553
FXUS63 KILX 220510
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
1210 AM CDT TUE SEP 22 2026
KEY MESSAGES
- COOLER WEATHER WILL PREVAIL THIS WEEK AS HIGH TEMPERATURES
RANGE FROM THE 60S TO 70S.
DISCUSSION
ISSUED AT 144 PM CDT MON SEP 21 2026
WATER VAPOR IMAGERY EARLY THIS AFTERNOON SHOWS AN UPPER LOW SPINNING
OVER EASTERN NEBRASKA/WESTERN IOWA WITH RIDGING ON BOTH SIDES OF IT.
AT THE SURFACE, A COLD/STATIONARY FRONT IS DRAPED FROM THE MID-
ATLANTIC STATES WESTWARD INTO ARKANSAS WITH HIGH PRESSURE CENTERED
OVER ONTARIO. WIDESPREAD CLOUD COVER WILL REMAIN IN PLACE THROUGH AT
LEAST TUESDAY MORNING AS LOW-LEVEL MOISTURE REMAINS TRAPPED BENEATH
A TEMPERATURE INVERSION, HOLDING TEMPERATURES SEVERAL DEGREES COOLER
THAN NORMAL.
SPOTTY SHOWERS/DRIZZLE ARE NOTED ON REGIONAL RADAR WITHIN THE
VICINITY OF THE AFOREMENTIONED UPPER LOW FROM CENTRAL IOWA INTO
NORTHWEST ILLINOIS, AND ALSO DOWNWIND OF LAKE MICHIGAN WHERE STEADY
NORTHEAST WINDS ARE SPREADING MOISTURE INLAND. SIMILAR CONDITIONS
ARE EXPECTED TO EXPAND EAST THROUGH TUESDAY MORNING AS THE UPPER LOW
POSITIONS ITSELF OVER EASTERN IOWA/NORTHWEST ILLINOIS BY DAYBREAK.
THESE SHOULD BE VERY LIGHT IN NATURE AND AMOUNT TO LITTLE
ACCUMULATION. TEMPERATURES ON TUESDAY WILL BE SIMILAR TO TODAY DUE
TO WIDESPREAD CLOUD COVER/PRECIPITATION WITH OVERNIGHT LOWS
DROPPING INTO THE LOW TO MIDDLE 50S. SUBSIDENCE ON THE BACKSIDE
OF THE UPPER LOW SHOULD RESULT IN SOME POCKETS OF CLEARING
ACROSS WEST- CENTRAL ILLINOIS TUESDAY NIGHT, POTENTIALLY OPENING
THE DOOR FOR A FEW SPOTS TO DIP DOWN INTO THE UPPER 40S (20-40%
CHANCE).
BY MIDWEEK, THE UPPER LOW MEANDERS INTO THE MID-ATLANTIC STATES WITH
SUBTLE RIDGING BUILDING IN ITS WAKE. TEMPERATURES WILL REMAIN COOL
THROUGH THE END OF THE WEEK, THEN GRADUALLY WARM BACK INTO THE 70S
TO LOW 80S BY THE LATTER HALF OF THE WEEKEND. PRECIPITATION CHANCES
LOOK MINIMAL MIDWEEK THROUGH THE WEEKEND, THOUGH A DEVELOPING LOW
OVER THE PLAINS STATES MAY BEGIN TO ENCROACH ON THE MIDWEST STATES
LATER THIS WEEKEND.
AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/
ISSUED AT 1209 AM CDT TUE SEP 22 2026
MVFR STRATUS IS EXPECTED ACROSS PORTIONS OF CENTRAL ILLINOIS
MUCH OF THE PERIOD, ESPECIALLY AT SPI AND DEC. FURTHER NORTH
ALONG THE I-74 CORRIDOR, CONDITIONS HAVE IMPROVED TO VFR AT
PIA/BMI/DEC, BUT ANOTHER AREA OF LOW STRATUS CURRENTLY OVER
NORTHWEST INDIANA WILL SPREAD SOUTHWEST OVERNIGHT. CMI HAS THE
BEST CHANCE OF GETTING INTO THE NEXT BATCH OF CLOUDS WHILE
PIA/BMI ARE EXPECTED TO REMAIN JUST NORTH OF THE LOW CLOUDS.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...NMA
DISCUSSION...NMA
AVIATION...DEUBELBEISS
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