300  
FXUS63 KIWX 271725  
AFDIWX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NORTHERN INDIANA  
125 PM EDT FRI JUN 27 2025  
   
KEY MESSAGES  
 
- HEAT ADVISORY THIS AFTERNOON FOR HEAT INDICES APPROACHING 100  
DEGREES. AFTERNOON CONVECTION AND CLOUDS COULD LIMIT OVERALL  
DURATION OF IMPACTS.  
 
- SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS (60-80%)  
TODAY, WITH A MARGINAL RISK FOR STRONG TO SEVERE WIND GUSTS.  
 
- MORE SEASONABLE TEMPERATURES AND LOWER HUMIDITY VALUES  
EXPECTED TUESDAY AND BEYOND.  
 
 
   
DISCUSSION  
 
ISSUED AT 1221 PM EDT FRI JUN 27 2025  
 
A WEAKENING COLD FRONT WILL EVENTUALLY CONTINUE TO WORK ITS WAY  
THROUGH THE AREA TODAY. ADDITIONAL SHOWERS AND THUNDERSTORMS  
WILL BE EXPECTED (60-80% CHANCE) AS THIS FRONT MOVES THROUGH THE  
AREA. IN THE WARM SECTOR, SIMILAR ATMOSPHERIC CONDITIONS (AS  
FAR AS CAPE/SHEAR GOES) WILL BE IN PLACE ACROSS THE WARM SECTOR  
TODAY LIKE WE SAW YESTERDAY. FORCING ALONG AND AHEAD OF THE  
FRONT AS IT MOVES THROUGH WILL BE THE FOCUS FOR STORMS, HOWEVER,  
LIKE WE SAW YESTERDAY BUBBLY CONVECTION MIGHT GET GOING AT ANY  
TIME ONCE CONVECTIVE TEMPERATURES ARE REACHED. VISIBLE  
SATELLITE IMAGERY AS OF 1145AM ALREADY SUGGESTS CU FIELD IS  
DEVELOPING ACROSS THE SE HALF OF THE FORECAST AREA. STRONG/GUSTY  
WINDS, HEAVY RAIN, AND FREQUENT LIGHTNING WILL CONTINUE TO BE  
THE MAIN THREATS - ALTHOUGH LIKE WE SAW YESTERDAY SOME SMALL  
HAIL CAN'T BE RULED OUT WITH THE MORE ROBUST UPDRAFTS. WITH  
LARGE LOW-LEVEL LAPSE RATES AND ELEVATED DCAPE VALUES, LOCALIZED  
STRONG TO SEVERE WIND GUSTS WILL BE THE MAIN ISSUE. BY  
SATURDAY, TEMPERATURES WILL HAVE "COOLED" DOWN SLIGHTLY INTO THE  
LOW-MID 80S. RAIN CHANCES ACROSS THE SOUTHERN PORTION OF THE  
CWA HAS BACKED OFF A BIT, SO WE MAY HAVE A RELATIVELY DRY  
SATURDAY AFTER ALL.  
 
WARMER TEMPERATURES RETURN SUNDAY. 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, ESPECIALLY AFTER  
ANOTHER FRONT MOVES THROUGH THE AREA ON MONDAY. THE ASSOCIATED  
SHORTWAVE WILL BRING WIDESPREAD RAINFALL TO THE REGION ON  
MONDAY. HOPEFULLY THE RETURN OF DEWPOINTS BACK IN THE 60S  
COMPARED TO THE 70S WE'VE BEEN EXPERIENCING WILL BE A WELCOME  
RELIEF.  
 
 
   
AVIATION /18Z TAFS THROUGH 18Z SATURDAY/  
 
ISSUED AT 125 PM EDT FRI JUN 27 2025  
 
TSTMS HAVE BEGUN TO FIRE ALONG AND AHEAD OF AN APPROACHING  
FRONTAL BOUNDARY THIS AFTN. THE ATMOSPHERE WHILE LACKING IN  
MIDLEVEL LAPSE RATES, HAS PLENTY OF MOISTURE COUPLED WITH  
HEATING TO CREATE ELEVATED CAPE VALUES. THE MAIN TARGET PERIOD  
FOR KSBN WILL BE THE AFTN HOURS WHILE AT KFWA WILL BE MID AFTN  
INTO THE EVENING HOURS. WINDS WILL TURN WESTERLY POST FRONTAL  
AND EVENTUALLY NORTHWEST AROUND 08Z.  
 
 
   
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...MF  
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