393  
FXUS01 KWBC 110758  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
357 AM EDT TUE SEP 11 2018  
 
VALID 12Z TUE SEP 11 2018 - 12Z THU SEP 13 2018  
 
...HURRICANE FLORENCE IS CURRENTLY A MAJOR CATEGORY FOUR  
HURRICANE, RESIDENTS IN THE SOUTHEAST AND MID-ATLANTIC SHOULD  
CLOSELY MONITOR THIS EXTREMELY DANGEROUS SYSTEM...  
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE CENTRAL/WESTERN GULF  
COAST...  
 
FLORENCE HAS STRENGTHENED INTO A MAJOR CATEGORY FOUR HURRICANE.  
THE CYCLONE IS FORECAST TO MOVE NORTHWESTERLY TOWARDS THE  
SOUTHEAST/SOUTHERN MID-ATLANTIC COAST BY FRIDAY MORNING. PLEASE  
SEE THE LATEST NATIONAL HURRICANE CENTER ADVISORIES FOR UPDATES TO  
THE FORECAST TRACK AND DETAILS OF ANY WATCHES AND WARNINGS  
ASSOCIATED WITH FLORENCE.  
 
THE NORTHERN END OF A QUASI-STATIONARY FRONT EXTENDING FROM PARTS  
OF THE NORTHEAST ACROSS THE MID-ATLANTIC INTO THE  
SOUTHEAST/WESTERN GULF COAST WILL MOVE OFF THE NORTHEAST COAST BY  
WEDNESDAY MORNING. RAIN OVER PARTS OF NORTHERN NEW ENGLAND WILL  
MOVE INTO SOUTHEASTERN CANADA BY WEDNESDAY MORNING. THE REST OF  
THE BOUNDARY WILL REMAIN STATIONARY FROM THE MID-ATLANTIC TO THE  
WESTERN GULF COAST THROUGH WEDNESDAY EVENING INTO THURSDAY.  
SHOWERS AND THUNDERSTORM WILL DEVELOP ALONG AND NEAR THE FRONT  
FROM PARTS OF THE MID-ATLANTIC/SOUTHEAST INTO THE CENTRAL/WESTERN  
GULF COAST THROUGH WEDNESDAY EVENING INTO THURSDAY. IN ADDITION,  
TROPICAL MOISTURE OVER FLORIDA WILL AID IN PRODUCING SHOWERS AND  
THUNDERSTORMS OVER THE AREA THROUGH WEDNESDAY EVENING.  
 
MEANWHILE, A FRONT EXTENDING FROM PARTS OF THE NORTHERN PLAINS  
INTO PARTS OF THE NORTHERN ROCKIES/INTERMOUNTAIN REGION WILL MOVE  
EASTWARD INTO THE UPPER MISSISSIPPI VALLEY/NORTHERN PLAINS  
SOUTHWARD INTO THE NORTHERN/CENTRAL ROCKIES AND THE GREAT BASIN BY  
WEDNESDAY. SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER PARTS OF  
THE NORTHERN PLAINS THAT WILL EXPAND INTO PARTS OF THE CENTRAL  
HIGH PLAINS WHILE MOVING INTO PARTS OF THE UPPER MISSISSIPPI  
VALLEY OVERNIGHT TUESDAY. THE SHOWERS AND THUNDERSTORMS WILL  
CONTINUE OVER PARTS OF THE UPPER MISSISSIPPI VALLEY INTO THE  
NORTHERN PLAINS THROUGH WEDNESDAY EVENING. ADDITIONALLY, ONSHORE  
FLOW OVER THE PACIFIC NORTHWEST WILL AID IN PRODUCING RAIN AND  
DAYTIME THUNDERSTORMS OVER THE REGION THROUGH WEDNESDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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