996  
FXUS01 KWBC 231956  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
356 PM EDT THU AUG 23 2018  
 
VALID 00Z FRI AUG 24 2018 - 00Z SUN AUG 26 2018  
 
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF  
THE NORTHERN AND CENTRAL PLAINS...  
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE MIDDLE MISSISSIPPI  
VALLEY...  
 
AN UPPER-LEVEL LOW OVER THE NORTHERN PLAINS WILL MOVE EASTWARD TO  
THE UPPER GREAT LAKES BY SATURDAY. THE UPPER-LEVEL ENERGY AND  
UPPER-LEVEL JET DYNAMICS WILL AID IN PRODUCING SHOWERS AND  
THUNDERSTORMS OVER PARTS OF THE NORTHERN PLAINS INTO THE MIDDLE  
MISSISSIPPI VALLEY THAT WILL MOVE EASTWARD TO THE GREAT  
LAKES/WESTERN OHIO VALLEY INTO THE MIDDLE MISSISSIPPI VALLEY AND  
PARTS OF THE SOUTHERN HIGH PLAINS BY SATURDAY. IN ADDITION,  
TROPICAL MOISTURE AND UPPER-LEVEL IMPULSES WILL AID IN TRIGGERING  
SHOWERS AND THUNDERSTORMS OVER PARTS OF THE SOUTHEAST AND THE  
EASTERN GULF COAST THROUGH SATURDAY.  
 
MEANWHILE, A FRONT OVER THE PACIFIC NORTHWEST WILL MOVE INLAND TO  
THE NORTHERN PLAINS SOUTHWESTWARD TO THE GREAT BASIN BY SATURDAY.  
SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND NEAR THE BOUNDARY  
OVER THE NORTHERN HIGH PLAINS STARTING FRIDAY EVENING. THE  
SHOWERS AND THUNDERSTORMS WILL MOVE INTO THE NORTHERN PLAINS BY  
SATURDAY. ADDITIONALLY, MONSOONAL MOISTURE AND UPPER-LEVEL ENERGY  
WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE  
SOUTHWEST/GREAT BASIN AND THE CENTRAL/SOUTHERN ROCKIES THROUGH  
SATURDAY. THE SHOWERS AND THUNDERSTORMS WILL HAVE THE GREATEST  
AREAL COVERAGE DURING THE LATE AFTERNOON INTO THE LATE EVENING ON  
THURSDAY AND FRIDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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