504  
FXUS01 KWBC 180815  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
315 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 THEN THE WESTERN U.S. FOR THE PAST FEW DAYS IS ABOUT TO EXIT  
THE ROCKIES INTO THE CENTRAL PLAINS. THE LOW PRESSURE SYSTEM WILL  
BE RE-ENERGIZED OVER THE PLAINS AS IT MERGES WITH A STRONG SURGE  
OF ARCTIC AIR FROM CANADA. SNOW COMBINED WITH VERY STRONG WINDS  
WILL SPREAD 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 OVERSPREAD THE OHIO  
VALLEY, REACHING MUCH OF NEW ENGLAND EARLY ON SUNDAY. THE STORM  
IS EXPECTED TO BECOME QUITE INTENSE ON SUNDAY AS ITS CENTER PASSES  
NEAR OR JUST SOUTH OF NEW YORK CITY. CONDITIONS OVER INTERIOR NEW  
ENGLAND COULD APPROACH BLIZZARD CRITERIA AS THE STORM BRINGS VERY  
STRONG NORTHERLY WINDS TOGETHER WITH HEAVY SNOW. NEAR AND TO THE  
SOUTH OF THE STORM TRACK, MUCH MILDER AIR FROM THE SOUTH WILL KEEP  
THE PRECIPITATION AS RAIN. OVER THE DEEP SOUTH, STRONG TO  
POSSIBLY SEVERE THUNDERSTORMS ARE FORECAST 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!  
 
MEANWHILE, MOUNTAIN SNOWS ACROSS THE CENTRAL AND SOUTHERN ROCKIES  
ASSOCIATED WITH THE EXITING LOW PRESSURE SYSTEM ARE EXPECTED TO  
GRADUALLY TAPER OFF TODAY. HOWEVER, MORE ENERGETIC LOW PRESSURE  
SYSTEMS AND ASSOCIATED FRONTS ARE FORECAST TO REACH THE PACIFIC  
NORTHWEST, BRINGING HEAVY PRECIPITATION AND GUSTY WINDS ACROSS THE  
REGION ON SATURDAY. THE PRECIPITATION IS EXPECTED TO SHIFT  
FURTHER TO THE SOUTH ACROSS OREGON AND NORTHERN CALIFORNIA  
SATURDAY NIGHT INTO EARLY ON SUNDAY.  
 
KONG  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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