340
FXUS63 KIND 090658
AFDIND
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
258 AM EDT TUE SEP 9 2025
KEY MESSAGES
- GRADUALLY CLIMBING TEMPERATURES THROUGH THE WEEK WITH NEAR 90
DEGREE HIGHS BY SATURDAY
- DRY WEATHER OUTSIDE OF LOW RAIN CHANCES THIS WEEKEND MAY LEAD TO
CONTINUED EXPANSION OF DROUGHT CONDITIONS INTO NEXT WEEK
SHORT TERM (TODAY AND TONIGHT)
ISSUED AT 255 AM EDT TUE SEP 9 2025
SURFACE HIGH PRESSURE REMAINS NEAR THE REGION PROVIDING CONTINUED
QUIET WEATHER CONDITIONS. THE CENTER OF THE SURFACE HIGH PRESSURE
WILL BE OVER NEW ENGLAND TODAY, SHIFTING NORTHEAST THROUGHOUT THE
SHORT TERM PERIOD. THIS WILL ALLOW FOR WINDS TO BECOME MORE
SOUTHEASTERLY AND THUS BEGIN THE TREND OF WARMING TEMPERATURES
EXPECTED LATER IN THE WEEK. THE LIGHT SOUTHEASTERLY FLOW AND
PLENTIFUL SUNSHINE SHOULD WARM TEMPERATURES WELL INTO THE UPPER 70S
TODAY WITH SOME LOCATIONS POTENTIALLY REACHING OR EXCEEDING THE 80F
MARK.
FORECAST SOUNDINGS SHOW DEEP MIXING INTO A DRY AIRMASS ALOFT WHICH
WILL RESULT IN LOW RH VALUES DURING THE AFTERNOON. FIRE CONCERNS
REMAIN LOW DUE TO LIGHT WINDS. A SUBTLE UPPER WAVE IS EXPECTED TO
APPROACH CENTRAL INDIANA LATE IN THE DAY AND INTO TONIGHT. WHILE THE
AIRMASS WILL BE MUCH TOO DRY FOR PRECIPITATION, SOME INCREASE IN MID-
HIGH CLOUDS CAN BE EXPECTED AS WELL AS DEW POINTS INCREASING BY A
FEW DEGREES. MODEL SOUNDINGS ALSO SHOW THE COLUMN BECOMING LESS DRY
AS THE WAVE APPROACHES.
EXPECT TEMPERATURES TO QUICKLY FALL AFTER SUNSET DUE TO A DECENTLY
FAVORABLE SETUP FOR RADIATIONAL COOLING, ALTHOUGH NOT QUITE AS
EFFICIENT AS THE PREVIOUS FEW NIGHTS. LOOK FOR LOWS GENERALLY IN THE
LOW 50S TONIGHT.
LONG TERM (WEDNESDAY THROUGH MONDAY)
ISSUED AT 255 AM EDT TUE SEP 9 2025
WEDNESDAY THROUGH FRIDAY.
THE GRADUAL WARMING TREND WILL CONTINUE INTO WEDNESDAY WITH BROAD
HIGH PRESSURE ACROSS THE OHIO VALLEY PERSISTING AND WEAK TO NO FLOW
NEAR THE SURFACE AND ALOFT. MODEL SOUNDINGS SHOW NEAR SATURATION AT
THE TOP OF THE BOUNDARY LAYER WEDNESDAY AFTERNOON WHICH SHOULD ALLOW
FOR A SPARSE DIURNAL CU FIELD. WEAK FLOW AT THE TOP OF THE BOUNDARY
LAYER WILL LIMIT THE MIXING OUT OF SURFACE MOISTURE BUT LIKE
PREVIOUS DAYS, EXPECT MIN RH VALUES TO DROP INTO THE 25 TO 35
PERCENT RANGE. AFTERNOON HIGHS SHOULD TOP OUT IN THE LOW TO MID 80S
WEDNESDAY. NEAR IDENTICAL CONDITIONS ERE EXPECTED FOR THURSDAY WITH
SLIGHTLY LOWER RH VALUES FRIDAY DUE TO THE WARMER HIGHS WHICH MAY
APPROACH 90 DEGREES IN THE WEST. CONCERNS CONTINUE FOR SLIGHTLY
ELEVATED FIRE WEATHER DANGER WITH DETAILS COVERED IN THE FIRE
SECTION AT THE BOTTOM.
