753  
FXUS01 KWBC 280806  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
306 AM EST WED NOV 28 2018  
 
VALID 12Z WED NOV 28 2018 - 12Z FRI NOV 30 2018  
 
...SNOW WILL CONTINUE TO IMPACT NORTHERN NEW ENGLAND WITH  
ADDITIONAL LAKE EFFECT SNOWFALL EXPECTED DOWNWIND OF THE GREAT  
LAKES THROUGH TODAY...  
 
...HEAVY PRECIPITATION IS EXPECTED ACROSS THE PACIFIC NORTHWEST  
AND CALIFORNIA OVER THE NEXT FEW DAYS WITH VERY HEAVY SNOWFALL IN  
THE SIERRA-NEVADA...  
 
...WELL BELOW NORMAL TEMPERATURES ARE LIKELY ACROSS PARTS OF THE  
MIDWEST AND EAST AS TEMPERATURES REBOUND TO WELL ABOVE NORMAL OVER  
THE HIGH PLAINS...  
 
THE HEAVY SNOW EVENT ACROSS NORTHERN NEW ENGLAND IS UNDERWAY THIS  
MORNING AND IS EXPECTED TO CONTINUE THROUGH TODAY. THE SURFACE LOW  
IS EXPECTED TO MOVE AWAY FROM MAINE BY THIS AFTERNOON AND WILL BE  
WELL OFFSHORE BY TONIGHT. IN THE MEANTIME, HEAVY SNOW WILL  
CONTINUE FROM UPSTATE NEW YORK THROUGH WESTERN MAINE.  
ADDITIONALLY, STRONG AND COLD NORTHWEST FLOW OVER THE GREAT LAKES  
WILL BRING HEAVY LAKE-EFFECT SNOW DOWNWIND OF LAKE ERIE AND  
ONTARIO--WHERE UPWARDS OF 10 TO 12 INCHES OF ADDITIONAL SNOW CAN  
BE EXPECTED. THE SNOWFALL COMBINED WITH THE STRONG WINDS ARE  
EXPECTED TO RESULT IN HAZARDOUS TRAVEL CONDITIONS. BY THURSDAY  
MORNING, AS THE LOW PRESSURE SYSTEM CONTINUES TO MOVE FARTHER INTO  
THE ATLANTIC, SNOWFALL WILL BEGIN TO DWINDLE--COMPLETELY DRYING  
OUT BY THURSDAY EVENING. IN TERMS OF TEMPERATURES, EXPECT BELOW  
NORMAL TEMPERATURES THROUGH THURSDAY.  
 
A WET, ACTIVE PATTERN WILL CONTINUE FOR THE WEST OVER THE NEXT FEW  
DAYS ACROSS THE PACIFIC NORTHWEST, CALIFORNIA, AND THE  
NORTHERN/CENTRAL ROCKIES. DEEP ATMOSPHERIC FETCH OF MOISTURE FROM  
THE PACIFIC AND COLDER TEMPERATURES CONTINUES TO CROSS THE WEST  
COAST AND WELL INLAND ACROSS THE INTERMOUNTAIN REGION. THE  
HEAVIEST RAINFALL TODAY IS EXPECTED TO OCCUR IN NORTHERN AND  
CENTRAL CALIFORNIA--WITH LIGHTER AMOUNTS IN THE PACIFIC NORTHWEST  
AND INTERMOUNTAIN WEST. THIS IS GIVING WAY TO HEAVY RAINFALL AND  
HEAVY SNOWFALL--ESPECIALLY TO THE SIERRA NEVADA WHERE A FOOT OF  
SNOW ABOVE 4,000 FEET COULD OCCUR--WITH LOCALIZED AMOUNTS OF UP TO  
3 FEET. THE HEAVY PRECIPITATION WILL CONTINUE ON THURSDAY ACROSS  
CALIFORNIA AS A FRONTAL SYSTEM MOVES ACROSS THE STATE TOWARD THE  
CENTRAL GREAT BASIN. BY FRIDAY, PRECIPITATION WILL SHIFT MOSTLY  
TO THE GREAT BASIN WITH SOME LINGERING SHOWERS AND HIGHER  
ELEVATION SNOW OCCURRING IN CALIFORNIA AND PARTS OF THE PACIFIC  
NORTHWEST. THE WINTER STORM WARNING FOR THE SIERRA NEVADA MOUNTAIN  
RANGE IS EXPECTED TO LAST THROUGH FRIDAY MORNING. BECAUSE OF THE  
RECENT BURN SCARS IN COMBINATION WITH HEAVY RAINFALL OVER SEVERAL  
DAYS, FLASH FLOODING IS A CONCERN FOR PARTS OF CALIFORNIA. SEE  
WPC'S EXCESSIVE RAINFALL DISCUSSION FOR MORE INFORMATION.  
 
ELSEWHERE, AN UPPER LEVEL DISTURBANCE AND ASSOCIATED SURFACE LOW  
WILL DROP SOUTHEAST FROM CANADA INTO THE NORTHERN PLAINS TODAY,  
MOVING INTO THE UPPER MIDWEST BY TOMORROW. THIS SYSTEM WILL BRING  
LIGHT SNOW AND FREEZING RAIN TO PORTIONS OF THE DAKOTAS AND ALSO  
MINNESOTA. THE HIGH PLAINS SOUTHWARD INTO THE SOUTHERN PLAINS CAN  
EXPECT TEMPERATURES TO BE WELL ABOVE AVERAGE OVER THE NEXT FEW  
DAYS. BECAUSE OF THE ACTIVE PATTERN ACROSS THE WEST, EXPECT BELOW  
AVERAGE TEMPERATURES FOR CALIFORNIA AND THE CENTRAL GREAT  
BASIN--WITH NEAR NORMAL TEMPERATURES FOR THE PACIFIC NORTHWEST AND  
INTERMOUNTAIN WEST.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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