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
- Comfortable and mostly dry through Wednesday: Generally pleasant conditions will persist across central Illinois, with only a low (20% to 30%) chance of isolated afternoon showers and storms.
- Heavy rain and localized flooding risk Thursday and Friday: A stalling weather front could bring widespread storms late this week (60% chance). While widespread severe weather is unlikely, heavy downpours will introduce a localized risk of flash flooding and isolated damaging wind gusts.
- Potential for intense heat by mid-July: A powerful high- pressure system building over the central United States may bring a prolonged period of dangerous, excessive heat to the region next week, though exact timing remains uncertain.
Extended Outlook (Saturday through Monday)
As the late-week boundary washes out, medium-range deterministic and ensemble guidance is in remarkably strong agreement regarding the building of a high-amplitude subtropical ridge over the central United States heading into the following week. While exact details regarding core amplitude and spatial positioning will inevitably fluctuate, long-range ensembles (GEFS/EPS/GEPS) consistently track an anomalous 600-mb upper- level high directly over the Rockies in the 7 to 10 day window (July 13-16).
The ultimate sensible weather impacts for central Illinois will hinge entirely on the placement of this ridge. If the local area remains on the eastern periphery of the high, active northwest flow would likely send periodic MCS ridge-riders through the region, which would act to temper the heat with cloud cover and convective debris. However, should the core of the ridge drift further east into the Corn Belt as some long- range members suggest, a prolonged period of dangerous, excessive heat would become increasingly likely for the middle of July.
AVIATION /12Z TAFS THROUGH 12Z TUESDAY/
Issued at 540 AM CDT Mon Jul 6 2026
Residual moisture trapped beneath a subsidence inversion is resulting in near-IFR ceilings across east central Illinois early this morning. These lower ceilings will lift diurnally to high MVFR by mid morning, and then back to VFR by early to mid afternoon. Winds will be from the northeast between 5 and 10 kts through the period.
ILX WATCHES/WARNINGS/ADVISORIES
None.
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