857  
FXUS01 KWBC 120738  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
338 AM EDT SUN AUG 12 2018  
 
VALID 12Z SUN AUG 12 2018 - 12Z TUE AUG 14 2018  
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE SOUTHERN PLAINS
 
 
...TEMPERATURES WILL BE 10 TO 20 DEGREES ABOVE AVERAGE OVER PARTS  
OF THE NORTHERN HIGH PLAINS...  
 
A QUASI-STATIONARY FRONT EXTENDING FROM THE MID-ATLANTIC INTO THE  
SOUTHEAST AND ALONG THE GULF COAST WILL AID IN PRODUCING SHOWERS  
AND THUNDERSTORMS ALONG THE NORTHEAST/MID-ATLANTIC COAST INTO  
PARTS OF THE SOUTHEAST WESTWARD TO THE CENTRAL GULF COAST THROUGH  
MONDAY EVENING. IN ADDITION, AN UPPER-LEVEL LOW OVER THE GREAT  
LAKES/OHIO VALLEY AND THE NORTHERN/CENTRAL APPALACHIANS WILL ALSO  
AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER THE LOWER GREAT  
LAKES/OHIO VALLEY INTO THE NORTHERN/CENTRAL APPALACHIANS THROUGH  
TUESDAY.  
 
MEANWHILE, A SECOND UPPER-LEVEL LOW OVER THE SOUTHERN HIGH PLAINS  
WILL BE QUASI-STATIONARY THROUGH TUESDAY. THE ENERGY WILL AID IN  
PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE SOUTHERN  
PLAINS INTO PARTS OF THE LOWER MISSISSIPPI VALLEY THROUGH TUESDAY,  
TOO. ON MONDAY, THE SHOWERS AND THUNDERSTORMS WILL EXPAND INTO  
PARTS OF THE CENTRAL PLAINS/MIDDLE MISSISSIPPI VALLEY.  
ADDITIONALLY, A FRONT EXTENDING FROM THE NORTHERN HIGH PLAINS  
SOUTHWESTWARD INTO THE GREAT BASIN WILL MOVE EASTWARD TO THE UPPER  
MISSISSIPPI VALLEY/NORTHERN PLAINS INTO PARTS OF THE CENTRAL  
ROCKIES/GREAT BASIN BY MONDAY EVENING. SHOWERS AND THUNDERSTORMS  
WILL BEGIN TO DEVELOP ALONG AND AHEAD OF THE BOUNDARY ON SUNDAY  
EVENING OVER PARTS OF THE NORTHERN HIGH PLAINS INTO PARTS OF THE  
GREAT BASIN. THE SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER  
PARTS OF THE NORTHERN HIGH PLAINS/NORTHERN ROCKIES THROUGH MONDAY  
EVENING. FURTHERMORE, WEAK MONSOONAL MOISTURE AND DAYTIME HEATING  
WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE  
SOUTHWEST/GREAT BASIN AND PARTS OF THE CENTRAL/SOUTHERN ROCKIES ON  
SUNDAY AND MONDAY LATE AFTERNOON INTO LATE EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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