128  
FXUS01 KWBC 220758  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
257 AM EST FRI DEC 22 2017  
 
VALID 12Z FRI DEC 22 2017 - 12Z SUN DEC 24 2017  
 
...THERE IS A MODERATE RISK OF FLASH FLOODING ACROSS PORTIONS OF  
THE SOUTH...  
 
...ICY CONDITIONS ALONG WITH SNOW MAY IMPACT TRANSPORTATION FROM  
THE GREAT LAKES AND NEW ENGLAND...  
 
..BITTERLY COLD TEMPERATURES EXPECTED ACROSS THE NORTHERN PLAINS  
AND NORTHERN ROCKIES...  
 
WIDESPREAD SHOWERS AND THUNDERSTORMS WILL SETUP OVER THE SOUTHERN  
PLAINS, LOWER/MIDDLE MISSISSIPPI VALLEY AND THE TENNESSEE VALLEY  
AS WARM, MOIST GULF AIR TRANSPORTS NORTH AHEAD OF A COLD FRONT.  
WITH AN EXPECTED SLOW EASTERN PROGRESSION WITH THIS SYSTEM, AN  
AXIS OF HIGHER RAINFALL AMOUNTS IS FORECAST TO SPAN FROM SOUTHERN  
ARKANSAS TO SOUTHERN KENTUCKY- INVOKING AN AREA WITH A MODERATE  
RISK FOR FLASH FLOODING TODAY. AS THE PRECIPITATION AND FRONT  
SHIFTS TO THE EAST ON SATURDAY THE AREA OF ELEVATED RISK WILL  
SETUP OVER THE EASTERN TENNESSEE VALLEY/CENTRAL APPALACHIANS.  
 
BY SATURDAY AFTERNOON, THE COLD FRONT QUICKLY MOVES TOWARD THE  
EAST COAST. RAINFALL WILL STILL OCCUR ALONG AND AHEAD OF THE FRONT  
BY SATURDAY AFTERNOON ALBEIT NOT NEARLY AS HEAVY. A CLIPPER SYSTEM  
WILL DROP THROUGH THE NORTHERN AND CENTRAL PLAINS WHICH WILL  
REINFORCE COLD AIR OVER THE CENTRAL U.S. AND THE GREAT LAKES  
REGION. THIS DOES NOT BODE WELL FOR TRAVEL OVER THE NEXT FEW DAYS  
AS PRECIPITATION WILL LIKELY BE A MIX OF ICE AND SNOW FROM THE  
GREAT LAKES TO NEW ENGLAND. FREEZING RAIN ALONG WITH SNOW WILL  
SPREAD NORTHWARD ACROSS THE NORTHEAST TODAY AND INTO SATURDAY  
MORNING AS THE FRONTAL BOUNDARY LIFTS NORTH. PLEASE SEE WPC'S  
WINTER WEATHER PRODUCTS AND DISCUSSION FOR MORE INFORMATION  
PERTAINING TO THE WINTER WEATHER HAZARDS ASSOCIATED WITH THIS  
SYSTEM.  
 
ARCTIC AIR WILL SURGE SOUTHWARD ALONG THE NORTHERN ROCKIES AND  
INTO THE NORTHERN PLAINS. TEMPERATURES ACROSS THIS SECTOR WILL  
PLUMMET INTO THE TEENS ABOVE ZERO, WHICH ON AVERAGE WILL BE 20  
DEGREES BELOW NORMAL FOR LATE DECEMBER. LOCATIONS AHEAD OF THE  
COLD FRONT PRESSING EASTWARD FROM THE PLAINS TO THE EAST  
COAST--HIGH TEMPERATURES WILL BE ABOUT 15 DEGREES ABOVE NORMAL.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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