089
FXUS63 KILX 271729
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
1229 PM CDT WED MAY 27 2026
KEY MESSAGES
- SHOWERS AND A FEW THUNDERSTORMS WILL PERSIST SOUTH OF I-72
TODAY...WITH A NARROW CORRIDOR FROM PARIS TO SHELBYVILLE
POTENTIALLY PICKING UP GREATER THAN 1 INCH OF RAINFALL.
- AIR QUALITY WILL BECOME UNHEALTHY FOR SENSITIVE GROUPS ACROSS
PORTIONS OF CENTRAL ILLINOIS TODAY DUE TO HIGH OZONE
CONCENTRATIONS.
- NO MAJOR STORM SYSTEMS ARE EXPECTED TO IMPACT THE REGION OVER
THE NEXT WEEK. AS A RESULT, THE SEVERE WEATHER RISK WILL
REMAIN VERY LOW (LESS THAN A 5% CHANCE) THROUGH NEXT TUESDAY.
UPDATE
ISSUED AT 1100 AM CDT WED MAY 27 2026
SOME MINOR ADJUSTMENTS TO CHANCES OF SHOWERS AND ISOLATED
THUNDERSTORMS OVER SE CWA INTO THIS AFTERNOON. REST OF FORECAST
LOOKS ON TRACK REST OF TODAY. SHOWERS HAVE BEEN DIMINISHING FROM
I-72 SOUTH PAST FEW HOURS, WITH A FEW LIGHT SHOWERS REMAINING NEAR
I-72 AT LATE MORNING. LATEST CAMS LIKE HRRR SHOW SOME
REDEVELOPMENT OF CONVECTION IN SOUTHEAST IL DURING MIDDAY AND
PROGRESSING SE DURING THE AFTERNOON, EXITING FAR SE CWA BY
23-00Z (6-7 PM). PW VALUES ARE 1.5-1.6 INCHES IN SOUTHEAST IL
AND COULD SEE ISOLATED BRIEF HEAVY RAINS IN SOUTHEAST IL DURING
THIS AFTERNOON. SPC DAY1 KEEPS MARGINAL RISK OF SEVERE STORMS
THIS AFTERNOON/EARLY EVENING EAST OF IL OVER SE INDIANA,
SOUTHERN OHIO AND NORTHEAST KY WHERE 5-14% RISK OF DAMAGING
WINDS ARE. MORE SUNSHINE OVER THE NW HALF OF CWA WITH HIGHS IN
THE MID TO UPPER 80S (ALREADY LOWER 80S FROM I-55 NW AT 11 AM).
MOSTLY CLOUDY TO OVERCAST SKIES ALONG AND SOUTH OF I-72 TO HAVE
DECREASING CLOUDS FROM NW TO SE DURING THE AFTERNOON WITH HIGHS
IN THE UPPER 70S/LOWER 80S.
DISCUSSION
ISSUED AT 338 AM CDT WED MAY 27 2026
*** SHOWERS SOUTH OF I-72 TODAY ***
08Z/3AM RADAR IMAGERY SHOWS A BAND OF SHOWERS AND THUNDERSTORMS
EXTENDING FROM NEAR PARIS TO SHELBYVILLE. THIS ACTIVITY HAS BEEN
LIFTING SLOWLY NORTHWARD OVER THE PAST COUPLE OF HOURS, BUT IS
LOSING SOME OF ITS MOMENTUM AS THE SHORT-WAVE TROUGH THAT
TRIGGERED IT PIVOTS NORTHEASTWARD INTO INDIANA. IN ADDITION,
THE SHOWERS WILL BE ENCOUNTERING A CONSIDERABLY DRIER/MORE
SUBSIDENT AIRMASS NORTH OF THE I-72 CORRIDOR WHERE CURRENT
DEWPOINTS ARE ONLY IN THE 50S. CAMS SEEM TO HAVE A GOOD HANDLE
ON THE BAND AND SUGGEST IT WILL EVENTUALLY STALL AND BEGIN TO
DISSIPATE NEAR OR JUST SOUTH OF A DANVILLE TO DECATUR LINE BY
DAYBREAK. AFTER A LULL IN PRECIP CHANCES BY MID TO LATE MORNING,
ADDITIONAL SHOWERS AND STORMS WILL DEVELOP ACROSS THE SAME AREA
THIS AFTERNOON BEFORE GRADUALLY DROPPING SOUTHEASTWARD AND
EXITING INTO THE OHIO RIVER VALLEY BY EARLY EVENING. WHILE NOT
ALL LOCATIONS ACROSS EAST-CENTRAL AND SOUTHEAST ILLINOIS WILL
SEE RAINFALL, A FAVORED CORRIDOR FROM PARIS TO SHELBYVILLE MAY
SEE AMOUNTS OVER 1 INCH. MEANWHILE NORTH OF I-72, CONDITIONS
WILL REMAIN DRY. HIGH TEMPERATURES WILL RANGE FROM THE UPPER 70S
NEAR I-70...TO THE UPPER 80S ALONG/NORTHWEST OF THE ILLINOIS
RIVER.
