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
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