821  
FXUS01 KWBC 020759  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
258 AM EST SAT DEC 02 2017  
 
VALID 12Z SAT DEC 02 2017 - 12Z MON DEC 04 2017  
   
..HEAVY SNOW POSSIBLE OVER PARTS OF THE NORTHERN ROCKIES
 
 
A DEVELOPING UPPER-LEVEL LOW JUST OFF THE NORTHWEST COAST WILL  
MOVE EASTWARD TO THE NORTHERN INTERMOUNTAIN REGION/NORTHERN  
ROCKIES BY SUNDAY EVENING. THE SYSTEM WILL PRODUCE RAIN AND  
HIGHER ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST AND SNOW  
OVER PARTS OF THE NORTHERN INTERMOUNTAIN REGION THAT WILL MOVE  
INLAND ON SATURDAY TO PARTS OF NORTHERN CALIFORNIA BY SATURDAY  
EVENING. SNOW WILL CONTINUE TO MOVE INLAND TO THE NORTHERN  
ROCKIES/GREAT BASIN ON SUNDAY INTO SUNDAY EVENING. THE RAIN AND  
HIGHER ELEVATION SNOW WILL BEGIN TO WIND DOWN ALSO ON SUNDAY INTO  
SUNDAY EVENING OVER THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER THE UPPER GREAT LAKES WILL AID  
IN PRODUCING LIGHT RAIN OVER THE REGION ON SATURDAY MORNING INTO  
EVENING. IN ADDITION, UPPER-LEVEL ENERGY MOVING OFF THE SOUTHEAST  
COAST WILL AID IN PRODUCING LIGHT RAIN OVER PARTS OF THE  
SOUTHEAST/SOUTHERN MID-ATLANTIC ON SATURDAY MORNING ENDING  
OVERNIGHT SATURDAY.  
 
ELSEWHERE, UPPER-LEVEL ENERGY OVER NORTHWESTERN MEXICO WILL MOVE  
EASTWARD TO THE SOUTHERN PLAINS ON SUNDAY INTO SUNDAY EVENING.  
MOISTURE FROM THE GULF OF MEXICO WILL BEGIN TO STREAM NORTHWARD  
OVER THE SOUTHERN PLAINS ON SATURDAY THAT WILL INTENSIFY OVERNIGHT  
SATURDAY INTO SUNDAY. THE MOISTURE AND ENERGY WILL AID IN  
DEVELOPING SHOWER AND THUNDERSTORMS OVER PARTS OF THE SOUTHERN  
PLAINS/WESTERN GULF COAST SUNDAY MORNING INTO SUNDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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