598  
FXUS01 KWBC 240814  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
413 AM EDT FRI AUG 24 2018  
 
VALID 12Z FRI AUG 24 2018 - 12Z SUN AUG 26 2018  
 
...SEVERE STORMS AND EXCESSIVE RAINFALL POSSIBLE ACROSS PORTIONS  
OF THE UPPER AND MIDDLE MISSISSIPPI VALLEYS TODAY...  
 
...SHOWER AND THUNDERSTORM CHANCES FOR THE SOUTHWEST AND COASTAL  
SOUTHEAST...  
   
..FIRE CONCERNS PERSIST ACROSS THE WESTERN U.S.
 
 
A FRONTAL SYSTEM WILL CONTINUE TO EVOLVE ACROSS THE PLAINS TODAY  
AND MOVE EASTWARD TOWARDS THE MISSISSIPPI VALLEY. THE LOW PRESSURE  
CENTER ASSOCIATED WITH THIS SYSTEM WILL MOVE FROM THE NORTHERN  
PLAINS TO THE UPPER GREAT LAKES DURING THE COURSE OF THE DAY. A  
SURGE OF MOISTURE NORTHWARD FROM THE GULF OF MEXICO WILL LEAD TO  
SHOWERS AND THUNDERSTORMS ALONG THE LEADING EDGE OF THIS SYSTEM,  
WITH BEST COVERAGE ALONG AND JUST AHEAD OF THE CENTER OF LOW  
PRESSURE. THE STORM PREDICTION CENTER HAS OUTLINED A PORTION OF  
THE MIDDLE AND UPPER MISSISSIPPI RIVER VALLEY AS HAVING A SLIGHT  
CHANCE FOR SEVERE STORMS THROUGHOUT THE DAY TODAY. THE WEATHER  
PREDICTION CENTER HAS ALSO ISSUED A SLIGHT RISK FOR EXCESSIVE  
RAINFALL AND FLASH FLOODING ACROSS THE SAME GENERAL AREA. IN  
GENERAL, MISSOURI AND IOWA MAY HAVE THE BEST SHOT FOR STORM  
DEVELOPMENT TODAY. THIS SYSTEM WILL CONTINUE TO SHIFT EASTWARD  
THROUGH THE DAY SATURDAY, WHILE LOSING CONSIDERABLE STRENGTH.  
HOWEVER, HEAVY RAIN MAY PERSIST DURING THE DAY, LEADING THE  
WEATHER PREDICTION CENTER TO CONTINUE THE SLIGHT RISK OF EXCESSIVE  
RAINFALL FOR MUCH OF CENTRAL AND SOUTHERN WISCONSIN, AS WELL AS  
FAR NORTHERN ILLINOIS ON SATURDAY.  
 
ANOTHER FRONTAL SYSTEM ACROSS FLORIDA AND OFF THE ATLANTIC COAST  
WILL REMAIN STALLED OVER THE NEXT COUPLE OF DAYS, LEADING TO  
SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ACROSS FLORIDA AND  
COASTAL REGIONS ACROSS THE SOUTHEAST. MONSOONAL MOISTURE WILL  
BRING SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE SOUTHWEST  
OVER THE NEXT FEW DAYS AS WELL, MAINLY DURING THE AFTERNOON AND  
EVENING. THE WEATHER PREDICTION CENTER HAS ISSUED A MARGINAL RISK  
OF EXCESSIVE RAINFALL AND FLASH FLOODING ACROSS PORTIONS OF  
ARIZONA AND NEW MEXICO FOR THE WEEKEND, EXPANDING NORTHWARD INTO  
SOUTHERN COLORADO ON SUNDAY.  
 
MEANWHILE, FIRE WEATHER CONCERNS CONTINUE ACROSS THE WESTERN U.S..  
A RED FLAG WARNING IS IN EFFECT THROUGH THIS EVENING FOR MUCH OF  
EASTERN IDAHO DUE TO HIGH WINDS AND LOW RELATIVE HUMIDITIES,  
ESPECIALLY DURING THE AFTERNOON. FIRE WEATHER WATCHES ARE ALSO IN  
EFFECT FOR THE SIERRAS AND WESTERN NEVADA AND MUCH OF WESTERN AND  
CENTRAL WYOMING. ONGOING WILDFIRES CONTINUE TO LEAD TO LARGE  
AMOUNTS OF SMOKE IN THE AIR AND RESULTING AIR QUALITY CONCERNS.  
AIR QUALITY ALERTS REMAIN IN EFFECT FOR MUCH OF OREGON,  
WASHINGTON, IDAHO, AND NORTHWEST MONTANA.  
 
WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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