857  
FXUS01 KWBC 110730  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
229 AM EST THU JAN 11 2018  
 
VALID 12Z THU JAN 11 2018 - 12Z SAT JAN 13 2018  
 
...WINTER STORM UNFOLDING ACROSS THE PLAINS WILL MOVE EASTWARD  
FROM THE MISSISSIPPI VALLEY TO NEW ENGLAND...  
   
..HEAVY SNOW EXPECTED FOR CASCADES AND NORTHERN ROCKIES
 
 
...ABOVE AVERAGE TEMPERATURES FOR JANUARY EXPECTED EAST OF THE  
MISSISSIPPI VALLEY OVER THE NEXT FEW DAYS...  
 
A STRONG COLD FRONT FOLLOWED BY AN ARCTIC AIRMASS WILL SWIFTLY  
MOVE EASTWARD FROM THE PLAINS THROUGH THE MISSISSIPPI VALLEY  
TODAY. LATE THURSDAY NIGHT AND FRIDAY, THE FRONT WILL PUSH ACROSS  
THE OHIO AND TENNESSEE VALLEYS IN ADDITION TO THE SOUTHEAST.  
FINALLY, BY FRIDAY NIGHT AND INTO SATURDAY, THE COLD FRONT WILL  
APPROACH THE EAST COAST AND LINGER IN NEW ENGLAND BY SATURDAY.  
PRECIPITATION WILL FOLLOW BEHIND THE FRONT OVER THE NEXT FEW  
DAYS--AND WITH TEMPERATURES FALLING, WINTRY MIX ALONG WITH SNOW  
WILL BE POSSIBLE. ON THURSDAY, THE HEAVIEST MIXED  
PRECIPITATION/ICE WILL OCCUR ALONG THE WESTERN EDGES OF THE OHIO  
AND TENNESSEE VALLEYS WITH THE HEAVIEST SNOW IN THE UPPER  
MIDWEST/UPPER GREAT LAKES IN ADDITION TO PORTIONS OF THE OHIO  
VALLEY. WINTRY MIX WILL SPREAD INTO THE INTERIOR OF NEW ENGLAND  
AND THE NORTHEAST ALONG WITH CENTRAL PORTIONS OF THE OHIO AND  
TENNESSEE VALLEYS ON FRIDAY. IN ADDITION, HEAVY SNOW CAN BE  
EXPECTED ALONG THE LOWER GREAT LAKES. THIS WINTER STORM WILL MOVE  
THROUGH NEW ENGLAND ON SATURDAY BY HAVING THE BULK OF WINTRY MIX  
AND SNOW IN THIS REGION. TRAVEL THROUGHOUT THE PLAINS TO THE  
NORTHEAST WILL BE DANGEROUS AS ICY CONDITIONS ARE POSSIBLE. RAIN  
AND EMBEDDED THUNDERSTORMS WILL OCCUR FROM THE SOUTHEAST TO THE  
MID-ATLANTIC OVER THE NEXT FEW DAYS AS THE FRONT MOVES THROUGHOUT  
THESE AREAS. FOR MORE INFORMATION ON THIS EVENT, PLEASE CONSULT  
WPC'S WINTER WEATHER PRODUCTS.  
 
A PACIFIC FRONT WILL APPROACH THE PACIFIC NORTHWEST  
TODAY--BRINGING AN INCREASE IN PRECIPITATION THROUGHOUT THE REGION  
ALONG WITH THE NORTHERN ROCKIES. THIS ACTIVITY WILL CONTINUE INTO  
EARLY FRIDAY MORNING DUE TO ONSHORE FLOW; HOWEVER, IT IS EXPECTED  
TO LIGHTEN UP BY FRIDAY EVENING. HEAVY SNOW IS EXPECTED ACROSS  
THE HIGHER ELEVATIONS OF THE WASHINGTON CASCADES AND THE NORTHERN  
ROCKIES. SOME PRECIPITATION WILL LINGER FRIDAY NIGHT AND INTO  
SATURDAY--THUS LIGHTER AMOUNTS OF HIGHER ELEVATION SNOW CAN ALSO  
BE EXPECTED. BY SATURDAY, CONDITIONS IMPROVE WITH MOST OF THE  
PRECIPITATION TAPERING OFF FOR THIS AREA.  
 
VERY COLD CONDITIONS WILL FOLLOW THE STRONG COLD FRONT DUE TO THE  
ARCTIC AIRMASS FOLLOWING IT. HIGH TEMPERATURES WILL BE BELOW ZERO  
THROUGHOUT THE NORTHERN PLAINS TODAY--AND TEMPERATURES BELOW  
FREEZING ACROSS THE CENTRAL PLAINS AND UPPER MIDWEST. THESE  
TEMPERATURES ARE 10-25 DEGREES BELOW NORMAL FOR THIS TIME OF YEAR.  
CONSEQUENTLY, WIND CHILL ADVISORIES ARE IN EFFECT FOR PORTIONS OF  
THE THE NORTHERN HIGH PLAINS AND NORTHERN PLAINS AS WIND CHILL  
VALUES COULD REACH 30 BELOW ZERO. IN CONTRAST, AREAS EAST OF THE  
MISSISSIPPI VALLEY WILL EXPERIENCE TEMPERATURES UP TO 30 DEGREES  
ABOVE AVERAGE FOR THIS TIME OF YEAR TODAY. BY SATURDAY, MOST AREAS  
IN THE EASTERN U.S. WILL BE NEAR OR BELOW AVERAGE--WITH THE  
EXCEPTION TO COASTAL MID-ATLANTIC/COASTAL NEW ENGLAND.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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