259  
FXUS01 KWBC 180801  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
300 AM EST FRI JAN 18 2019  
 
VALID 12Z FRI JAN 18 2019 - 12Z SUN JAN 20 2019  
 
...MAJOR WINTER STORM EXPECTED TO MOVE RAPIDLY ACROSS THE MIDWEST  
INTO NEW ENGLAND DURING THE WEEKEND...  
 
...MORE HEAVY RAIN EXPECTED TO IMPACT THE PACIFIC NORTHWEST INTO  
NORTHERN CALIFORNIA DURING THE WEEKEND...  
 
A LOW PRESSURE SYSTEM THAT HAS BEEN TRACKING ACROSS THE PACIFIC  
AND THE WESTERN U.S. FOR THE PAST FEW DAYS IS ABOUT TO EXIT THE  
ROCKIES INTO THE CENTRAL PLAINS. THIS LOW PRESSURE SYSTEM WILL BE  
RE-ENERGIZED OVER THE PLAINS AS IT MERGES WITH A STRONG SURGE OF  
ARCTIC AIR FROM CANADA. WIDESPREAD SNOW COMBINED WITH VERY STRONG  
WINDS WILL SPREAD RAPIDLY ACROSS THE MIDWEST AND PARTS OF THE  
CENTRAL PLAINS ON SATURDAY. AS THE STORM INTENSIFIES FURTHER ON  
SATURDAY NIGHT, HEAVY SNOW IS FORECAST TO DEVELOP AND RAPIDLY  
SPREAD ACROSS THE OHIO VALLEY, REACHING MUCH OF NEW ENGLAND EARLY  
ON SUNDAY. THE STORM IS EXPECTED TO BECOME QUITE INTENSE ON  
SUNDAY OVER INTERIOR NEW ENGLAND WHERE CONDITIONS COULD APPROACH  
BLIZZARD CRITERIA. NEAR AND TO THE SOUTH OF THE STORM TRACK, MUCH  
MILDER AIR FROM THE SOUTH WILL KEEP THE PRECIPITATION AS RAIN. IN  
FACT, STRONG TO POSSIBLY SEVERE THUNDERSTORMS ARE FORECAST FOR THE  
DEEP SOUTH FOR SATURDAY FROM THE LOWER MISSISSIPPI VALLEY EASTWARD  
AS A STRONG COLD FRONT APPROACHES.  
 
IN THE WAKE OF THE STORM, AN ARCTIC SURFACE HIGH WILL PLUNGE  
SOUTHWARD FROM CANADA AND RESULT IN FRIGID TEMPERATURES ACROSS THE  
PLAINS AND THE UPPER MIDWEST, WITH TEMPERATURE DEPARTURES ON THE  
ORDER OF 15 TO 25 DEGREES BELOW NORMAL!  
 
KONG  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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