943  
FXUS01 KWBC 260801  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
400 AM EDT SUN AUG 26 2018  
 
VALID 12Z SUN AUG 26 2018 - 12Z TUE AUG 28 2018  
   
..HEAVY RAIN EXPECTED FOR THE NORTH-CENTRAL U.S.
 
 
AND BUILDING HEAT ACROSS THE EASTERN STATES...  
 
AN UPPER LEVEL TROUGH IS EXPECTED ACROSS THE NORTHWESTERN U.S. AND  
THE DAKOTAS THROUGH THE BEGINNING OF THE WEEK WHILE AN UPPER LEVEL  
RIDGE BUILDS ACROSS THE EASTERN THIRD OF THE NATION. AN ACTIVE  
FRONTAL ZONE WILL STRETCH FROM THE CENTRAL GREAT BASIN, NORTHEAST  
THROUGH THE NORTHERN PLAINS AND ACROSS THE UPPER MISSSIPPI VALLEY  
TODAY, WITH MULTIPLE LOW PRESSURE CENTERS EXPECTED TO DEVELOP  
ALONG THE BOUNDARY. THIS BOUNDARY IS THEN EXPECTED TO SLOWLY  
STRAIGHTEN OUT AS IT PUSHES SOUTHEAST OVER THE COMING DAYS.  
SHOWERS AND THUNDERSTORMS ARE EXPECTED ALONG THE FRONTAL BOUNDARY,  
ESPECIALLY NEAR ANY LOW PRESSURE CENTERS. THE STRONGEST AREA OF  
LOW PERSSURE WILL BE FOUND ACROSS THE NORTHERN PLAINS TODAY, WITH  
THE STORM PREDICTION CENTER OUTLINING A LARGE AREA STRETCHING FROM  
THE DAKOTAS EASTWARD ACROSS WISCONSIN AS BEING IN A SLIGHT RISK  
FOR SEVERE THUNDERSTORM DEVELOPMENT TODAY. THE WEATHER PREDICTION  
CENTER HAS ALSO OUTLINED A PORTION OF THIS REGION AS BEING IN A  
SLIGHT RISK FOR EXCESSIVE RAINFALL AND FLASH FLOODING. AS THE  
FRONT PROGRESSES SLOWLY EASTWARD ON MONDAY, THE SLIGHT RISK AREA  
FOR SEVERE THUNDERSTORMS AND EXCESSIVE RAINFALL WILL FOCUS ITESELF  
ACROSS THE UPPER MIDWEST AND UPPER GREAT LAKES REGION.  
 
MEANWHILE, ACROSS MUCH OF THE EASTERN U.S., A STRONG RIDGE OF HIGH  
PRESSURE WILL BE IN PLACE. THIS WILL COUPLE WITH STRONG SOUTHERLY  
FLOW HEADING TOWARDS THE ABOVE MENTIONED FRONTAL SYSTEM, LEADING  
TO HOT AND HUMID CONDITIONS OVER THE COMING DAYS. THE HEAT IS  
EXPECTED TO CONTINUE UNTIL AFTER THE COLD FRONT HAS PASSED  
THROUGH, WHICH COULD MEAN PERSISTANT ABOVE NORMAL TEMPERATURES FOR  
MUCH OF THE EAST AND SOUTHEAT THROUGH MOST OF THE WEEK. SEVERAL  
HEAT ADVISORIES HAVE BEEN POSTED FOR TODAY, INCLUDING NEAR THE  
KANSAS CITY AND ST. LOUIS METROPOLITAN AREAS, AS WELL AS MUCH OF  
EASTERN OKLAHOMA, AND NORTHEAST ARKANSAS WHERE HEAT INDICES WILL  
LIKELY TOP OUT IN THE TRIPPLE DIGITS.  
 
FOR THE WESTERN U.S., FIRE WEATHER CONCERNS RAGE ON. HIGH WINDS  
AND LOW HUMIDITY HAVE LED TO RED FLAG WARNINGS TODAY ACROSS ACROSS  
MUCH OF THE CENTRAL GREAT BASIN (CENTRAL AND NORTHERN NEVADA AS  
WELL AS WESTERN UTAH), AND ACROSS MUCH OF WYOMING, WESTERN  
NEBRASKA, AND SOUTHWEST SOUTH DAKOTA. ONGOING WILDFIRES CONTINUE  
TO CONTAMINATE THE AIR WITH SMOKE, CONTINUING AIR QUALITY ALERTS  
ACROSS THE REGION. AREAS AFFECTED BY AIR QUALITY ALERTS TODAY  
INCLUDE CENTRAL CALIFORNIA, SOUTHERN OREGON, MUCH OF WASHINGTON,  
SOUTHEAST AND NORTHERN IDAHO, AND NORTHWEST MONTANA.  
 
FINALLY, LINGERING MONSOONAL MOISTURE WILL LEAD TO SCATTERED  
SHOWERS AND THUNDERSTORMS STRETCHING FROM THE SOUTHWEST AND INTO  
THE SOUTHERN AND CENTRAL ROCKIES TODAY. A MARGINAL RISK OF  
EXCESSIVE RAINFALL REMAIN IN PLACE ACROSS A PORTION OF ARIZONA AND  
NEW MEXICO TODAY.  
 
WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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