RAIN AND HIGHER ELEVATION SNOW OVER PARTS OF THE PACIFIC  
NORTHWEST BY WEDNESDAY AFTERNOON THAT WILL EXPAND INTO PARTS OF  
THE NORTHERN INTERMOUNTAIN REGION BY WEDNESDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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