textproduct: Central Illinois

KEY MESSAGES

- A Winter Weather Advisory is in effect tonight along and north of a Rushville...to Decatur...to Mattoon line for mixed precipitation and the potential for a thin glaze of ice.

- Another storm system will bring warmer conditions and mainly rain to central Illinois by Tuesday night into Wednesday.

LONG TERM

(Monday through Friday) Issued at 333 AM CST Sat Dec 6 2025

Cold and dry weather will be the rule on Monday with highs remaining in the 20s everywhere north of I-70. As southerly flow increases ahead of the next storm system, readings will rebound into the upper 30s and lower 40s by Tuesday. As has been seen by the past several model cycles, the Tuesday system will track well north of central Illinois...resulting in rain showers Tuesday night perhaps mixing with a few snow flakes on Wednesday as low pressure passes into the Great Lakes and winds veer to northwesterly. After that, forecast confidence is poor for next Thursday and Friday as models have not yet properly resolved another potential clipper system dropping southeastward out of Canada. Current forecast features low chance PoPs (30%) for snow on Thursday, but this will likely be adjusted over the next few days.

Barnes

AVIATION

(For the 06z TAFs through 06z Saturday Night) Issued at 1003 PM CST Fri Dec 5 2025

MVFR ceilings will overspread the central IL terminals from the northwest tonight. These ceilings are expected to lower into the low MVFR range late tonight and Saturday morning, with low-medium confidence of IFR ceilings developing at KBMI-KDEC-KCMI. Ceilings are forecast to hold across the region into Saturday night. A weather system will approach from the west late in the forecast with -RASN moving into KPIA. Winds southwest to west through the period under 10 kt.

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ILX WATCHES/WARNINGS/ADVISORIES

Winter Weather Advisory from 9 PM this evening to 6 AM CST Sunday for ILZ027>031-036>038-040>048-053>057-063.