textproduct: Central Illinois

KEY MESSAGES

- A Winter Weather Advisory is in effect for nearly all of central Illinois this afternoon through tonight. Storm total snowfall will range from 2 to 5 inches.

- Another fast-moving system will bring a period of snow on Saturday. The latest NBM shows a 50-80% chance of greater than 2 inches of snow.

- A surge of bitterly cold air will result in sub-zero apparent temperatures Friday night through Monday morning.

UPDATE

Issued at 1030 AM CST Thu Dec 11 2025

We are starting to see some returns on the radar for west-central IL, but no reports at any of the ground stations of any falling precipitation. A clipper system is still expected to move through the forecast area today into tonight. Timing is continuing to show snow onset by 3pm in west central IL. Snow amounts haven't changed as of this update with a forecast amount of 2-5 inches.

Copple

..Bitterly Cold Conditions This Weekend

As has been advertised for the past several days, another surge of extremely cold air will arrive this weekend. High temperatures will drop from the 30s on Friday into the single digits by Sunday. While wind-chill values will dip below zero across parts of the area by late Friday night, the coldest period will be Saturday night into Sunday when apparent temperatures plunge into the -15F to -25F range. The extreme cold will begin to ease by Monday as boundary layer flow becomes S/SW and afternoon temperatures rise well into the 20s and perhaps lower 30s in some spots.

Barnes

AVIATION

(For the 18z TAFs through 18z Friday Afternoon) Issued at 1149 AM CST Thu Dec 11 2025

MVFR ceilings will generally prevail through the early afternoon ahead of the arrival of the accumulating snowfall. BMI is already seeing flurries occurring, which is indicating the dry layer aloft may be being overdone in the models. Once the snow overspreads the terminals from west to east starting after 19-20z near PIA/SPI and advancing to CMI/DEC by 23z, vis will dip to MVFR with pockets of IFR vis during any snow bursts. Based on the expected track of the system, there will be a 3-5 hour period of moderate to heavy snow with visbys down to 1/2 mile from late afternoon into the early to mid evening. The snow band will gradually shift eastward with time and visbys will improve by mid to late evening...with the snow completely ending at KSPI by 04z...then further northeast to KCMI by around 10z. Winds will initially be light southerly or variable, then will become E/SE this afternoon as the system approaches. Winds will then back to NE tonight. Ceilings will re

Shimon

ILX WATCHES/WARNINGS/ADVISORIES

Winter Weather Advisory from 3 PM this afternoon to 6 AM CST Friday for ILZ027>031-036>038-040>048-050>057-061>063-066>068- 073.