743  
FXUS01 KWBC 080800  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 AM EST FRI DEC 08 2017  
 
VALID 12Z FRI DEC 08 2017 - 12Z SUN DEC 10 2017  
 
...ACCUMULATING SNOWFALL LIKELY FROM SOUTHERN MISSISSIPPI INTO THE  
SOUTHERN APPALACHIANS, MID-ATLANTIC AND NORTHEAST...  
 
...LOCALLY HEAVY LAKE EFFECT SNOWFALL TO CONTINUE TONIGHT DOWNWIND  
OF THE GREAT LAKES...  
 
...CRITICAL TO EXTREME FIRE WEATHER CONDITIONS EXPECTED TO PERSIST  
ACROSS PORTIONS OF SOUTHERN CALIFORNIA...  
 
THE UPPER LEVEL PATTERN WILL KEEP LOCATIONS FROM THE SOUTH-CENTRAL  
TO SOUTHEASTERN U.S. MUCH COLDER THAN EARLY DECEMBER MAXIMUM  
TEMPERATURES TODAY INTO SATURDAY. TEMPERATURES WILL BE ROUGHLY 10  
TO 20 DEGREES BELOW AVERAGE FROM CENTRAL AND SOUTHERN TEXAS INTO  
THE CAROLINAS TODAY, LOCATED NORTH OF A STRONG FRONTAL BOUNDARY  
CURRENTLY STRETCHING THROUGH THE WESTERN ATLANTIC, THROUGH FLORIDA  
AND INTO THE GULF OF MEXICO.  
 
EARLY FRIDAY MORNING, A BROAD SWATH OF PRECIPITATION WAS LOCATED  
NORTH OF THE STRONG FRONT FROM SOUTH TEXAS TO THE CENTRAL GULF  
COAST AND THE CAROLINAS. MUCH OF THIS PRECIPITATION WAS FALLING AS  
A COLD RAIN, BUT RARE ACCUMULATING SNOW WAS OCCURRING OVER  
PORTIONS OF SOUTHERN AND SOUTHEASTERN TEXAS. AS COLD AIR CONTINUES  
TO FILTER INTO THE NORTHERN EDGES OF THE PRECIPITATION ZONE, A  
CHANGEOVER TO SNOW IS EXPECTED FOR PORTIONS OF THE DEEP SOUTH WITH  
ONE TO TWO INCHES POSSIBLE FROM SOUTHERN MISSISSIPPI INTO NORTHERN  
GEORGIA INTO FRIDAY NIGHT. AS LOW PRESSURE ORGANIZES OFF OF THE  
SOUTHEASTERN U.S., ACCUMULATING SNOW IS ALSO EXPECTED INTO THE  
SOUTHERN AND CENTRAL APPALACHIANS AS WELL AS THE MID-ATLANTIC AND  
INTO THE NORTHEAST. SOME OF THE HEAVIER ACCUMULATIONS OF 3-6  
INCHES ARE EXPECTED IN THE HIGHER TERRAIN OF THE SOUTHERN  
APPALACHIANS AND ACROSS NEW ENGLAND AS THE SURFACE LOW STRENGTHENS  
LATE SATURDAY.  
 
A SERIES OF UPPER LEVEL IMPULSES, EACH TIED TO A RESURGENCE OF  
COLDER AIR, WILL KEEP PERIODIC LAKE EFFECT SNOW SHOWERS IN THE  
FORECAST FOR THE GREAT LAKES REGION THROUGH THE WEEKEND. THE  
HEAVIEST SNOWFALL ACCUMULATIONS ARE EXPECTED ACROSS THE U.P. OF  
MICHIGAN AND ALONG THE EASTERN SHORE OF LAKE MICHIGAN THROUGH THE  
WEEKEND.  
 
OUT WEST, LITTLE CHANGE IN THE UPPER LEVEL PATTERN WILL KEEP A  
STRONG RIDGE OF HIGH PRESSURE ANCHORED OVER THE GREAT BASIN INTO  
EARLY NEXT WEEK. THE RESULT WILL BE CONTINUED GUSTY WINDS AND VERY  
DANGEROUS FIRE WEATHER CONDITIONS ACROSS SOUTHERN CALIFORNIA WHERE  
A COMBINATION OF RED FLAG WARNINGS AND HIGH WIND WARNINGS IS IN  
EFFECT. ELEVATED TO CRITICAL FIRE WEATHER CONCERNS WILL ALSO SET  
UP ACROSS THE SOUTHERN TO CENTRAL HIGH PLAINS TODAY WITH GUSTY  
WINDS AND LOW RELATIVE HUMIDITIES. PLEASE MONITOR PRODUCTS ISSUED  
BY THE LOCAL WEATHER FORECAST OFFICES ACROSS THESE AREAS FOR  
ADDITIONAL INFORMATION.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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