657  
FXUS01 KWBC 240720  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
220 AM EST MON DEC 24 2018  
 
VALID 12Z MON DEC 24 2018 - 12Z WED DEC 26 2018  
 
...HEAVY SNOW POSSIBLE FOR THE SIERRAS AND PARTS OF THE GREAT  
BASIN...  
   
..HEAVY RAIN POSSIBLE FOR PARTS OF NORTHERN CALIFORNIA COAST
 
 
...DEVELOPING STORM TO BRING POTENTIAL TRAVEL TROUBLE OVER THE  
CENTRAL U.S. BEGINNING WEDNESDAY...  
 
UPPER-LEVEL ENERGY OVER THE GREAT LAKES WILL MOVE OFF THE EAST  
COAST BY CHRISTMAS MORNING. THE ENERGY WILL AID IN PRODUCING SNOW  
OVER PARTS OF THE GREAT LAKES INTO THE CENTRAL APPALACHIANS AND  
PARTS OF THE NORTHEAST THAT WILL QUICKLY END OVER THE APPALACHIANS  
BY MONDAY AFTERNOON. THE SNOW WILL START TO WANE OVER THE UPPER  
GREAT LAKES BY MONDAY EVENING AND OVERNIGHT CHRISTMAS EVE FOR THE  
LOWER GREAT LAKES INTO THE NORTHEAST. RAIN WILL DEVELOP OVER THE  
NORTHERN MID-ATLANTIC COAST, ENDING BY MONDAY AFTERNOON. IN  
ADDITION, ANOTHER AREA OF UPPER-LEVEL ENERGY OVER THE NORTHERN  
INTERMOUNTAIN REGION/GREAT BASIN WILL MOVE EASTWARD TO THE MIDDLE  
MISSISSIPPI VALLEY BY CHRISTMAS MORNING. THE ENERGY WILL AID IN  
DEVELOPING SNOW OVER PARTS OF THE NORTHERN INTERMOUNTAIN  
REGION/GREAT BASIN THAT WILL SLOWLY DISSIPATE BY MONDAY EVENING.  
 
MEANWHILE, ENERGY OVER THE EASTERN PACIFIC WILL MOVE ONSHORE OVER  
CALIFORNIA ON MONDAY EVENING FORMING AN UPPER-LEVEL LOW OVER  
SOUTHERN CALIFORNIA/SOUTHWEST BY AFTERNOON ON CHRISTMAS MOVING  
INTO THE SOUTHWEST OVERNIGHT CHRISTMAS. THE DEVELOPING STRONG  
STORM WILL PRODUCE RAIN OVER PARTS OF NORTHERN CALIFORNIA/PACIFIC  
NORTHWEST COAST ON MONDAY MORNING. AS THE STORM STARTS TO MOVE  
ONSHORE ON CHRISTMAS EVE, RAIN WILL EXPAND INTO CENTRAL CALIFORNIA  
WITH SNOW DEVELOPING OVER PARTS OF THE GREAT BASIN AND OREGON.  
OVERNIGHT CHRISTMAS EVE, SNOW WILL DEVELOP OVER THE SIERRAS AND  
FARTHER EAST INTO THE GREAT BASIN. ON CHRISTMAS MORNING, RAIN  
WILL END OVER PARTS OF NORTHERN/CENTRAL CALIFORNIA AS RAIN MOVES  
INTO SOUTHERN CALIFORNIA. BY EVENING ON CHRISTMAS, SNOW AND LOWER  
ELEVATION RAIN WILL DEVELOP OVER PARTS OF THE SOUTHWEST. AS THE  
STORM MOVES INTO THE GREAT BASIN, MOISTURE FROM THE WESTERN GULF  
OF MEXICO WILL FLOW NORTHWARD OVER THE SOUTHERN PLAINS AND THE  
LOWER MISSISSIPPI VALLEY. ON CHRISTMAS MORNING, RAIN WILL DEVELOP  
OVER PARTS OF THE MIDDLE/LOWER MISSISSIPPI VALLEY. SHOWERS AND  
THUNDERSTORMS WILL DEVELOP OVER PARTS OF THE SOUTHERN PLAINS BY  
EVENING ON CHRISTMAS WHILE RAIN CONTINUES OVER THE LOWER  
MISSISSIPPI VALLEY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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