textproduct: Central Illinois
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
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 12z TAFs through 12z Sunday Morning) Issued at 553 AM CST Sat Dec 6 2025
MVFR ceilings are currently in place across central Illinois: however, ceilings will rise toward low VFR and a few breaks in the overcast will be observed from time to time from mid-morning into the afternoon. Winds will initially be NW at less than 10kt this morning, then will become SE during the afternoon/evening. As the flow takes on a southerly component, the RAP/HRRR suggest the MVFR ceilings will temporarily lift northward...allowing a period of VFR conditions at KSPI/KDEC/KCMI after the 22z-00z time period. Further north, low clouds will linger at both KPIA and KBMI...with a light rain/snow mix developing at KPIA by 05z and at KBMI by around 06z. As warmer air flows northward over the snow cover tonight, models are showing an IFR overcast developing at all central Illinois terminals after the 05z-09z period.
Barnes
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.
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