584  
FXUS63 KLMK 310551  
AFDLMK  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LOUISVILLE KY  
151 AM EDT THU JUL 31 2025  
   
KEY MESSAGES  
 
* COLD FRONT WILL BRING SCATTERED SHOWERS/STORMS TOMORROW WITH A  
TRANSITION FROM HEAT AND HUMIDITY TO COOLER AND LESS HUMID WEATHER.  
 
* UNSEASONABLY COOL AND LESS HUMID AIR WILL BE IN PLACE FOR THE END  
OF THE WEEK AND INTO THE WEEKEND, SCATTERED SHOWERS/STORMS SUNDAY  
AFTERNOON.  
 
* LATE SUMMER TEMPERATURES AND HUMIDITY RETURN EARLY NEXT WEEK WITH  
AFTERNOON SHOWERS AND STORMS POSSIBLE EACH DAY.  
 
 
   
UPDATE  
 
ISSUED AT 759 PM EDT WED JUL 30 2025  
 
TEMPERATURES HAVE COOLED INTO THE UPPER 80S AT THIS HOUR AND HEAT  
INDICES HAVE DROPPED BELOW 100F. THE EXTREME HEAT WARNING AND THE  
HEAT ADVISORY HAVE BEEN ALLOWED TO EXPIRE. RELIEF FROM HOT AND HUMID  
TEMPERATURES IS ON THE WAY. THE COLD FRONT IS CURRENTLY LOCATED OVER  
CENTRAL INDIANA AND WILL ENTER SOUTHERN INDIANA BEFORE SUNRISE. THE  
CURRENT FORECAST IS ON TRACK.  
 
 
   
SHORT TERM /THROUGH FRIDAY/  
 
ISSUED AT 336 PM EDT WED JUL 30 2025  
 
AS WE GO THROUGH TONIGHT AND INTO TOMORROW WE WILL SEE A TRANSITION  
IN OUR WEATHER FROM THE LONG EXTENDED HEAT AND HUMIDITY TO SCATTERED  
SHOWERS AND STORMS THAT WILL EVENTUALLY LEAD TO MUCH COOLER AND  
DRIER AIR FOR THE END OF THE WEEK INTO THE WEEKEND.  
 
WHILE TEMPERATURES THIS AFTERNOON ARE WHERE WE EXPECTED THEM TODAY,  
CLIMBING INTO THE UPPER 80S/LOW 90S, THE DEWPOINTS HAVE BEEN A BIT  
DRIER THAN PREVIOUS DAYS WITH MAINLY LOW/MID 70S COMPARED TO THE MID  
TO UPPER 70S. THIS HAS RESULTED IN HEAT INDEX VALUES TO BE LOWER  
THAN EXPECTED, WITH VALUES AS OF 18Z-19Z BETWEEN 95-100. WITH THAT  
SAID, GIVEN HOW LONG WE'VE BEEN ENDURING THE HEAT AND THE ABUNDANT  
SUNSHINE, FOR NOW, WE WILL KEEP THE EXCESSIVE HEAT WARNING AND HEAT  
ADVISORIES IN PLACE UNTIL 00Z BUT IT IS POSSIBLE IT COULD BE ENDED  
BEFORE ITS SCHEDULED TIME.  
 
CONVECTIVE LINE OF SHOWERS AND STORMS CONTINUE TO WORK OUT OF THE  
MIDWEST AND INTO CENTRAL AND NORTHERN IN THIS AFTERNOON AHEAD OF AN  
APPROACHING COLD FRONT THAT WILL SIGNAL SIGNIFICANT WEATHER CHANGES  
FOR US OVER THE NEXT COUPLE OF DAYS. WHILE MOST OF THE EXPECTED  
SHOWER/STORM ACTIVITY IS EXPECTED TO STAY NORTH INTO CENTRAL IN THIS  
AFTERNOON AND EVENING, ASSOCIATED OUTFLOW FROM THIS SYSTEM AND ANY  
CONVECTION THAT MAY FORM ACROSS CENTRAL IN LATER TONIGHT COULD SPARK  
SOME SHOWERS AND STORMS ACROSS OUR NORTHERN COUNTIES ACROSS SOUTHERN  
IN. KEPT SLIGHT CHANCES IN THAT AREA THIS EVENING. THE REST OF THE  
AREA SHOULD REMAIN MOSTLY CLEAR AND MUGGY WITH LIGHT WINDS. THERE  
COULD BE MORE PATCHY FOG AS WE HAVE SEEN THE LAST COUPLE OF  
MORNINGS.  
 
COLD FRONT WILL START TO DROP INTO THE AREA FROM THE NORTH DURING  
THE MORNING HOURS AND SLOWLY PUSH SOUTH THROUGH CENTRAL KY DURING  
THE DAY. MODELS HAVE TRENDED DRIER ON THE SOLUTION WITH JUST  
SCATTERED SHOWERS AND STORMS ALONG THE BOUNDARY WITH BETTER  
INITIATION DEVELOPING ALONG AND SOUTH OF THE PARKWAYS TOMORROW  
AFTERNOON AS THE BOUNDARY INTERACTS WITH GOOD AMOUNT OF INSTABILITY  
THANKS TO PEAK HEATING AND HIGH DEWPOINT VALUES. STORMS COULD HAVE  
GUSTY WINDS, HEAVY TORRENTIAL RAINFALL AND LIGHTNING BUT THE THREAT  
OF SEVERE REMAINS LOW. A NORTH/SOUTH TEMPERATURES GRADIENT WILL BE  
IN PLACE ACROSS THE CWA TOMORROW WITH LOW 90S ALONG AND SOUTH OF THE  
PARKWAYS WITH MID/UPPER 80S ALONG THE OHIO RIVER INTO SOUTHERN IN.  
 
