535  
FXUS01 KWBC 310729  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
229 AM EST WED JAN 31 2018  
 
VALID 12Z WED JAN 31 2018 - 12Z FRI FEB 02 2018  
   
..HEAVY SNOW POSSIBLE OVER THE UPPER GREAT LAKES
 
 
   
..SNOW FOR THE NORTHERN ROCKIES AND CENTRAL APPALACHIANS
 
 
   
..RAIN CONTINUES OVER THE NORTHWEST
 
 
A FRONT EXTENDING FROM THE UPPER GREAT LAKES TO THE MIDDLE  
MISSISSIPPI VALLEY INTO THE CENTRAL ROCKIES WILL MOVE EASTWARD TO  
THE NORTHERN/CENTRAL APPALACHIANS ACROSS PARTS OF THE LOWER  
MISSISSIPPI VALLEY/WESTERN GULF COAST BY THURSDAY EVENING. THE  
STORM WILL PRODUCE SNOW OVER PARTS OF THE UPPER GREAT LAKES INTO  
PARTS OF THE UPPER MISSISSIPPI VALLEY AND NORTHERN ROCKIES THAT  
WILL MOVE INTO THE LOWER GREAT LAKES/NORTHEAST BY WEDNESDAY  
MORNING. OVERNIGHT WEDNESDAY, THE SNOW MOVES INTO PARTS OF  
NORTHERN NEW ENGLAND, ENDING BY THURSDAY AFTERNOON. IN ADDITION  
OVERNIGHT WEDNESDAY, A SECONDARY BOUNDARY MOVES INTO THE UPPER  
GREAT LAKES PRODUCING MORE SNOW OVER PARTS OF THE UPPER GREAT  
LAKES/UPPER MISSISSIPPI VALLEY THAT WILL CONTINUE OVER THE GREAT  
LAKES THROUGH THURSDAY EVENING. ON THURSDAY AS THE PRIMARY FRONT  
MOVES INTO THE APPALACHIANS, SNOW AND RAIN DEVELOP OVER THE OHIO  
VALLEY WITH THE RAIN AND SNOW MOVING INTO THE NORTHERN/CENTRAL  
APPALACHIANS BY THURSDAY EVENING. ADDITIONALLY, RAIN WILL DEVELOP  
ALONG THE BOUNDARY OVER THE SOUTHERN OHIO VALLEY/TENNESSEE VALLEY  
INTO PARTS OF THE LOWER MISSISSIPPI VALLEY LATER ON THURSDAY  
MORNING. THE RAIN WILL CONTINUE ALONG THE FRONT FROM THE LOWER  
MISSISSIPPI VALLEY INTO THE SOUTHERN OHIO/TENNESSEE VALLEYS  
THROUGH THURSDAY EVENING.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER THE NORTHERN ROCKIES WILL MOVE  
SOUTHEASTWARD TO THE MIDDLE MISSISSIPPI VALLEY BY THURSDAY  
EVENING. THE ENERGY WILL AID IN PRODUCING SNOW OVER PARTS OF THE  
NORTHERN ROCKIES THAT WILL CONTINUE OVER THE REGION THROUGH  
THURSDAY EVENING. DOME OF THE SNOW MOVES INTO PARTS OF THE CENTRAL  
ROCKIES ON THURSDAY MORNING WANING BY THURSDAY EVENING.  
FURTHERMORE, ONSHORE FLOW WILL AID IN PRODUCING COASTAL RAIN AND  
HIGHER ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST THAT  
WILL CONTINUE INTO THURSDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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