570  
FXUS01 KWBC 270728  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
227 AM EST THU DEC 27 2018  
 
VALID 12Z THU DEC 27 2018 - 12Z SAT DEC 29 2018  
 
...SIGNIFICANT WINTER STORM WILL IMPACT THE CENTRAL/NORTHERN  
PLAINS AND THE UPPER MIDWEST THROUGH THE END OF THE WEEK...  
 
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF  
THE LOWER MISSISSIPPI VALLEY...  
 
...HEAVY RAIN POSSIBLE FROM PARTS OF THE LOWER MISSISSIPPI VALLEY  
INTO THE MID-ATLANTIC...  
 
A STRONG STORM OVER THE CENTRAL PLAINS WILL MOVE NORTHEASTWARD  
INTO QUEBEC BY FRIDAY EVENING. THE STORM WILL SPREAD HEAVY SNOW  
AND GUSTY WINDS TO MUCH OF THE CENTRAL/NORTHERN PLAINS AND UPPER  
MIDWEST. TRAVEL WILL BE HAZARDOUS WITH SLICK SNOW-COVERED ROADS,  
ESPECIALLY IN PARTS OF THE DAKOTAS WHERE BLIZZARD WARNINGS ARE IN  
EFFECT. SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND AHEAD OF  
THE ASSOCIATED FRONT OVER THE WESTERN GULF COAST INTO THE LOWER  
MISSISSIPPI VALLEY THAT WILL MOVE EASTWARD TO THE  
MID-ATLANTIC/SOUTHEAST BY FRIDAY EVENING. RAIN WILL DEVELOP FROM  
PARTS OF THE CENTRAL/SOUTHERN PLAINS INTO THE MIDDLE MISSISSIPPI  
VALLEY AND THE WESTERN OHIO VALLEY INTO PARTS OF THE TENNESSEE  
VALLEY THAT WILL MOVE INTO THE GREAT LAKES ON THURSDAY. BY FRIDAY  
MORNING, RAIN WILL MOVE INTO PARTS OF THE NORTHEAST/MID-ATLANTIC  
CONTINUING INTO SATURDAY. SNOW, HEAVY AT TIMES, WILL DEVELOP OVER  
PARTS OF THE SOUTHERN HIGH PLAINS INTO NORTHERN/CENTRAL PLAINS  
INTO THE UPPER MISSISSIPPI VALLEY/UPPER GREAT LAKES ON THURSDAY.  
THE SNOW WILL END OVER THE SOUTHERN PLAINS BY THURSDAY EVENING AND  
OVER THE NORTHERN/CENTRAL PLAINS BY FRIDAY EVENING. OVERNIGHT  
THURSDAY, SNOW WILL START OVER PARTS OF NORTHERN NEW ENGLAND  
ENDING BY FRIDAY EVENING. IN ADDITION, POCKETS OF RAIN/FREEZING  
RAIN WILL DEVELOP OVER PARTS OF THE UPPER MISSISSIPPI VALLEY/UPPER  
GREAT LAKES ON THURSDAY ENDING BY THURSDAY EVENING. POCKETS OF  
RAIN/FREEZING RAIN WILL ALSO DEVELOP OVER PARTS OF THE NORTHEAST  
OVERNIGHT THURSDAY INTO FRIDAY EVENING.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER THE PACIFIC NORTHWEST WILL MOVE  
SOUTHWARD TO THE GREAT BASIN/SOUTHWEST WHILE FORMING AN  
UPPER-LEVEL LOW BY FRIDAY MORNING. THE ENERGY WILL SETTLE OVER  
THE CENTRAL/SOUTHERN ROCKIES BY FRIDAY EVENING INTO SATURDAY. THE  
STORM WILL PRODUCE COASTAL RAIN AND HIGHER ELEVATION SNOW OVER  
PARTS OF THE PACIFIC NORTHWEST WITH SNOW EXTENDING INTO THE  
NORTHERN ROCKIES/GREAT BASIN. THE RAIN WILL END OVER THE  
NORTHWEST COAST BY THURSDAY EVENING. THE SNOW WILL MOVE  
SOUTHEASTWARD INTO PARTS OF THE CENTRAL ROCKIES AND SOUTHWEST BY  
THURSDAY EVENING. THE SNOW WILL END OVER THE NORTHERN ROCKIES  
OVERNIGHT THURSDAY WHILE EXPANDING INTO SOUTHERN ROCKIES WITH RAIN  
OVER THE LOWER ELEVATIONS OF THE SOUTHWEST. THE SNOW WILL TAPER  
OFF OVER MOST OF THE GREAT BASIN ON FRIDAY. FURTHERMORE ON  
FRIDAY, ONSHORE FLOW WILL AID IN PRODUCING RAIN AND HIGHER  
ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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