textproduct: Central Illinois

KEY MESSAGES

- The first widespread freeze is expected (80-100% chance) across central and southeast IL by dawn Saturday morning. - NBM has an 80-100% probability of lows below 32F over central IL overnight north of I-70, and greater than 50% chance southeast of I-70 getting below 32F late tonight.

DISCUSSION

Issued at 200 PM CST Fri Nov 6 2026

The early afternoon surface map shows a cold front pushing well se of IL into east TN, while 1023 mb Canadian high pressure extended from eastern KS across Iowa and into the upper MS river valley. Breezy NNW winds gusting 17-25 mph over central IL today. Broken to overcast low clouds lingered south of I-70 and from Jacksonville sw, while much of central IL was enjoying mostly sunny skies. Cool temps were in the upper 40s central IL and lower 50s from highway 50 south. NNW winds have brought in drier continental air with dewpoints in the low to mid 30s.

High pressure to settle over the MO valley and ridge into central IL during overnight, helping to clear skies and diminish winds this evening. This will set us up for a coldest night of the season and 1st widespread freeze of the season with lows 28-32 expected. NBM has an 80-100% probability of lows below 32F over central IL overnight north of I-70, and greater than 50% chance southeast of I-70 getting below 32F tonight. High clouds to increase from the nw late tonight into Saturday as a weak trof approaches central IL with partly to mostly sunny skies and lighter winds on Saturday. Cool again with highs in the lower 50s, with Lawrenceville near 55F. Another frosty night expected Sat night with lows 30-35F. NBM has a 50-90% chance of temps getting below 32F east of I-55 overnight Sat night.

West to SW winds increase on Sunday as high pressure ridge slips to our south/se with gusts up to 20 mph, and sunny skies, giving milder highs in the lower 60s. Lows in the mid 30s Sunday night. Warmup continues Monday and Tuesday with highs in the mid to upper 60s with a fair amount of sunshine.

Semi-zonal WNW upper level flow over the Midwest during early to middle part of next week to bring fair/pleasant weather to the area through at least Wed. Models are trending further south with a northern stream short wave into IL Wed night and Thu and may bring next chance of rain showers. Though blended forecast (NBM) keeps pops below 15% over CWA.

The Climate Prediction Center (CPC) 8-14 Day Outlook for Nov 13-19th has a 55-65% chance of above normal temperatures over IL with precipitation trending near normal.

AVIATION /06Z TAFS THROUGH 06Z SUNDAY/

Issued at 1030 PM CST Fri Nov 6 2026

VFR conditions next 24 hours. Northwest wind under 5 kt tonight, will back to the west by midday at 5-10 kt.

ILX WATCHES/WARNINGS/ADVISORIES

None.