197  
FXUS63 KIND 060149  
AFDIND  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE INDIANAPOLIS IN  
949 PM EDT FRI SEP 5 2025  
   
KEY MESSAGES  
 
- ISOLATED TO SCATTERED VERY LIGHT SHOWERS OVER THE SOUTHEAST HALF  
OF CENTRAL INDIANA TONIGHT AND EARLY SATURDAY  
 
- DRY AND COOLER THROUGH EARLY NEXT WEEK WITH MULTIPLE NIGHTS WITH  
LOWS IN THE 40S  
 
- SLOW WARMING TREND BACK TO THE 80S BY LATER NEXT WEEK  
 
- BEYOND EARLY SATURDAY, NO CHANCE FOR RAIN ACROSS CENTRAL INDIANA  
THROUGH THE END OF NEXT WEEK  
 
 
   
FORECAST UPDATE  
 
ISSUED AT 948 PM EDT FRI SEP 5 2025  
 
ONE AREA OF FORCING THAT BROUGHT SCATTERED SPRINKLES/VERY LIGHT  
SHOWERS HAS MOVED INTO THE EASTERN FORECAST AREA, WHILE THE NEXT  
AREA OF SIMILAR PRECIPITATION IS APPROACHING FROM SOUTHERN ILLINOIS.  
HAVE ADJUSTED HOURLY POPS FOR THE NEXT FEW HOURS TO REFLECT THIS.  
 
A BIT BETTER FORCING WILL ARRIVE OVERNIGHT, MAINLY SOUTH, WITH SOME  
WEAK ISENTROPIC LIFT. KEPT THE LOW CHANCE POPS FAR SOUTH WITH SLIGHT  
CHANCE POPS ACROSS AREAS MAINLY NEAR AND SOUTH OF I-70.  
 
SKIES WILL REMAIN MOSTLY CLOUDY TO CLOUDY UNTIL LATE TONIGHT, WHEN  
SOME PARTIAL CLEARING WILL WORK IN FROM THE NORTHWEST. NUDGED DOWN  
LOW TEMPERATURES A BIT WHERE THIS PARTIAL CLEARING WILL OCCUR.  
 
 
   
SHORT TERM (THIS EVENING THROUGH SATURDAY)  
 
ISSUED AT 223 PM EDT FRI SEP 5 2025  
 
CENTRAL INDIANA IS ENJOYING A BREEZY BUT COMFORTABLE FRIDAY  
AFTERNOON IN THE WAKE OF A COLD FRONT THAT PASSED THROUGH THE  
FORECAST AREA THIS MORNING. A SMOKY HAZE COURTESY OF THE FIRES IN  
THE PACIFIC NORTHWEST REMAINS ACROSS MUCH OF THE AREA ALTHOUGH  
VISIBLE SATELLITE DOES SHOW THE AXIS OF SMOKE GRADUALLY SINKING  
SOUTHEAST. HIGH CLOUDS INCREASE JUST TO OUR WEST ASSOCIATED WITH AN  
UPPER LEVEL WAVE OVER KANSAS AND OKLAHOMA. 18Z TEMPERATURES RANGED  
FROM THE UPPER 60S TO MID 70S.  
 
THE AFOREMENTIONED FRONT IS ALREADY IN THE PROCESS OF CLEARING THE  
OHIO RIVER AND AS THE UPPER LEVEL ENERGY TO THE WEST CATCHES UP TO  
IT LATER TODAY INTO THIS EVENING...EXPECT CONVECTION TO DEVELOP FROM  
THE TENNESSEE VALLEY NORTHEAST INTO THE CENTRAL APPALACHIANS  
CONTINUING INTO THE OVERNIGHT. MOISTURE ALOFT HOWEVER WILL EXPAND  
NORTH INTO THE OHIO VALLEY AND DESPITE THE PRESENCE OF DRY AIR BELOW  
750MB...MAY HAVE JUST ENOUGH LIFT TO SQUEEZE OUT A FEW HUNDREDTHS  
FROM VERY LIGHT SHOWERS TONIGHT. DRIER AND COOLER WEATHER THEN TAKES  
HOLD ON SATURDAY AND WILL CONTINUE THROUGH THE WEEKEND WITH A DEEP  
UPPER LEVEL LOW LOCATED NEAR JAMES BAY.  
 
