249  
FXUS01 KWBC 252036  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
335 PM EST SAT NOV 25 2017  
 
VALID 00Z SUN NOV 26 2017 - 00Z TUE NOV 28 2017  
   
..HEAVY RAIN AND SNOW FOR THE SIERRAS
 
 
   
..HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST
 
 
...SNOW POSSIBLE OVER THE CASCADES INTO PARTS OF THE NORTHERN  
ROCKIES...  
 
A FRONT WILL MOVE OFF THE EASTERN SEABOARD BY SUNDAY AFTERNOON.  
ASSOCIATED UPPER-LEVEL ENERGY OVER THE LOWER GREAT LAKES/CENTRAL  
APPALACHIANS WILL MOVE EASTWARD OFF THE NORTHEAST COAST BY SUNDAY  
EVENING. THE ENERGY WILL AID IN PRODUCING RAIN AND SNOW OVER  
PARTS OF THE LOWER GREAT LAKES INTO PARTS OF THE CENTRAL  
APPALACHIANS/NORTHEAST ON SATURDAY EVENING THAT WILL CHANGE OVER  
TO ALL LIGHT SNOW OVERNIGHT SATURDAY THAT WILL END WEST TO EAST ON  
SUNDAY INTO SUNDAY EVENING.  
 
ADDITIONALLY, A CLIPPER SYSTEM OVER SOUTH-CENTRAL CANADA WILL MOVE  
QUICKLY TO NORTHERN MAINE BY MONDAY. OVERNIGHT SUNDAY, LIGHT SNOW  
WILL DEVELOP OVER PARTS OF THE LOWER GREAT LAKES INTO THE NORTHERN  
APPALACHIANS THAT WILL MOVE INTO NORTHERN NEW ENGLAND BY MONDAY  
WHILE ENDING OVER THE LOWER GREAT LAKES.  
 
MEANWHILE, A FRONT OFF THE WEST COAST WILL MOVE INLAND BY SUNDAY  
AFTERNOON ADVANCING TO THE NORTHERN HIGH PLAINS/NORTHERN ROCKIES  
INTO THE GREAT BASIN/SOUTHERN CALIFORNIA BY MONDAY. AHEAD OF THE  
BOUNDARY, LIGHT RAIN WILL DEVELOP OVER PARTS OF THE PACIFIC  
NORTHWEST AND SNOW WILL DEVELOP OVER THE HIGHEST ELEVATIONS OF THE  
CASCADES ON SATURDAY EVENING THAT WILL EXPAND INTO THE NORTHERN  
ROCKIES BY SUNDAY MORNING. AS THE FRONT BEGINS TO MOVE ONSHORE ON  
SUNDAY, RAIN WILL DEVELOP OVER PARTS OF NORTHERN/CENTRAL  
CALIFORNIA THAT WILL EXPAND INLAND TO THE GREAT BASIN OVERNIGHT  
SUNDAY INTO MONDAY. WITH THE PASSAGE OF THE FRONT, SNOW LEVELS  
WILL LOWER OVER THE CASCADES, SIERRAS, AND THE NORTHERN ROCKIES  
OVERNIGHT SUNDAY INTO MONDAY. ON SUNDAY, SNOW WILL DEVELOP OVER  
THE HIGHER ELEVATIONS OF THE SIERRAS AND PARTS OF THE GREAT BASIN  
THAT WILL LOWER ON SUNDAY NIGHT INTO MONDAY. LIKEWISE, THE SNOW  
LEVELS OVER THE CASCADES INTO THE NORTHERN ROCKIES WILL LOWER,  
TOO.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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