257  
FXUS01 KWBC 290918  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
517 AM EDT SUN OCT 29 2017  
 
VALID 12Z SUN OCT 29 2017 - 12Z TUE OCT 31 2017  
 
...TROPICAL STORM PHILIPPE WILL BECOME ABSORBED INTO FRONTAL ZONE  
ALONG THE EAST COAST BY MONDAY MORNING...  
 
...SEVERE THUNDERSTORMS AND HEAVY RAIN POSSIBLE OVER THE  
NORTHEAST/NORTHERN MID-ATLANTIC...  
 
...LIGHT TO MODERATE SNOW POSSIBLE OVER PARTS OF THE UPPER GREAT  
LAKES, CENTRAL APPALACHIANS, AND PARTS OF THE NORTHERN/CENTRAL  
ROCKIES...  
 
HEAVY THUNDERSHOWERS ARE FORECAST FOR MUCH OF THE MID-ATLANTIC AND  
NORTHEAST TODAY AS A COLD FRONT TRACKS THROUGH THE EASTERN STATES  
AND WARM, MOIST AIR ADVECTS ONSHORE FROM THE ATLANTIC OCEAN.  
PORTIONS OF THE MID-ATLANTIC AND NORTHEAST HAVE A MODERATE RISK OF  
EXCESSIVE RAINFALL, AND PORTIONS OF THE MID-ATLANTIC HAVE A  
MARGINAL RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING.  
LOW PRESSURE ALONG THE BOUNDARY OVER THE SOUTHERN APPALACHIANS  
WILL RAPIDLY DEEPEN WHILE MOVING NORTHWARD TO THE NORTHERN  
APPALACHIANS BY MONDAY MORNING. RAIN, HEAVY AT TIMES, WILL DEVELOP  
ALONG THE FRONT FROM THE CENTRAL APPALACHIANS TO THE LOWER GREAT  
LAKES/NORTHERN APPALACHIANS AND WILL SPREAD TO THE  
NORTHEAST/NORTHERN MID-ATLANTIC BY THIS AFTERNOON.  
 
MEANWHILE, TROPICAL STORM PHILIPPE IS EXPECTED TO BECOME ABSORBED  
AS A TRIPLE POINT LOW OVER THE ATLANTIC AND THEN LIFTING INTO  
SOUTHEASTERN CANADA. SEE THE LATEST ADVISORY FROM THE NATIONAL  
HURRICANE CENTER FOR THE MOST UP TO DATE INFORMATION ON STORM  
TRACK AND INTENSITY. RAIN, HEAVY AT TIMES, WILL DEVELOP OVER PARTS  
OF NORTHERN NEW ENGLAND ON MONDAY. ADDITIONALLY, LIGHT SNOW WILL  
DEVELOP OVER PARTS OF THE HIGHER ELEVATIONS OF THE CENTRAL  
APPALACHIANS OVERNIGHT SUNDAY ENDING ON MONDAY MORNING.  
 
ANOTHER SURGE OF COLD AIR WILL MOVE THROUGH THE CENTRAL U.S. AS A  
LOW PRESSURE SYSTEM MOVES SOUTHEASTWARD TO THE UPPER GREAT  
LAKES/WESTERN OHIO VALLEY SOUTHWESTWARD INTO THE SOUTHERN HIGH  
PLAINS BY MONDAY. RAIN WILL DEVELOP FROM THE NORTHERN HIGH PLAINS  
TO THE UPPER/MIDDLE MISSISSIPPI VALLEY TONIGHT; AND INTO PARTS OF  
THE UPPER GREAT LAKES BY MONDAY. LIGHT TO MODERATE SNOW WILL  
DEVELOP OVER PARTS OF THE NORTHERN/CENTRAL ROCKIES THROUGH THE  
OVERNIGHT HOURS- SOME LOCALIZED AREAS MAY HAVE ACCUMULATIONS OF 4  
TO 8 INCHES. LIGHT SNOW WILL ALSO BE POSSIBLE FOR PORTIONS OF THE  
UPPER MISSISSIPPI VALLEY/UPPER GREAT LAKES TONIGHT THROUGH MONDAY.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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