196  
FXUS02 KWBC 040408  
PMDEPD  
 
EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
1107 PM EST SUN DEC 03 2017  
 
VALID 12Z THU DEC 07 2017 - 12Z MON DEC 11 2017  
   
..MILD AND DRY IN THE WEST BUT COLD AND WINTRY IN THE EAST
 
 
TROUGHING WILL BE STUCK IN THE EAST AS UPPER RIDGING REMAINS IN  
PLACE OVER WESTERN CANADA/CONUS AS WELL AS IN THE NW ATLANTIC.  
THIS WILL CONTINUE COOL/COLD TEMPERATURES IN THE EAST AND NEAR TO  
ABOVE AVERAGE TEMPERATURES IN THE WEST WITH A FEW EXCEPTIONS. THE  
MIDDLE STATES WILL BE THE DIVIDING LINE AND WILL SEE AN EBB AND  
FLOW ON EITHER SIDE OF AVERAGE AS THE BOUNDARY WOBBLES EAST AND  
WEST. CLIPPER SYSTEMS WILL DIVE OUT OF CANADA AND TURN THE CORNER  
THROUGH THE MIDWEST/OHIO VALLEY/GREAT LAKES BEFORE LIFTING OUT  
INTO THE ATLANTIC. OFF THE COAST, A FRONTAL SYSTEM MAY CARRY A  
WAVE OR TWO OF LOW PRESSURE TO THE NORTH/NORTHEAST AND MAY SPREAD  
SOME RAIN/SNOW TO COASTAL AREAS OR JUST INLAND. THE MODELS HAVE A  
GOOD HOLD ON THE PATTERN BUT DIFFER IN SYSTEM  
TIMING/STRENGTH/TRACK WITHIN THE FLOW. A CONSENSUS BLEND OF THE  
GFS/ECMWF/UKMET SERVED AS A GOOD STARTING POINT WITH A TREND  
TOWARD THE ENSEMBLE MEANS BY NEXT SUN/MON AS THE PATTERN REMAINS  
LARGELY THE SAME. LAKE-EFFECT SNOW WILL BE THE BIGGEST WEATHER  
STORY ASIDE FROM THE CHILL AND APPRECIABLE AMOUNTS WILL BE  
POSSIBLE.  
 
FRACASSO  
 

 
 
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