125  
FXUS01 KWBC 142016  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
415 PM EDT MON MAY 14 2018  
 
VALID 00Z TUE MAY 15 2018 - 00Z THU MAY 17 2018  
 
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS EXTENDING IN AN  
ARC FROM THE SOUTHERN PLAINS TO THE MIDDLE MISSISSIPPI  
VALLEY/WESTERN OHIO VALLEY TO THE MID-ATLANTIC...  
 
...HEAVY RAIN POSSIBLE ALONG PARTS OF THE EASTERN GULF  
COAST/SOUTHEAST...  
 
A QUASI-STATIONARY FRONT EXTENDING FROM THE SOUTHERN PLAINS TO  
MIDDLE MISSISSIPPI VALLEY/WESTERN OHIO VALLEY TO THE  
NORTHEAST/MID-ATLANTIC WILL BE THE FOCUS FOR SHOWERS AND  
THUNDERSTORMS ALONG AND NEAR THE BOUNDARY THROUGH WEDNESDAY  
EVENING. THE EASTERN PORTION OF A REINFORCING FRONT EXTENDING  
FROM THE NORTHERN TIP OF MAINE ACROSS SOUTHEASTERN CANADA TO  
SOUTH-CENTRAL CANADA WILL MOVE SOUTHEASTWARD INTO THE NORTHEAST  
AND MERGE WITH THE STATIONARY FRONT BY TUESDAY EVENING. THE  
SYSTEM WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS  
OF THE LOWER GREAT LAKES INTO PARTS OF THE NORTHEAST ON TUESDAY  
MORNING INTO TUESDAY EVENING. THE WESTERN PORTION OF THE BOUNDARY  
WILL STRADDLE THE U. S./CANADIAN BORDER FROM THE UPPER GREAT LAKES  
TO THE NORTHERN HIGH PLAINS THROUGH WEDNESDAY.  
 
MEANWHILE, A WEAKENING UPPER-LEVEL LOW OVER THE GREAT BASIN WILL  
AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE GREAT  
BASIN INTO THE NORTHERN/CENTRAL HIGH PLAINS THROUGH WEDNESDAY. A  
SECOND UPPER-LEVEL LOW OVER THE EASTERN PACIFIC WILL MOVE ONSHORE  
OVER CALIFORNIA OVERNIGHT TUESDAY INTO WEDNESDAY. THE ENERGY WILL  
AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER INLAND PARTS OF  
THE PACIFIC NORTHWEST/NORTHERN CALIFORNIA TUESDAY EVENING INTO  
WEDNESDAY.  
 
ANOTHER UPPER-LEVEL LOW OVER THE NORTHEASTERN GULF OF MEXICO WILL  
AID IN STEERING MOISTURE INTO THE SOUTHEAST/MID-ATLANTIC AND THE  
CENTRAL GULF COAST THROUGH WEDNESDAY. THE MOISTURE AND ENERGY  
WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF  
FLORIDA AND THE SOUTHEAST THAT WILL EXPAND INTO THE SOUTHERN  
MID-ATLANTIC AND THE CENTRAL GULF COAST BY TUESDAY AFTERNOON INTO  
WEDNESDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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