124  
FXUS01 KWBC 031946  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
245 PM EST SUN DEC 03 2017  
 
VALID 00Z MON DEC 04 2017 - 00Z WED DEC 06 2017  
 
...POSSIBLE BLIZZARD CONDITIONS FOR THE EASTERN DAKOTAS INTO  
NORTHERN MINNESOTA MONDAY/MONDAY NIGHT..  
 
...EXTREME FIRE DANGER FOR PORTIONS OF SOUTHERN CALIFORNIA  
DEVELOPING MONDAY...  
   
..BIG COOL DOWN COMING FROM WEST TO EAST ON MONDAY AND TUESDAY
 
 
THE STORM SYSTEM THAT WILL BE RESPONSIBLE FOR MOST OF THE ACTIVE  
WEATHER ACROSS THE LOWER 48 IS CURRENTLY LOCATED OVER THE  
NORTHWESTERN U.S. IN THE FORM OF AN UPPER LEVEL TROUGH. AT THE  
SURFACE, A STRONG COLD FRONT MOVING THROUGH THE GREAT BASIN SUNDAY  
AFTERNOON WITH A MIXTURE OF RAIN AND SNOW FALLING OVER PORTIONS OF  
THE NORTHERN ROCKY MOUNTAINS, SOUTHWARD INTO THE GREAT BASIN.  
 
AS THE STORM SYSTEM REACHES THE PLAINS TONIGHT, A SURFACE LOW WILL  
BEGIN TO STRENGTHEN AS IT TRACKS TOWARD THE UPPER MISSISSIPPI  
VALLEY. HEAVY SNOW IS EXPECTED TONIGHT FOR THE MOUNTAINS OF  
WYOMING WITH SNOW DEVELOPING NORTHWEST OF THE SURFACE LOW TRACK  
INTO THE DAKOTAS THROUGH LATE MONDAY MORNING. WINDS WILL INCREASE  
AS THE LOW BECOMES BETTER ORGANIZED WITH GUSTS OF 30 TO 50 MPH  
EXPECTED FROM THE EASTERN DAKOTAS INTO PARTS OF MINNESOTA LATE  
MONDAY INTO MONDAY NIGHT. THESE WINDS WHEN COMBINED WITH FALLING  
SNOW MAY GENERATE BLIZZARD CONDITIONS WITH IMPACTS TO TRAVEL  
LIKELY FROM THE EASTERN DAKOTAS INTO NORTHERN MINNESOTA. SNOWFALL  
ACCUMULATIONS OF 2 TO 4 INCHES INCHES ARE EXPECTED ACROSS THE  
REGION WITH INCREASING AMOUNTS INTO NORTHERN MINNESOTA WHERE 6 TO  
12 INCHES ARE FORECAST BEFORE SNOW COMES TO AN END TUESDAY MORNING.  
 
AS COLD AIR RUSHES IN BEHIND THIS STORM SYSTEM'S COLD FRONT, THE  
COMBINATION OF GUSTY STRONG WINDS AND LOW RELATIVE HUMIDITIES IS  
EXPECTED TO POSE AN ENVIRONMENT HIGHLY FAVORABLE FOR THE  
DEVELOPMENT OF WILDFIRES ACROSS PORTIONS OF SOUTHERN CALIFORNIA ON  
MONDAY. THIS TREAT WILL BE GREATEST FROM NEAR POINT CONCEPTION TO  
SAN DIEGO.  
 
SCATTERED RAIN SHOWERS AND THUNDERSTORMS ARE EXPECTED OUT AHEAD OF  
THE LOW CENTER FROM THE UPPER GREAT LAKES REGION DOWN INTO THE  
MIDDLE MISSISSIPPI VALLEY, WITH A NARROW LINE OF  
SHOWERS/THUNDERSTORMS LIKELY DEVELOPING JUST AHEAD OF THE COLD  
FRONT ACROSS THE SOUTH LATER ON MONDAY INTO MONDAY NIGHT.  
 
HIGH TEMPERATURES ON TUESDAY FROM THE GREAT LAKES TO TEXAS WILL  
DROP 20-30 DEGREES COMPARED TO A RELATIVELY BALMY MONDAY ACROSS  
THESE REGIONS. THE COLD FRONT WILL BE LESS INTENSE AS IT REACHES  
THE EAST COAT, BUT A LARGE DROP IN TEMPERATURES IS STILL EXPECTED  
COMPARED TO FORECAST HIGHS ON MONDAY.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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