409  
FXUS63 KIWX 221747  
AFDIWX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NORTHERN INDIANA  
147 PM EDT FRI SEP 22 2017  
   
SYNOPSIS
 
 
ISSUED AT 350 AM EDT FRI SEP 22 2017  
 
VERY WARM AND DRY WEATHER WILL PERSIST INTO THE MIDDLE OF NEXT WEEK  
AS HIGH PRESSURE REMAINS OVER THE GREAT LAKES. HIGHS WILL RANGE  
FROM THE UPPER 80S TO THE LOWER 90S WITH LOWS IN THE 60S FOR THE  
NEXT SEVERAL DAYS.  
 

 
   
SHORT TERM
 
(TONIGHT AND SATURDAY)  
ISSUED AT 145 PM EDT FRI SEP 22 2017  
 
SFC RIDGE PARKED THROUGH THE OH VALLEY WILL EXPAND/INTENSIFY THIS  
PERIOD. AS IT DOES LOW LEVEL FLOW TRAJECTORIES WILL A BIT MORE  
EASTERLY AND TEMPER OTHERWISE HOT THERMAL RIDGE. OTHERWISE SENSIBLE  
WX NIL.  
 

 
   
LONG TERM
 
(SUNDAY THROUGH THURSDAY)  
ISSUED AT 145 PM EDT FRI SEP 22 2017  
 
UPPER RIDGE WILL SLOWLY BREAKDOWN BY TUE IN RESPONSE TO ERN SEABOARD  
APPROACH OF HRCN MARIA AND WWD EJECTION OF LEAD SW IMPLUSE THROUGH  
THE NRN PLAINS AND SUBSEQUENTLY COLLAPSE LATE WEEK IN RESPONSE TO  
POTENT SW TROUGH DIGGING SEWD OUT OF CANADA INTO THE GREAT LAKES.  
THIS WILL MARK A SIGNIFICANT COOLDOWN WITH BELOW NORMAL TEMPS BY SAT.  
 
IN THE TRANSISTION POORLY FORCED AND MOISTURE LIMITED COLD FRONT  
WILL PUSH THROUGH THE AREA LATE TUE NIGHT-WED MORNING AND HOLD WITH  
MINIMALISTIC POPS.  
 

 
   
AVIATION
 
(FOR THE 18Z TAFS THROUGH 18Z SATURDAY AFTERNOON)  
ISSUED AT 100 PM EDT FRI SEP 22 2017  
 
RIDGING SFC AND ALOFT WILL REMAIN PARKED OVER THE GREAT LAKES THIS  
PERIOD WITH WX NIL. SOME EXPANSION/INTENSIFICATION IN SFC RIDGE AND  
LIGHT BACKING FLOW SHOULD YIELD A BIT MORE BR POTENTIAL EARLY SAT  
MORNING AND HELD WITH PREVIOUS MVFR MENTION LATE TONIGHT. COULD EVEN  
SEE A PERIOD OF IFR VSBY RESTRICTION INVOF KFWA TOWARD DAYBREAK YET  
WILL PUNT THAT POTENTIAL TO LATER FCSTS.  
 

 
   
IWX WATCHES/WARNINGS/ADVISORIES
 
 
IN...NONE.  
MI...NONE.  
OH...NONE.  
LM...NONE.  

 
 

 
 
SYNOPSIS...MURPHY  
SHORT TERM...T  
LONG TERM...T  
AVIATION...T  
 
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