071  
FXUS01 KWBC 050800  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 AM EST WED DEC 05 2018  
 
VALID 12Z WED DEC 05 2018 - 12Z FRI DEC 07 2018  
 
...STORM SYSTEM TO BRING RAIN AND MOUNTAIN SNOW TO CALIFORNIA  
WEDNESDAY INTO THURSDAY...  
 
...A SURGE OF COLD AIR ENTERS THE CENTRAL U.S. ON THURSDAY, WITH  
FREEZING RAIN OR SNOW BEGINNING BY EARLY FRIDAY IN THE OKLAHOMA  
AND TEXAS PANHANDLE...  
 
PRECIPITATION IN CALIFORNIA WILL CONTINUE THE NEXT FEW DAYS AS A  
SLOW MOVING UPPER LEVEL SYSTEM DROPS SOUTHWARD ALONG THE WEST  
COAST. LOCALLY HEAVY RAINFALL IS POSSIBLE ACROSS PARTS OF CENTRAL  
AND SOUTHERN CALIFORNIA WITH FLASH FLOODING AND DEBRIS FLOW A  
CONCERN, PARTICULARLY OVER SENSITIVE BURN SCAR AREAS. SNOW IN THE  
HIGHER ELEVATIONS OF THE SIERRA NEVADA RANGE IS ALSO EXPECTED, BUT  
ACCUMULATIONS SHOULD BE FAIRLY LIGHT. THIS SAME SYSTEM WILL SPREAD  
LOW ELEVATION RAIN AND HIGH ELEVATION SNOW SHOWERS INTO THE  
SOUTHWEST AND SOUTHERN GREAT BASIN ON THURSDAY AS WELL.  
 
ELSEWHERE ACROSS THE COUNTRY, SPRAWLING SURFACE HIGH PRESSURE  
DOMINATES RESULTING IN A RELATIVELY QUIET WEATHER PATTERN FOR MUCH  
OF THE SHORT RANGE PERIOD. TEMPERATURES ACROSS THE EASTERN THIRD  
OF THE COUNTRY, AS WELL AS THE NORTHERN ROCKIES WILL BE 10 TO 15  
DEGREES BELOW EARLY DECEMBER NORMALS ON WEDNESDAY, WITH A  
REINFORCING SHOT OF COLD AIR ENTERING THE NORTHERN TIER STATES BY  
THURSDAY AS WELL. AFTERNOON HIGHS ON THURSDAY MAY BE 10 TO 20  
DEGREES BELOW AVERAGE ACROSS THE NORTHERN AND CENTRAL PLAINS AND  
INTO THE UPPER MISSISSIPPI VALLEY IN THE WAKE OF A COLD FRONT  
STRETCHING FROM THE GREAT LAKES TO TEXAS. LIGHT SNOW FOR NORTHERN  
LOCATIONS AND LIGHT RAIN FOR SOUTHERN LOCATIONS WILL ACCOMPANY  
THIS FRONT AS IT WORKS SOUTH AND EAST ON THURSDAY, WITH  
PRECIPITATION INCREASING IN INTENSITY BY EARLY FRIDAY ACROSS THE  
SOUTHERN PLAINS AS THE UPPER LEVEL SYSTEM IN CALIFORNIA PUSHES  
EASTWARD AND BRINGS A SURGE OF MOISTURE INTO THE REGION. SNOW OR  
FREEZING RAIN MAY BE POSSIBLE AS FAR SOUTH AS THE TEXAS PANHANDLE.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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