957  
FXUS01 KWBC 172001  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
300 PM EST MON DEC 17 2018  
 
VALID 00Z TUE DEC 18 2018 - 00Z THU DEC 20 2018  
 
...ACTIVE PATTERN CONTINUES FOR THE WEST, WITH RAIN IN LOWER  
ELEVATIONS AND HEAVY SNOW IN HIGHER ELEVATIONS...  
   
..SNOW FOR THE INTERIOR NORTHEAST THROUGH MONDAY NIGHT
 
 
...RAINY FOR THE SOUTHERN PLAINS BY TUESDAY EVENING, MOVING INTO  
THE LOWER MISSISSIPPI VALLEY AND SOUTHEAST BY WEDNESDAY...  
 
STRONG ONSHORE FLOW WILL CONTINUE BRINGING MOISTURE TO THE PACIFIC  
NORTHWEST AND THE NORTHERN GREAT BASIN THROUGH THE FIRST HALF OF  
THE WORKWEEK, AND A FRONTAL SYSTEM MOVING THROUGH IS EXPECTED TO  
ENHANCE PRECIPITATION CHANCES. ALONG THE COAST AND IN LOWER  
ELEVATIONS, THE PRECIPITATION WILL REMAIN RAIN, AND A MARGINAL  
RISK OF EXCESSIVE RAINFALL IS IN PLACE NOW THROUGH WEDNESDAY  
MORNING, WITH AN EMBEDDED SLIGHT RISK IN FAR SOUTHERN OREGON AND  
FAR NORTHERN CALIFORNIA FOR TUESDAY. IN HIGHER ELEVATIONS OF THE  
WASHINGTON CASCADES, SNOWFALL WILL BE MEASURED IN MULTIPLE FEET  
RATHER THAN INCHES, WITH COLDER TEMPERATURES AND ASCENDING AIR  
OVER MOUNTAINS. THROUGH WEDNESDAY, THE NORTHERN ROCKIES COULD SEE  
12 TO 18 INCHES OF SNOW. STRONG WINDS ARE ALSO FORECAST WITH THIS  
EVENT, WITH HIGH WIND WARNINGS AND WATCHES AND WIND ADVISORIES IN  
PLACE.  
 
A LOW PRESSURE SYSTEM OFF THE NEW ENGLAND COAST IS FORECAST TO  
KEEP TRACKING NORTHWARD OVERNIGHT MONDAY INTO THE CANADIAN  
MARITIMES. IN THE MEANTIME, WRAPAROUND SNOWFALL IS EXPECTED FOR  
THE INTERIOR NORTHEAST THROUGH MONDAY NIGHT, WITH 2 TO 4  
ADDITIONAL INCHES POSSIBLE IN EASTERN MAINE.  
 
AN UPPER-LEVEL LOW IS FORECAST TO DEVELOP AND MOVE THROUGH THE  
FOUR CORNERS REGION ON MONDAY NIGHT, TRACKING EASTWARD INTO THE  
PLAINS ON TUESDAY. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO FORM  
AHEAD OF THE UPPER-LEVEL LOW BY TUESDAY EVENING IN THE SOUTHERN  
PLAINS, AND WILL MOVE INTO THE LOWER MISSISSIPPI VALLEY AND  
SOUTHEAST ON WEDNESDAY. RAINFALL IS FORECAST TO BE GENERALLY UNDER  
AN INCH IN THESE AREAS, WITH LOCALLY HIGHER AMOUNTS ABOVE AN INCH.  
 
TEMPERATURE-WISE, A COLD FRONT MOVING THROUGH WILL LEAD TO  
TEMPERATURES 5 TO 15 DEGREES BELOW AVERAGE IN THE NORTHEAST ON  
TUESDAY. FLORIDA COULD SEE SLIGHTLY BELOW AVERAGE TEMPERATURES AS  
WELL. THE REST OF THE U.S. WILL GENERALLY BE WARMER THAN NORMAL;  
THE NORTHERN PLAINS IN PARTICULAR IS EXPECTING HIGH TEMPERATURES  
15 TO 25 DEGREES ABOVE AVERAGE.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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