992
FXUS63 KIWX 251019
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
619 AM EDT WED JUN 25 2025
KEY MESSAGES
- PROLONGED HEAT WAVE CONTINUES WITH DANGEROUS AFTERNOON HEAT
INDICES REACHING 100 DEGREES EXPECTED OVER MOST AREAS THROUGH
FRIDAY.
- WARM LOWS IN THE LOW TO MID 70S THROUGH THURSDAY NIGHT WILL
PROVIDE LITTLE RELIEF FROM THE HEAT.
- SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE LIKELY EACH
DAY THROUGH THIS WEEKEND. STORMS MAY BECOME STRONG TO SEVERE
TODAY AND BE ACCOMPANIED WITH DAMAGING WINDS.
DISCUSSION
ISSUED AT 306 AM EDT WED JUN 25 2025
THE HEAT WAVE WILL CONTINUE THROUGH FRIDAY WITH HIGHS AROUND 90
OR IN THE LOWER 90S AND AFTERNOON HEAT INDICES GENERALLY
REACHING 100 DEGREES DURING THIS TIME. STORM COVERAGE YESTERDAY
WAS QUITE SMALL, BUT THE STORMS WERE ABLE TO PRODUCE COOL
OUTFLOWS THAT HAVE APPEARED TO HAVE BEEN ABLE TO HELP SOME WITH
SLIGHTLY COOLER TEMPERATURES AND SOMEWHAT LOWER HEAT INDICES AT
THE ONSET TODAY. IN COORDINATION WITH SURROUNDING OFFICES,
DECIDED TO ISSUE A HEAT ADVISORY FOR JUST OUR INDIANA AND OHIO
COUNTIES FOR TODAY. THERE IS A SIGNIFICANT CHANCE THE ENTIRE
FORECAST AREA WILL BE UNDER A HEAT ADVISORY THURSDAY AND FRIDAY.
CONCERN FOR THE MORE VULNERABLE POPULATIONS WITH THE START OF
THE 5TH DAY IN A ROW OF SIGNIFICANT HEAT. WILL CONTINUE TO
MESSAGE THESE CONCERNS.
AS FOR THUNDERSTORMS, STABLE MID LEVEL LAPSE RATES FROM 5.0 TO
5.5 C/KM AND WEAK WIND FLOW WILL CONTINUE TO BE LIMITING FACTORS
ON STORM DEVELOPMENT. EXPECT A REPEAT TODAY SIMILAR TO WHAT
HAPPENED WITH THE STORMS YESTERDAY: 1. DEVELOPMENT AFTER 16Z, 2.
SMALL IN SIZE, 3. LITTLE IF ANY MOVEMENT, 4. LOCALLY HEAVY
RAINFALL POTENTIAL, 5. BRIEF WIND GUSTS DURING DISSIPATION, 6
NOT SEVERE. THIS DIURNAL PATTERN WITH STORMS FROM BASICALLY 19Z
TO 01Z (3PM EDT TO 9PM EDT) SHOULD CONTINUE THROUGH SUNDAY.
AVIATION /12Z TAFS THROUGH 12Z THURSDAY/
ISSUED AT 615 AM EDT WED JUN 25 2025
NO SIGNIFICANT CHANGES TO THE TAFS WITH THIS UPDATE. SHOWERS ARE
DECAYING JUST NORTH OF KSBN. CEILINGS ARE GENERALLY VFR IN THE
VICINITY OF THIS ACTIVITY BUT FEW015 IS NOTED AT KVPZ AND
FEW009 AT KPPO HITS AT SOME LOWER CLOUDS. AFTERNOON
THUNDERSTORMS WILL PERHAPS IGNITE ON THIS SHOWER'S OUTFLOW
BOUNDARY. COVERAGE OF STORMS REMAINS A SOMEWHAT UNCERTAIN WITH A
NOTABLE DOWNTREND IN SOME CAMS EARLY THIS MORNING. AMID HOT,
SOUPY CONDITIONS AND WEAK IMPULSES RIDING ATOP OUR SOUTHEAST US
RIDGE, THE TEMPO GROUP REMAINS.
IWX WATCHES/WARNINGS/ADVISORIES
IN...HEAT ADVISORY FROM NOON EDT /11 AM CDT/ TODAY TO 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 FROM NOON TODAY TO 8 PM EDT THIS EVENING FOR
OHZ001-002-004-005-015-016-024-025.
MI...NONE.
MARINE...NONE.
DISCUSSION...SKIPPER
AVIATION...BROWN
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