482  
FXUS01 KWBC 260759  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
258 AM EST TUE DEC 26 2017  
 
VALID 12Z TUE DEC 26 2017 - 12Z THU DEC 28 2017  
   
..FREEZING RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST
 
 
   
..EXPECT SNOW ACROSS THE CASCADES AND NORTHERN ROCKIES
 
 
   
..GREAT LAKES TO EXPERIENCE LAKE EFFECT SNOW
 
 
A WAVY, STALLED FRONT DRAPED FROM THE PACIFIC NORTHWEST TO THE  
CENTRAL ROCKIES HAS GENERATED COASTAL RAIN AND MOUNTAIN SNOW;  
WHICH WILL PERSIST THROUGH MIDWEEK, ESPECIALLY AS ANOTHER SYSTEM  
APPROACHES FROM THE PACIFIC. FREEZING RAIN WILL BE POSSIBLE IN  
SOME OF THE VALLEYS OF WASHINGTON AND OREGON TODAY AND ON  
WEDNESDAY AS WARMER AIR LIFTS INTO THE REGION. HIGHER SNOW  
ACCUMULATIONS IS EXPECTED FOR NORTHERN IDAHO AND WESTERN WYOMING.  
 
CANADIAN HIGH PRESSURE WILL CONTINUE TO SLIDE SOUTHEAST INTO THE  
DAKOTAS/UPPER MISSISSIPPI VALLEY AND INTO THE CENTRAL U.S. OVER  
THE NEXT FEW DAYS... KEEPING FRIGID AIR IN PLACE. A VAST PORTION  
OF THE NORTHERN-TIER STATES HAVE WIND CHILL ADVISORIES AND  
WARNINGS IN EFFECT. FURTHER EAST, THE WESTERLY FLOW MOVING ACROSS  
THE GREAT LAKES REGION COMBINED WITH THE INFLUX OF COLD AIR, HEAVY  
LAKE EFFECT SNOW IS EXPECTED FOR THE FAVORED AREAS DOWNWIND OF THE  
LAKES. THIS SETUP IS FORECAST TO PERSIST, AS SUCH, LAKE EFFECT  
SNOW WARNINGS ARE IN EFFECT FOR PARTS OF THE GREAT LAKES. SEE  
WPC'S WINTER WEATHER PRODUCTS FOR MORE DETAIL.  
 
MUCH OF THE SOUTH/GULF STATES WILL HAVE SHOWERS THROUGH AT LEAST  
THURSDAY AS WARM, MOIST AIR LIFTS FROM THE GULF OF MEXICO. A  
TRANSITION ZONE MAY SET UP FROM THE LOWER MISSISSIPPI VALLEY TO  
THE SOUTHERN TENNESSEE VALLEY/APPALACHIANS AS A COLD FRONT SINKS  
THROUGH THE CENTRAL PLAINS, MIDWEST AND TENNESSEE VALLEY. A NARROW  
SWATH OF FREEZING RAIN AND/OR MIXED PRECIPITATION MAY MATERIALIZE  
FROM SOUTHERN ARKANSAS TO SOUTHERN NORTH CAROLINA AS THE TWO AIR  
MASSES COLLIDE.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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