789  
FXUS01 KWBC 270742  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
242 AM EST TUE NOV 27 2018  
 
VALID 12Z TUE NOV 27 2018 - 12Z THU NOV 29 2018  
 
...HEAVY SNOWFALL WILL IMPACT PARTS OF NEW ENGLAND THROUGH  
TUESDAY, WITH ADDITIONAL SNOWFALL EXPECTED DOWNWIND OF THE GREAT  
LAKES...  
 
...HEAVY PRECIPITATION EXPECTED ACROSS THE PACIFIC NORTHWEST AND  
CALIFORNIA OVER THE NEXT FEW DAYS...  
 
...WELL BELOW NORMAL TEMPERATURES LIKELY ACROSS PARTS OF THE  
MIDWEST...  
 
HEAVY SNOW THAT HAS AFFECTED THE NEW ENGLAND INTERIOR WILL  
CONTINUE TODAY AS A SURFACE LOW LIFTS NORTHWARD ACROSS MAINE. TE  
HEAVIEST AMOUNTS WILL OCCUR IN THE HIGHER ELEVATIONS OF NEW  
ENGLAND AND DOWNWIND OF LAKE ERIE--WHERE TOTAL SNOWFALL  
ACCUMULATIONS BETWEEN 10 TO 20 INCHES ARE EXPECTED. WINTER STORM  
WARNINGS AND WINTER WEATHER ADVISORIES ARE IN EFFECT ACROSS THIS  
REGION THROUGH THIS EVENING. BY TONIGHT, PRECIPITATION WILL BEGIN  
TO TAPER OFF. HOWEVER, LINGERING SHOW SHOWERS WILL LAST THROUGH  
MIDWEEK DOWNWIND OF THE GREAT LAKES. ADDITIONALLY, ACROSS BOTH  
REGIONS - NEW ENGLAND AND THE GREAT LAKES - GUSTY WINDS COMBINED  
WITH HEAVY SNOWFALL WILL RESULT IN HAZARDOUS TRAVEL CONDITIONS.  
 
THE MODERATE TO HEAVY PRECIPITATION IS UNDERWAY ACROSS THE PACIFIC  
NORTHWEST, NORTHERN ROCKIES, AND NORTHERN CALIFORNIA. SNOW AND ICE  
ACCUMULATIONS CAN ALSO BE EXPECTED THROUGHOUT THE PACIFIC  
NORTHWEST IN THE HIGHER ELEVATIONS TODAY. BY WEDNESDAY, A FRONTAL  
SYSTEM WILL BEGIN APPROACHING CALIFORNIA. THIS WILL GIVE WAY TO  
PRECIPITATION WINDING DOWN ACROSS THE PACIFIC NORTHWEST AND  
NORTHERN ROCKIES WHILE SPREADING INTO CENTRAL CALIFORNIA AND  
SOUTHERN CALIFORNIA. AS THIS SYSTEM MOVES INLAND THURSDAY MORNING,  
WIDESPREAD PRECIPITATION WILL CONTINUE FOR CALIFORNIA AND SPREAD  
INTO PARTS OF THE CENTRAL GREAT BASIN AND CENTRAL ROCKIES. A  
MARGINAL RISK OF EXCESSIVE RAINFALL IS POSSIBLE FOR SOUTHWEST  
OREGON/NORTHWEST CALIFORNIA TODAY, STRETCHING INTO CALIFORNIA BY  
WEDNESDAY AND THURSDAY. FURTHERMORE, HEAVY SNOW WILL IMPACT THE  
SIERRA NEVADA--WITH OVER 2 FEET OF TOTAL SNOW ACCUMULATION  
POSSIBLE. MOST OF THIS SNOWFALL WILL OCCUR BETWEEN WEDNESDAY  
EVENING THROUGH LATE THURSDAY NIGHT.  
 
ELSEWHERE, AN UPPER LEVEL DISTURBANCE ALONG WITH A SURFACE  
BOUNDARY WILL MOVE INTO THE NORTHERN PLAINS LATE TUESDAY NIGHT AND  
INTO EARLY WEDNESDAY MORNING. THIS SYSTEM WILL BRING LIGHT SNOW  
AND FREEZING RAIN TO NORTH DAKOTA. TEMPERATURES WILL REMAIN 10 TO  
20 DEGREES BELOW NORMAL FOR THE MISSISSIPPI VALLEY, MIDWEST AND  
OHIO VALLEY TODAY. THE EAST COAST STRETCHING DOWN INTO SOUTH  
FLORIDA WILL ALSO BE BELOW AVERAGE TODAY. HIGH TEMPERATURES WILL  
BEGIN TO SLOWLY REBOUND ON WEDNESDAY FOR THE CENTRAL U.S. WHILE  
REMAINING QUITE CHILLY FOR THE SOUTHEAST. THE WESTERN U.S., HIGH  
PLAINS AND THE SOUTHERN PLAINS WILL REMAIN NEAR OR ABOVE AVERAGE  
THROUGH THE SHORT TERM.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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