062  
FXUS01 KWBC 010727  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
227 AM EST THU FEB 01 2018  
 
VALID 12Z THU FEB 01 2018 - 12Z SAT FEB 03 2018  
   
..RAIN AND SNOW OVER THE CASCADES
 
 
   
..RAIN CONTINUES OVER PARTS OF THE PACIFIC NORTHWEST
 
 
...SNOW POSSIBLE OVER THE GREAT LAKES AND INTO THE  
CENTRAL/SOUTHERN APPALACHIANS...  
   
..SNOW POSSIBLE OVER PARTS OF THE NORTHERN/CENTRAL ROCKIES
 
 
A FRONT EXTENDING FROM THE LOWER GREAT LAKES/OHIO VALLEY INTO THE  
LOWER MISSISSIPPI VALLEY/SOUTHERN PLAINS WILL MOVE OFF THE EASTERN  
SEABOARD OVERNIGHT THURSDAY INTO FRIDAY MORNING. THE SYSTEM WILL  
PRODUCE SNOW FROM THE NORTHEAST TO THE LOWER GREAT LAKES AND OVER  
THE UPPER GREAT LAKES WITH RAIN OVER EASTERN/CENTRAL OHIO VALLEY  
RETURNING TO SNOW OVER THE WESTERN OHIO VALLEY/MIDDLE MISSISSIPPI  
VALLEY ON THURSDAY MORNING. THE SNOW WILL CONTINUE OVER NORTHERN  
NEW ENGLAND AND EXPAND INTO THE CENTRAL APPALACHIANS AND PARTS OF  
THE OHIO VALLEY BY THURSDAY EVENING. THE LIGHT SNOW WILL MOVE  
INTO SOUTHERN NEW ENGLAND AND THE NORTHERN MID-ATLANTIC BY FRIDAY  
MORNING, MOVING OFF THE COAST BY FRIDAY EVENING. THE RAIN WILL  
EXPAND ON THURSDAY INTO SOUTHERN NEW ENGLAND SOUTHWESTWARD TO THE  
LOWER MISSISSIPPI VALLEY BY THURSDAY EVENING. THE RAIN WILL MOVE  
EASTWARD OFF THE SOUTHERN MID-ATLANTIC/SOUTHEAST AND THE  
EASTERN/CENTRAL GULF COAST BY FRIDAY EVENING. IN THE WAKE OF THE  
SYSTEM, LAKE EFFECT SNOW WILL DEVELOP DOWNWIND FROM THE GREAT  
LAKES THURSDAY EVENING INTO FRIDAY EVENING.  
 
MEANWHILE, MULTIPLE UPPER-LEVEL IMPULSES WILL MOVE OVER THE  
NORTHERN/CENTRAL ROCKIES THAT WILL AID IN PRODUCING SNOW THAT WILL  
INCREASE AND DECREASE OVER THE AREA ON THURSDAY INTO FRIDAY  
EVENING. IN ADDITION, ONSHORE FLOW AIDS IN PRODUCING RAIN AND  
HIGHER ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST THROUGH  
FRIDAY EVENING. UPPER-LEVEL RIDGING DEVELOPS OVER THE NORTHWEST  
THROUGH FRIDAY THAT WILL ALLOW THE SNOW LEVELS TO RISE OVER THE  
PACIFIC NORTHWEST.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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