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
- Muggy conditions return Tuesday, followed by widespread showers and thunderstorms Wednesday night into Thursday across central Illinois.
- There is a low risk for severe storms Wednesday evening, mainly near and north of the Illinois River Valley, with damaging winds as the main threat.
- Hot and humid weather returns early next week with heat index values approaching 100 degrees, though passing storm complexes could occasionally temper the heat.
Long Term (Saturday through Early Next Week)
As we head into the weekend, ensemble and multimodal guidance depict considerably more noise than signal regarding additional precipitation chances. Ultimately, the broader synoptic pattern supports a return to drier weather by Saturday. Subsidence will work in behind the departing mid-week shortwave energy, allowing the prominent upper-level heat ridge anchored off to our west to expand back eastward into the Mid-Mississippi River Valley.
As the ridge builds in, uncomfortable summertime heat seems poised to make a return. Highs will push back into the low 90s, and with lingering boundary layer moisture, heat index values will creep back near the 100-degree mark by early next week. The one major caveat to this heat will be our position on the periphery of the ridge. There is more than a remote possibility that subtle wrinkles in the mid-level flow crest the ridge, bringing thunderstorm complexes (a classic "ring of fire" setup) into central Illinois. Should these complexes materialize, they would easily thwart the heat forecast, making temperature trends highly dependent on mesoscale convective trends early next week.
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
Issued at 1131 AM CDT Mon Aug 3 2026
Afternoon cumulus will lift and break for clear skies beyond 00z. Patchy fog is a low probability overnight, but have added a tempo group for MVFR visibility Tuesday morning as a hedge. Otherwise, VFR conditions and light winds will remain intact through the TAF period as a ridge/high-pressure slowly build across the regional terminals.
ILX WATCHES/WARNINGS/ADVISORIES
None.
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