290  
FXUS01 KWBC 251954  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
253 PM EST TUE DEC 25 2018  
 
VALID 00Z WED DEC 26 2018 - 00Z FRI DEC 28 2018  
 
...SIGNIFICANT POST-CHRISTMAS WINTER STORM IS EXPECTED FROM THE  
CENTRAL PLAINS TO THE UPPER GREAT LAKES...  
 
...SEVERE WEATHER, HEAVY RAIN AND FLASH FLOODING WILL BE POSSIBLE  
ACROSS PORTIONS OF THE SOUTHERN PLAINS AND LOWER MISSISSIPPI  
VALLEY...  
   
..SOME LOCALLY HEAVY SNOW IS EXPECTED FOR THE ROCKIES
 
 
A STORM SYSTEM CURRENTLY MOVING INTO THE SOUTHWEST U.S. WILL  
ADVANCE GRADUALLY EAST TONIGHT THROUGH WEDNESDAY BRINGING LOCALLY  
HEAVY SNOW ACROSS PORTIONS OF THE INTERMOUNTAIN WEST AND ALSO THE  
ROCKIES. A COLD FRONT ASSOCIATED WITH THE STORM SYSTEM WILL BE  
CROSSING THE FOUR CORNERS REGION, AND THE TREND OVER THE NEXT  
COUPLE OF DAYS WILL BE TOWARD NOTABLY COLDER TEMPERATURES ACROSS  
MUCH OF THE WEST WITH HIGH TEMPERATURES AS MUCH AS 10 TO 15  
DEGREES BELOW NORMAL BY THURSDAY.  
 
THIS SAME STORM SYSTEM THOUGH IMPACTING THE SOUTHWEST IS EXPECTED  
TO EJECT OUT ACROSS THE SOUTHERN HIGH PLAINS BY WEDNESDAY NIGHT  
BEFORE THEN LIFT NORTHEAST TOWARD THE UPPER MIDWEST BY THURSDAY  
EVENING. A SIGNIFICANT POST-CHRISTMAS WINTER STORM IS EXPECTED AS  
A RESULT WITH HEAVY SNOW AND STRONG WINDS EXPECTED FROM THE  
CENTRAL PLAINS NORTHEAST TO THE UPPER GREAT LAKES REGION. THIS  
WILL RESULT IN HAZARDOUS TRAVEL CONDITIONS OVER A WIDESPREAD AREA  
WITH SIGNIFICANT IMPACTS TO ROAD AND AIR TRAVEL. SNOWFALL AMOUNTS  
ARE LIKELY TO EXCEED 1 FOOT FROM AREAS OF NORTHERN NEBRASKA  
THROUGH CENTRAL AND EASTERN SOUTH DAKOTA BY THURSDAY EVENING.  
 
MEANWHILE, THE SAME STORM SYSTEM WILL BRING A THREAT OF SEVERE  
WEATHER, AND ALSO HEAVY RAIN AND POSSIBLE FLASH FLOODING FOR  
PORTIONS OF THE SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY FROM  
WEDNESDAY AFTERNOON THROUGH THURSDAY AS WIDESPREAD SHOWERS AND  
THUNDERSTORMS DEVELOP ALONG AND AHEAD OF A COLD FRONT. IN FACT,  
THE STORM PREDICTION CENTER HAS HIGHLIGHTED A SLIGHT RISK OF  
SEVERE WEATHER ACROSS THESE AREAS FOR THE POTENTIAL OF DAMAGING  
WINDS, LARGE HAIL AND EVEN SOME TORNADOES. HEAVY RAINFALL OF AS  
MUCH AS 2 TO 4 INCHES CAN BE EXPECTED WITH LOCALLY HEAVIER  
AMOUNTS, AND THIS WILL RESULT IN SOME CONCERNS FOR FLASH FLOODING  
AS WELL FOR THE SAME AREAS SEEING THE THREAT OF SEVERE  
THUNDERSTORMS. THE WEATHER PREDICTION CENTER HAS HIGHLIGHTED A  
SLIGHT RISK TO ADDRESS THE EXCESSIVE RAINFALL THREAT.  
 
COLDER AIR OVER THE WEST WILL EJECT EAST OUT ACROSS THE PLAINS IN  
BEHIND THIS STORM SYSTEM, BUT THE TEMPERATURES OUT AHEAD OF THE  
ADVANCING LOW CENTER WILL BE MUCH ABOVE NORMAL. THIS WILL INCLUDE  
HIGH TEMPERATURES ACROSS MUCH OF THE MIDWEST RISING TO AS MUCH AS  
15 TO 25 DEGREES ABOVE NORMAL BY THURSDAY. THE REMAINDER OF THE  
COUNTRY SHOULD BE RATHER QUIET AND DRY AT LEAST THROUGH THURSDAY,  
BUT EXPECT THE AFOREMENTIONED STORM SYSTEM TO MOVE INTO THE  
EASTERN U.S. BY THE END OF THE WEEK.  
 
ORRISON  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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