980  
FXUS01 KWBC 112021  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
320 PM EST SAT NOV 11 2017  
 
VALID 00Z SUN NOV 12 2017 - 00Z TUE NOV 14 2017  
   
..HEAVY RAIN POSSIBLE FOR PARTS OF THE PACIFIC NORTHWEST
 
 
WEST TO EAST UPPER-LEVEL FLOW WITH LOW AMPLITUDE TO UPPER-LEVEL  
IMPULSES IS CONTRIBUTING TO DIFFICULTY IN MAINTAINING COHERENT  
SURFACE FEATURES. ONE UPPER-LEVEL FEATURE OVER THE NORTHERN  
PLAINS WILL MOVE EASTWARD TO THE MID-ATLANTIC/CENTRAL APPALACHIANS  
BY MONDAY. THE SYSTEM PRODUCES RAIN OVER PARTS OF THE CENTRAL  
PLAINS/MIDDLE MISSISSIPPI VALLEY THAT WILL MOVE EASTWARD TO THE  
MID-ATLANTIC/LOWER GREAT LAKES/CENTRAL APPALACHIANS BY MONDAY,  
TOO. A SECOND FEATURE OVER THE UPPER GREAT LAKES WILL MOVE  
EASTWARD TO NORTHERN MAINE BY SUNDAY EVENING. THE ENERGY WILL  
PRODUCE LIGHT SNOW OVER PARTS OF THE UPPER GREAT LAKES THROUGH TO  
SUNDAY AFTERNOON.  
 
MEANWHILE, MOISTURE FROM THE GULF OF MEXICO WILL FLOW NORTHWARD  
OVER THE SOUTHERN PLAINS THAT WILL AID IN PRODUCING RAIN OVER  
PARTS OF THE WESTERN GULF COAST THAT WILL EXPAND NORTHWARD INTO  
THE SOUTHERN PLAINS BY SUNDAY CONTINUING INTO MONDAY. IN  
ADDITION, ONSHORE FLOW OFF THE ATLANTIC WILL AID IN PRODUCING  
SHOWERS AND THUNDERSTORMS OVER PARTS OF THE FLORIDA PENINSULA  
THROUGH MONDAY AS WELL.  
 
AN UPPER-LEVEL LOW OFF THE NORTHWEST COAST WILL TRY TO MOVE INLAND  
THROUGH MONDAY. UPPER-LEVEL DYNAMICS WILL AID IN PRODUCING RAIN  
AND HIGHEST ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST  
THROUGH MONDAY. OVERNIGHT SUNDAY RAIN WILL MOVE INTO NORTHERN  
CALIFORNIA CONTINUING INTO MONDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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