770  
FXUS01 KWBC 131959  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
258 PM EST THU DEC 13 2018  
 
VALID 00Z FRI DEC 14 2018 - 00Z SUN DEC 16 2018  
 
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF  
NORTHEASTERN TEXAS...  
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE EASTERN GULF COAST TO  
PARTS OF THE MID-ATLANTIC AND PARTS OF MIDDLE MISSISSIPPI  
VALLEY/WESTERN OHIO VALLEY INTO PARTS OF THE SOUTHERN PLAINS...  
 
...HEAVY SNOW POSSIBLE OVER PARTS OF THE OLYMPIC PENINSULA AND THE  
NORTHERN CASCADES...  
 
...SLIGHT RISK OF EXCESSIVE RAINFALL OVER PARTS OF THE  
MID-ATLANTIC AND SOUTHEAST...  
 
A STORM OVER THE SOUTHERN PLAINS/LOWER MISSISSIPPI VALLEY WILL  
MOVE NORTHEASTWARD TO THE OHIO VALLEY/MID-ATLANTIC BY SATURDAY.  
THE SYSTEM WILL PRODUCE SHOWERS AND THUNDERSTORMS OVER PARTS OF  
THE SOUTHERN PLAINS/LOWER MISSISSIPPI VALLEY THAT WILL MOVE  
EASTWARD OFF THE SOUTHEAST COAST BY SATURDAY. LIGHT SNOW WILL  
DEVELOP OVER PARTS OF CENTRAL TEXAS ENDING BY FRIDAY MORNING. IN  
ADDITION, RAIN WILL DEVELOP OVER PARTS OF THE SOUTHERN PLAINS INTO  
THE OHIO VALLEY INTO THE LOWER MISSISSIPPI VALLEY THAT WILL MOVE  
EASTWARD TO THE MID-ATLANTIC/SOUTHEAST BY FRIDAY AFTERNOON. THE  
RAIN WILL ALSO EXPAND INTO THE GREAT LAKES OVERNIGHT THURSDAY  
MOVING INTO THE NORTHEAST BY FRIDAY EVENING, ENDING OVER NORTHERN  
NEW ENGLAND BY SATURDAY MORNING. THE RAIN WILL END OVERNIGHT  
FRIDAY OVER THE SOUTHERN PLAINS AND THE LOWER MISSISSIPPI VALLEY  
ON SATURDAY MORNING.  
 
MEANWHILE, A FRONT OVER THE EASTERN PACIFIC MOVES ONSHORE OVER THE  
WEST COAST ON FRIDAY AFTERNOON MOVING INLAND TO THE NORTHERN HIGH  
PLAINS/NORTHERN ROCKIES INTO PARTS OF THE GREAT BASIN BY SATURDAY.  
MOISTURE AHEAD OF THE BOUNDARY WILL AID IN PRODUCING RAIN OVER  
PARTS OF THE PACIFIC NORTHWEST AND SNOW OVER PARTS OF THE NORTHERN  
INTERMOUNTAIN REGION THAT WILL WANE OVER THE NORTHERN  
INTERMOUNTAIN REGION BY FRIDAY MORNING. BY FRIDAY AFTERNOON, RAIN  
WILL DEVELOP OVER PARTS OF THE PACIFIC NORTHWEST COAST INTO  
NORTHERN CALIFORNIA COAST THAT WILL EXPAND INLAND BY FRIDAY  
EVENING WITH RAIN AND HIGHER ELEVATION SNOW. SNOW RETURNS TO THE  
NORTHERN INTERMOUNTAIN REGION AND INTO PARTS OF THE NORTHERN  
ROCKIES BY SATURDAY MORNING. THE RAIN AND SNOW WILL WANE ON  
SATURDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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