340  
FXUS01 KWBC 230800  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 AM EST TUE JAN 23 2018  
 
VALID 12Z TUE JAN 23 2018 - 12Z THU JAN 25 2018  
   
..HEAVY SNOW AND RAIN OVER PARTS OF MAINE
 
 
...HEAVY SNOW OVER THE CASCADES, NORTHERN SIERRA NEVADAS, BLUE  
MOUNTAINS, BITTERROOTS 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
 
 
THE WINTER STORM THAT BROUGHT WIDESPREAD SNOW AND FREEZING RAIN TO  
THE CENTRAL/NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY ON MONDAY  
WILL CONTINUE TO LIFT NORTHEAST THROUGH THE LOWER GREAT LAKES  
TODAY AND EXITING NEW ENGLAND BY VERY EARLY ON WEDNESDAY.  
PRECIPITATION MAY GO THROUGH A BRIEF TRANSITION PERIOD WHERE  
FREEZING RAIN WILL OCCUR THIS AFTERNOON; BUT WILL CHANGE OVER TO  
ALL SNOW AS IT CONTINUES ACROSS PORTIONS OF THE GREAT LAKES REGION  
AND THE NORTHEAST THROUGH WEDNESDAY. WINTER WEATHER ADVISORIES AND  
WINTER STORM WARNINGS REMAIN IN EFFECT FOR PARTS OF THE GREAT  
LAKES REGION AND MUCH OF NEW ENGLAND. ADDITIONALLY, AS THE  
ASSOCIATED COLD FRONT PASSES THROUGH THE OHIO VALLEY, SNOW WILL  
WILL DEVELOP AND SPREAD TO THE HIGHER ELEVATIONS OF THE CENTRAL  
APPALACHIANS, AS WELL AS, PARTS OF THE NORTHERN MID-ATLANTIC BY  
LATE AFTERNOON/EVENING.  
 
SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ALONG AND AHEAD OF THE  
TRAILING FRONT AND ARE SPREADING EASTWARD TOWARD THE MID-ATLANTIC  
AND SOUTHEAST. THE SHOWERS AND THUNDERSTORMS ARE EXPECTED TO EXIT  
THE EASTERN SEABOARD TONIGHT.  
 
THE PACIFIC NORTHEAST AND NORTHERN CALIFORNIA WILL REMAIN IN A  
PERSISTENT WET PATTERN AS UPPER-LEVEL ENERGY AND ONSHORE FLOW  
SPREADS RAIN AND MOUNTAIN SNOW ACROSS THE REGION. A PLUME OF  
MOISTURE AHEAD OF AN UPPER-LEVEL TROUGH WILL MOVE INTO PARTS OF  
THE PACIFIC NORTHWEST TODAY AND WILL EXPAND SOUTH INTO NORTHERN  
CALIFORNIA TONIGHT AND WEDNESDAY. COASTAL RAIN AND HIGHER  
ELEVATION SNOW IS FORECAST FOR MUCH OF NORTHWEST TODAY AND FOR TO  
THE NORTHERN INTERMOUNTAIN REGION BY WEDNESDAY. SNOW WILL BE HEAVY  
FOR MOST OF THE CASCADES, NORTHERN PORTIONS OF THE SIERRAS  
NEVADAS, THE BLUE MOUNTAINS, THE BITTERROOTS AND THE NORTHERN  
ROCKIES IN THIS SETUP.  
 
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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