642
FXUS61 KILN 041829
AFDILN
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
229 PM EDT FRI SEP 4 2026
WHAT HAS CHANGED
NO MAJOR CHANGES.
KEY MESSAGES
1) HEAT HEADLINES CONTINUE INTO THE EVENING FOR MUCH OF THE REGION.
HOT AND MUGGY CONDITIONS CONTINUE AGAIN ON SATURDAY, THOUGH WILL
LIKELY FALL BELOW HEADLINE CRITERIA.
2) STRONG TO SEVERE STORMS WILL BE POSSIBLE AT TIMES THROUGH THE
OVERNIGHT INTO SATURDAY. ANY STORMS THAT DEVELOP MAY PRODUCE LOCALLY
HEAVY RAINFALL.
DISCUSSION
KEY MESSAGE 1)
AS EXPECTED, THE INFLUENCE OF THUNDERSTORMS AND THEIR OUTFLOW
BOUNDARIES HAVE LARGELY KEPT HIGHER HEAT INDICES AWAY FROM A LARGE
PORTION OF CENTRAL OHIO. OTHERWISE, TEMPERATURES IN THE LOW TO MID
90S AND DEWPOINTS IN THE LOW 70S ARE SUPPORTING WIDESPREAD HEAT
INDICES OF 100-105 DEGREES.
THUNDERSTORMS OVERNIGHT MAY LARGELY IMPACT THE POTENTIAL FOR ANOTHER
ROUND OF HEAT ACROSS SOUTHWEST PORTIONS OF THE AREA ON SATURDAY.
GIVEN THE UNCERTAINTY, WILL LIKELY ALLOW THE CURRENT ADVISORY TO
EXPIRE AT 8PM, THEN WAIT UNTIL THE OVERNIGHT ACTIVITY OCCURS BEFORE
ISSUING A NEW ADVISORY.
KEY MESSAGE 2)
CONDITIONS HAVE WARMED UP THROUGHOUT THE DAY AND THUNDERSTORMS
CONTINUE TO DEVELOP AND DISSIPATE ACROSS THE LOCAL AREA, STRUGGLING
TO ORGANIZE TO A LEVEL THAT WOULD PRODUCE WIDESPREAD DAMAGING WIND
IMPACTS. THERE IS PLENTY OF INSTABILITY AND SOME WIND SHEAR EXISTS,
BUT ORGANIZATION HAS BEEN A CHALLENGE. THIS IS PRIMARILY DUE TO
NORTHWEST TO SOUTHEAST BOUNDARIES NOT BEING FAVORABLE TO THE
NORTHWESTERLY STEERING FLOW. AS THE STORMS MOVE FARTHER SOUTHWEST,
THE WIND SHEAR IS LOWER, LIMITING THE POTENTIAL FOR ORGANIZED STORMS.
THE ORIENTATION OF THE STORMS IS MUCH MORE FAVORABLE ACROSS SOUTHEAST
OHIO INTO WEST VIRGINIA, WHERE A SEVERE THUNDERSTORM WATCH IS
CURRENTLY IN PLACE.
TO THE NORTHWEST, ANOTHER LINE OF STORMS WITH A BETTER DIRECTIONAL
ORIENTATION IS MOVING INTO NORTHWEST OHIO, HOWEVER, RECENT TRENDS
HAVE SHOWN A GRADUAL WEAKENING TREND OVER THE LAST HOUR OR SO.
INSTEAD, A FOCUSED AREA OF CONVERGENCE ACROSS EAST CENTRAL INDIANA
AND WEST-CENTRAL OHIO COULD PROVIDE THE BEST OPPORTUNITY FOR MORE
ROBUST THUNDERSTORMS THROUGH THE AFTERNOON. DAMAGING WINDS REMAIN THE
PRIMARY CONCERN THIS AFTERNOON AND EVENING.
IF A LARGE THUNDERSTORM COMPLEX FAILS TO FORM AND MOVE THROUGH THE
AREA OVERNIGHT, LOW-LEVEL JET DRIVEN THUNDERSTORMS MAY ACROSS
THROUGHOUT THE AREA INTO SATURDAY MORNING AHEAD OF AN APPROACHING
SHORTWAVE. THIS IS TYPICALLY FOUND ON THE WESTERN EDGE OF THE
THUNDERSTORM ACTIVITY FROM THE PREVIOUS DAY. AS TEMPERATURES WARM UP
SATURDAY MORNING, ADDITIONAL THUNDERSTORMS WOULD THEN DEVELOP WITH
THE RENEWED ENERGY. RIGHT NOW, THE CONFIDENCE IN THIS OCCURRING IS
OVER SOUTHWEST PORTIONS OF THE AREA (SOUTHEAST INDIANA, SOUTHWEST
OHIO, NORTHERN KENTUCKY). A DAMAGING WIND THREAT WOULD ONCE AGAIN
EXIST WITH THESE THUNDERSTORMS.
OVERALL, CONFIDENCE REMAINS LOW FOR ANY PARTICULAR SCENARIO. THE
RIDGE BREAKDOWN WILL OCCUR INTO THE WEEKEND, BUT THE ULTIMATE IMPACTS
ACROSS THE AREA ARE UNCERTAIN.
WITH PWATS WELL ABOVE NORMAL, MULTIPLE THUNDERSTORM COMPLEXES WILL
PROVIDE THE OPPORTUNITY FOR LOCALLY HEAVY RAINFALL AND FLASH
FLOODING, ESPECIALLY FOR AREAS WHERE STORMS MOVE OVER REPEATEDLY.
AVIATION /18Z FRIDAY THROUGH WEDNESDAY/
SEVERAL OUTFLOW BOUNDARIES ARE MOVING THROUGH AREA TAF SITES,
ADJUSTING LOCAL WINDS AND PROVIDING CHANCES FOR THUNDERSTORMS. TOUGH
TO NAIL DOWN ANY SPECIFIC PERIOD WHERE CONFIDENCE IS HIGHER ON
THUNDERSTORM IMPACTS. THE BEST CHANCES THIS AFTERNOON AND EVENING ARE
DAY/ILN/CMH/LCK, AND THE BEST CHANCES TOMORROW ARE FOR CVG/LUK.
EXPECT ADJUSTMENTS AS CONFIDENCE INCREASES.
THE MAJORITY OF THE WINDS ARE WESTERLY TO NORTHWESTERLY, WITH SOME
VARIATIONS AS THUNDERSTORM OUTFLOWS MOVE THROUGH.
SOME MVFR CONDITIONS ARE MENTIONED FOR CMH/LCK FOR TOMORROW WITH THE
FOCUS FOR ADDITIONAL THUNDERSTORMS SOUTHWEST OF THE GREATER COLUMBUS
AREA.
OUTLOOK...THUNDERSTORMS POSSIBLE AT TIMES THROUGH SATURDAY.
ILN WATCHES/WARNINGS/ADVISORIES
OH...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR OHZ034-035-042>044-
051>055-060>065-070>074-077>082-088.
KY...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR KYZ089>100.
IN...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR INZ050-058-059-066-
073>075-080.
DISCUSSION...MCGINNIS
AVIATION...MCGINNIS
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