SATURDAY THROUGH MONDAY.
FORECAST CONFIDENCE IS LOW THIS WEEKEND INTO NEXT WEEK WITH A WIDE
MODEL SPREAD ON THE SYNOPTIC PATTERN. THE BROADER PATTERN HAS A
BUILDING RIDGE ACROSS THE CENTRAL US WITH THE POTENTIAL FOR RIDGE-
RIDING COMPLEXES OF STORMS FOR THE WEEKEND, BUT EXACT DETAILS REMAIN
HIGHLY UNCERTAIN. WHILE THERE WILL BE SOME MOISTURE RETURN INTO THE
OHIO VALLEY BY SATURDAY, INSTABILITY VALUES WILL BE FAIRLY MEAGER,
BUT A STRENGTHENING JET ACROSS THE UPPER MIDWEST WILL INCREASE SHEAR
AND CREATE A FAVORABLE ENVIRONMENT FOR THUNDERSTORM ORGANIZATION. AT
THIS POINT, CONFIDENCE IS FAIRLY HIGH IN AT LEAST SOME THUNDERSTORMS
ACROSS THE GREAT LAKES REGION, BUT CONFIDENCE IS LOW THAT ANY REACH
AS FAR SOUTH AS CENTRAL INDIANA.
FORECAST CONFIDENCE CONTINUES TO DECREASE SUNDAY INTO MONDAY WITH A
WIDE RANGE OF MODEL SOLUTIONS IN HOW THEY HANDLE BOTH THE ONGOING
RIDGE AND A DEEPENING UPPER LEVEL LOW ACROSS SOUTHERN CANADA.
CURRENTLY LEANING TOWARDS A MORE PERSISTENT PATTERN WITH THE UPPER
LEVEL RIDGE HELPING TO PUSH THE AFOREMENTIONED LOW PRESSURE FURTHER
EAST INTO THE NORTHEASTERN STATES, BUT WILL HAVE TO CONTINUE TO
MONITOR FORECAST TRENDS. WITH ENSEMBLE OUTPUT KEEPING CHANCES OF QPF
GREATER THAN 0.01" AT LESS THAN 30 PERCENT OVER THE NEXT 7 DAYS,
EXPECT TO SEE FURTHER EXPANSION IN DROUGHT CONDITIONS AND
EXACERBATING FIRE WEATHER CONCERNS GOING INTO THE SECOND HALF OF THE
MONTH.
AVIATION (06Z TAF ISSUANCE)
ISSUED AT 130 AM EDT TUE SEP 9 2025
IMPACTS:
- NONE.
DISCUSSION:
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD.
SOME CIRRUS WILL PASS THROUGH AT TIMES, AND PERHAPS A FEW CUMULUS
MAY POP DURING THE AFTERNOON. WINDS WILL BE LIGHT AND VARIABLE INTO
THE MORNING AND CALM AT TIMES, BUT WITH GENERALLY EASTERLY
DIRECTION. WINDS WILL SHIFT TO THE SOUTHEAST 10KT OR LESS BY TUESDAY
MIDMORNING AND PERSISTING THROUGH MUCH OF THE DAY. DRY AIR SHOULD
KEEP ANY FOG AT BAY OVERNIGHT.
IND WATCHES/WARNINGS/ADVISORIES
NONE.
SHORT TERM...KF
LONG TERM...WHITE
AVIATION...KF
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