400  
FXUS01 KWBC 142018  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
318 PM EST THU DEC 14 2017  
 
VALID 00Z FRI DEC 15 2017 - 00Z SUN DEC 17 2017  
 
...HEAVY LAKE EFFECT/LAKE ENHANCES SNOW POSSIBLE DOWNWIND FROM THE  
GREAT LAKES...  
 
...HEAVY SNOW POSSIBLE OVER PARTS OF THE CASCADES AND THE NORTHERN  
ROCKIES...  
   
..HEAVY RAIN POSSIBLE OVER PARTS OF SOUTHERN TEXAS
 
 
A REGION OF STRONG UPPER-LEVEL ENERGY OVER WESTERN ONTARIO/UPPER  
MISSISSIPPI VALLEY WILL MOVE ACROSS THE GREAT LAKES TO OFF THE  
NORTHEAST COAST BY SATURDAY. LAKE EFFECT/LAKE ENHANCES SNOW WILL  
DEVELOP OVER THE GREAT LAKES THROUGH SATURDAY WITH SNOW HEAVY AT  
TIMES. THE ASSOCIATED FRONT WILL ALSO AID IN PRODUCING SNOW OVER  
PARTS OF THE NORTHEAST AND UPPER MISSISSIPPI VALLEY/NORTHERN  
PLAINS ALSO THROUGH SATURDAY. IN ADDITION, UPPER-LEVEL ENERGY  
OVER THE OVER THE CENTRAL PLAINS WILL MOVE TO THE LOWER  
MISSISSIPPI AND TENNESSEE VALLEYS BY FRIDAY MORNING. THE ENERGY  
WILL TRIGGER LIGHT SNOW OVER PARTS OF THE NORTHERN/CENTRAL PLAINS  
THAT WILL END BY LATE EVENING ON THURSDAY.  
 
MEANWHILE, ONSHORE FLOW DEVELOPS OVER PARTS OF THE PACIFIC  
NORTHWEST OVERNIGHT THURSDAY INTO SATURDAY. THE FLOW WILL AID IN  
PRODUCING COASTAL RAIN AND HIGHER ELEVATION SNOW OVER THE PACIFIC  
NORTHWEST THROUGH SATURDAY. ADDITIONALLY, UPPER-LEVEL ENERGY AND  
ASSOCIATED UPPER-LEVEL TROUGH WILL MOVE ONSHORE OVER THE NORTHWEST  
ON FRIDAY EVENING THAT WILL MOVE SOUTHEASTWARD TO THE NORTHERN  
INTERMOUNTAIN REGION TO CENTRAL CALIFORNIA BY SATURDAY MORNING.  
THE ENERGY WILL AID IN PRODUCING SNOW OVER PARTS OF THE NORTHERN  
INTERMOUNTAIN REGION/NORTHERN ROCKIES INTO PARTS OF THE GREAT  
BASIN FRIDAY EVENING INTO SATURDAY. ELSEWHERE, A FRONT OVER THE  
GULF OF MEXICO WILL STALL WHILE A WAVE OF LOW PRESSURE WILL MOVE  
WESTWARD TO THE MEXICAN COAST ON FRIDAY INTO SATURDAY. RAIN WILL  
DEVELOP OVER PARTS THE SOUTHERN TIP OF TEXAS OVERNIGHT THURSDAY  
INTO SATURDAY MORNING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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