 
   
LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/  
 
ISSUED AT 336 PM EDT WED JUL 30 2025  
 
FRIDAY INTO THE WEEKEND WILL FEATURE A MUCH NEEDED BREAK FROM THE  
HEAT AND HUMIDITY OF THE PAST SEVERAL DAYS. COLD FRONT WILL BE SOUTH  
OF THE TENNESSEE VALLEY BY FRIDAY AS DEWPOINTS GO FROM THE LOW 70S  
THURSDAY NIGHT TO THE LOW/MID 60S BY FRIDAY MORNING. DEPENDING ON  
HOW FAR SOUTH THE BOUNDARY GETS ON FRIDAY, A FEW SCATTERED SHOWERS  
AND STORMS ARE POSSIBLE FRIDAY AFTERNOON, MAINLY ALONG THE TN/KY  
BORDER, LAKE CUMBERLAND REGION AND STRETCHING UP THE I-75 CORRIDOR  
INTO THE BLUEGRASS. HIGHS WILL ALSO BE NOTICEABLY COOLER ONLY WARMING  
INTO THE LOW 80S AND NORTHERLY WINDS.  
 
HIGH PRESSURE WILL BUILD IN OVER THE GREAT LAKES FOR THE WEEKEND.  
COOLER AND LESS HUMID WEATHER WILL BE THE THEME THROUGH THE WEEKEND  
WITH HIGHS ON SATURDAY IN THE LOW/MID 80S AND MORNING LOWS AN ALMOST  
CHILLY LOW 60S TO EVEN A FEW UPPER 50S IN SOUTHERN IN. SLIGHTLY  
WARMER TEMPERATURES AND DEWPOINTS FOR SUNDAY BUT STILL COMPARED TO  
THE LAST SEVERAL DAYS IT WILL FEEL VERY COMFORTABLE WITH HIGHS IN  
THE MID 80S, AND DEWPOINTS CREEPING UP INTO THE MID/UPPER 60S. WHILE  
HIGH PRESSURE WILL BE IN CONTROL FOR THE WEEKEND AN INVERTED SURFACE  
TROUGH WILL WORK ACROSS SOUTHERN KY DURING THE DAY WITH INCREASED  
SCATTERED SHOWERS AND THUNDERSTORMS THAT WILL BE DIURNALLY DRIVEN.  
 
AS THE SFC HIGH PRESSURE DRIFTS EASTWARD TO START THE NEW WEEK,  
INCREASED MOISTURE FROM THE SOUTH WILL BUILD IN FROM THE SOUTH.  
RIDGING TO OUR WEST WILL START TO BUILD OVER THE FOUR CORNERS REGION  
INCREASING HEIGHTS. THIS WILL BRING SEASONABLY WARM AND HUMID LATE  
SUMMER WEATHER BACK TO THE AREA FOR THE MIDDLE OF THE WEEK. UPPER  
80S TO NEAR 90 WILL RETURN AND AS A FEW EMBEDDED MID-LEVEL FEATURES  
WORK ALONG THE PERIPHERAL OF THE WESTERN RIDGE, WE WILL SEE  
SCATTERED AFTERNOON SHOWERS AND STORMS EACH DAY THROUGH THE FIRST  
HALF OF THE WEEK.  
 
 
   
AVIATION /06Z TAFS THROUGH 12Z FRIDAY/  
 
ISSUED AT 151 AM EDT THU JUL 31 2025  
 
MAIN QUESTION IN THIS TAF SET IS OVERNIGHT FOG, WITH CLEAR SKIES AND  
LIGHT WINDS IN PLACE ACROSS THE OHIO VALLEY. BASED ON TEMP/DEWPOINT  
TRENDS, BWG ACTUALLY LOOKS LESS FAVORABLE FOR FOG, SO LIMITED THE  
MENTION TO A TEMPO MVFR THERE, WHILE WE DID INCLUDE A BRIEF PERIOD  
OF PREVAILING MVFR AT LEX. EXPECT SDF TO REMAIN VFR FOR THE  
DURATION.  
 
COLD FRONT MAKES ITS WAY SE ACROSS THE AREA DURING THE DAYTIME, WITH  
THE MAIN SENSIBLE WX BEING JUST A WIND SHIFT AS THE WARM SECTOR IS A  
BIT CAPPED. STRONG HIGH PRESSURE TO OUR NORTH WILL PRODUCE A MARKED  
WIND SHIFT TO NEARLY SURE NORTH, WITH A SOLID 10 KT IN THE LATE  
AFTERNOON AND EVENING. COULD EVEN SEE SOME GUSTS PUSHING 20 KT IN  
THIS NORTHERLY SURGE. ALSO CARRIED PROB30 FOR SHRA IN THIS TIME  
PERIOD AS WELL, BUT NOT MENTIONING MUCH IN THE WAY OF STORM  
INTENSITY. HIGHLY CONFIDENT IN MVFR CIGS DURING THE EVENING AND AT  
LEAST MODERATE CONFIDENCE THAT WE'LL DROP BELOW 2000 FEET.  
 
 
   
LMK WATCHES/WARNINGS/ADVISORIES  
 
KY...NONE.  
IN...NONE.  
 
 
 
 
 
UPDATE...SRW  
SHORT TERM...BTN  
LONG TERM...BTN  
AVIATION...RAS  
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