860
FXUS63 KILX 210715
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
215 AM CDT FRI AUG 21 2026
KEY MESSAGES
- A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS THIS
AFTERNOON/EVENING NORTH OF A LINE FROM BEARDSTOWN TO LINCOLN
TO GIBSON CITY. HAIL (15%), WIND (15%), AND TORNADO (2%)
THREATS WILL EXIST IN THIS AREA, WITH LOWER PROBABILITIES
FURTHER SOUTH.
DISCUSSION
ISSUED AT 215 AM CDT FRI AUG 21 2026
WEAK HIGH PRESSURE OVER IL THIS MORNING WILL GIVE WAY TO A WEAK
COLD FRONT TONIGHT ALONG WITH AN UPPER LEVEL WAVE. WITH CAPES OF
2000-3000 J/KG AND SHEAR AROUND 30-35 KTS, SEVERE STORMS WILL
BE POSSIBLE LATE THIS AFTERNOON AND THIS EVENING. EXPECT SOME
DISCRETE CELLS DEVELOPING IN NORTHERN IL/EASTERN IA EARLY IN THE
AFTERNOON, DRIFTING SOUTH-SOUTHEAST THROUGH CENTRAL IL DURING
THE LATE AFTERNOON AND EVENING HOURS. THE SPC HAS CENTRAL IL IN
A SLIGHT RISK FOR TODAY (LEVEL 2 OUT OF 5) NORTH OF A LINE FROM
BEARDSTOWN TO LINCOLN TO GIBSON CITY. HAIL (15%), WIND (15%),
AND TORNADO (2%) THREATS WILL EXIST IN THE SLIGHT RISK AREA.
FURTHER SOUTH A MARGINAL RISK EXISTS...NORTH OF A LINE FROM
EFFINGHAM TO DANVILLE, WITH MAINLY LOW END HAIL/WIND (5%) THREATS
FOR THIS EVENING IN THIS AREA.
LATE TONIGHT, STORMS WILL LIKELY WIND DOWN BY MIDNIGHT OR
SHORTLY THEREAFTER, WITH WINDS SHIFTING TO THE NORTHWEST AFTER
THE COLD FRONT MOVES THROUGH THE AREA. EXPECT SUNNY SKIES, LIGHT
NORTHWEST WINDS, AND TEMPERATURES REBOUNDING INTO THE LOW 80S
DURING THE AFTERNOON. A FEW OF THE MODELS HAVE AN ISOLATED
STORM OR TWO DEVELOPING IN CENTRAL IL ON SATURDAY AFTERNOON.
HOWEVER, THE PROBABILITY IS AT 10% OR LESS, SO DID NOT INCLUDE
IT IN THE FORECAST. LEAVING OUT THUNDER FOR SATURDAY MATCHES
SPC'S GUIDANCE AS WELL.
NORTHWESTERLY FLOW ALOFT WILL CONTINUE THROUGH THE WEEKEND AND
INTO NEXT WEEK. AN UPPER LEVEL TROUGH MOVING SOUTHEAST ACROSS
THE GREAT LAKES REGION BY MID WEEK COULD BRING A FEW SHOWERS OR
STORMS TO THE AREA. BUT GENERALLY EXPECT A DRIER PATTERN ALONG
WITH TEMPS NEAR TO SLIGHTLY BELOW NORMAL FOR THE REMAINDER OF
THE PERIOD.
AVIATION /06Z TAFS THROUGH 06Z SATURDAY/
ISSUED AT 1220 AM CDT FRI AUG 21 2026
A WEAK RIDGE OF HIGH PRESSURE AT THE SURFACE THIS MORNING WILL
HELP FAVOR FOG/MIST PRODUCTION ACROSS THE CENTRAL IL TERMINALS
FOR A FEW HOURS. CONTINUED WITH THE TEMPO OF 4SM AND BR FOR NOW.
CMI LOOKS TO BE THE MOST FAVORABLE TERMINAL FOR FOG. OTHERWISE,
CALM TO LIGHT WINDS ARE EXPECTED THIS MORNING AND REALLY
THROUGH THE DAY. EXPECT SOME SHOWERS AND THUNDERSTORMS FIRING
ACROSS NORTHERN IL IN THE LATE AFTERNOON/EARLY EVENING HOURS
(FRIDAY) AND DROPPING SOUTH TO SOUTHEAST ACROSS CENTRAL IL.
STORMS SHOULD BE DONE BY 06Z WITH THE MOST FAVORABLE TIME FOR
CENTRAL IL BEING 00Z TO 06Z. ONLY HAVE PROB30 FOR STORMS DUE TO
GENERALLY SCATTERED COVERAGE BEING EXPECTED.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...KNUTSVIG
DISCUSSION...KNUTSVIG
AVIATION...KNUTSVIG
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