078  
FXUS01 KWBC 190753  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
353 AM EDT SUN AUG 19 2018  
 
VALID 12Z SUN AUG 19 2018 - 12Z TUE AUG 21 2018  
 
...HEAVY RAINFALL AND STRONG THUNDERSTORMS EXPECTED TO IMPACT  
PARTS OF THE PLAINS AND MISSISSIPPI VALLEY...  
 
...AIR QUALITY WILL REMAIN A CONCERN ACROSS PORTIONS OF THE  
WESTERN U.S. AND THE UPPER MIDWEST...  
 
A LOW PRESSURE SYSTEM IN THE SOUTHERN PLAINS WILL LIFT INTO THE  
CENTRAL PLAINS AND MIDDLE MISSISSIPPI VALLEY TODAY. HEAVY RAIN  
ALREADY IMPACTING THE CENTRAL AND SOUTHERN PLAINS WILL CONTINUE TO  
MOVE EASTWARD TODAY ACROSS THESE AREAS AND MOVE INTO THE MIDDLE  
AND LOWER MISSISSIPPI VALLEY BY THIS EVENING. FARTHER NORTH, A  
COLD FRONT WILL PRESS SOUTHWARD ALONG THE NORTHERN PLAINS AND  
UPPER MISSISSIPPI VALLEY. SHOWERS AND THUNDERSTORMS ARE EXPECTED  
TO DEVELOP ALONG AND AHEAD OF THE FRONT--WHICH WILL BE CAPABLE OF  
PRODUCING FLASH FLOODING. A SLIGHT RISK OF FLASH FLOODING IS  
POSSIBLE FOR PARTS OF NORTHERN PLAINS IN ADDITION TO PORTIONS OF  
THE CENTRAL AND SOUTHERN PLAINS. THERE IS ALSO A MARGINAL RISK OF  
SEVERE WEATHER FOR THE SOUTHERN PLAINS AND INTO THE LOWER  
MISSISSIPPI VALLEY. AS THIS SYSTEM SLIDES FROM THE MISSISSIPPI  
VALLEY INTO THE OHIO VALLEY, SHOWERS AND THUNDERSTORMS WILL  
DEVELOP IN IOWA ON MONDAY AFTERNOON AND WILL PROGRESS INTO  
SOUTHERN WISCONSIN AND NORTHERN ILLINOIS. BY TUESDAY MORNING,  
SHOWERS AND THUNDERSTORMS WILL INCREASE THROUGHOUT THE GREAT  
LAKES, OHIO VALLEY SOUTHWARD INTO THE LOWER MISSISSIPPI VALLEY.  
 
FIRE WEATHER CONTINUES TO REMAIN A CONCERN ACROSS THE WESTERN U.S.  
THE COMBINATION OF HIGH WINDS, LOW HUMIDITIES, AND THE THREAT OF  
LOW PRECIPITATING THUNDERSTORMS MAY CONTRIBUTE TO IGNITING  
WILDFIRES. DUE TO THE ONGOING WILDFIRES, AIR QUALITY ALERTS REMAIN  
IN PLACE FOR THE PACIFIC NORTHWEST, NORTHERN MONTANA AND A SMALL  
PORTION OF THE SOUTHWEST DUE TO SMOKE POLLUTION. IN ADDITION,  
WILDFIRES IN CANADA ARE ALSO ADVECTING SMOKE SOUTHWARD ACROSS THE  
UPPER MIDWEST, RESULTING IN AIR QUALITY ALERTS FOR MUCH OF  
MINNESOTA AS WELL.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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