302
FXUS63 KILX 060634
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
134 AM CDT SUN SEP 6 2026
KEY MESSAGES
- WELCOMED RELIEF IS IN STORE FOR TODAY AND MONDAY, WITH HIGH
TEMPERATURES IN THE 80S FOR MOST LOCATIONS AND DROPPING HEAT
INDICES INTO THE 80S, NEAR 90.
- HIGH HEAT AND HUMIDITY RETURN TUESDAY AND WEDNESDAY. WEDNESDAY
LOOKS TO BE THE HOTTEST, BRINGING ANOTHER RISK FOR TRIPLE-
DIGIT HEAT INDEX VALUES. THERE IS A 20-30% CHANCE OF HEAT
INDICES GREATER THAN 100 DEGREES SOUTH OF I-70 WEDNESDAY
AFTERNOON.
DISCUSSION
ISSUED AT 134 AM CDT SUN SEP 6 2026
A BACKDOOR COLD FRONT PUSHED INTO THE AREA YESTERDAY EVENING, WHICH
WILL BRING "RELIEF" TODAY AND MONDAY, WHERE HEAT INDICES WILL BE IN
THE MID 80S TO NEAR 90 AND HIGHS IN THE 80S TO LOW 90S. THESE COOLER
TEMPERATURES WILL WARM BACK UP TO LOW TO UPPER 90S BY TUESDAY AND
WEDNESDAY AS THE UPPER RIDGING BUILDS BACK EASTWARD ONCE AGAIN.
THERE IS A 20-30% CHANCE OF HEAT INDICES GREATER THAN 100 DEGREES
SOUTH OF I-70 WEDNESDAY AFTERNOON, FROM THE LREF.
A WEAK COLD FRONT WILL MOVE THROUGH ON WEDNESDAY AS THE RIDGE GETS
BROKEN DOWN BY AN UPPER LOW, POTENTIALLY STALLING OUT ACROSS IL. IT
WILL BRING ANOTHER TWO DAY BREAK FROM THE SWELTERING MID TO UPPER 90
TEMPERATURES, DROPPING TEMPERATURES INTO THE LOW TO MID 80S BEFORE
BUILDING BACK TO NEAR 90 FOR THE WEEKEND.
THE NEXT CHANCE FOR ANY RAIN WILL COME THURSDAY WITH THE GREATEST
POPS (50-70%) MAINLY NEAR AND SOUTH OF I-72. A STRENGTHENING LLJ
WILL REINVIGORATE THUNDERSTORM DEVELOPMENT ALONG THE STALLED
BOUNDARY. AS OF NOW, THE MACHINE LEARNING MODELS ARE NOT SHOWING A
SEVERE THREAT WITH THESE STORMS. THE PWATS LOOK TO BE AROUND 1.8-2.2
INCHES AND WPC HAS A MARGINAL RISK FOR EXCESSIVE RAINFALL FOR DAY 5
(THURSDAY).
AVIATION /06Z TAFS THROUGH 06Z MONDAY/
ISSUED AT 1209 AM CDT SUN SEP 6 2026
AN AREA OF CEILINGS JUST ABOVE 1,000 FEET IS PUSHING SOUTHWEST,
WITH THE LEADING EDGE EXTENDING FROM ABOUT KBMI-KCMI THIS HOUR.
THE LOW CLOUDS ARE GUIDED BY NORTHEAST WINDS NEAR 10 KNOTS.
MODEL GUIDANCE AND ENSEMBLES ARE SUGGESTING ABOUT A 4-5 HOUR
PERIOD OF MVFR CONDITIONS AT EACH TAF SITE, AND THE BAND OF LOW
CLOUDS SHOULD BE SOUTHWEST OF THE TERMINALS BY 12-13Z. AFTER
THAT, CLOUDS INTO SUNDAY EVENING SHOULD JUST BE SCATTERED.
NORTHEAST WINDS WILL PREVAIL THROUGH THE PERIOD. SOME WINDS NEAR
10 KNOTS ARE OCCURRING NEAR THE LEADING EDGE OF THE CLOUD DECK
AND SHOULD SUBSIDE FOR A TIME, BUT PICK UP AGAIN SUNDAY MORNING
AFTER SKIES CLEAR.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...COPPLE
DISCUSSION...COPPLE
AVIATION...GEELHART
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