*** POOR AIR QUALITY TODAY ***
ELEVATED OZONE LEVELS IN THE CHICAGO AREA WILL GRADUALLY ADVECT
INTO CENTRAL ILLINOIS TODAY DUE TO WEAK NORTHEASTERLY FLOW
AROUND HIGH PRESSURE OVER THE UPPER MIDWEST. THE ILLINOIS
ENVIRONMENTAL PROTECTION AGENCY (EPA) INDICATES AIR QUALITY WILL
BECOME UNHEALTHY FOR SENSITIVE GROUPS ALONG/NORTH OF I-74. A
WEAK COLD FRONT CURRENTLY OVER WISCONSIN WILL DROP SOUTHWARD
THROUGH THE REGION TONIGHT, RESULTING IN INCREASING NORTHEASTERLY
WINDS WHICH SHOULD HELP DISPERSE THE OZONE AND IMPROVE AIR
QUALITY BY THURSDAY.
*** PROLONGED STRETCH OF QUIET WEATHER ***
AN OMEGA BLOCK WILL DEVELOP ACROSS THE CONUS...FEATURING DEEP
UPPER LOWS ALONG THE WEST COAST AND OVER NEW ENGLAND AND A
PERSISTENT RIDGE SANDWICHED BETWEEN THEM OVER THE MIDWEST. THIS
WILL ENSURE ANY APPROACHING SHORT-WAVES WILL BE SHUNTED S/SW OF
CENTRAL ILLINOIS THROUGH AT LEAST EARLY NEXT WEEK. AS A RESULT,
AM EXPECTING DRY CONDITIONS THURSDAY THROUGH NEXT NEXT TUESDAY
WITH SEASONABLE HIGH TEMPERATURES RANGING FROM THE UPPER 70S TO
THE MIDDLE 80S.
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
ISSUED AT 1230 PM CDT WED MAY 27 2026
ASIDE FROM BRIEF PERIODS OF MVFR CEILINGS AT DEC AND CMI TIL
20Z/3 PM, EXPECT VFR CONDITIONS TO PREVAIL ACROSS THE CENTRAL IL
AIRPORTS THROUGH 18Z/1 PM THU. ISOLATED SHOWERS AND
THUNDERSTORMS TO BE SOUTH OF I-72 AND PUSH SE THROUGH SOUTHEAST
IL DURING THIS AFTERNOON. SCATTERED TO BROKEN CUMULUS CLOUDS
WITH MVFR CEILINGS 2-3K FT NEAR DEC AND CMI AND SE TO PUSH SE OF
THESE TAF SITES NEXT FEW HOURS. NE WINDS 5-10 KTS TO PREVAIL
THIS AFTERNOON AND BE A BIT LIGHTER TONIGHT AND INCREASE TO 8-13
KTS ON THU MORNING.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...BARNES
UPDATE...07
DISCUSSION...BARNES
AVIATION...07
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