620  
FXUS01 KWBC 180744  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
343 AM EDT WED JUL 18 2018  
 
VALID 12Z WED JUL 18 2018 - 12Z FRI JUL 20 2018  
 
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF  
THE CENTRAL PLAINS...  
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE UPPER MISSISSIPPI AND THE  
MIDDLE MISSOURI VALLEYS...  
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE SOUTHEAST COAST AND THE  
EASTERN GULF COAST...  
 
A QUASI-STATIONARY FRONT EXTENDING FROM THE SOUTHERN MID-ATLANTIC  
INTO PARTS OF THE SOUTHERN PLAINS WILL SLOWLY DISSIPATE OVER THE  
SOUTHERN PLAINS/LOWER MISSISSIPPI VALLEY BY THURSDAY EVENING,  
WHILE THE BOUNDARY CONTINUES OVER THE SOUTHEAST. SHOWERS AND  
THUNDERSTORMS WILL DEVELOP ALONG AND NEAR THE FRONT FROM THE  
SOUTHERN MID-ATLANTIC COAST TO PARTS OF THE LOWER/MIDDLE  
MISSISSIPPI VALLEY AND PARTS OF THE SOUTHERN PLAINS THAT WILL END  
OVER THE LOWER/MIDDLE MISSISSIPPI VALLEY AND SOUTHERN PLAINS  
OVERNIGHT WEDNESDAY. SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER  
PARTS OF THE SOUTHERN MID-ATLANTIC/SOUTHEAST WESTWARD TO THE  
TENNESSEE VALLEY THROUGH THURSDAY EVENING.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER NORTHERN PLAINS WILL MOVE  
EASTWARD TO THE UPPER MISSISSIPPI VALLEY BY THURSDAY EVENING. THE  
ENERGY WILL TRIGGER SHOWERS AND THUNDERSTORMS OVER PARTS OF THE  
NORTHERN/CENTRAL HIGH PLAINS AND THE NORTHERN PLAINS THAT WILL  
MOVE INTO PARTS OF THE NORTHERN/CENTRAL PLAINS BY WEDNESDAY  
EVENING. THE SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE  
EASTWARD INTO THE UPPER/MIDDLE MISSISSIPPI VALLEY BY THURSDAY  
EVENING. ADDITIONAL UPPER-LEVEL ENERGY WILL AID IN PRODUCING  
SHOWERS AND THUNDERSTORMS OVER PARTS OF THE CENTRAL PLAINS  
THURSDAY AFTERNOON INTO EVENING. IN ADDITION, MONSOONAL MOISTURE  
AND DAYTIME HEATING WILL AID IN DEVELOPING SHOWERS AND  
THUNDERSTORMS OVER PARTS OF THE SOUTHWEST/GREAT BASIN AND  
CENTRAL/SOUTHERN ROCKIES THROUGH THURSDAY EVENING. THE GREATEST  
AREAL COVERAGE OF THE SHOWERS AND THUNDERSTORMS WILL BE DURING THE  
LATE AFTERNOON INTO THE LATE EVENING ON WEDNESDAY AND THURSDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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