121  
FXUS63 KILX 140415  
AFDILX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LINCOLN IL  
1115 PM CDT THU AUG 13 2020  
   
SYNOPSIS
 
 
ISSUED AT 318 PM CDT THU AUG 13 2020  
 
A STATIONARY BOUNDARY STILL SITTING ACROSS SOUTHERN ILLINOIS WILL  
CONTINUE TO PROVIDE THE FOCUS FOR SHOWERS AND THUNDERSTORMS  
ACROSS SOUTHEAST ILLINOIS TONIGHT THROUGH TOMORROW. OVERNIGHT LOWS  
WILL DROP BACK INTO THE 60S, WHILE AFTERNOON TEMPERATURES  
TOMORROW WILL CLIMB BACK INTO THE MIDDLE TO UPPER 80S.  
 

 
   
UPDATE
 
 
ISSUED AT 742 PM CDT THU AUG 13 2020  
 
LINGERING STATIONARY BOUNDARY REMAINS TO OUR SOUTH THIS EVENING.  
SHOWERS AND SCATTERED THUNDERSTORMS REMAIN NEAR AND SOUTH OF  
OLNEY/LAWRENCEVILLE AS A WEAK UPPER WAVE MOVES INTO THE LOWER OHIO  
VALLEY. NOT MUCH CHANGE EXPECTED ACROSS THIS REGION OVERNIGHT,  
WHILE THE NORTHERN CWA REMAINS UNDER THE INFLUENCE OF HIGH  
PRESSURE CENTERED NORTH OF THE GREAT LAKES. FORECAST IS GENERALLY  
ON TRACK AND ONLY MINOR ADJUSTMENTS HAVE BEEN MADE.  
 

 
   
SHORT TERM
 
(THIS EVENING THROUGH FRIDAY)  
ISSUED AT 318 PM CDT THU AUG 13 2020  
 
A STATIONARY BOUNDARY STILL REMAINS IN SOUTHERN IL AND WILL STAY  
AS THE FOCUS FOR SLOW MOVING SHOWERS AND THUNDERSTORMS ACROSS  
SOUTHEAST IL TONIGHT AND AGAIN TOMORROW. TEMPERATURES TONIGHT WILL  
FALL INTO THE MIDDLE 60S UP NORTH WHERE THERE WILL BE FEWER  
CLOUDS, BUT ONLY DROP INTO THE UPPER 60S ACROSS THE SOUTHEAST  
WHERE THERE WILL BE MORE CLOUDS. WARM AND MUGGY CONDITIONS ARE  
EXPECTED TOMORROW WITH AFTER HIGHS REACHING THE MIDDLE TO UPPER  
80S.  
 

 
   
LONG TERM
 
(FRIDAY NIGHT THROUGH THURSDAY)  
ISSUED AT 318 PM CDT THU AUG 13 2020  
 
THE STATIONARY FRONT WILL FINALLY WASH OUT TOMORROW NIGHT, LEAVING  
THE AREA WITH DRY WEATHER FOR FRIDAY NIGHT. HOWEVER, A COLD FRONT  
WILL APPROACH THE AREA SATURDAY AND BRING A CHANCE OF SHOWERS AND  
THUNDERSTORMS TO CENTRAL ILLINOIS, BUT MAINLY NORTHWEST OF I-55.  
THERE IS A SLIGHT CHANCE THAT SOME OF THE PRECIP COULD REACH EAST  
OF THERE, BUT MODELS ARE SHOWING A WEAKENING TREND AS THE FRONT  
MOVES TO THE EAST INTO THE EVENING HOURS. SO, SAT NIGHT FORECAST  
IS FOR DRY WEATHER WITH THE BEST CHANCE OF ANY PRECIP BEING WELL  
NORTH OF THE AREA. BEYOND THIS, THE REMAINDER OF THE EXTENDED  
PERIOD CALLS FOR DRY CONDITIONS AND TEMPS COOLING DOWN INTO THE  
UPPER 70S BY TUE THROUGH THUR OF NEXT WEEK. OVERNIGHT LOWS THROUGH  
THE PERIOD WILL BE MUCH COOLER, REACHING INTO THE 50S.  
 

 
   
AVIATION
 
(FOR THE 06Z TAFS THROUGH 06Z FRIDAY NIGHT)  
ISSUED AT 1115 PM CDT THU AUG 13 2020  
 
VFR CONDITIONS EXPECTED TO GENERALLY PREVAIL. A FEW CLOUDS AROUND  
4,000 FEET HAVE RECENTLY DEVELOPED, AND SHOULD PICK UP AGAIN LATE  
FRIDAY MORNING WITH DIURNAL HEATING. HOWEVER, THAT WOULD PROBABLY  
BE MORE OF AN IMPACT ALONG THE KSPI-KCMI CORRIDOR.  
 

 
   
ILX WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
UPDATE...GEELHART  
SYNOPSIS...AUTEN  
SHORT TERM...AUTEN  
LONG TERM...AUTEN  
AVIATION...GEELHART  
 
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