715  
FXUS63 KIND 201428  
AFDIND  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE INDIANAPOLIS IN  
1028 AM EDT WED SEP 20 2017  
   
UPDATE
 
 
THE AVIATION SECTION HAS BEEN UPDATED BELOW.  
 

 
   
SYNOPSIS
 
 
ISSUED AT 352 AM EDT WED SEP 20 2017  
 
A RIDGE OF HIGH PRESSURE WILL BEGIN STRENGTHENING TODAY OVER THE  
GREAT LAKES, BRINGING CONTINUED UNSEASONABLE WARMTH AND DRY  
WEATHER TO THE AREA FOR THE NEXT WEEK.  
 

 
   
NEAR TERM /TODAY/
 
 
ISSUED AT 955 AM EDT WED SEP 20 2017  
 
SOME DENSE PATCHY FOG CONTINUES IN CENTRAL INDIANA, WITH THE LOWEST  
VISIBILITIES OVER THE EASTERN HALF OR SO OF THE FORECAST AREA.  
WEBCAMS INDICATE CONDITIONS HAVE BEEN IMPROVING. WESTERN COUNTIES  
SHOULD BE FREE OF FOG WITHIN THE HOUR WITH EASTERN COUNTIES POSSIBLY  
HOLDING ONTO SOME PATCHY FOG UNTIL BETWEEN 11 AND NOON. EXPECT ALL  
FOG TO BE GONE BY NOON. AFTER THAT SKIES SHOULD BE MOSTLY CLEAR TO  
PARTLY CLOUDY GIVEN A WEAK WAVE CURRENTLY MOVING ACROSS ILLINOIS  
PROVIDING A FEW CLOUDS IN INDIANA THIS AFTERNOON. HIGH TEMPERATURES  
IN THE MID 80S EAST TO AROUND 90 WEST STILL LOOK ON TRACK AND NO  
CHANGES MADE THERE.  
 

 
   
SHORT TERM /TONIGHT THROUGH FRIDAY NIGHT/
 
 
ISSUED AT 352 AM EDT WED SEP 20 2017  
 
THE RIDGE WILL CONTINUE TO BE THE DOMINANT FEATURE THROUGHOUT THE  
SHORT TERM, THUS WILL CONTINUE WITH A FORECAST OF UNSEASONABLY  
WARM TEMPERATURES AND NO PRECIPITATION, ALBEIT IN A HUMID AIRMASS.  
CONSENSUS NUMBERS APPEARED REASONABLE THROUGHOUT THE PERIOD AND  
WERE GENERALLY ACCEPTED WITH MINOR TWEAKS.  
 

 
   
LONG TERM /THURSDAY THROUGH TUESDAY/
 
 
ISSUED AT 234 AM EDT WED SEP 20 2017  
 
LITTLE CHANGE IS EXPECTED DURING THIS FORECAST PERIOD. WEATHER  
CONDITIONS SHOULD BE DRY WITH ABOVE NORMAL TEMPERATURES.  
 
ECMWF SHOWS STRONG RIDGING REMAINING OVER THE EASTERN 1/2 OF THE  
UNITED STATES...KEEPING ALL FORCING DYNAMIC WELL NORTH OF INDIANA,  
MEANWHILE THE ECMWF SUGGESTS STRONG HIGH PRESSURE BUILDING BENEATH  
THE RIDGE...ASSOCIATED WITH THE ONGOING SUBSIDENCE. WITH MAINLY  
SOUTHWEST FLOW IN PLACE ACROSS THE AREA ALONG WITH A VERY WARM AIR  
MASS WILL TREND DAILY HIGHS AND LOWS AT OR ABOVE THE FORECAST  
BUILDER BLEND WHICH IS WELL ABOVE SEASONAL NORMALS. PARTLY CLOUDY  
NIGHTS AND MOSTLY SUNNY DAYS SHOULD WORK NICELY.  
 

 
   
AVIATION /DISCUSSION FOR THE 201500Z TAFS/
 
 
ISSUED AT 1028 AM EDT WED SEP 20 2017  
 
FOG HAS CLEARED OUT OF KLAF AND KHUF, AND SHOULD CLEAR OUT OF KIND  
AND KBMG BETWEEN 15 AND 16Z. AFTER THAT VFR EXPECTED. PREVIOUS  
DISCUSSION FOLLOWS...  
 
MODELS SUGGEST HIGH PRESSURE ACROSS THE AREA ALONG WITH SUBSIDENCE  
BUILDING ALOFT AS WATER VAPOR IMAGERY SHOWS A RIDGE OVER ILLINOIS  
BUILDING EASTWARD. FORECAST SOUNDINGS SUGGEST CONVECTIVE  
TEMPERATURES MAYBE REACHED THIS AFTERNOON...BUT DRYING AND  
SUBSIDENCE SHOULD PREVENT DEEP CONVECTION.  
 
ANY CLOUDS SHOULD BE LOST THIS EVENING AS DAYTIME HEATING IS  
LOST...AND CIGS WILL BE UNLIMITED OVERNIGHT.  
 

 
   
IND WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
SYNOPSIS...NIELD  
NEAR TERM...NIELD/CP  
SHORT TERM...NIELD  
LONG TERM...PUMA  
AVIATION...JP/CP  
 
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