536  
FXUS01 KWBC 210712  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
211 AM EST THU DEC 21 2017  
 
VALID 12Z THU DEC 21 2017 - 12Z SAT DEC 23 2017  
   
..HEAVY RAIN ACROSS THE SOUTH AND MORE COLD WEATHER ON THE WAY
 
 
A STRONG UPPER LEVEL DISTURBANCE AND SURFACE LOW PRESSURE  
CURRENTLY OVER THE ROCKIES IS FORECAST TO REACH THE SOUTHERN  
PLAINS BY FRIDAY. A SWATH OF HEAVY RAIN IS EXPECTED TO DEVELOP  
FROM NORTHEAST TEXAS FRIDAY AFTERNOON AND EXTEND TO TENNESSEE AND  
KENTUCKY BY SATURDAY. ABUNDANT GULF OF MEXICO MOISTURE WILL SURGE  
NORTHWARD AND BE LIFTED BY A STRONG COLD FRONT AND UPPER JET  
STREAM SUPPORT. SEVERAL INCHES OF RAINFALL IS LIKELY WITHIN THIS  
CORRIDOR AND THIS WOULD BE ENOUGH TO WARRANT FLOODING CONCERNS FOR  
SOME AREAS. SOME STRONG TO SEVERE THUNDERSTORMS WILL ALSO BE  
POSSIBLE ACROSS PARTS OF TEXAS AND THE DEEP SOUTH.  
 
THE OTHER BIG STORY MAKING WEATHER HEADLINES LATE THIS WEEK WILL  
BE THE MUCH COLDER TEMPERATURES ENVELOPING MUCH OF THE  
NORTH-CENTRAL U.S. AS A LARGE UPPER LEVEL TROUGH BECOMES  
ESTABLISHED OVER THE REGION. SOME OF THE COLDEST WEATHER OF THE  
SEASON THUS FAR IS FORECAST ACROSS THE DAKOTAS AND EXTENDING  
EASTWARD TO MINNESOTA, WITH WIDESPREAD TEENS AND EVEN SINGLE  
DIGITS FOR HIGHS AND LOWS NEAR ZERO. HEAVY SNOW IS EXPECTED FOR  
THE CENTRAL AND NORTHERN ROCKIES, AND A BAND OF MODERATE SNOW FROM  
NORTHERN MICHIGAN TO NEW ENGLAND ON FRIDAY.  
 
D. HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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