555  
FXUS01 KWBC 211934  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
233 PM EST FRI DEC 21 2018  
 
VALID 00Z SAT DEC 22 2018 - 00Z MON DEC 24 2018  
 
...THREAT OF HEAVY RAIN CONTINUES FOR NEW ENGLAND THROUGH  
TONIGHT...  
 
...ACCUMULATING SNOW FOR THE CENTRAL AND SOUTHERN APPALACHIANS  
THROUGH SATURDAY MORNING...  
   
..WET/SNOWY PATTERN CONTINUES FOR THE NORTHWEST
 
 
A POWERFUL STORM SYSTEM CONTINUES TO IMPACT THE EASTERN U.S. WITH  
ANOMALOUSLY WARM TEMPERATURES IN PLACE FROM THE MID-ATLANTIC INTO  
SOUTHERN NEW ENGLAND ALONG WITH GUSTY WINDS NEAR THE COAST AND  
HEAVY RAIN. AN ANOMALOUSLY MOIST AXIS AHEAD OF THE SYSTEM'S COLD  
FRONT WAS RESPONSIBLE FOR HEAVY RAIN AND FLOODING IN AND AROUND  
THE NEW YORK CITY METROPOLITAN AREA EARLIER TODAY BUT THE HEAVY  
RAIN THREAT GOING THROUGH THE NIGHT WILL BE FARTHER NORTH AND  
EAST. AN ADDITIONAL 1-2 INCHES OF RAIN WILL BE POSSIBLE FOR  
PORTIONS OF NEW ENGLAND TONIGHT WHERE FLOOD WATCHES ARE CURRENTLY  
IN EFFECT. ON THE BACK SIDE OF THE STORM SYSTEM WILL BE COLDER AIR  
FILTERING INTO THE OHIO VALLEY AND NORTHEAST ALLOWING A CHANGEOVER  
FROM RAIN TO SNOW FOR SOME OF THE HIGHER ELEVATIONS OF THE CENTRAL  
AND SOUTHERN APPALACHIANS WHERE MAINLY LIGHT ACCUMULATIONS ARE  
EXPECTED THROUGH LATE SATURDAY MORNING. PRECIPITATION MAY END AS  
LIGHT SNOW FOR PORTIONS OF THE NORTHEAST AS WELL BUT  
ACCUMULATIONS, IF ANY, SHOULD BE VERY LIGHT AWAY FROM THE  
APPALACHIANS. TEMPERATURES WILL BE SIGNIFICANT COOLER AND MUCH  
CLOSER TO AVERAGE FOR THE WEEKEND ACROSS THE EAST. A WEAK STORM  
SYSTEM IS EXPECTED TO BRING LIGHT RAIN/SNOW FROM THE TENNESSEE  
VALLEY INTO NEW ENGLAND (TEMPERATURE DEPENDENT) ON SUNDAY BUT IT  
WILL OTHERWISE BE VERY QUIET TO START THE BEGINNING OF NEXT WEEK.  
 
ACROSS THE PACIFIC NORTHWEST, A FREQUENT SUCCESSION OF SYSTEMS  
WILL AFFECT THE REGION BRINGING A COMBINATION OF LOWER ELEVATION  
RAIN AND MOUNTAIN SNOW TO WASHINGTON, OREGON AND PORTIONS OF THE  
INTERIOR NORTHWEST. THE HEAVIEST PRECIPITATION IS EXPECTED TO  
BEGIN MID-LATE SATURDAY AHEAD OF A STRONG PACIFIC CYCLONE WITH THE  
COLD FRONT MAKING LANDFALL OVERNIGHT. WHILE LOCALLY HEAVY RAIN  
WILL BE POSSIBLE THROUGH SUNDAY, RAINFALL IS EXPECTED TO BE SPREAD  
OUT ENOUGH OVER TIME TO NOT CAUSE FLOODING CONCERNS.  
 
THE MIDDLE OF THE NATION WILL BE BETWEEN STORM SYSTEMS WITH A  
RELATIVELY QUIET PATTERN IN PLACE. ANY PRECIPITATION OVER THE NEXT  
2-3 DAYS WILL BE LIGHT WITH TEMPERATURES GENERALLY ABOVE AVERAGE.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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