767  
FXUS01 KWBC 312000  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
400 PM EDT FRI AUG 31 2018  
 
VALID 00Z SAT SEP 01 2018 - 00Z MON SEP 03 2018  
 
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF  
THE UPPER/MIDDLE MISSISSIPPI VALLEY...  
 
...HEAVY RAIN POSSIBLE FOR THE UPPER/MIDDLE MISSISSIPPI VALLEY  
INTO PARTS OF THE CENTRAL PLAINS...  
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE CENTRAL GULF COAST
 
 
A FRONT EXTENDING FROM THE NORTHERN PLAINS/UPPER MISSISSIPPI  
VALLEY TO THE CENTRAL PLAINS WESTWARD TO PARTS OF THE GREAT BASIN  
WILL SLOWLY MOVE EASTWARD TO THE UPPER GREAT LAKES SOUTHWESTWARD  
TO THE CENTRAL PLAINS THEN WESTWARD TO PARTS OF THE GREAT BASIN BY  
SATURDAY AFTERNOON. THE BOUNDARY WILL SLOWLY DISSIPATE BY  
SATURDAY EVENING. SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG  
AND NEAR THE FRONT FROM THE UPPER MISSISSIPPI VALLEY INTO PARTS OF  
THE CENTRAL ROCKIES THAT WILL MOVE EASTWARD TO THE GREAT LAKES  
INTO PARTS OF THE MIDDLE MISSISSIPPI VALLEY AND PARTS OF THE  
CENTRAL/SOUTHERN PLAINS BY SUNDAY. SHOWERS AND THUNDERSTORMS WILL  
CONTINUE ALONG THE OLD BOUNDARY ON SATURDAY AFTERNOON INTO SUNDAY.  
IN ADDITION, TROPICAL MOISTURE AND DAYTIME HEATING WILL AID IN  
PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE LOWER GREAT  
LAKES INTO THE MID-ATLANTIC AND OVER PARTS OF THE OHIO/TENNESSEE  
VALLEYS AS WELL AS THE GULF COAST THROUGH SUNDAY.  
 
MEANWHILE, A SECOND FRONT OVER WESTERN CANADA WILL MOVE  
SOUTHEASTWARD TO THE UPPER MISSISSIPPI VALLEY INTO THE NORTHERN  
PLAIN THEN NORTHWESTWARD ACROSS PARTS OF THE NORTHERN HIGH  
PLAINS/NORTHERN ROCKIES BY SUNDAY. SHOWERS AND THUNDERSTORMS WILL  
DEVELOP ALONG AND NEAR THE BOUNDARY OVERNIGHT SATURDAY THAT WILL  
MOVE EASTWARD TO THE UPPER MISSISSIPPI VALLEY INTO THE NORTHERN  
PLAINS BY SUNDAY. MONSOONAL MOISTURE AND DAYTIME HEATING WILL AID  
IN PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE  
SOUTHWEST/GREAT BASIN AND THE CENTRAL/SOUTHERN ROCKIES OVERNIGHT  
FRIDAY INTO SUNDAY. THE GREATEST AREAL COVERAGE WILL BE DURING  
THE LATE AFTERNOON INTO THE LATE EVENING. ADDITIONALLY,  
UPPER-LEVEL ENERGY OVER THE SOUTHERN ROCKIES WILL MOVER EASTWARD  
INTO THE CENTRAL/SOUTHERN HIGH PLAINS OVERNIGHT SATURDAY INTO  
SUNDAY. THE ENERGY WILL AID IN DEVELOPING SHOWERS AND  
THUNDERSTORMS OVER REGION OVERNIGHT SATURDAY INTO SUNDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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