364  
FXUS01 KWBC 010735  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
234 AM EST SAT DEC 1 2018  
 
VALID 12Z SAT DEC 1 2018 - 12Z MON DEC 3 2018  
 
...MULTI-FACETED STORM SYSTEM OVER THE CENTRAL-EASTERN U.S. IS  
EXPECTED TO RESULT IN SEVERE THUNDERSTORMS, HEAVY RAIN, AND  
BLIZZARD CONDITIONS...  
 
AN ACTIVE WEATHER PATTERN WILL BE IN PLACE ACROSS THE CENTRAL U.S.  
THIS WEEKEND AS A STRONG SURFACE LOW TRACKS FROM KANSAS TO THE  
GREAT LAKES REGION. WIDESPREAD SHOWERS AND THUNDERSTORMS ARE  
EXPECTED FROM THE MIDDLE MISSISSIPPI RIVER VALLEY TO THE EAST  
COAST. IN THE WARM SECTOR OF THE DEVELOPING SURFACE LOW, SEVERE  
WEATHER WILL BE POSSIBLE FROM SOUTHERN LOUISIANA TO THE OHIO  
VALLEY. THE STORM PREDICTION CENTER CURRENTLY HAS MUCH OF THAT  
REGION DELINEATED IN A SLIGHT RISK AREA FOR SEVERE THUNDERSTORMS,  
GIVEN THE PRESENCE OF FAVORABLE WIND SHEAR AND THERMODYNAMIC  
PARAMETERS. THERE WILL ALSO BE THE POTENTIAL FOR SOME HEAVY RAIN  
AND PERHAPS SOME LOCALIZED FLOODING ACROSS PARTS OF THE GULF COAST  
REGION, WHERE 1 TO 3 INCHES OF RAIN WILL BE POSSIBLE.  
 
WINTER WEATHER WILL ALSO BE A MAJOR COMPONENT OF THIS MID-LATITUDE  
CYCLONE TO THE NORTH AND WEST OF THE OCCLUDED SURFACE LOW. WINTER  
STORM WARNINGS ARE CURRENTLY IN EFFECT FROM EASTERN MONTANA TO  
NORTHERN IOWA, WITH THE POTENTIAL FOR 8 INCHES OR MORE OF SNOW,  
ESPECIALLY ACROSS SOUTHERN SOUTH DAKOTA AND NORTHERN NEBRASKA.  
BLIZZARD CONDITIONS WILL ALSO BE POSSIBLE AT TIMES GIVEN THE  
STRONG PRESSURE GRADIENT THAT IS ANTICIPATED NORTH OF THE SURFACE  
LOW, MAKING TRAVEL CONDITIONS HAZARDOUS ALONG WITH POSSIBLE POWER  
OUTAGES.  
 
TEMPERATURES ARE EXPECTED TO BE QUITE MILD AHEAD OF THE COLD FRONT  
FROM THE SOUTHERN PLAINS TO THE MID-ATLANTIC AND POINTS SOUTH  
THROUGH EARLY SUNDAY. AFTERNOON HIGHS COULD BE AS MUCH AS 15 TO  
20 DEGREES ABOVE NORMAL SOUTH OF THE WARM FRONT, WITH READINGS  
WELL INTO THE 70S AND REACHING THE MID 80S ACROSS MUCH OF FLORIDA.  
MUCH COLDER WEATHER WILL BECOME ESTABLISHED OVER MUCH OF THE  
INTERMOUNTAIN WEST AND THEN THE NORTHERN PLAINS BY THE BEGINNING  
OF THE WORK WEEK ON MONDAY.  
 
D. HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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