986  
FXUS01 KWBC 162052  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
351 PM EST FRI FEB 16 2018  
 
VALID 00Z SAT FEB 17 2018 - 00Z MON FEB 19 2018  
 
...SNOW POSSIBLE FOR PARTS OF THE CENTRAL APPALACHIANS/NORTHERN  
MID-ATLANTIC INTO PARTS OF NEW ENGLAND...  
   
..HEAVY SNOW POSSIBLE FOR THE CASCADES AND THE NORTHERN ROCKIES
 
 
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST
 
 
A FRONT EXTENDING FROM THE SOUTHERN MID-ATLANTIC TO THE WESTERN  
GULF COAST WILL HAVE A WAVE OF LOW PRESSURE DEVELOP OVER THE  
CENTRAL GULF COAST ON FRIDAY EVENING. THE LOW WILL MOVE  
NORTHEASTWARD TO THE SOUTHERN MID-ATLANTIC COAST BY SATURDAY  
EVENING THEN MOVE OUT OVER THE WESTERN ATLANTIC BY SUNDAY MORNING.  
THE BOUNDARY WILL SETTLE SOUTHWARD OVER THE SOUTHEAST BY SUNDAY  
MORNING AS WELL. THE SYSTEM WILL PRODUCE RAIN OVER PARTS OF  
SOUTHERN NEW ENGLAND/MID-ATLANTIC SOUTHWESTWARD INTO THE TENNESSEE  
VALLEY AND MOVE OFF MOST OF THE NORTHEAST/NORTHERN MID-ATLANTIC BY  
LATE FRIDAY NIGHT AND OFF THE SOUTHERN MID-ATLANTIC COAST BY  
SATURDAY MORNING. THE RAIN MAY CHANGE OVER TO SNOW BRIEFLY BEFORE  
ENDING FROM SOUTHERN NEW ENGLAND TO THE CENTRAL APPALACHIANS  
DURING THE EVENING HOURS ON FRIDAY.  
 
MEANWHILE, MOISTURE MOVING NORTHWESTWARD OVER THE SOUTHERN PLAINS  
FROM THE WESTERN GULF OF MEXICO WILL OVERRUN THE BOUNDARY OVER THE  
WESTERN GULF COAST PRODUCING RAIN OVER PARTS OF THE SOUTHERN  
ROCKIES INTO THE SOUTHERN PLAINS/CENTRAL GULF COAST ON FRIDAY  
EVENING. THE WAVE OF LOW PRESSURE BEGINS TO MOVE NORTHEASTWARD  
INTO THE TENNESSEE VALLEY, BY SATURDAY AS THE ASSOCIATED RAIN  
MOVES INTO PARTS OF THE LOWER/MIDDLE MISSISSIPPI VALLEY INTO PARTS  
OF THE SOUTHERN PLAINS BY SATURDAY MORNING AND END OVER THE  
SOUTHERN ROCKIES/SOUTHERN HIGH PLAINS OVERNIGHT FRIDAY. THE RAIN  
WILL MOVE INTO THE SOUTHERN OHIO/TENNESSEE VALLEYS ON SATURDAY  
MOVING INTO THE MID-ATLANTIC BY SATURDAY EVENING. IN ADDITION BY  
SATURDAY EVENING, SNOW WILL DEVELOP OVER PARTS OF THE NORTHERN  
MID-ATLANTIC MOVING INTO PARTS OF NEW ENGLAND OVERNIGHT SATURDAY  
INTO SUNDAY MORNING. THE RAIN WILL MOVE OFF THE MID-ATLANTIC  
COAST BY SUNDAY MORNING WHILE ENDING OVER THE SOUTHERN  
MID-ATLANTIC INTO THE CENTRAL GULF COAST OVERNIGHT SATURDAY.  
 
ADDITIONALLY, A FRONT WILL MOVE SOUTHWARD OUT OF CENTRAL CANADA  
OVERNIGHT FRIDAY MOVING TO THE UPPER MISSISSIPPI VALLEY/NORTHERN  
PLAINS BY SATURDAY MORNING. THE FRONT WILL CONTINUE TO MOVE  
EASTWARD TO THE GREAT LAKES WESTWARD TO A WAVE OF LOW PRESSURE  
OVER THE NORTHERN PLAINS ON SUNDAY MORNING. LIGHT SNOW WILL  
DEVELOP ALONG THE BOUNDARY BY SATURDAY MORNING OVER THE UPPER  
MISSISSIPPI VALLEY MOVING INTO PARTS OF THE UPPER GREAT LAKES BY  
SATURDAY EVENING AND INTO PARTS OF THE NORTHEAST BY SUNDAY  
MORNING.  
 
IN THE MEANTIME, UPPER-LEVEL ENERGY OVER THE NORTHERN  
INTERMOUNTAIN REGION WILL MOVE QUICKLY TO THE NORTHEAST COAST BY  
SUNDAY. ONSHORE FLOW AND THE ENERGY WILL AID IN DEVELOPING RAIN  
OVER PARTS OF THE PACIFIC NORTHWEST AND SNOW OVER THE NORTHERN  
INTERMOUNTAIN REGION/NORTHERN ROCKIES OF FRIDAY EVENING. THE SNOW  
WILL EXPAND INTO PARTS OF THE NORTHERN HIGH PLAINS BY SATURDAY  
MORNING WHILE THE RAIN CONTINUES OVER THE PACIFIC NORTHWEST. A  
FRONT WITH MORE UPPER-LEVEL ENERGY WILL APPROACH THE PACIFIC  
NORTHWEST ON SATURDAY WITH THE BOUNDARY MOVING INLAND TO PARTS OF  
THE NORTHERN INTERMOUNTAIN REGION BY SATURDAY EVENING. THE FRONT  
WILL MOVE SOUTHWARD OVER THE NORTHERN ROCKIES INTO PARTS OF THE  
GREAT BASIN/NORTHERN CALIFORNIA BY SUNDAY MORNING. AS THE  
BOUNDARY MOVES INLAND ON SATURDAY EVENING INTO SUNDAY, THE SNOW  
LEVELS WILL LOWER WITH SNOW DEVELOPING OVER THE HIGHER ELEVATIONS  
OF THE NORTHWEST OVERNIGHT SATURDAY WITH SNOW DEVELOPING NEAR THE  
NORTHWEST COAST OF WASHINGTON STATE BY SUNDAY. SNOW WILL ALSO  
DEVELOP OVER PARTS OF THE HIGHER ELEVATIONS OF NORTHERN CALIFORNIA  
BY SUNDAY, TOO. SNOW WILL EXTEND FROM PARTS OF THE NORTHERN  
PLAINS TO PARTS OF THE NORTHWEST BY SUNDAY AND RAIN ALONG PARTS OF  
THE NORTHWEST COAST INTO THE NORTHERN CALIFORNIAN COAST.  
 
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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