103  
FXUS01 KWBC 170800  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 AM EST THU JAN 17 2019  
 
VALID 12Z THU JAN 17 2019 - 12Z SAT JAN 19 2019  
 
...MAJOR WINTER STORM CONTINUES ACROSS THE WESTERN U.S. AND THEN  
REACHES THE PLAINS BY FRIDAY...  
 
A SEVERE WINTER STORM HAS BEEN HAMMERING CALIFORNIA WEDNESDAY  
NIGHT, AND VERY HEAVY SNOW IS EXPECTED TO CONTINUE FOR THE SIERRA  
NEVADA AND ALSO THE MOUNTAINS OF NORTHERN CALIFORNIA. BLIZZARD  
WARNINGS ARE IN EFFECT THROUGH THURSDAY MORNING FOR THE HIGHEST  
ELEVATIONS, WITH SNOWFALL AMOUNTS IN EXCESS OF THREE FEET  
EXPECTED! IN ADDITION TO THE HEAVY SNOW, HEAVY RAIN WILL ALSO  
FALL ACROSS THE LOWER ELEVATIONS, WITH MOST OF IT HAPPENING  
THROUGH THURSDAY EVENING. A MODERATE RISK OF RAINFALL HAS BEEN  
ISSUED FOR A SMALL AREA IN SOUTHERN CALIFORNIA, PARTICULARLY WHERE  
THE BURN SCARS EXIST IN THE LOS ANGELES REGION. PRECIPITATION  
WILL BEGIN TO WIND DOWN BY THURSDAY NIGHT AND INTO FRIDAY MORNING  
AS THE FRONTAL SYSTEM PROGRESSES FARTHER INLAND ACROSS THE  
INTERMOUNTAIN WEST.  
 
THE UPPER LEVEL TROUGH RESPONSIBLE FOR THE ONGOING STORM OVER THE  
WESTERN U.S. WILL GENERATE A NEW SURFACE LOW OVER THE WESTERN HIGH  
PLAINS BY FRIDAY MORNING AND THIS WILL BE THE NEXT BIG FEATURE TO  
MONITOR GOING INTO THE UPCOMING WEEKEND. IN THE STORMS WAKE,  
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! FREEZING RAIN, HEAVY SNOW, AND HEAVY RAIN  
ARE EXPECTED IN ASSOCIATION WITH THE STORM SYSTEM THROUGH THE  
CENTRAL AND EASTERN U.S. OVER THE NEXT FEW DAYS. HEAVY SNOW WILL  
BEGIN BY FRIDAY EVENING OVER THE CENTRAL PLAINS AND THEN PROGRESS  
EASTWARD BY THE WEEKEND. SEE WPC'S WINTER WEATHER PRODUCTS AND  
DISCUSSION FOR MORE INFORMATION ON THIS SYSTEM.  
 
HAMRICK/REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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