922  
FXUS01 KWBC 170807  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
306 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. 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. SOME THUNDERSTORMS WILL ALSO BE POSSIBE ACROSS THE GULF  
COAST REGION. HEAVY SNOW WILL BEGIN BY FRIDAY EVENING OVER THE  
CENTRAL PLAINS AND THEN PROGRESS EASTWARD BY THE WEEKEND. CONSULT  
THE WPC WINTER WEATHER PRODUCTS AND DISCUSSION FOR MORE  
INFORMATION ON THIS SYSTEM. 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!  
 
HAMRICK/REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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