988  
FXUS01 KWBC 202000  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 PM EST MON NOV 20 2017  
 
VALID 00Z TUE NOV 21 2017 - 00Z THU NOV 23 2017  
   
..HEAVY RAIN POSSIBLE FOR THE PACIFIC NORTHWEST
 
 
   
..LIGHT LAKE EFFECT SNOW DOWNWIND OF THE GREAT LAKES
 
 
   
..LIGHT SNOW OVER PARTS OF NORTHERN NEW ENGLAND
 
 
A FRONT EXTENDING FROM THE UPPER MISSISSIPPI VALLEY/NORTHERN  
PLAINS NORTHWESTWARD INTO THE NORTHERN HIGH PLAINS WILL MOVE SOUTH  
AND EASTWARD TO OFF THE EASTERN SEABOARD AND OFF THE GULF COAST  
STATES BY WEDNESDAY. LIGHT SNOW WILL DEVELOP OVER PARTS OF THE  
UPPER GREAT LAKES OVERNIGHT MONDAY THAT WILL BECOME RAIN AND SNOW  
OVER THE LOWER GREAT LAKES/OHIO VALLEY BY TUESDAY EVENING. THE  
RAIN AND LIGHT SNOW WILL MOVE TO THE NORTHEAST OVERNIGHT TUESDAY  
INTO WEDNESDAY.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER THE PACIFIC NORTHWEST WILL MOVE  
SOUTHEASTWARD TO THE WESTERN GULF COAST WHILE WEAKENING. THE  
ENERGY WILL AID IN DEVELOPING RAIN AND HIGHER ELEVATION SNOW OVER  
PARTS OF PACIFIC NORTHWEST INTO THE NORTHERN ROCKIES THAT WILL  
MOVE SOUTHEASTWARD TO THE CENTRAL ROCKIES/CENTRAL PLAINS AND  
DISSIPATE BY TUESDAY EVENING. IN ADDITION, ANOTHER AREA OF  
UPPER-LEVEL ENERGY OVER THE WESTERN GULF COAST WILL MOVE EASTWARD  
TO THE SOUTHEAST BY TUESDAY EVENING THEN MOVE NORTHEASTWARD OUT  
OVER THE WESTERN ATLANTIC BY WEDNESDAY AIDING IN THE DEVELOPMENT  
OF AN AREA OF LOW PRESSURE OFF THE NORTH CAROLINA COAST OVERNIGHT  
TUESDAY INTO WEDNESDAY. SHOWERS AND THUNDERSTORMS WILL DEVELOP  
OVER PARTS OF THE SOUTHEAST/FLORIDA ON TUESDAY INTO TUESDAY  
AFTERNOON.  
 
MORE TO FOLLOW  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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