002  
FXUS01 KWBC 222010  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
310 PM EST MON JAN 22 2018  
 
VALID 00Z TUE JAN 23 2018 - 00Z THU JAN 25 2018  
   
..HEAVY SNOW AND RAIN OVER PARTS OF MAINE
 
 
   
..HEAVY SNOW OVER THE CASCADES, SHASTA, AND NORTHERN ROCKIES
 
 
...RAIN/FREEZING RAIN POSSIBLE OVER PARTS OF NORTHERN NEW ENGLAND  
INTO PARTS OF THE UPPER GREAT LAKES...  
   
..HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST
 
 
A STORM OVER PARTS OF THE UPPER/MIDDLE MISSISSIPPI VALLEY WILL  
MOVE NORTHEASTWARD TO SOUTHEASTERN CANADA BY WEDNESDAY. THE  
SYSTEM WILL PRODUCE SNOW OVER PARTS OF THE CENTRAL PLAINS AND  
MIDDLE/UPPER MISSISSIPPI VALLEY INTO THE UPPER GREAT LAKES AND  
OVER NORTHERN NEW ENGLAND THAT WILL END OVER THE CENTRAL PLAINS  
EARLY TUESDAY MORNING. THE SNOW WILL BRIEFLY END OVER NORTHERN  
MAINE ON TUESDAY AFTERNOON RETURNING OVERNIGHT TUESDAY INTO  
WEDNESDAY. ALSO ON TUESDAY AFTERNOON, SNOW WILL START OVER PARTS  
OF THE OHIO VALLEY AND THE HIGHER ELEVATIONS OF THE CENTRAL  
APPALACHIANS AS WELL AS PARTS OF THE NORTHERN MID-ATLANTIC BY  
TUESDAY EVENING. ADDITIONALLY, THE SNOW WILL WIND DOWN OVER PARTS  
OF THE UPPER GREAT LAKES BY TUESDAY EVENING WHILE CHANGING OVER TO  
ALL SNOW OVER THE OHIO VALLEY. BY WEDNESDAY MORNING, SNOW WILL  
EXTEND FROM PARTS OF THE NORTHEAST INTO PARTS OF THE EASTERN OHIO  
VALLEY AND CENTRAL APPALACHIANS.  
 
RAIN WILL ALSO DEVELOP OVER PARTS OF THE MIDDLE MISSISSIPPI  
VALLEY/GREAT LAKES INTO NEW ENGLAND THAT WILL CONTINUE OVER PARTS  
OF THE GREAT LAKES/OHIO VALLEY INTO THE NORTHEAST THROUGH TUESDAY  
MORNING. THE RAIN OVER THE SOUTHERN OHIO VALLEY WILL CHANGE OVER  
TO SNOW BY TUESDAY EVENING. THE RAIN WILL ALSO MOVE OFF THE NEW  
ENGLAND COAST OVERNIGHT TUESDAY. IN THE TRANSITION ZONE BETWEEN  
THE RAIN AND SNOW, BANDS OF RAIN/FREEZING RAIN WILL DEVELOP OVER  
PARTS OF THE GREAT LAKES INTO NEW ENGLAND THAT WILL END OVER THE  
GREAT LAKES BY TUESDAY AFTERNOON AND NEW ENGLAND OVERNIGHT  
TUESDAY. FURTHERMORE, SHOWERS AND THUNDERSTORMS WILL DEVELOP  
ALONG AND AHEAD OF THE ASSOCIATED FRONT FROM PARTS OF THE OHIO  
VALLEY SOUTHWARD TO THE EASTERN GULF COAST BY MONDAY EVENING THAT  
WILL MOVE EASTWARD TO THE MID-ATLANTIC SOUTHWARD TO THE SOUTHEAST  
BY TUESDAY MORNING. THE SHOWERS AND THUNDERSTORMS WILL MOVE OFF  
THE EASTERN SEABOARD BY TUESDAY EVENING.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER THE NORTHERN ROCKIES WILL MOVE  
EASTWARD TO THE NORTHERN/CENTRAL PLAINS BY TUESDAY EVENING. THE  
ENERGY WILL AID IN PRODUCING SNOW OVER PARTS OF NORTHERN  
INTERMOUNTAIN REGION/NORTHERN ROCKIES THAT WILL SLOWLY DISSIPATE  
BY TUESDAY MORNING. A DEEP UPPER-LEVEL TROUGH OVER THE NORTHERN  
PACIFIC WILL MOVE EASTWARD TO THE PACIFIC NORTHWEST AND NORTHERN  
CALIFORNIA COAST BY WEDNESDAY MORNING. A PLUME OF MOISTURE AHEAD  
OF THE TROUGH WILL MOVE INTO PARTS OF THE PACIFIC NORTHWEST BY  
TUESDAY MORNING AND INTO NORTHERN CALIFORNIA TUESDAY EVENING INTO  
WEDNESDAY. THE MOISTURE WILL AID IN PRODUCING COASTAL RAIN AND  
HIGHER ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST ON  
TUESDAY MORNING THAT WILL MOVE INLAND TO THE NORTHERN  
INTERMOUNTAIN REGION BY WEDNESDAY. RAIN AND HIGHER ELEVATION  
SNOW WILL ALSO MOVE INTO PARTS OF NORTHERN CALIFORNIA OVERNIGHT  
TUESDAY INTO WEDNESDAY.  
 
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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