328  
FXUS01 KWBC 300756  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
255 AM EST SAT DEC 30 2017  
 
VALID 12Z SAT DEC 30 2017 - 12Z MON JAN 01 2018  
 
...REINFORCING SHOT OF ARCTIC AIR COULD BRING RECORD LOW  
TEMPERATURES TO PARTS OF THE MIDWEST AND THE EAST COAST ON NEW  
YEAR'S DAY...  
 
...MODERATE TO HEAVY LAKE EFFECT SNOWS WILL CONTINUE DOWNWIND OF  
THE GREAT LAKES...  
 
...HEAVY SNOWFALL OVER THE HIGHER TERRAIN OF THE NORTHWEST SHOULD  
TAPER OFF TONIGHT...  
 
THE BITTER COLD WEATHER WILL CONTINUE TO BE THE STORY ACROSS MUCH  
OF THE U.S. THROUGH THIS WEEKEND AS A STRONG HIGH PRESSURE SYSTEM  
IS BRINGING A REINFORCING SHOT OF ARCTIC AIR FROM CENTRAL CANADA.  
THIS HIGH PRESSURE SYSTEM, WITH A CENTRAL PRESSURE FORECAST TO BE  
ABOVE 1050 MB, WILL SPREAD COLD AND DENSE ARCTIC AIR DOWN ACROSS  
THE PLAINS, AND EASTWARD THROUGH THE EAST COAST DURING THE NEXT  
FEW DAYS, SENDING ACTUAL TEMPERATURES DOWN TO AROUND ZERO DEGREES  
AS FAR SOUTH AS THE NORTHERN BORDER OF OKLAHOMA ON NEW YEAR'S DAY,  
AND INTO THE -30S NEAR THE CANADIAN BORDER ON SUNDAY AND NEW  
YEAR'S DAY. IN FACT, DAILY RECORD LOW TEMPERATURES ARE POSSIBLE  
IN THE MIDWEST AND PARTS OF THE EAST COAST ON NEW YEAR'S DAY.  
MEANWHILE, A CLIPPER LOW PRESSURE SYSTEM DEVELOPING ON THE LEADING  
EDGE OF THE ARCTIC AIR WILL BRING A PERIOD OF LIGHT SNOW TODAY  
FROM THE OHIO VALLEY ACROSS THE APPALACHIANS, AND INTO THE  
NORTHERN MID-ATLANTIC BEFORE REACHING SOUTHERN NEW ENGLAND THIS  
AFTERNOON AND EVENING. ACROSS THE GREAT LAKES, WESTERLY FLOW ON  
THE BACKSIDE OF THIS SYSTEM WILL ALLOW FOR MODERATE TO HEAVY  
LAKE-EFFECT SNOWS TO CONTINUE DOWNWIND OF THE LAKES WITH LOCALIZED  
TOTALS OF 6 TO 12+ INCHES POSSIBLE.  
 
A DEVELOPING WAVE OF LOW PRESSURE IN THE WESTERN GULF OF MEXICO  
WILL BRING LIGHT RAIN ACROSS EASTERN TEXAS TODAY, SPREADING  
EASTWARD INTO THE CENTRAL GULF STATES ON SUNDAY, AND INTO FLORIDA  
BY NEW YEAR'S DAY. SOME MIXED PRECIPITATION OR FREEZING RAIN WILL  
ALSO BE POSSIBLE ON THE NORTHERN EDGE OF THE MOISTURE SHIELD FROM  
NORTHERN TEXAS TO CENTRAL MISSISSIPPI AND ALABAMA, AS TEMPERATURES  
ARE FORECAST TO DROP TOWARD THE FREEZING MARK NEAR THE CENTRAL  
GULF ON NEW YEAR'S DAY.  
 
OUT WEST, HEAVY SNOWFALL WILL CONTINUE FOR A WHILE EARLY TODAY  
ACROSS THE NORTHERN INTERMOUNTAIN WEST INTO THE NORTHERN HIGH  
PLAINS AS PACIFIC MOISTURE ALOFT OVERRUNS THE COLD AND DENSE  
ARCTIC AIR AT THE SURFACE. THE SNOW IS EXPECTED TO TAPER OFF  
TONIGHT AS THE STRONG ARCTIC HIGH FROM CANADA SETTLES INTO THE  
REGION WHILE COASTAL RAIN IN THE PACIFIC NORTHWEST ENDS.  
ELSEWHERE, MUCH OF THE REST OF THE WESTERN U.S. SHOULD REMAIN DRY  
WITH MILDER THAN NORMAL TEMPERATURES AS WE HEAD INTO THE NEW YEAR.  
 
KONG  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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