217  
FXUS01 KWBC 250809  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
408 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...  
 
...MONSOONAL MOISTURE WILL LEAD TO SCATTERED AND POTENTIALLY HEAVY  
SHOWERS AND THUNDERSTORMS ACROSS THE SOUTHWEST...  
 
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 LOW PRESSURE SYSTEM WILL BEGIN EVOLVING  
UPSTREAM, GAINING STRENGTH AS WE HEAD THROUGH THE WEEKEND. THIS  
SYSTEM WILL CROSS THE CENTRAL AND NORTHERN PLAINS DURING THIS  
TIME, WITH SHOWERS AND THUNDERSTORMS DEVELOPING ALONG AND JUST  
AHEAD OF 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 SUNDAY,  
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 EASTWARD  
INTO 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.  
 
AS FOR THE WESTERN U.S.... MONSOONAL MOISTURE WILL SPARK SCATTERED  
SHOWERS AND THUNDERSTORMS ACROSS THE SOUTHWEST, SPREADING  
NORTHEAST INTO THE SOUTHERN AND CENTRAL ROCKIES FOR THE SECOND  
HALF OF THE WEEKEND. A SLIGHT RISK OF EXCESSIVE RAINFALL IS IN  
PLACE ACROSS A PORTION OF THE SOUTHERN AND CENTRAL ROCKIES ON  
SUNDAY. ON THE FLIP SIDE, FIRE WEATHER WILL CONTINUE TO BE THE  
TOPIC ACROSS THE REMAINDER OF THE WESTERN U.S. OVER THE NEXT  
SEVERAL DAYS WITH DRY AND WINDY WEATHER EXPECTED. 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.  
 
WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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