552
FXUS63 KILX 272334
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
ISSUED BY NATIONAL WEATHER SERVICE ST LOUIS MO
634 PM CDT WED MAY 27 2026
KEY MESSAGES
- SCATTERED SHOWERS AND A FEW THUNDERSTORMS WILL DIMINISH SOUTH OF
I-70 THROUGH EARLY EVENING.
- NO MAJOR STORM SYSTEMS ARE EXPECTED TO IMPACT THE REGION
THROUGH THE MIDDLE OF NEXT WEEK. AS A RESULT, THE SEVERE
WEATHER RISK WILL REMAIN VERY LOW (LESS THAN A 5% CHANCE)
THROUGH NEXT WEDNESDAY.
DISCUSSION
ISSUED AT 338 PM CDT WED MAY 27 2026
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS SOUTH OF A PARIS TO
SHELBYVILLE TO LITCHFIELD LINE WERE ALONG AND AHEAD OF A WEAK SURFACE
BOUNDARY NEAR I-70. THIS BOUNDARY AND ITS ASSOCIATED CONVECTION TO
GRADUALLY PUSH SE THE NEXT FEW HOURS, EXITING FAR SOUTHEAST IL DURING
EARLY EVENING/BY SUNSET. SCATTERED TO BROKEN LOW/MID CLOUDS FROM I-72
SOUTH WILL DECREASE FROM NW TO SE INTO THIS EVENING. LATEST CAMS SHOW
PATCHY FOG (LOCALLY DENSE) DEVELOPING IN SOUTHEAST IL DURING OVERNIGHT
AND LIFTING BY MID THU MORNING. LOWS OVERNIGHT IN THE LOWER 60S.
WARM HIGHS THU IN THE LOW TO MID 80S WITH STRONGER NE WINDS BEHIND THE
COLD FRONT BRINGING DRIER AIR INTO AREAS FROM I-72 NORTH THU AFTERNOON
AS DEWPOINTS SLIP INTO THE LOW TO MID 50S BY LATE THU AFTERNOON.
ELEVATED OZONE LEVELS IN THE CHICAGO METRO AREA WILL GRADUALLY
ADVECT SLOWLY SOUTHWEST TOWARD CENTRAL ILLINOIS THIS AFTERNOON WITH
NORTHEAST FLOW, BUT MOSTLY STAY NORTHEAST OF I-74. THE ILLINOIS
ENVIRONMENTAL PROTECTION AGENCY INDICATES AIR QUALITY WILL BECOME
UNHEALTHY FOR SENSITIVE GROUPS NORTHEAST OF I-74. A WEAK COLD FRONT
CURRENTLY OVER NORTHEAST IL WILL DROP SOUTHWEST TOWARD CENTRAL IL
OVERNIGHT INTO THURSDAY MORNING, RESULTING IN INCREASING NORTHEAST
WINDS WHICH SHOULD HELP DISPERSE THE OZONE AND INCREASE AIR QUALITY
BY THURSDAY.
AN OMEGA BLOCK WILL DEVELOP ACROSS THE COUNTRY WITH DEEP UPPER LOWS
ALONG THE WESTERN U.S. AND OVER NEW ENGLAND, AND A PERSISTENT
UPPER LEVEL RIDGE IN BETWEEN THEM OVER THE MIDWEST INCLUDING ILLINOIS.
THIS WILL KEEP ANY APPROACHING SHORTWAVES SHUNTED S/SW OF CENTRAL
ILLINOIS THROUGH AT LEAST EARLY NEXT WORK WEEK, ALONG WITH DEEPER
GULF MOISTURE SOUTH OF IL. THEREFORE DRY CONDITIONS SHOULD PREVAIL
OVER CENTRAL/SE IL TONIGHT THROUGH NEXT WEDNESDAY, WITH SEASONABLE
HIGH TEMPERATURES RANGING FROM THE UPPER 70S TO MID 80S (WARMEST
TEMPERATURES OVER THE ILLINOIS RIVER VALLEY).
AVIATION /00Z TAFS THROUGH 00Z FRIDAY/
ISSUED AT 630 PM CDT WED MAY 27 2026
CONFIDENCE IS HIGH IN DRY AND VFR FLIGHT CONDITIONS AT THE LOCAL
TERMINALS THROUGH THE TAF PERIOD. WINDS HOLD GENERALLY OUT OF
THE EAST-NORTHEAST, INCREASING IN STRENGTH AFTER SUNRISE
TOMORROW.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...WFO ILX
DISCUSSION...WFO ILX
AVIATION...WFO ILX
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