462  
FXUS01 KWBC 202032  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
332 PM EST SAT JAN 20 2018  
 
VALID 00Z SUN JAN 21 2018 - 00Z TUE JAN 23 2018  
 
...HEAVY SNOW POSSIBLE FROM PARTS OF THE CENTRAL PLAINS TO THE  
UPPER MISSISSIPPI VALLEY...  
 
...RAIN/FREEZING RAIN POSSIBLE OVER PARTS OF THE CENTRAL PLAINS TO  
THE GREAT LAKES...  
   
..HEAVY SNOW POSSIBLE OVER THE CASCADES
 
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST AND  
NORTHERN CALIFORNIA...  
 
A STORM OVER THE CENTRAL ROCKIES WILL MOVE EASTWARD TO THE MIDDLE  
MISSISSIPPI VALLEY BY MONDAY. THE SYSTEM WILL PRODUCE SNOW AND  
LOWER ELEVATION RAIN OVER PARTS OF THE NORTHERN/CENTRAL ROCKIES  
AND PARTS OF THE GREAT BASIN/SOUTHWEST THAT WILL EXPAND EASTWARD  
INTO THE SOUTHERN ROCKIES AND PARTS OF THE NORTHERN/CENTRAL PLAINS  
BY SUNDAY MORNING. ON SUNDAY, THE SNOW WILL END OVER PARTS OF THE  
NORTHERN ROCKIES AND THE GREAT BASIN/SOUTHWEST. OVERNIGHT SUNDAY  
INTO MONDAY, THE SNOW WILL MOVE INTO PARTS OF THE UPPER  
MISSISSIPPI VALLEY/UPPER GREAT LAKES. ALSO OVERNIGHT SUNDAY INTO  
MONDAY, SNOW MAY BE HEAVY AT TIMES OVER PARTS OF THE CENTRAL  
PLAINS INTO THE UPPER MISSISSIPPI VALLEY. IN ADDITION ON SUNDAY,  
ALONG THE TRANSITION FROM RAIN TO SNOW OVER THE CENTRAL  
PLAINS/MIDDLE MISSISSIPPI VALLEY A BAND OF RAIN/FREEZING RAIN WILL  
DEVELOP. THE RAIN/FREEZING RAIN AREA WILL EXPAND INTO PARTS OF  
THE UPPER MISSISSIPPI VALLEY/GREAT LAKES OVERNIGHT SUNDAY INTO  
MONDAY, TOO.  
 
MOISTURE FROM THE WESTERN GULF OF MEXICO WILL FLOW NORTHWARD OVER  
PARTS OF THE LOWER MISSISSIPPI VALLEY INTO THE TENNESSEE VALLEY  
OVERNIGHT SATURDAY INTO SUNDAY. ON SUNDAY, A MORE INTENSE  
MOISTURE PLUME WILL MOVE NORTHWARD OVER THE SOUTHERN PLAINS INTO  
THE LOWER/MIDDLE MISSISSIPPI VALLEY AFTERNOON SUNDAY INTO LATE  
SUNDAY NIGHT. BY MONDAY MORNING, THE PLUME OF MOISTURE WILL  
EXTEND FROM THE CENTRAL GULF COAST NORTHWARD TO THE WESTERN OHIO  
VALLEY. THE MOISTURE WILL AID IN PRODUCING LIGHT RAIN OVER PARTS  
OF THE LOWER MISSISSIPPI VALLEY/WESTERN GULF COAST, SATURDAY  
EVENING, THAT WILL EXPAND NORTHWARD OVER THE MIDDLE MISSISSIPPI  
VALLEY/OHIO VALLEY BY SUNDAY MORNING. ON SUNDAY AFTERNOON,  
SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER PARTS OF THE SOUTHERN  
PLAINS THAT WILL EXPAND NORTHEASTWARD INTO THE LOWER/MIDDLE  
MISSISSIPPI VALLEY BY SUNDAY EVENING. BY MONDAY MORNING, THE  
SHOWERS AND THUNDERSTORMS WILL BE CONFINED TO LOWER MISSISSIPPI  
VALLEY/TENNESSEE VALLEY. RAIN WILL ALSO DEVELOP OVER MIDDLE  
MISSISSIPPI VALLEY INTO OHIO VALLEY WITH SOME LIGHT RAIN  
DEVELOPING OVER PARTS OF THE NORTHERN MID-ATLANTIC OVERNIGHT  
SUNDAY INTO MONDAY.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER THE NORTH PACIFIC WILL MOVE  
INLAND OVER THE PACIFIC NORTHWEST TO THE NORTHERN ROCKIES/NORTHERN  
HIGH PLAINS BY MONDAY. THE SYSTEM WILL PRODUCE RAIN AND HIGHER  
ELEVATION SNOW OVER THE PACIFIC NORTHWEST AND SNOW OVER THE  
NORTHERN ROCKIES OVERNIGHT SATURDAY INTO SUNDAY. ON SUNDAY, THE  
RAIN AND HIGHER ELEVATION SNOW WILL MOVE INTO NORTHERN CALIFORNIA  
EXPANDING EASTWARD INTO PARTS OF THE GREAT BASIN/NORTHERN ROCKIES  
BY MONDAY. ELSEWHERE, DEEP LOW PRESSURE OVER EASTERN CANADA WILL  
MOVE EASTWARD OVER THE WESTERN ATLANTIC BY LATE SATURDAY NIGHT.  
CIRCULATION AROUND THE LOW WILL AID IN PRODUCING LIGHT SNOW OVER  
PARTS OF NORTHERN NEW ENGLAND THROUGH SUNDAY MORNING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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