textproduct: Central Illinois

KEY MESSAGES

- A fast-moving storm system will bring another round of snow to central Illinois from Monday afternoon through Monday night. The highest accumulations of 2 to 4 inches will occur along and north of a Beardstown to Bloomington line.

- Much below normal temperatures will prevail through next weekend...with the coldest readings arriving Thursday night when 12z NBM guidance suggests a 40-60% chance of lows dipping below zero along and north of a Macomb to Tuscola line.

LONG TERM

(Tuesday through Next Sunday) Issued at 142 PM CST Sun Nov 30 2025

Cold and dry weather with highs in the middle to upper 20s is anticipated for Tuesday before winds become S/SW ahead of the next approaching cold front and a brief warming trend into the middle 30s occurs on Wednesday. A few models are suggesting the cold front may be accompanied by a few snow-showers late Wednesday afternoon into Wednesday night: however, the dry boundary layer will prevent any appreciable precip. Once the front passes, strong CAA will spill into the region for Thursday...resulting in high temperatures struggling to reach 20 degrees everywhere north of I-70. As skies clear and winds diminish, bitterly cold conditions are expected Thursday night. 12z NBM guidance suggests a 40-60% chance of sub-zero lows along/north of a Macomb to Tuscola line. After that, yet another southern-stream storm system will spread moisture back into Illinois on Friday. The atmosphere will initially be cold enough to support all snow: however, as an elevated warm layer advects northward, there could potentially be some light freezing rain along/south of I-70 Friday night. It is still too early to pinpoint any specific snow/ice accumulations at this time. While the system will not be as strong as the one that impacted central Illinois yesterday, it has the potential to bring another light snow accumulation by the end of the week. Once this wave passes, cold and generally dry weather is expected next weekend.

Barnes

AVIATION

(For the 18z TAFs through 18z Monday Afternoon) Issued at 1141 AM CST Sun Nov 30 2025

Northwest winds will become light and variable this evening as surface high pressure slides overhead. MVFR stratus looks to improve to VFR overnight before dropping back below 3k ft with our next approaching system late Monday morning. Some guidance has keyed in on an area of shallow fog developing late tonight near/south of the I-72 corridor, but probabilities of it falling below 3SM is fairly low (20-30%).

NMA

ILX WATCHES/WARNINGS/ADVISORIES

Winter Weather Advisory from noon Monday to 6 AM CST Tuesday for ILZ027>031-036>038-040>043-047-048.