796
FXUS63 KIWX 261755
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
155 PM EDT THU JUN 26 2025
KEY MESSAGES
- HOT AND HUMID CONDITIONS CONTINUE TODAY RESULTING IN A HIGH
HEAT RISK.
- MARGINAL RISK OF SEVERE THUNDERSTORMS THROUGH THIS EVENING
WITH STRONG GUSTY WINDS AND EXCESSIVE RAINFALL THE MAIN
THREATS.
- SLIGHTLY MORE MILD TEMPERATURES ON SATURDAY BEFORE A BRIEF
WARM UP AGAIN ON SUNDAY AND MONDAY.
DISCUSSION
ISSUED AT 151 PM EDT THU JUN 26 2025
ANOTHER HOT AND HUMID DAY WITH HIGHS TOPPING OUT AROUND 90
DEGREES AND HEAT INDICIES NEAR 100 AFTER YOU COMBINE IN THE
HUMIDITY. SENSITIVE POPULATIONS SHOULD CONTINUE TO TAKE EXTRA
PRECAUTIONS AGAINST THE HEAT. MODERATE TO STRONG INSTABILITY
AND PWAT AROUND 1.6IN WILL PROMOTE CONVECTION THROUGH THE REST
OF THE AFTERNOON, AS WE HAVE ALREADY BEGUN TO SEE LATE MORNING
AND EARLY AFTERNOON ACROSS THE MICHIANA REGION. WEAK OVERALL
SHEAR WILL INHIBIT SUSTAINED UPDRAFTS, AND STORMS SHOULD BE
PULSE-LIKE WITH STRONG GUSTY OUTFLOW WINDS BEING THE PREDOMINANT
THREAT (IN ADDITION TO LIGHTNING AND LOCALIZED HEAVY RAIN, OF
COURSE).
A COLD FRONT WILL EVENTUALLY WORK ITS WAY INTO THE AREA ON
FRIDAY. ADDITIONAL SHOWERS AND STORMS WILL BE EXPECTED (60-70%
CHANCE) AS THIS FRONT MOVES THROUGH THE AREA. BY SATURDAY,
TEMPERATURES WILL HAVE "COOLED" DOWN SLIGHTLY INTO THE LOW-MID
80S. RAIN CHANCES FAVOR THE SOUTHERN HALF OF OUR FORECAST AREA
ON SAT.
WARMER TEMPERATURES RETURN SUNDAY AND MONDAY. HOWEVER, SURFACE
HIGH PRESSURE BUILDING OVER THE CENTRAL PLAINS AND TROUGHINESS
RETURNING TO ONTARIO/GREAT LAKES REGION WHICH WILL COOL US DOWN
A LITTLE BIT FOR THE FIRST COUPLE OF JULY DAYS. HOPEFULLY THE
RETURN OF DEWPOINTS BACK IN THE 60S VS THE 70S WE'VE BEEN
EXPERIENCING WILL BE A WELCOME RELIEF.
AVIATION /18Z TAFS THROUGH 18Z FRIDAY/
ISSUED AT 133 PM EDT THU JUN 26 2025
TSTMS HAVE FIRED ACROSS SOUTHERN MI BETWEEN THE I94 AND I80
CORRIDORS WHILE MORE WIDELY SCTD ACROSS NRN IN.THIS TREND IS
EXPECTED TO CONTINUE THROUGH THE REST OF THE AFTN AND EVENING
PERIOD, SO WILL EMPHASIZE THE SBN TERMINAL SITE FOR CONVECTION
THROUGH 00Z. THUS FAR, THE STORMS HAVE REMAINED BELOW SVR
CRITERIA AS THEY ARE PULSE IN NATURE. THE FLOW IS PREDOMINATELY
SW FOR BOTH SITES AND WILL CARRY THIS INTO THE NIGHT HOURS THEN
WINDS TURN MORE SOUTHERLY OVERNIGHT AT KSBN. THE HEAT AND
ELEVATED HUMIDITY LEVELS CONTINUE FRIDAY AND COUPLED WITH THE
UPPER RIDGING WEAKENING, EXPECT A CONTINUATION OF TSTM
DEVELOPMENT WITH DAYTIME HEATING.
IWX WATCHES/WARNINGS/ADVISORIES
IN...HEAT ADVISORY UNTIL 8 PM EDT /7 PM CDT/ THIS EVENING FOR
INZ005>009-012>015-017-018-020-022>027-032>034-103-104-
116-203-204-216.
OH...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR OHZ001-002-004-
005-015-016-024-025.
MI...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR MIZ078>081-177-
277.
MARINE...NONE.
DISCUSSION...NORMAN
AVIATION...FRAZIER
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