509  
FXUS01 KWBC 052005  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
404 PM EDT SUN AUG 05 2018  
 
VALID 00Z MON AUG 06 2018 - 00Z WED AUG 08 2018  
 
...UNSETTLED WEATHER EXPECTED TO SHIFT INTO THE MIDWEST AND GREAT  
LAKES REGION AS WE HEAD INTO THE WORK-WEEK....  
 
...FIRE WEATHER CONCERNS CONTINUE ACROSS THE PORTIONS OF THE  
WESTERN U.S....  
 
...EXCESSIVE HEAT TO RETURN TO PORTIONS OF THE WEST, SOUTHWEST,  
AND NORTHEAST...  
 
SCATTERED TO WIDESPREAD SHOWERS AND THUNDERSTORMS WILL CONTINUE AS  
A SERIES OF LOW PRESSURE SYSTEMS AND SURFACE FRONTS TRAVERSE  
EASTWARD FROM THE CENTRAL PLAINS TO THE GREAT LAKES REGION OVER  
THE NEXT COUPLE OF DAYS. ENOUGH INSTABILITY AND A MOISTURE WILL BE  
PRESENT TO RAISE CONCERN FOR SEVERE WEATHER AND FLASH FLOODING  
WITH THIS SYSTEM. THE MAIN CONCERNS FOR THIS AFTERNOON/EVENING AND  
INTO THE OVERNIGHT ARE ACROSS THE CENTRAL PLAINS, UPPER  
MISSISSIPPI VALLEY, AND UPPER GREAT LAKES, WHERE THE STORM  
PREDICTION CENTER HAS ISSUED A SLIGHT RISK FOR SEVERE  
THUNDERSTORMS. A SLIGHT RISK OF EXCESSIVE RAINFALL HAS ALSO BEEN  
OUTLINED BY THE WEATHER PREDICTION CENTER ACROSS NORTHERN IOWA AND  
PORTIONS OF THE SURROUNDING STATES THROUGH THE REMAINDER OF TODAY  
AND INTO OVERNIGHT. AS THIS SYSTEM CONTINUES TO SHIFT EASTWARD  
OVER THE COMING DAYS, SO TOO WILL THE RISK FOR STRONG  
THUNDERSTORMS AND EXCESSIVE RAINFALL. A SLIGHT RISK FOR SEVERE  
THUNDERSTORMS AND FLASH FLOODING IS OUTLINED ACROSS THE SOUTHERN  
EXTENT OF THE UPPER GREAT LAKES REGION AND NORTHERN PORTIONS OF  
THE MIDDLE MISSISSIPPI VALLEY FOR MONDAY.  
 
PERSISTENT DRY AND WINDY CONDITIONS OVER THE WEST WILL MAINTAIN AN  
ELEVATED RISK FOR FIRE DANGER. PORTIONS OF THE SOUTHWEST, ALONG  
WITH SOUTHERN CALIFORNIA, SOUTHWEST WYOMING, AND NORTHERN UTAH  
HAVE ONGOING RED FLAG WARNINGS. AIR QUALITY ALERTS ALSO REMAIN IN  
EFFECT FOR PORTIONS OF THE WESTERN AND SOUTHWESTERN U.S. AS  
ONGOING WILDFIRES CONTINUE TO INFUSE COPIOUS AMOUNTS OF SMOKE INTO  
THE AIR. FURTHERMORE, AS A STRONG RIDGE BUILDS BACK ACROSS THE  
SOUTHWEST AND WEST OVER THE COMING DAYS, EXPECT THE EXCESSIVE HEAT  
TO MAKE A RETURN. EXCESSIVE HEAT WATCHES AND WARNINGS ARE IN  
EFFECT ACROSS LARGE PORTIONS OF THE SOUTHWEST AND SOUTHERN  
CALIFORNIA, AS WELL AS THE PACIFIC NORTHWEST THROUGH AT LEAST  
MID-WEEK, AS TEMPERATURES ARE EXPECTED TO CLIMB TO WELL OVER 100  
DEGREES. ON THE OPPOSITE SIDE OF THE U.S., STRONG SOUTHERLY FLOW  
WILL PUMP HOT AND HUMID AIR INTO THE NORTHEAST, RESULTING IN ABOVE  
NORMAL TEMPERATURES AND EVEN HIGHER INDEX VALUES. HEAT ADVISORIES  
ARE IN EFFECT ACROSS MUCH OF THE NORTHEAST FOR MONDAY AND  
TUESDAY.A COLD FRONT WILL PASS THROUGH AFTER THIS POINT AND HELP  
TO COOL THINGS DOWN.  
 
WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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