749 

FXUS63 KIWX 291740

AFDIWX



Area Forecast Discussion

National Weather Service Northern Indiana

140 PM EDT Mon Jun 29 2026



.KEY MESSAGES...



- Extreme Heat Warning is in effect through Thursday evening 

  for an extended period of high heat indices and limited 

  nighttime cooling. 



- Heat may remain a concern Friday, but chances for showers and

  thunderstorms begin to increase resulting in lower confidence

  on the amount of impacts.



&&



.DISCUSSION...

Issued at 140 PM EDT Mon Jun 29 2026



Forecast generally on track with the main focus into Thursday 

remaining on the extended period of heat and humidity. Dewpoints 

continue to climb and are somewhat concerning as hints of some of 

the model blends are appearing as pockets of 76 to 78 degree values 

are being noted even back into IL. Always a fine balance on how warm 

air temps can get as the very high dewpoints arrive, but low to mid 

90s still seem reasonable over the next several days. A strong mid 

level cap, depicted by 700 mb temps of +12 to +15 C, should keep any 

convective chances nearly non existent through at least Wednesday. 



Starting Thursday the upper level ridge begins to weak ever so 

slightly and may allow for some widely scattered shower/storm 

development mainly in the west or northwest. The ridge slowly gives 

way over the weekend, especially Sunday into next week as it 

flattens out somewhat. Chances for convection will generally be 

diurnal, but will need to monitor for upstream complexes each day 

and possible impacts. As for heat concerns, the warning continues 

into Thursday with some potential for extension into Friday. 





&&



.AVIATION /18Z TAFS THROUGH 18Z TUESDAY/...

Issued at 112 PM EDT Mon Jun 29 2026



VFR conditions expected through this TAF period. Some haze/mist

certainly would be possible over the next several days but at

this time confidence is low and have left any mention in the

overnight hours even with the small dewpoint depressions. Also,

a few to scattered flat cumulus may be possible with the 

daytime heating/surface instability but likely around 5000 ft

and again not high confidence at this time. Southwesterly winds

will become breezy by Tuesday afternoon with the diurnal heating

and gusts up to 20 kts expected.



&&



.IWX WATCHES/WARNINGS/ADVISORIES...

IN...Extreme Heat Warning until 8 PM EDT /7 PM CDT/ Thursday for 

     INZ005>009-012>015-017-018-020-022>027-032>034-103-104-

     116-203-204-216.

OH...Extreme Heat Warning until 8 PM EDT Thursday for OHZ001-002-

     004-005-015-016-024-025.

MI...Extreme Heat Warning until 8 PM EDT Thursday for MIZ078>081-

     177-277.

     Air Quality Alert from midnight tonight to midnight EDT 

     Tuesday night for MIZ177-277.

MARINE...None.



&&



$$



DISCUSSION...Fisher

AVIATION...Andersen