133
FXUS63 KILX 170643
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
143 AM CDT SAT OCT 17 2026
KEY MESSAGES
- A FROST ADVISORY IS IN EFFECT THIS MORNING ALONG AND WEST OF
A LACON...TO LINCOLN...TO TAYLORVILLE LINE.
- FROST WILL BE LIKELY ACROSS AREAS GENERALLY EAST OF I-55
TONIGHT. SENSITIVE OUTDOOR PLANTS NEED TO BE PROTECTED THIS
WEEKEND IN ORDER TO AVOID DAMAGE.
DISCUSSION
ISSUED AT 143 AM CDT SAT OCT 17 2026
THE LARGE EASTERN US TROUGH IS APPROACHING THE EASTERN SEABOARD THIS
MORNING WITH NNW FLOW ALOFT IN ITS WAKE. AT THE SURFACE, HIGH
PRESSURE IS CENTERED OVER THE CENTRAL AND SOUTHERN HIGH PLAINS WITH
A RIDGE AXIS EXTENDING NORTHEAST THROUGH IA/WI/MI. A FEW LAKE EFFECT
SHOWERS WILL PERSIST ALONG THE IL/IN BORDER EARLY THIS MORNING,
MAINLY BRINGING A FEW CLOUDS TO EASTERN CENTRAL IL THIS MORNING. THE
SURFACE RIDGE AXIS WILL DRIFT SOUTHEAST TODAY WITH THE HIGH ACTUALLY
SHIFTING EAST TO THE OH RIVER VALLEY TONIGHT. EXPECT LIGHT
WINDS, CLEAR SKIES AND THE POTENTIAL FOR FROST TONIGHT. AFTER
HIGHS IN THE UPPER 50S OR SO TODAY, TEMPS WILL FALL THROUGH THE
50S AND 40S TONIGHT. THE WINDS WILL BE THE LIMITING FACTOR,
KEEPING TEMPS UP A BIT IN THE WESTERN ZONES. HOWEVER, EXPECTING
TEMPS TO BE IN THE 33 TO 36 DEGREE RANGE GENERALLY EAST OF I-55
LATE TONIGHT. IN MCLEAN CO, BLOOMINGTON/NORMAL MAY NOT COOL
ENOUGH FOR FROST DUE TO ITS HIGHER ELEVATION (IT MIGHT BE MORE
PATCHY), BUT AREAS EAST OF THE CITIES WILL LIKELY SEE AREAS OF
FROST. THE FURTHER WEST YOU GO, FROST WILL BE MORE PATCHY AND
LIMITED TO VALLEYS AND AREAS WHERE THE WIND CAN DECREASE. A
FROST ADVISORY HAS BEEN ISSUED FOR TONIGHT GENERALLY EAST OF
I-55.
ON SUNDAY, WE'LL PASS THROUGH "NORMAL" WITH HIGHS REBOUNDING CLOSER
TO NORMAL/AVERAGE FOR THIS TIME OF YEAR...THE MID 60S. SUNDAY NIGHT
THE SURFACE RIDGE AXIS WILL EXTEND WESTWARD FROM OH THROUGH IN TO
IL. SO, WE WILL LIKELY HAVE SOME RATHER LIGHT WINDS. HOWEVER OUR LOW
LEVEL TEMPS WILL HAVE WARMED A BIT, SO FROST SHOULDN'T BE AS LIKELY
AS IT IS TONIGHT. STILL, IT MIGHT BE CLOSE AND PATCHY IN SOME AREAS
OF EAST-CENTRAL IL. FOR MONDAY THROUGH FRIDAY, ILLINOIS WILL SEE
HIGHS RISE THROUGH THE 70S TO AROUND 80 WITH LOWS RISING FROM AROUND
40 TO AROUND 50. WITH AVERAGE HIGHS IN THE MID 60S FOR THIS TIME OF
YEAR, BEING 15 DEGREES ABOVE AVERAGE WILL BE RATHER SIGNIFICANT.
BY THE WEEKEND, WE'LL SEE A SYSTEM APPROACHING WITH HIGHS
LIKELY PEAKING IN THE LOW 80S FOR SATURDAY, FOLLOWED BY A COLD
FRONT AND A CHANCE FOR SHOWERS SUNDAY NIGHT.
AVIATION /06Z TAFS THROUGH 06Z SUNDAY/
ISSUED AT 1247 AM CDT SAT OCT 17 2026
VFR CONDITIONS WILL PREVAIL AT ALL TAF SITES WITH CLEAR SKIES
NEXT 24HRS. NORTH WINDS NOW THROUGH AM WITH SPEEDS AT 10KTS OR
LESS. LIGHT AND VARIABLE WINDS THEN PREVAIL REST OF TAF PERIOD.
ILX WATCHES/WARNINGS/ADVISORIES
FROST ADVISORY UNTIL 9 AM CDT THIS MORNING FOR ILZ027>031-036-
037-040>042-047>052.
FROST ADVISORY FROM 1 AM TO 9 AM CDT SUNDAY FOR ILZ038-043>046-
052>057-061>063-066>068-071>073.
KEY MESSAGES...KNUTSVIG
DISCUSSION...KNUTSVIG
AVIATION...AUTEN
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