768  
FXUS01 KWBC 101819  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
118 PM EST MON DEC 10 2018  
 
VALID 00Z TUE DEC 11 2018 - 00Z THU DEC 13 2018  
 
...HEAVY RAIN AND MOUNTAIN SNOW POSSIBLE FROM PORTIONS OF THE  
PACIFIC NORTHWEST TO THE NORTHERN ROCKIES...  
   
..WARMING TEMPERATURES EXPECTED FOR THE CENTRAL U.S
 
 
THE SYSTEM WHICH BROUGHT A MAJOR WINTER STORM TO PORTIONS OF THE  
SOUTHEAST AND MID-ATLANTIC REGIONS OVER THE PAST COUPLE DAYS  
SHOULD BE COMING TO AN END BY THIS EVENING, WITH ONLY A FEW  
SCATTERED AREAS OF LINGERING LIGHT RAIN OR SNOW POSSIBLE THROUGH  
EARLY TONIGHT. FARTHER NORTH, A MOISTURE STARVED LOW PRESSURE  
SYSTEM WILL CROSS THE GREAT LAKES AND PORTIONS OF THE NORTHEAST  
TONIGHT AND TUESDAY, BRINGING SCATTERED AREAS OF LIGHT SNOW. A  
COLD FRONT CROSSING THE ROCKIES TONIGHT WILL BRING AREAS OF  
RELATIVELY LIGHT SNOW. THIS SYSTEM WILL ALSO BE RATHER MOISTURE  
STARVED AS IT REACHES THE CENTRAL U.S. ON TUE, WITH A SCATTERED  
AND RELATIVELY LIGHT WINTRY MIX OF PRECIPITATION POSSIBLE INTO  
WEDNESDAY ACROSS PORTIONS OF THE NORTHERN PLAINS/MIDWEST. THE  
FRONT MAY ALSO GENERATE SCATTERED THUNDERSTORMS ACROSS PORTIONS OF  
THE SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY WED AFTERNOON. AN  
ACTIVE WEATHER PATTERN WILL REMAIN IN PLACE ACROSS THE PACIFIC  
NORTHWEST OVER THE NEXT FEW DAYS, WITH A RELATIVELY STRONG COLD  
FRONT APPROACHING ON TUE, SPREADING HEAVY RAIN AND MOUNTAIN SNOWS  
INLAND. AREAS OF HEAVY SNOW ASSOCIATED WITH THIS SYSTEM MAY ALSO  
SPREAD INTO THE NORTHERN GREAT BASIN AND NORTHERN ROCKIES LATE TUE  
INTO WED. THE HIGHER ELEVATIONS OF THE NORTHERN CASCADES MAY SEE  
SNOWFALL ACCUMULATIONS OF 2 OR MORE FEET THROUGH WED, WITH 1-2  
FEET POSSIBLE FOR PORTIONS OF THE NORTHERN ROCKIES). AFTER A BRIEF  
LULL ACROSS THE PACIFIC NORTHWEST, ANOTHER FRONTAL SYSTEM WILL  
APPROACH LATE WED, BRINGING ANOTHER ROUND OF POTENTIALLY HEAVY  
RAIN AND MOUNTAIN SNOW TO THE REGION.  
 
THE CONTIGUOUS U.S. WILL BE LARGELY CUT OFF FROM ANY SIGNIFICANT  
INCURSIONS OF POLAR/ARCTIC AIR DURING THE SHORT RANGE, AND HIGH  
TEMPERATURES ON TUE AND WED WILL RANGE FROM 10 TO 20 DEG F ABOVE  
AVERAGE ACROSS MUCH OF THE CENTRAL U.S. THE EASTERN SEABOARD WILL  
REMAIN CHILLY (HIGHS 5 TO 10 DEG BELOW AVERAGE), ALTHOUGH  
TEMPERATURES WILL SLOWLY MODERATE THROUGH MID-WEEK.  
 
RYAN  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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