647  
FXUS01 KWBC 240808  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
307 AM EST SAT NOV 24 2018  
 
VALID 12Z SAT NOV 24 2018 - 12Z MON NOV 26 2018  
 
...WINTER STORM WILL BRING HEAVY SNOW AND STRONG WINDS FROM THE  
CENTRAL PLAINS INTO THE GREAT LAKES BEGINNING SATURDAY NIGHT...  
 
...HEAVY SNOWFALL LIKELY IN THE HIGHER TERRAIN OF THE  
INTERMOUNTAIN WEST AND THE ROCKIES...  
 
...HEAVY RAINFALL WILL IMPACT THE MID-ATLANTIC TO THE NORTHEAST ON  
SATURDAY, WITH LIGHT ICE ACCUMULATIONS POSSIBLE IN THE  
APPALACHIANS...  
 
ON SATURDAY NIGHT AND INTO SUNDAY MORNING, A CLOSED UPPER LEVEL  
LOW WILL SWING ACROSS THE PLAINS AND INTO THE MISSISSIPPI VALLEY.  
AT THE SURFACE, A SURFACE LOW WILL TRACK FROM THE ROCKIES, MOVES  
ACROSS THE PLAINS ON SATURDAY EVENING AND ENTERS THE MIDDLE  
MISSISSIPPI VALLEY BY SUNDAY MORNING. THIS WILL LEAD TO A WINTER  
STORM LIKELY TO DEVELOP SATURDAY NIGHT AND QUICKLY STRENGTHEN BY  
SUNDAY OVER THE CENTRAL U.S. SIGNIFICANT SNOWFALL IS POSSIBLE FROM  
THE CENTRAL PLAINS TO THE MISSOURI RIVER VALLEY ON SATURDAY NIGHT  
AND INTO SUNDAY MORNING. BY SUNDAY AND INTO MONDAY, THE  
SIGNIFICANT SNOWFALL WILL SHIFT TO THE GREAT LAKES. THE  
COMBINATION OF HEAVY SNOW AND STRONG WINDS MAY PRODUCE BLIZZARD  
CONDITIONS ESPECIALLY IN THE HARDEST-HIT AREAS. FURTHERMORE,  
DANGEROUS TRAVEL CONDITIONS CAUSED BY HEAVY SNOW AND REDUCED  
VISIBILITY ARE EXPECTED TO END THE HOLIDAY WEEKEND.  
 
THE UPPER LEVEL SYSTEM THAT WILL BRING HEAVY SNOW TO THE CENTRAL  
U.S. IS CURRENTLY CAUSING THE HEAVY RAIN AND HIGHER ELEVATION SNOW  
ACROSS THE WEST COAST. AS THAT UPPER LEVEL SYSTEM MOVES FARTHER  
EASTWARD, THE PRECIPITATION WILL COME TO AN END FOR CALIFORNIA AND  
THE PACIFIC NORTHWEST--SHIFTING TOWARD THE INTERMOUNTAIN WEST  
TODAY. EXPECT HEAVY SNOW ACROSS PARTS OF THE NORTHERN AND CENTRAL  
ROCKIES TODAY. WINTER STORM WARNINGS AND WINTER WEATHER ADVISORIES  
ARE IN EFFECT ACROSS THESE REGIONS. AS THE WINTER STORM DEVELOPS  
ACROSS THE PLAINS, THE SNOW WILL COME TO AN END FOR THE ROCKIES  
LATE TONIGHT AND INTO EARLY SUNDAY MORNING.  
 
SHOWERS WILL BEGIN TO SPREAD ACROSS THE MID-ATLANTIC AND NORTHEAST  
TODAY, COMING TO AN END FOR THE TENNESSEE VALLEY AND SOUTHEAST. AS  
PRECIPITATION INCREASES THIS MORNING, THERE WILL BE A CHANCE OF  
LIGHT FREEZING RAIN ACCUMULATIONS ACROSS THE CENTRAL APPALACHIANS  
NORTHWARD INTO THE NORTHEAST. A SURFACE LOW WILL DEVELOP IN THE  
CAROLINAS THIS AFTERNOON AND TRACK NORTHWARD ACROSS THE  
MID-ATLANTIC THIS EVENING AND HUG THE NEW ENGLAND COAST ON SUNDAY  
MORNING--BRINGING HEAVY RAINFALL WITH IT. A MARGINAL RISK OF  
EXCESSIVE RAINFALL IS POSSIBLE FOR THESE AREAS THROUGH SUNDAY  
MORNING. THE NEXT ROUND OF SHOWERS WILL ENTER THE NORTHEAST,  
MID-ATLANTIC AND SOUTHEAST ON MONDAY MORNING WITH ANOTHER INCOMING  
FRONTAL SYSTEM.  
 
THE CENTRAL U.S. WILL EXPERIENCE ABOVE AVERAGE TEMPERATURES TODAY  
AHEAD OF THE IMPENDING WINTER STORM. BY SUNDAY, AS THE STRONG COLD  
FRONT SWEEPS ACROSS THIS AREA, HIGH TEMPERATURES WILL BE 10 TO 20  
DEGREES BELOW NORMAL. FOR THE EASTERN U.S., EXPECT HIGH  
TEMPERATURES TO BE BELOW AVERAGE TODAY BUT WILL BE A SIGNIFICANT  
WARM UP FROM THE LAST FEW DAYS. BY SUNDAY, TEMPERATURES WILL BE  
NEAR AVERAGE. THE WESTERN U.S. WILL BE NEAR TO SLIGHTLY ABOVE  
AVERAGE FOR THE WEEKEND.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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