074  
FXUS01 KWBC 241957  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
357 PM EDT FRI AUG 24 2018  
 
VALID 00Z SAT AUG 25 2018 - 00Z MON AUG 27 2018  
 
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF  
THE MIDDLE MISSISSIPPI VALLEY...  
 
AN UPPER-LEVEL LOW OVER THE UPPER MISSISSIPPI VALLEY/UPPER GREAT  
LAKES WILL MOVE EASTWARD TO QUEBEC BY SUNDAY. THE SYSTEM WILL  
PRODUCE SHOWERS AND THUNDERSTORMS OVER PARTS OF THE UPPER/MIDDLE  
MISSISSIPPI VALLEY AND UPPER GREAT LAKES/WESTERN OHIO VALLEY THAT  
WILL MOVE EASTWARD TO THE LOWER GREAT LAKES INTO THE OHIO VALLEY  
BY SUNDAY. IN ADDITION, TROPICAL MOISTURE AND WEAK UPPER-LEVEL  
IMPULSES WILL AID IN DEVELOPING SHOWERS AND THUNDERSTORMS OVER  
PARTS OF THE SOUTHEAST/EASTERN GULF COAST THROUGH SUNDAY.  
 
MEANWHILE, A FRONT EXTENDING FROM THE NORTHERN HIGH PLAINS  
SOUTHWESTWARD INTO THE GREAT BASIN WILL MOVE EASTWARD TO THE UPPER  
GREAT LAKES/UPPER MISSISSIPPI VALLEY SOUTHWESTWARD TO THE CENTRAL  
PLAINS BY SUNDAY. THE SYSTEM WILL AID IN PRODUCING SHOWERS AND  
THUNDERSTORMS OVER THE NORTHERN HIGH PLAINS THAT WILL MOVE INTO  
PARTS OF THE UPPER GREAT LAKES/UPPER MISSISSIPPI VALLEY  
SOUTHWESTWARD INTO THE CENTRAL PLAINS BY SUNDAY. A SECOND FRONT  
WILL DEVELOP OVER PARTS OF THE NORTHERN ROCKIES/NORTHERN  
INTERMOUNTAIN REGION ON SATURDAY AFTERNOON THAT WILL EXTEND INTO  
PARTS OF THE NORTHERN HIGH PLAINS BY SUNDAY. THE ENERGY  
ASSOCIATED WITH THE BOUNDARY WILL AID IN PRODUCING LIGHT RAIN OVER  
PARTS OF THE PACIFIC NORTHWEST ON SATURDAY AFTERNOON INTO SUNDAY  
MORNING. SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND NEAR  
THE FRONT OVERNIGHT SATURDAY INTO SUNDAY.  
 
ELSEWHERE, UPPER-LEVEL ENERGY OVER THE ARIZONA/MEXICAN BORDER WILL  
MOVE NORTHEASTWARD TO THE CENTRAL HIGH PLAINS BY SUNDAY. THE  
ENERGY AND MONSOONAL MOISTURE WILL AID IN PRODUCING SHOWERS AND  
THUNDERSTORMS OVER PARTS OF THE SOUTHWEST/GREAT BASIN AND THE  
CENTRAL/SOUTHERN ROCKIES THROUGH SUNDAY. THE SHOWERS AND  
THUNDERSTORMS WILL HAVE THE GREATEST AREAL COVERAGE DURING THE  
LATE AFTERNOON INTO THE LATE EVENING ON FRIDAY AND SATURDAY.  
 
 
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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