076
FXUS63 KILX 050512
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
1212 AM CDT FRI JUN 5 2026
KEY MESSAGES
- A MARGINAL RISK FOR SEVERE THUNDERSTORMS ON DECK FOR TOMORROW,
WITH ISOLATED DAMAGING WIND GUSTS SERVING AS THE PRIMARY
RISK.
- AN UNSETTLED WEATHER PATTERN WILL BRING DAILY CHANCES OF
SHOWERS AND THUNDERSTORMS THROUGH THE MIDDLE OF NEXT WEEK.
- HUMIDITY BUILDS OVER CENTRAL AND SOUTHEAST ILLINOIS THIS
WEEKEND AND LINGERS INTO NEXT WEEK, DRIVING PEAK HEAT INDEX
VALUES INTO THE LOW TO MID 90S. A NONZERO (10- 20%) CHANCE FOR
HEAT INDICES ABOVE 100 DEGREES EXISTS FOR LATE NEXT WEEK.
DISCUSSION
ISSUED AT 218 PM CDT THU JUN 4 2026
THE HIGH PRESSURE CENTER DRIFTED OFF TO THE SOUTHEAST OF CENTRAL IL,
SHIFTING THE FLOW TO A MORE SOUTHERLY DIRECTION TODAY. THIS WILL
SUPPORT INCREASING MOISTURE AS WE GO INTO THE WEEKEND, STARTING
TODAY. HIGHS WILL INCREASE TO THE UPPER 80S TO LOW 90S, WITH
DEWPOINTS IN THE MID 60S TO LOW 70S FOR FRIDAY INTO MONDAY. HEAT
INDICES COULD BUMP NORTH OF 90 DEGREES BY SATURDAY AND LOOKS TO
POTENTIALLY CONTINUE INTO THE NEW WEEK. THE LREF SHOWS A NONZERO (10-
20%) CHANCE FOR APPARENT TEMPS ABOVE 100 DEGREES LATE NEXT WEEK. IN
CONCLUSION... SUMMER HAS ARRIVED.
A SHORTWAVE WILL PULSE THROUGH THE REGION TOMORROW, BRINGING RAIN
CHANCES INTO THE FORECAST. THE SHOWERS AND THUNDERSTORMS TOMORROW
INTO SATURDAY COULD BE EFFICIENT RAIN PRODUCERS WITH PWATS AROUND
1.7-2.0 INCHES. THE CONVECTIVE COMPLEX MOVING IN FROM IOWA WILL BE
DECAYING AS IT ENTERS OUR WESTERN CWA. SPC HAS OUTLINED A MARGINAL
RISK (LEVEL 1/5) OF SEVERE WEATHER NORTH OF A MOUNT STERLING TO
GIBSON CITY LINE. THE PRIMARY THREAT WILL BE ISOLATED DAMAGING WIND
GUSTS AS A PULSE OR MULTICELL STORM COLLAPSES. THE HIGHER RAINFALL
AMOUNTS WILL BE LOCALIZED WHERE MULTIPLE SHOWERS OR THUNDERSTORMS
PASS OVER THE SAME AREA DURING THIS TIME. OUTSIDE OF CONVECTIVE
ACTIVITY, A TIGHTENING PRESSURE GRADIENT WILL CAUSE SOUTHWESTERLY
WIND GUSTS TO EXCEED 25 MPH AT TIMES.
THERE DOES APPEAR TO BE THE POSSIBILITY OF A FEW MORE WEAK ROUNDS OF
CONVECTION INTO WEDNESDAY. THE TIMING AND RAINFALL AMOUNT FORECAST
REMAINS UNCERTAIN AT THIS TIME, DUE TO WEAK FORCING. A CUTOFF UPPER-
LEVEL LOW OR SLOW-MOVING TROUGH IS FORECAST TO DEVELOP AND LINGER
AROUND THE MIDWEST, WHILE A WEAK FRONTAL BOUNDARY DRIFTS AROUND THE
AREA. THE EXTENDED FORECAST RELIES HEAVILY ON THE NBM DUE TO THAT
UNCERTAINTY. LOOKING BEYOND THE SEVEN-DAY WINDOW, THE CPC 6-10 DAY
OUTLOOK HIGHLIGHTS A STRONG SIGNAL FOR A PERSISTENCE OF ABOVE-NORMAL
TEMPERATURES ACROSS THE CENTRAL U.S.
AVIATION /06Z TAFS THROUGH 06Z SATURDAY/
ISSUED AT 1212 AM CDT FRI JUN 5 2026
AREA OF SHOWERS/STORMS CURRENTLY EXTENDING FROM NEAR KANSAS CITY
TO SOUTHWEST WISCONSIN IS EXPECTED TO LOSE SOME OF ITS PUNCH
BEFORE REACHING CENTRAL ILLINOIS. CURRENTLY PROJECTING THE
15-18Z TIME FRAME FOR IT TO PASS THE TERMINALS, THOUGH A PROB30
GROUP FOR SOME THUNDER AT KPIA/KSPI WILL REMAIN IN THE NEW TAF
SET. TOWARD THE END OF THE PERIOD, THE EVENING MODEL GUIDANCE IS
SUGGESTING A WEST-EAST LINE OF CONVECTION DEVELOPING IN NORTHERN
OR CENTRAL ILLINOIS. THINKING THAT MOST OF THIS THREAT WILL BE
AFTER 06Z, BUT WILL INCLUDE A PROB30 AT KPIA FOR THE LAST COUPLE
HOURS.
SOUTH WINDS ARE EXPECTED TO PICK UP OVERNIGHT, AND GUSTS 20-25
KNOTS SHOULD BE COMMON BY MID MORNING AS WINDS TREND MORE
SOUTHWEST. THE GUSTS ARE EXPECTED TO DROP OFF AFTER 00Z, THOUGH
SUSTAINED WINDS 10-15 KNOTS ARE STILL LIKELY IN EASTERN ILLINOIS
THROUGH FRIDAY EVENING.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...COPPLE
DISCUSSION...COPPLE
AVIATION...GEELHART
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