517
FXUS63 KILX 230504
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
1204 AM CDT SUN AUG 23 2026
KEY MESSAGES
- RELATIVELY BENIGN WEATHER IS ON TAP FOR THE UPCOMING WEEK,
WITH THE PRIMARY CHANCE FOR ANY RAIN AROUND MID WEEK.
- TEMPERATURES WILL NOT BE OUT OF THE ORDINARY FOR THIS TIME OF
YEAR, WITH HIGH TEMPERATURES NEAR 80 DEGREES SUNDAY AND MONDAY
CREEPING UPWARD A BIT THROUGH THE WEEK.
UPDATE
ISSUED AT 838 PM CDT SAT AUG 22 2026
SPOTTY SHOWERS ASSOCIATED WITH AN OUTFLOW BOUNDARY HAVE ALL BUT
COME TO AN END AS THEY REACHED ALONG AND SOUTH OF I-70. THE REST
OF THE NIGHT WILL FEATURE BENIGN CONDITIONS AS LIGHT NORTHERLY
BREEZES CONTINUE. CLOUD COVER WILL BE MINIMAL AS LOWS DIP INTO
THE UPPER 50S TO LOWER 60S. AN UNUSUALLY COMFORTABLE AUGUST NIGHT
IS IN STORE.
DISCUSSION
ISSUED AT 222 PM CDT SAT AUG 22 2026
DIURNAL CUMULUS DEVELOPMENT HAS BEEN INCREASING ACROSS THE
NORTHERN CWA EARLY THIS AFTERNOON. WHILE SURFACE CAPE'S IN THAT
AREA ARE AROUND 2000 J/KG, MID LEVEL LAPSE RATES ARE FAIRLY LOW.
BETWEEN THAT AND DEW POINTS ONLY IN THE LOW-MID 60S, ANY
PRECIPITATION THIS AFTERNOON SHOULD MAINLY BE IN THE FORM OF
SPRINKLES. THE DRY AIR WILL RESULT IN A COUPLE OF PLEASANT
NIGHTS, WITH LOWS AROUND 60 TONIGHT AND MID-UPPER 50S SUNDAY
NIGHT.
THE OVERALL UPPER PATTERN OVER THE NEXT SEVERAL DAYS WILL FAVOR
A NORTHWEST FLOW INTO THE MIDWEST, WHICH WILL KEEP ANY SIGNIFICANT
HEAT OR MOISTURE SURGES AT BAY. THE MOST INTERESTING FEATURE OF
NOTE WILL BE A SHORTWAVE DIVING SOUTHEAST AROUND MID WEEK. WITH
MOST OF THE AVAILABLE MOISTURE NEAR THE GREAT LAKES, RAIN
CHANCES THIS FAR SOUTH WILL BE MORE QUESTIONABLE, WITH 20-30%
CHANCES MAINLY CENTERED ON WEDNESDAY NIGHT. TEMPERATURES CREEP
UPWARD AND ARE EXPECTED TO REACH THE MID 80S BY MID WEEK, WITH
ENOUGH MOISTURE IN PLACE TO GET THE HEAT INDEX TO AROUND 90 IN A
FEW PLACES.
AVIATION /06Z TAFS THROUGH 06Z MONDAY/
ISSUED AT 1203 AM CDT SUN AUG 23 2026
HIGH PRESSURE OVER THE UPPER MIDWEST TONIGHT WILL SLOWLY SPREAD TO
CENTRAL ILLINOIS BY SUNDAY EVENING. A LIGHT NORTHWEST WIND UNDER 10
KT WILL PREVAIL ACROSS CENTRAL ILLINOIS THROUGH THE DAY SUNDAY, THEN
WILL GIVE WAY TO LIGHT AND VARIABLE WINDS UNDER THE RIDGE AXIS
SUNDAY NIGHT. OUTSIDE OF AN OFF CHANCE FOR SOME PATCHY FOG THAT
REDUCES VISIBILITY EARLY SUNDAY MORNING, VFR CONDITIONS ARE
EXPECTED TO PREVAIL ACROSS CENTRAL ILLINOIS THROUGH THE
PERIOD.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...GEELHART
UPDATE...SHIMON
DISCUSSION...GEELHART
AVIATION...DEUBELBEISS
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page