377  
FXUS01 KWBC 230804  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
303 AM EST SUN DEC 23 2018  
 
VALID 12Z SUN DEC 23 2018 - 12Z TUE DEC 25 2018  
 
...HEAVY SNOW POSSIBLE FOR THE CASCADES, SIERRAS, AND PARTS OF THE  
NORTHERN ROCKIES...  
   
..HEAVY RAIN POSSIBLE FOR NORTHERN CALIFORNIA COAST
 
 
...THE DAY AFTER CHRISTMAS, WINTER WEATHER MAY PRODUCE TRAVEL  
PROBLEMS FOR THE CENTRAL/SOUTHERN HIGH PLAINS...  
 
A FRONT EXTENDING FROM THE UPPER GREAT LAKES TO THE TENNESSEE  
VALLEY THEN SOUTHWESTWARD TO THE WESTERN GULF COAST WILL MOVE  
EASTWARD OFF MOST OF THE EASTERN SEABOARD BY MONDAY MORNING,  
CHRISTMAS EVE. THE SYSTEM WILL PRODUCE SNOW OVER THE UPPER GREAT  
LAKES/UPPER MISSISSIPPI VALLEY THAT WILL MOVE EASTWARD TO THE  
LOWER GREAT LAKES/CENTRAL APPALACHIANS OVERNIGHT SUNDAY AND INTO  
PARTS OF THE NORTHEAST ON MONDAY, ENDING BY CHRISTMAS MORNING.  
RAIN WILL DEVELOP ALONG THE FRONT OVER PARTS OF THE TENNESSEE  
VALLEY INTO THE LOWER MISSISSIPPI VALLEY ON SUNDAY MORNING THAT  
WILL MOVE EASTWARD AND EXPAND ALONG THE FRONT FROM PARTS OF THE  
CENTRAL APPALACHIANS TO PARTS OF THE TENNESSEE VALLEY/CENTRAL GULF  
COAST BY SUNDAY EVENING. THE RAIN WILL MOVE INTO PARTS OF THE  
MID-ATLANTIC OVERNIGHT SUNDAY AND OFF MOST OF THE  
MID-ATLANTIC/SOUTHEAST COAST BY MONDAY AFTERNOON.  
 
MEANWHILE, A FRONT MOVING ONSHORE OVER THE PACIFIC NORTHWEST WILL  
MOVE INLAND AND DISSIPATE BY SUNDAY EVENING. ONSHORE FLOW OFF THE  
PACIFIC WILL DEVELOP OVER THE PACIFIC NORTHWEST THROUGH MONDAY  
AFTERNOON. RAIN AND HIGHER ELEVATION SNOW WILL DEVELOP OVER THE  
PACIFIC NORTHWEST/NORTHERN CALIFORNIA WITH SNOW EXTENDING EASTWARD  
INTO PARTS OF THE NORTHERN INTERMOUNTAIN REGION/NORTHERN ROCKIES  
ON SUNDAY MORNING. OVERNIGHT SUNDAY, THE SNOW WILL EXPAND INTO  
PARTS OF THE GREAT BASIN. WINTER STORM WARNINGS A POSTED FOR THE  
CASCADES AND THE OLYMPIC PENINSULA THROUGH EARLY MONDAY MORNING.  
THE RAIN AND SNOW WILL START TO WANE OVER THE PARTS OF THE PACIFIC  
NORTHWEST ON MONDAY EVENING, CHRISTMAS EVE, AND ENDING OVER PARTS  
OF THE REGION BY CHRISTMAS MORNING.  
 
ON MONDAY, CHRISTMAS EVE, ANOTHER FRONT WILL MOVE ONSHORE OVER  
NORTHERN CALIFORNIA MOVING INLAND TO PARTS OF THE  
SOUTHWEST/SOUTHERN CALIFORNIA BY CHRISTMAS MORNING. THE STORM  
WILL BRING RAIN TO CENTRAL CALIFORNIA BY MONDAY AFTERNOON AND SNOW  
OVER THE SIERRAS OVERNIGHT CHRISTMAS EVE. LATER WITH THE STORM,  
RAIN AND SNOW WILL MOVE INTO PARTS OF THE SOUTHWEST/SOUTHERN  
ROCKIES CHRISTMAS NIGHT.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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