347  
FXUS01 KWBC 180628  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
128 AM EST SAT NOV 18 2017  
 
VALID 12Z SAT NOV 18 2017 - 12Z MON NOV 20 2017  
 
...HEAVY PRECIPITATION POSSIBLE OVER PARTS OF THE NORTHWEST, OHIO  
VALLEY, LOWER GREAT LAKES, AND NORTHEAST...  
 
THE FIRST SYSTEM TO IMPACT THE LOWER 48 THIS PERIOD IS A COMPLEX  
LOW PRESSURE CURRENTLY IN THE CENTRAL PLAINS. THE CYCLONE IS  
EXPECTED TO STRENGTHEN AS IT MOVES EAST-NORTHEAST ACROSS THE UPPER  
MIDWEST, GREAT LAKES, AND NORTHEAST, SPREADING HEAVY PRECIPITATION  
AS IT AND ITS ASSOCIATED WARM FRONT APPROACH. IN ITS WAKE, LAKE  
EFFECT SNOWS ARE EXPECTED DOWNWIND OF THE GREAT LAKES WITHIN THE  
MAIN ZONE OF ITS ASSOCIATED COLD ADVECTION.  
 
A STRONG SURFACE HIGH ACROSS THE GREAT BASIN IS EXPECTED TO LEAD  
TO A WEAK SANTA ANA ACROSS PORTIONS OF THE L.A. BASIN TODAY, WHICH  
SHOULD CONTINUE WARMTH ACROSS THE AREA AND LEAD TO ELEVATED FIRE  
WEATHER RISK PER GUIDANCE FROM THE STORM PREDICTION CENTER.  
 
ACROSS THE PACIFIC NORTHWEST, ONSHORE FLOW RAMPS UP AS A COLD  
FRONT APPROACHES THE REGION WHICH SHOULD LEAD TO HEAVY RAINS AND  
HIGHER ELEVATION SNOWS AS THE FRONT MOVES INTO THE AREA.  
 
ROTH  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page