textproduct: Central Illinois

KEY MESSAGES

- Winter storm conditions will persist into this evening before precipitation comes to an end toward midnight. - Storm total snowfall of 6 to 10 inches will be common everywhere north of the I-70 corridor. Further south, amounts will decrease sharply...with little to no accumulation across Richland and Lawrence counties.

- Another weaker system will spread snow into the region late Monday, resulting in additional light accumulations.

LONG TERM

(Monday through Next Saturday) Issued at 236 PM CST Sat Nov 29 2025

The next system of interest will quickly skirt through the region on Monday...bringing a period of light snow from Monday afternoon through Monday night. This will be a much weaker wave than the current one and deep-layer moisture will be considerably less: however, a light accumulation appears likely. The 12z NBM indicates a 70-90% chance of greater than 1 inch of snow along/north of a Taylorville to Paris line...with a 40-60% chance of more than 3 inches. Stay tuned for further details over the next few forecast cycles. After that, a cold and mainly dry week is expected. High temperatures will remain well below normal in the 20s and 30s...with Thursday being the coldest day when highs hover in the lower to middle 20s and overnight lows plunge into the single digits and teens.

Barnes

AVIATION

(For the 18z TAFs through 18z Sunday Afternoon) Issued at 1156 AM CST Sat Nov 29 2025

1730z/1130am radar shows a band of heavy snow lifting northward toward the I-74 corridor. Visbys beneath the band have been reduced to 1/4 to 1/2 mile...and am expecting these conditions to spread into KPIA/KBMI/KCMI over the next hour or so. Based on the latest radar trends and HRRR/RAP output, have ended the heaviest snow and raised visbys back up to 1 mile at KSPI by 22z...then further northeast to KBMI/KCMI by 00z. The snow will likely end as a light rain/snow mix at the I-72 terminals...with dry conditions returning across the board after the 03z-05z time frame. IFR ceilings will persist during the snowfall, with ceilings climbing to MVFR overnight into Sunday morning. Winds will initially be SE with gusts of 25-30kt this afternoon...then will become S/SW and decrease slightly this evening. Once low pressure lifts into the Great Lakes and pulls a cold front through the region, winds will veer to NW and once again gust 25-30kt from around midnight through Sunday morning.

Barnes

ILX WATCHES/WARNINGS/ADVISORIES

Winter Storm Warning until 6 AM CST Sunday for ILZ027>031- 036>038-040>057-061.

Winter Weather Advisory until 6 AM CST Sunday for ILZ062-063- 066>068-071>073.