EXPECT A SLOW INCREASE IN MID AND HIGH CLOUDS FROM THE WEST INTO THE  
EVENING BUT HAVE LARGELY REMOVED ANY MENTION OF RAIN PRIOR TO CLOSER  
TO SUNSET AND BEYOND WITH DRIER AIR THROUGH THE BOUNDARY LAYER  
QUICKLY ADVECTING SOUTH ACROSS THE FORECAST AREA IN THE POSTFRONTAL  
AIRMASS. THE BEST CHANCE TO SEE ANY RAINDROPS WILL COME FROM MID  
EVENING INTO THE OVERNIGHT AND FOCUS ACROSS THE SOUTHEAST HALF OF  
CENTRAL INDIANA AS DEEPER MOISTURE NOTED AT THE 300K LEVEL SPREADS  
INTO THE REGION. ISENTROPIC LIFT HOWEVER IS MUTED WITH A LARGELY  
PARALLEL FLOW TO THE MOISTURE AXIS. THIS LACK OF SUBSTANTIAL LIFT  
AND THE DRIER AIR REMAINING BELOW ABOUT 8KFT NOTED NICELY ON MODEL  
SOUNDINGS ARGUES FOR LIGHT SHOWERS OR SPRINKLES IN AN ISOLATED TO  
SCATTERED FASHION THAT WILL BE HARD PRESSED TO GENERATE ANYTHING  
MORE THAN A FEW HUNDREDTHS FOCUSED MAINLY ALONG THE FAR SOUTHERN  
BORDER OF THE FORECAST AREA. ANY CHANCE TO SEE RAINDROPS WILL DROP  
OFF RAPIDLY TO THE NORTHWEST WITH A DEEPER COLUMN OF DRIER AIR AND  
INCREASING SUBSIDENCE SPREADING SOUTHEAST.  
 
A FEW SPRINKLES OR LIGHT SHOWERS MAY LINGER OVER SOUTHEAST INDIANA  
SATURDAY MORNING BUT THE TREND WILL BE TOWARDS CLEARING SKIES AS  
DRIER AIR ADVECTS INTO THE REGION. A TRAILING SUBTLE WAVE ALOFT MAY  
BE ENOUGH TO GENERATE SCATTERED DIURNAL CU FOR THE AFTERNOON  
OTHERWISE EXPECT PLENTY OF SUNSHINE.  
 
TEMPS...LOWS WILL HOLD IN THE LOW AND MID 50S ACROSS THE SOUTHEAST  
HALF OF THE FORECAST AREA WITH MOSTLY CLOUDY SKIES FOR MUCH OF THE  
NIGHT. ACROSS THE NORTHERN WABASH VALLEY AND NORTH CENTRAL INDIANA  
WHERE SKIES WILL CLEAR LATE TONIGHT...LOWS WILL DROP INTO THE UPPER  
40S. LOW LEVEL THERMALS SUPPORT HIGHS GENERALLY IN THE UPPER 60S AND  
LOWER 70S FOR SATURDAY.  
 
 
   
LONG TERM (SATURDAY NIGHT THROUGH FRIDAY)  
 
ISSUED AT 223 PM EDT FRI SEP 5 2025  
 
A DEEP UPPER LEVEL TROUGH CENTERED NEAR JAMES BAY WILL BRING AN  
EARLY TASTE OF FALL TO THE REGION FOR THE WEEKEND WITH UNSEASONABLY  
COOL AIR AND THE COOLEST MORNINGS FOR CENTRAL INDIANA SINCE MAY. THE  
TROUGH WILL MOVE AWAY TO THE EAST BEING REPLACED BY MORE ZONAL FLOW  
ALOFT BY MONDAY AND TUESDAY...TRANSITIONING FURTHER TO UPPER RIDGING  
BY LATE NEXT WEEK WITH GROWING CONFIDENCE IN A RETURN TO SUMMER LIKE  
WEATHER IN THE 7 TO 14 DAY PERIOD.  
 
