571  
FXUS01 KWBC 111823  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
122 PM EST THU JAN 11 2018  
 
VALID 00Z FRI JAN 12 2018 - 00Z SUN JAN 14 2018  
 
...WINTER STORM UNFOLDING ACROSS THE MIDWEST WILL MOVE EASTWARD  
ACROSS THE MISSISSIPPI VALLEY INTO NEW ENGLAND...  
 
...HEAVY SNOW EXPECTED FOR CASCADES, NORTHERN ROCKIES, AND MUCH OF  
MONTANA...  
 
...FLOODING POSSIBLE IN THE NORTHEAST DUE TO HEAVY RAIN AND  
MELTING ICE AN AREA RIVERS...  
 
A PACIFIC FRONT WILL APPROACH THE PACIFIC NORTHWEST  
TODAY--BRINGING AN INCREASE IN PRECIPITATION THROUGHOUT THE REGION  
ALONG WITH THE NORTHERN ROCKIES OTHER THAN THE IMMEDIATE COAST,  
MOST OF THE PRECIPITATION SHOULD FALL AS SNOW WHICH HAS LED TO A  
SLEW OF WINTER STORM WATCHES AND WARNINGS FROM INTERIOR WASHINGTON  
ACROSS NORTHERN AND EASTERN IDAHO, NORTHWEST WYOMING, AND MUCH OF  
MONTANA. LIGHTER SNOW IS EXPECTED TO SPREAD ACROSS SOUTH DAKOTA  
AND NEBRASKA. PRECIPITATION WILL CONTINUE INTO EARLY FRIDAY  
MORNING DUE TO ONSHORE FLOW, LIGHTENING UP BY FRIDAY EVENING.  
 
A SHARP ARCTIC FRONT TO THE SOUTH OF A COUPLE OF ASSOCIATED  
SURFACE LOWS WILL MOVE EASTWARD THROUGH THE MISSISSIPPI VALLEY  
TODAY BEFORE HEADING ACROSS THE OHIO AND TENNESSEE VALLEYS THROUGH  
THE EAST AND INTO THE OPEN ATLANTIC BY SATURDAY MORNING. COLD  
CONDITIONS WILL FOLLOW THE STRONG COLD FRONT DUE TO THE ARCTIC  
AIRMASS FOLLOWING IT, THOUGH FEW RECORD LOW TEMPERATURES ARE  
ANTICIPATED. HIGH TEMPERATURES WILL BE BELOW ZERO THROUGHOUT THE  
NORTHERN PLAINS TODAY--AND TEMPERATURES BELOW FREEZING ACROSS THE  
CENTRAL PLAINS AND UPPER MIDWEST; 10-25 DEGREES BELOW NORMAL.  
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. AS PRECIPITATION WILL FOLLOW  
BEHIND THE FRONT WITHIN THE COLD AIR, FREEZING RAIN AND SNOW WILL  
BE POSSIBLE BEFORE SPREADING ALONG THE WESTERN EDGES OF THE OHIO  
AND TENNESSEE VALLEYS. THE HEAVIEST SNOW IS EXPECTED IN THE UPPER  
MIDWEST/GREAT LAKES/OHIO VALLEY/INTERIOR NEW ENGLAND. TRAVEL FROM  
THE MIDWEST TO THE NORTHEAST WILL BE DANGEROUS DUE TO THE SNOW AND  
POSSIBLE ICY CONDITIONS. SEE WPC WINTER WEATHER PRODUCTS FOR MORE  
INFORMATION.  
 
AHEAD OF THE COLD FRONT, AREAS EAST OF THE MISSISSIPPI VALLEY WILL  
EXPERIENCE TEMPERATURES UP TO 30 DEGREES ABOVE AVERAGE -- RECORD  
HIGHS ARE POSSIBLE ACROSS THE GREAT LAKES TODAY AND NORTHEAST  
SATURDAY. 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. RAIN AND EMBEDDED THUNDERSTORMS  
WILL OCCUR FROM THE SOUTHEAST INTO THE MID-ATLANTIC OVER THE NEXT  
COUPLE OF DAYS WHILE HEAVY RAINS ARE EXPECTED NEAR COASTAL NEW  
ENGLAND/NEW YORK. A NUMBER OF DAILY PRECIPITATION RECORDS COULD  
FALL ON FRIDAY ACROSS THE NORTHEAST. WHEN COMBINED WITH MELTING  
ICE ON AREA RIVERS, FLOODING IN THE NORTHEAST AND NEAR THE CENTRAL  
APPALACHIANS IS POSSIBLE.  
 
ROTH/REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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