136  
FXUS01 KWBC 080734  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
234 AM EST TUE JAN 08 2019  
 
VALID 12Z TUE JAN 08 2019 - 12Z THU JAN 10 2019  
 
...HEAVY SNOW LIKELY ACROSS PORTIONS OF THE INTERIOR NORTHEAST  
TUESDAY INTO WEDNESDAY...  
   
..HEAVY PRECIPITATION MOVES INTO THE WEST COAST ON TUESDAY
 
 
...MUCH ABOVE NORMAL TEMPERATURES ON TUESDAY QUICKLY CHANGE TO  
BELOW NORMAL BY WEDNESDAY FROM THE NORTHERN PLAINS TO THE OHIO  
VALLEY...  
 
A WEAKENING AREA OF LOW PRESSURE MOVING THROUGH THE GREAT LAKES  
INTO NEW ENGLAND WILL CONTINUE TO ALLOW FOR SOME WINTRY  
PRECIPITATION ACROSS THE REGION THIS MORNING, WITH A LIKELY  
CHANGEOVER TO RAIN OR A RAIN/SNOW MIX FOR MOST BY TUESDAY  
AFTERNOON. A SECOND LOW PRESSURE AREA ENTERS THE NORTHEAST TODAY,  
AND IS EXPECTED TO DEEPEN AS IT MOVES UP THE COAST. THIS STORM  
WILL USHER IN MUCH COOLER AIR RESULTING IN RAIN CHANGING BACK TO  
SNOW WITH MODERATE TO HEAVY SNOW ACCUMULATIONS LIKELY FROM THE  
CENTRAL APPALACHIANS TO INTERIOR PORTIONS OF THE NORTHEAST, AS  
WELL AS DOWNWIND OF THE UPPER GREAT LAKES. THE GREATEST  
ACCUMULATIONS, LIKELY IN EXCESS OF 8 INCHES, IS EXPECTED TO FALL  
FROM UPSTATE NEW YORK TO NORTHERN MAINE. WINTER WEATHER ADVISORIES  
AND WINTER STORM WATCHES ARE IN EFFECT FOR PORTIONS OF THE  
NORTHEAST.  
 
ON THE WEST COAST, THE NEXT ROUND OF PRECIPITATION ARRIVES TUESDAY  
MORNING AS A DEEP LOW PRESSURE SYSTEM MOVES ACROSS THE EASTERN  
PACIFIC. LOCALLY HEAVY RAINFALL IS LIKELY IN THE LOWER ELEVATIONS  
OF NORTHERN CALIFORNIA AND THE PACIFIC NORTHWEST WITH LOCALIZED  
FLASH FLOODING POSSIBLE, ESPECIALLY ALONG FAVORED UPSLOPE REGIONS  
OF NORTHERN CALIFORNIA. ACCUMULATING SNOWS ARE POSSIBLE IN THE  
HIGHEST TERRAIN, PARTICULARLY FROM THE CASCADES TO THE SIERRA  
NEVADA AND EASTWARD INTO PARTS OF THE NORTHERN ROCKIES. LIGHT  
FREEZING RAIN IS ALSO POSSIBLE IN THE LOWER ELEVATIONS OF THE  
CASCADES AND INTO PARTS OF NORTHERN WASHINGTON AND THE NORTHERN  
TIP OF IDAHO.  
 
THE EASTERN HALF OF THE COUNTRY WILL BE WARM TO START THE SHORT  
RANGE PERIOD WITH DAYTIME HIGHS ON TUESDAY AS MUCH AS 20 TO 30  
DEGREES ABOVE NORMAL ACROSS THE OHIO VALLEY AND PARTS OF THE  
MID-ATLANTIC. COLDER AIR ARRIVES BY WEDNESDAY AND LOOKS TO LINGER  
TOWARDS THE END OF THE WORK WEEK. WINDY CONDITIONS ACROSS THE  
NORTHERN PLAINS ARE ALSO LIKELY TO RESULT IN SUB-ZERO WIND CHILL  
VALUES ON WEDNESDAY MORNING. IN THE WEST, TEMPERATURES SHOULD BE  
NEAR NORMAL FOR MOST PLACES WITH SLIGHTLY WARMER AIR ARRIVING BY  
WEDNESDAY.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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