AS MENTIONED ABOVE...THE UPPER TROUGH TO OUR NORTHEAST WILL GOVERN  
THE WEATHER ACROSS THE MIDWEST AND OHIO VALLEY THROUGH THE WEEKEND.  
HIGH PRESSURE OVER THE CANADIAN PRAIRIES WILL STRETCH SOUTHEAST INTO  
THE MIDWEST KEEPING NORTHWESTERLY FLOW THROUGH INDIANA. TROUGHING  
OVERHEAD RESULTS IN A MUCH COOLER CANADIAN AIRMASS ALOFT WITH WELL  
BELOW NORMAL HEIGHTS AND TEMPERATURE ANOMALIES. DESPITE SUNNY SKIES  
THIS WEEKEND...BELOW AVERAGE TEMPERATURES THROUGH THE COLUMN WILL  
ONLY SUPPORT HIGHS IN THE UPPER 60S ACROSS THE NORTH TO LOW TO MID  
70S FURTHER SOUTH. THE MAIN FOCUS FOR THIS WEEKEND WILL BE CHILLY  
OVERNIGHT LOWS ONCE AGAIN SUNDAY AND MONDAY MORNING AS GOOD  
CONDITIONS FOR RADIATIONAL COOLING AND A COLD AIRMASS ALOFT SUPPORT  
LOW TO MID 40S. THE COOLEST LOCATIONS WILL BE ACROSS THE WABASH  
RIVER VALLEY AND IN NORTH CENTRAL INDIANA WHERE A FEW OF OUR NORMAL  
COOL SPOTS MAY SLIP AS LOW AS THE UPPER 30S...ESPECIALLY ON MONDAY  
MORNING.  
 
THE OVERALL PATTERN BEGINS TO SHIFT AS NEXT WEEK PROGRESSES...  
LEADING TO A SLOW WARMING TREND BACK TO THE 80S BUT WITH DRY WEATHER  
PERSISTING. THE AFOREMENTIONED UPPER TROUGH MOVES AWAY TO THE  
NORTHEAST WITH INCREASING HEIGHTS TOWARD SEASONAL NORMS BY MONDAY.  
SURFACE HIGH PRESSURE BRIEFLY MOVES OVERHEAD EARLY NEXT WEEK THEN  
MOVES OFF TO THE EAST ENABLING A RETURN FLOW TO DEVELOP ACROSS THE  
OHIO VALLEY AND ADVECTING WARMER AIR NORTHWARD. UPPER LEVEL HEIGHT  
INCREASES AND SLOWLY WARMING 850MB TEMPS INDICATE A PATTERN  
FAVORABLE FOR A WARMING TREND THROUGH THE WEEK WITH HIGHS REACHING  
THE UPPER 70S TO MID 80S TUESDAY THROUGH FRIDAY. DRY CONDITIONS WILL  
STILL LEAD TO LARGER DIURNAL RANGES AS TEMPERATURES QUICKLY FALL  
AFTER SUNSET...WITH LOWS IN THE UPPER 40S TO LOW 50S TUESDAY THEN  
INCREASING TO THE MID TO UPPER 50S BY LATE IN THE WEEK.  
 
FORECAST CONFIDENCE SOMEWHAT DECREASES TOWARD THE END OF THE PERIOD  
AS LONGER RANGE GUIDANCE AND ENSEMBLES STRUGGLE TO RESOLVE HOW THIS  
PATTERN EVOLVES AS WEAK STORM SYSTEMS APPROACH FROM THE WEST. FOR  
NOW HIGHER CONFIDENCE EXISTS IN A WARM AND DRY FORECAST CONTINUING  
INTO NEXT WEEKEND INTO THE FOLLOWING WEEK WITH DAYTIME HIGHS  
CONSISTENTLY IN THE MID AND UPPER 80S.  
 
 
   
AVIATION (00Z TAF ISSUANCE)  
 
ISSUED AT 635 PM EDT FRI SEP 5 2025  
 
IMPACTS:  
 
- WIND GUSTS OF 15-20KT POSSIBLE SATURDAY AFTERNOON  
 
DISCUSSION:  
 
VFR CONDITIONS ARE EXPECTED THROUGH THE PERIOD.  
 
MID-LEVEL CLOUDS WILL MOVE IN TO MOST SITES THIS EVENING AND PERSIST  
OVERNIGHT BEFORE CLEARING FROM THE NORTHWEST. SCATTERED VFR CUMULUS  
WILL POP UP SATURDAY, ESPECIALLY FOR KLAF/KIND.  
 
SOME SPRINKLES/LIGHT RAIN SHOWERS WITH NO IMPACTS ARE POSSIBLE AT  
ALL BUT KLAF TONIGHT, WITH KBMG HAVING THE HIGHEST CHANCE FOR A  
SHOWER.  
 
 
   
IND WATCHES/WARNINGS/ADVISORIES  
 
NONE.  
 
 
 
 
UPDATE...50  
SHORT TERM...RYAN  
LONG TERM...RYAN  
AVIATION...50  
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