429
FXUS63 KIWX 302328
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
728 PM EDT WED SEP 30 2026
KEY MESSAGES
- SHOWERS WILL PERSIST ACROSS MUCH OF THE AREA INTO THIS
EVENING, BEFORE WEAKENING. GREATEST CHANCES (40-80%) WILL
REMAIN NORTHWEST OF US-69.
- WINDOW OF DRY WEATHER LIKELY LATE TONIGHT INTO THURSDAY
MORNING. CHANCES FOR SHOWERS (50-90%) AND AN ISOLATED
THUNDERSTORMS RETURN THURSDAY AFTERNOON INTO THURSDAY NIGHT.
LOCALLY HEAVY RAIN IS POSSIBLE, BUT OVERALL FLOOD CONCERNS
APPEAR LOW AT THIS TIME.
- DRY CONDITIONS ARE EXPECTED THIS WEEKEND INTO EARLY NEXT
WEEK, WITH HIGHS IN THE 60S, LOW 70S (WARMEST FURTHER SOUTH).
OVERNIGHT LOWS WILL DROP INTO THE 40S.
DISCUSSION
ISSUED AT 204 PM EDT WED SEP 30 2026
AREA OF WEAK ISENTROPIC LIFT CONTINUES ADVANCE ACROSS THE AREA,
WITH LIGHT RETURNS (PRIMARILY SPRINKLES OR T AMOUNTS OF PRECIP)
EXTENDING EAST TO THE I-69 CORRIDOR. STEADIER RAIN HAS REMAINED
IN NW PARTS OF THE AREA SO FAR. MODELS HAVE BEEN SHOWING A
WEAKENING TREND OVER THE PAST SEVERAL RUNS, BUT GIVEN CURRENT
AND UPSTREAM RADAR RETURNS THIS SEEMS SOMEWHAT UNREALISTIC FOR
AT LEAST THE NEXT SEVERAL HOURS. POPS HAVE BEEN CONTINUED INTO
EARLY EVENING WITH A SLOW TAPER FROM SOUTHWEST TO NORTHEAST INTO
THE OVERNIGHT HOURS. SIGNS STILL SEEM TO POINT TOWARDS A SMALL
LULL IN PRECIP LATE TONIGHT THROUGH AT LEAST THURSDAY MORNING.
A CLOSED UPPER LOW, CURRENTLY OVER THE FOUR CORNERS AREA, WILL FIGHT
TO WORK EAST AND EVENTUALLY NORTHEAST ALONG THE STUBBORN SE US
RIDGE. A WEAKER NORTHERN STREAM TROUGH WILL DIVE IN AS WELL. THE
SOUTHERN STREAM WAVE WILL FILL AND WEAKEN WITH NE EXTENT AS IT IS
ABSORBED INTO THE NORTHERN STREAM TROUGH. PWATS WILL STEADILY
INCREASE THROUGH THE DAY THURSDAY, PEAKING IN THE 1.75" TO LOCALLY
2" RANGE DURING THE AFTERNOON AND EVENING HOURS AHEAD OF AN EASTWARD
PROGRESSING FRONT. MODELS INDICATE SOME WEAK SURFACE CYCLOGENESIS
THAT RIDES ALONG THE FRONT MAINLY THURSDAY NIGHT. ALL THESE FACTORS
SHOULD LEAD TO THE BEST CHANCES FOR MEASURABLE RAINFALL WITH AVERAGE
AMOUNTS OF A HALF TO ONE INCH. A LOW CHANCE EXISTS FOR THUNDERSTORMS
EMBEDDED WITHIN THE AREA THAT COULD AID IN LOCALLY HIGHER RAINFALL
AMOUNTS, BUT AT THIS POINT EXPECTED RAINFALL SHOULD NOT CAUSE
SIGNIFICANT IMPACTS TO WATER LEVELS ACROSS THE AREA.
DRIER AIR QUICKLY WORKS IN FROM THE NORTH FRIDAY AS THE OVERALL
UPPER FLOW BECOMES SEMI-ZONAL AND DEEPER MOISTURE IS PUSHED WELL
SOUTH. TEMPERATURES THIS WEEKEND INTO NEXT WEEK WILL SETTLE BACK INTO
THE 60S FOR HIGHS AND LOWS IN THE 40S WITH A HINT OF SOME UPPER 30S
POSSIBLY COMING FOR TUESDAY MORNING.
AVIATION /00Z TAFS THROUGH 00Z FRIDAY/
ISSUED AT 728 PM EDT WED SEP 30 2026
ELEVATED WARM/MOIST AIR ADVECTION INTO A MODEST FRONTAL
BOUNDARY GENERATING WIDESPREAD LIGHT RAIN DESPITE RELATIVELY
MEAGER LOW LEVEL MOISTURE PROFILES. THIS LIGHT RAIN WILL LIKELY
CONTINUE THROUGH MUCH OF THE OVERNIGHT BUT CONDITIONS SHOULD
REMAIN PRIMARILY VFR. SOME MVFR CEILINGS AND VIS MAY BE
POSSIBLE AT KSBN BUT CONFIDENCE IS LOW. THIS FRONT LIFTS NORTH
SLIGHTLY FRIDAY MORNING BEFORE RETURNING SOUTH AGAIN AS A COLD
FRONT LATE THURSDAY. MVFR (OR LOWER) CEILINGS POSSIBLE AT KSBN
AT THE VERY END OF THIS FORECAST PERIOD AND LATER THURSDAY NIGHT
AT KFWA.
IWX WATCHES/WARNINGS/ADVISORIES
IN...NONE.
OH...NONE.
MI...NONE.
MARINE...NONE.
DISCUSSION...FISHER
AVIATION...AGD
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page