974  
FXUS01 KWBC 172000  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
300 PM EST THU JAN 17 2019  
 
VALID 00Z FRI JAN 18 2019 - 00Z SUN JAN 20 2019  
 
...PERIODS OF HEAVY RAIN ALONG WITH ELEVATED FLOODING CONCERNS  
PERSIST FOR PORTIONS OF CALIFORNIA AND OREGON...  
 
...MAJOR WINTER STORM TO IMPACT THE WESTERN AND CENTRAL STATES  
FRIDAY AND INTO THE WEEKEND...  
 
PRECIPITATION CONTINUES TO SPREAD ACROSS THE WEST AS A STRONG  
WINTER STORM SYSTEM TRACKS TOWARD THE ROCKIES. BLIZZARD WARNINGS  
REMAIN IN EFFECT FOR THE HIGHEST ELEVATIONS OF THE NORTHERN  
PORTIONS OF THE SIERRAS WHERE SNOWFALL AMOUNTS IN EXCESS OF THREE  
FEET EXPECTED. WINTER STORM WARNINGS AND WINTER WEATHER ADVISORIES  
ARE ALSO IN EFFECT FOR THE SURROUNDING AREAS, AS WELL AS,  
WASHINGTON, THE GREAT BASIN, THE INTERMOUNTAIN WEST AND THE  
CENTRAL/SOUTHERN ROCKIES. COASTAL AREAS WILL HAVE AN INCREASED  
RISK FOR HEAVY RAINFALL AND FLASH FLOODING-- ESPECIALLY ALONG THE  
STRETCH OF COAST FROM NORTHERN CALIFORNIA TO NORTHWEST OREGON AND  
A SMALL AREA IN SOUTHERN CALIFORNIA, PARTICULARLY WHERE THE BURN  
SCARS EXIST IN THE LOS ANGELES REGION. PRECIPITATION WILL BEGIN  
TO WIND DOWN OVERNIGHT AS THE FRONT TRACKS FURTHER EAST.  
 
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. THIS SYSTEM IS EXPECTED TO PRODUCE A  
VAST AREA OF HEAVY SNOW, HEAVY RAIN WITH POCKETS OF FREEZING RAIN  
TO THE SOUTH-CENTRAL STATES AND MUCH OF THE EAST COAST. SOME  
THUNDERSTORMS WILL ALSO BE POSSIBLE ACROSS THE GULF COAST REGION.  
HEAVY SNOW WILL BEGIN BY FRIDAY EVENING OVER THE CENTRAL PLAINS  
AND THEN PROGRESS EASTWARD BY THE WEEKEND. ADDITIONALLY, SNOW IS  
EXPECTED ACROSS PORTIONS OF THE NORTHERN PLAINS AND UPPER MIDWEST  
AS A COLD FRONT DROPS SOUTH. 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!  
 
CAMPBELL/HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page