560  
FXUS01 KWBC 250800  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
359 AM EDT SAT AUG 25 2018  
 
VALID 12Z SAT AUG 25 2018 - 12Z MON AUG 27 2018  
 
...SHOWERS AND THUNDERSTORMS EXPECTED ACROSS THE MID/UPPER  
MISSISSIPPI VALLEY AND INTO THE UPPER GREAT LAKES TODAY...  
 
...A SLIGHT RISK OF SEVERE STORMS SUNDAY INTO MONDAY FOR PORTIONS  
OF THE NORTHERN PLAINS, UPPER MIDWEST, AND UPPER GREAT LAKES...  
 
...DRY AND WINDY CONDITIONS ACROSS THE WEST WILL CONTINUE TO FUEL  
FIRE CONCERNS...  
 
A FRONTAL SYSTEM SILL MOVE NORTHEAST FROM THE MID/UPPER  
MISSISSIPPI VALLEY INTO THE UPPER GREAT LAKES TODAY, WHILE LOSING  
CONSIDERABLE STRENGTH. THE CENTER OF LOW PRESSURE WILL STAY  
INTACT, HOWEVER, AS WILL A STRONG PULL OF WARM MOIST AIR FROM THE  
GULF OF MEXICO. THIS WILL LEAD TO SCATTERED TO NUMEROUS SHOWERS  
AND THUNDERSTORMS ACROSS THE REGION DURING THE DAY. THE WEATHER  
PREDICTION CENTER HAS ISSUED A SLIGHT RISK OF EXCESSIVE RAINFALL  
FOR A PORTION OF NORTHWEST MISSOURI AND WESTERN ILLINOIS THROUGH  
TODAY, WITH A MARGINAL RISK ACROSS PORTIONS OF THE UPPER AND MID  
MISSISSIPPI VALLEY AS WELL AS THE OHIO VALLEY.  
 
MEANWHILE, ANOTHER FRONTAL AND LOW PRESSURE SYSTEM WILL BEGIN  
EVOLVING UPSTREAM, GAINING STRENGTH AS WE GO THROUGH THE WEEKEND.  
THIS SYSTEM WILL CROSS THE CENTRAL AND NORTHERN PLAINS DURING THIS  
TIME, WITH SHOWERS AND THUNDERSTORMS DEVELOPING ALONG THE FRONTAL  
BOUNDARIES AND NEAR THE STRENGTHENING LOW PRESSURE CENTER. THE  
STORM PREDICTION CENTER HAS ISSUED A TWO SLIGHT RISK AREAS FOR  
SEVERE THUNDERSTORMS DURING THE DAY TOMORROW, ONE ACROSS A  
PORTIONS OF THE NORTHERN PLAINS, AND ANOTHER ENCOMPASSING SOUTHERN  
WISCONSIN, NORTHERN ILLINOIS, AND MUCH OF LOWER MICHIGAN. A SLIGHT  
RISK OF SEVERE WEATHER IS ALSO EXPECTED ON MONDAY STRETCHING FROM  
THE UPPER MISSISSIPPI VALLEY TO THE UPPER PENINSULA OF MICHIGAN.  
THE WEATHER PREDICTION CENTER HAS ALSO OUTLINED A SLIGHT RISK AREA  
FOR POTENTIAL FLOODING ENCOMPASSING MUCH OF WISCONSIN FOR MONDAY  
AS WELL.  
 
MONSOONAL MOISTURE WILL CONTINUE TO SPARK SHOWERS AND  
THUNDERSTORMS ACROSS THE SOUTHWEST, SPREADING NORTHEAST INTO THE  
SOUTHERN AND CENTRAL ROCKIES FOR THE SECOND HALF OF THE WEEKEND.  
HOWEVER, FIRE WEATHER WILL CONTINUE TO BE THE TOPIC ACROSS THE  
REMAINDER OF THE WESTERN U.S. OVER THE NEXT SEVERAL DAYS. RED FLAG  
WARNINGS ARE IN EFFECT FOR PORTIONS OF IDAHO AND SOUTHWEST WYOMING  
TODAY, WHILE FIRE WEATHER WATCHES ARE IN EFFECT FOR MUCH OF THE  
CENTRAL GREAT BASIN, AS WELL AS PORTIONS OF CALIFORNIA AND WYOMING  
FOR SUNDAY. FURTHERMORE, ONGOING WILDFIRES CONTINUE TO POLLUTE THE  
AIR WITH LARGE AMOUNTS OF SMOKE. AIR QUALITY ALERTS CONTINUE  
ACROSS CENTRAL CALIFORNIA, AS WELL AS PORTIONS OF WASHINGTON,  
OREGON, IDAHO, AND MONTANA.  
 
 
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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