476  
FXUS01 KWBC 120757  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
256 AM EST FRI JAN 12 2018  
 
VALID 12Z FRI JAN 12 2018 - 12Z SUN JAN 14 2018  
 
...SNOW/FREEZING RAIN FROM THE TENNESSEE AND OHIO VALLEYS INTO  
INTERIOR SECTIONS OF THE NORTHEAST TODAY INTO SATURDAY...  
 
...FLOODING POSSIBLE IN THE NORTHEAST DUE TO HEAVY RAIN AND  
MELTING ICE ON AREA RIVERS...  
   
..AN END TO THE BRIEF JANUARY THAW SWEEPS EAST FOR THIS WEEKEND
 
 
A STRONG COLD FRONT, LOCATED BETWEEN THE MISSISSIPPI RIVER AND THE  
APPALACHIANS THIS MORNING, WILL CONTINUE TO SWEEP EAST TODAY AND  
EVENTUALLY CLEAR THE ENTIRE EAST COAST BY SATURDAY AFTERNOON.  
ALTHOUGH IT WILL BE CLOUDY, TODAY'S HIGH TEMPERATURES AHEAD OF THE  
BOUNDARY WILL BE IN THE 50S FOR MUCH OF NEW ENGLAND AND LOWER 70S  
FOR PORTIONS OF THE MID-ATLANTIC STATES. THE WARM TEMPERATURES  
COMBINED WITH RAIN MAY CAUSE FLOODING OVER SNOW COVERED SURFACES  
AND NEAR PARTIALLY FROZEN RIVERS FROM THE CENTRAL APPALACHIANS  
INTO SECTIONS OF NEW ENGLAND.  
 
A SHARP TRANSITION TO COLDER TEMPERATURES IS EXPECTED BEHIND THE  
COLD FRONT WITH 24 HOUR TEMPERATURE DROPS OF 20 TO 40 DEGREES  
EXPECTED, GREATEST ACROSS NORTHERN LOCATIONS. THE TRANSITION TO  
COLDER TEMPERATURES WILL BE CO-LOCATED WITH RAIN, CHANGING TO  
FREEZING RAIN, SLEET AND EVENTUALLY SNOW FOR MANY FROM THE  
TENNESSEE AND OHIO VALLEYS INTO INTERIOR SECTIONS OF THE  
MID-ATLANTIC REGION AND NORTHEAST TODAY AND TONIGHT. IT APPEARS  
LOCATIONS ALONG AND WEST OF I-95 WILL LIKELY SEE SOME SORT OF  
FROZEN PRECIPITATION FROM THIS STORM SYSTEM BETWEEN WILMINGTON, DE  
TO BOSTON, MA. THE HEAVIEST SNOW IS EXPECTED FROM NORTHWESTERN  
PENNSYLVANIA INTO FAR NORTHERN NEW YORK WHERE UPWARDS OF A FOOT OF  
NEW SNOW IS EXPECTED BY SATURDAY MORNING.  
 
THE NORTHERN PLAINS WILL SEE ANOTHER DAY WITH HIGHS NEAR OR BELOW  
ZERO WITH THE ANOMALOUS COLD STRETCHING DOWN TO THE CENTRAL GULF  
COAST. FORECAST HIGHS WILL BE IN THE 40S FOR SOUTHERN LOUISIANA  
TODAY THROUGH THE WEEKEND, OR ROUGHLY 10 TO 20 DEGREES BELOW  
AVERAGE.  
 
LIGHT TO LOCALLY MODERATE SNOWFALL IS ANTICIPATED ALONG THE HIGHER  
TERRAIN FROM THE WASHINGTON CASCADES INTO THE NORTHERN AND CENTRAL  
ROCKIES TIED TO A WEAKENING PACIFIC STORM SYSTEM AND RESULTING  
UPSLOPE FLOW THROUGH SATURDAY MORNING. RAIN WILL STAY IN THE  
FORECAST FOR THE PACIFIC NORTHWEST BUT WILL BE CONFINED TO MOSTLY  
COASTAL WASHINGTON TONIGHT INTO SATURDAY WITH CLEARING EXPECTED ON  
SUNDAY AS UPPER LEVEL RIDGING BUILDS OVER THE WESTERN U.S.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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