518  
FXUS01 KWBC 130720  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
219 AM EST SAT JAN 13 2018  
 
VALID 12Z SAT JAN 13 2018 - 12Z MON JAN 15 2018  
 
...COLD BLAST CONTINUES EASTWARD TODAY WITH SHARPLY COLDER  
TEMPERATURES FOR THE MID-ATLANTIC AND NORTHEAST...  
 
...PERIODS OF HEAVY SNOW EARLY THIS MORNING FOR NORTHERN NEW  
YORK/NEW ENGLAND...  
 
...ROLLER COASTER RIDE OF TEMPERATURES FOR THE CENTRAL TO NORTHERN  
U.S. THROUGH MONDAY..  
 
A STRONG COLD FRONT WILL CONTINUE MOVING THROUGH THE NORTHEAST  
TODAY, FOLLOWED BY SHARPLY COLDER TEMPERATURES IN ITS WAKE. TWENTY  
FOUR HOUR TEMPERATURE CHANGES BEHIND THE COLD FRONT HAVE RANGED  
FROM 20 TO 40 DEGREES FROM THE GREAT LAKES TO THE GULF COAST, AND  
THESE DRAMATIC CHANGES WILL TRANSLATE INTO THE MID-ATLANTIC AND  
NORTHEAST TODAY. TEMPERATURES WILL FALL THIS MORNING BEHIND THE  
COLD FRONT AND WILL NOT RISE MUCH DURING THE DAY. LOCALLY HEAVY  
RAIN FOR NEW ENGLAND WILL CHANGE THIS MORNING TO FREEZING RAIN AND  
SLEET FOLLOWED BY LOCALLY HEAVY SNOW ON THE BACK SIDE IMPACTING  
PORTIONS OF NORTHERN NEW YORK INTO NORTHERN NEW ENGLAND. THE  
GREATEST THREAT FOR FREEZING RAIN ICE ACCUMULATIONS IS EXPECTED  
FROM SOUTHERN NEW HAMPSHIRE INTO EASTERN MAINE WITH UP TO A TENTH  
OF AN INCH ACCRETION POSSIBLE. THE QUICK MOVING NATURE OF THE  
STORM SYSTEM WILL BRING AN END TO THE SNOW FOR MOST OF THE REGION  
BY EARLY AFTERNOON.  
 
ACROSS THE NORTHERN PLAINS INTO KANSAS AND MISSOURI, HIGH  
TEMPERATURES TODAY WILL AVERAGE 15 TO 20 DEGREES BELOW AVERAGE BUT  
WARNING IS EXPECTED FOR SUNDAY AHEAD OF A COLD FRONT DROPPING DOWN  
FROM CANADA. EXPECT NEAR TO SLIGHTLY ABOVE AVERAGE HIGH  
TEMPERATURES FOR SUNDAY ANYWHERE FROM THE CENTRAL PLAINS TO NORTH  
DAKOTA AND MONTANA. HOWEVER, ANOTHER STRONG COLD FRONT ALONG WITH  
LIGHT SNOW WILL SURGE THROUGH THE PLAINS BY MONDAY MORNING  
BRINGING TEMPERATURES BACK BELOW AVERAGE. IN FACT, MONDAY'S HIGHS  
WILL BE COLDER THAN SATURDAY'S FORECAST WITH TEMPERATURES RANGING  
BETWEEN 15 AND 30 DEGREES BELOW AVERAGE.  
 
UPPER LEVEL RIDGING WILL DOMINATE THE PATTERN OVER THE WESTERN  
U.S. THROUGH THE WEEKEND ALLOWING FOR DRY CONDITIONS WITH  
TEMPERATURES ABOVE AVERAGE. A CHANGE IN THE PATTERN IS ANTICIPATED  
STARTING MONDAY WITH THE ARRIVAL OF A COLD FRONT TO THE WEST COAST  
ALONG WITH RAIN FROM NORTHERN CALIFORNIA INTO THE PACIFIC  
NORTHWEST.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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