105
FXUS63 KIWX 250757
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
357 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 /06Z TAFS THROUGH 06Z THURSDAY/
ISSUED AT 130 AM EDT WED JUN 25 2025
TRANQUIL CONDITIONS ARE ANTICIPATED DURING THE CRITICAL TAF
PERIOD AS SHOWERS HAVE SO FAR FAILED TO MARCH EASTWARD INTO
NORTHWEST IN. THIS IS LIKELY DUE TO AN OVERWORKED ATMOSPHERE
FROM EARLIER STORMS. HOWEVER, SHOWERS CONTINUE TO PERCOLATE
ACROSS THE STATELINE AND THESE WILL NEED TO BE MONITORED FOR
ANY POSSIBLE IMPACTS TO KSBN. FOR NOW, THESE ARE MOVING NNE VERY
SLOWLY AND IN THE ABSENCE OF ANY NOTABLE UPPER-LEVEL SUPPORT.
DIURNALLY-DRIVEN STORMS ARE ANTICIPATED THIS AFTERNOON AT BOTH
TAF SITES; GREATER CONFIDENCE AND COVERAGE AT KFWA TODAY THAN
TUESDAY WITH A RIDGE COLLAPSING SOMEWHAT. WIND LESS THAN 10
KNOTS OUTSIDE OF ANY THUNDERSTORM OUTFLOWS.
IWX WATCHES/WARNINGS/ADVISORIES
IN...NONE.
OH...NONE.
MI...NONE.
MARINE...NONE.
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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