340
FXUS63 KILX 201742
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
1242 PM CDT THU AUG 20 2026
KEY MESSAGES
- SOME SHOWERS AND THUNDERSTORMS ARE STILL MOVING ACROSS CENTRAL
AND SOUTHEASTERN IL EARLY THIS MORNING AS A COLD FRONT PUSHES
SOUTH. BEHIND THE COLD FRONT, A WEAK HIGH PRESSURE CENTER
WILL BUILD OVER THE MIDWEST LATER TODAY INTO TOMORROW.
- A PERSISTENT NORTHWEST FLOW WILL KEEP TEMPERATURES AND
HUMIDITY LEVELS IN CHECK THE NEXT SEVERAL DAYS, WITH
SEASONABLE HIGHS IN THE UPPER 70S TO MID 80S AND LOWS IN THE
UPPER 50S TO 60S.
DISCUSSION
ISSUED AT 209 AM CDT THU AUG 20 2026
EARLIER IN THE NIGHT, THERE WAS SOME CONSIDERABLE FLASH FLOODING
THAT OCCURRED NORTH OF I-72. SOME SHOWERS AND THUNDERSTORMS ARE
STILL MOVING ACROSS CENTRAL AND SOUTHEASTERN IL THIS MORNING BUT THE
FLASH FLOODING THREAT APPEARS TO HAVE ENDED. HEAVY RAIN IS STILL
POSSIBLE IN THE STRONGER SHOWERS AS THIS COLD FRONT EXITS OFF TO THE
SOUTH THIS MORNING.
BEHIND THE COLD FRONT, A WEAK HIGH PRESSURE CENTER WILL BUILD OVER
THE MIDWEST LATER TODAY INTO TOMORROW. TODAY IS LOOKING TO BE QUITE
PLEASANT. THERE COULD BE SOME SPRINKLES/LIGHT RAIN IN SOUTH CENTRAL
IL THIS AFTERNOON, BUT RAINFALL AMOUNTS SHOULD BE MINIMAL. FRIDAY
THERE IS A 20-40% CHANCE OF ADDITIONAL SHOWERS, PERHAPS SOME THUNDER
TOO, AREA WIDE AS A WEAK UPPER DISTURBANCE PASSES OVERHEAD.
AFTER FRIDAY, A PRIMARILY DRY FORECAST IS ON DECK THROUGH EARLY NEXT
WEEK, WITH TEMPERATURES IN THE UPPER 70S TO 80S FOR HIGHS AND
UPPER 50S TO 60S FOR LOWS.
AVIATION /18Z TAFS THROUGH 18Z FRIDAY/
ISSUED AT 1245 PM CDT THU AUG 20 2026
MVFR CEILINGS OF 1.5-3K FT POSSIBLE AT SPI AND DEC TIL 19-20Z,
OTHERWISE VFR CONDITIONS GENERALLY FORECAST TO PREVAIL OVER THE
CENTRAL IL THROUGH 18Z/1 PM FRI WITH NEARBY WEAK 1018-1020 MB
HIGH PRESSURE RIDGE SETTLING SE OVER CENTRAL IL LATE TONIGHT/FRI
MORNING. PATCHY SHALLOW GROUND FOG IS POSSIBLE BETWEEN 09-14Z
AND HAVE MVFR VSBYS POSSIBLE THEN. NE WINDS 5-10 KTS THIS
AFTERNOON TO BECOME LIGHT AT SUNSET AND VARIABLE OVERNIGHT,
BEFORE VEERING SOUTH TO SW NEAR 5 KTS AFTER 14Z/9 AM FRI.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...COPPLE
DISCUSSION...COPPLE
AVIATION...07
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