154  
FXUS01 KWBC 122020  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
320 PM EST FRI JAN 12 2018  
 
VALID 00Z SAT JAN 13 2018 - 00Z MON JAN 15 2018  
   
..HEAVY SNOW POSSIBLE FROM THE OHIO VALLEY INTO THE NORTHEAST
 
 
...RAIN/FREEZING RAIN/SLEET POSSIBLE CENTRAL APPALACHIANS TO THE  
NORTHEAST...  
   
..HEAVY RAIN POSSIBLE ALONG NEW ENGLAND COAST
 
 
A STRONG FRONT OVER THE EASTERN PORTION OF THE COUNTRY WILL MOVE  
EASTWARD OFF THE EASTERN SEABOARD BY SATURDAY AFTERNOON. THE  
SYSTEM WILL PRODUCE RAIN WITH POSSIBLE EMBEDDED THUNDERSTORMS OVER  
THE SOUTHERN MID-ATLANTIC/SOUTHEAST COAST THROUGH EARLY SATURDAY  
MORNING. RAIN WILL ALSO DEVELOP OVER PARTS OF THE NORTHEAST TO  
THE CENTRAL/SOUTHERN APPALACHIANS THAT WILL END SOUTH TO NORTH  
ALONG THE EAST COAST BY SATURDAY EVENING. THE SYSTEM WILL ALSO  
PRODUCE SNOW FROM PARTS OF THE TENNESSEE VALLEY INTO THE LOWER  
GREAT LAKES THAT WILL MOVE INTO THE CENTRAL APPALACHIANS INTO THE  
NORTHEAST BY SATURDAY MORNING. THE SNOW WILL BE HEAVY AT TIMES.  
THE SNOW WILL START TO WIND DOWN ON SATURDAY AFTERNOON FROM THE  
CENTRAL APPALACHIANS INTO THE NORTHERN MID-ATLANTIC AND ENDING  
OVER THE NORTHEAST BY SATURDAY EVENING. IN ADDITION, ALONG THE  
RAIN/SNOW LINE, A BAND OF RAIN/FREEZING RAIN/SLEET WILL DEVELOP  
FROM THE CENTRAL APPALACHIANS INTO THE NORTHEAST THAT WILL MOCE  
EASTWARD TO THE NORTHERN MID-ATLANTIC INTO NORTHERN NEW ENGLAND BY  
SATURDAY MORNING. THE RAIN/FREEZING RAIN/SLEET WILL SLOWLY END,  
AGAIN SOUTH TO NORTH, OVER THE NORTHEAST BY LATE AFTERNOON ON  
SATURDAY. IN THE WAKE OF THE STORM, LIGHT LAKE EFFECT SNOW WILL  
DEVELOP DOWNWIND FROM GREAT LAKES WINDING DOWN BY SUNDAY MORNING.  
 
MEANWHILE, ONSHORE FLOW WILL STREAM MOISTURE INTO THE NORTHWEST  
THROUGH SATURDAY EVENING. THE ONSHORE FLOW WILL AID IN PRODUCING  
RAIN OVER PARTS OF THE PACIFIC NORTHWEST WITH SNOW AT HIGHER  
ELEVATIONS THROUGH SATURDAY EVENING. ADDITIONALLY, A FRONT  
EXTENDING ALONG THE EAST SIDE OF THE ROCKIES AND COLD HIGH  
PRESSURE BUILDING INTO THE PLAINS WILL AID IN PRODUCING SNOW OVER  
PARTS OF THE NORTHERN/CENTRAL ROCKIES INTO PARTS OF THE CENTRAL  
PLAINS THROUGH LATE FRIDAY EVENING. A WAVE OF LOW PRESSURE OVER  
THE NORTHERN ROCKIES, ON SATURDAY MORNING, WILL MOVE SOUTHEASTWARD  
TO THE CENTRAL HIGH PLAINS BY SUNDAY MORNING. SNOW WILL DEVELOP  
OVER THE NORTHERN ROCKIES ON SATURDAY THAT WILL MOVE SOUTHEASTWARD  
INTO THE CENTRAL/NORTHERN PLAINS OVERNIGHT SATURDAY INTO SUNDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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