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

- Heat Returns Midweek: Hot and muggy conditions return Tuesday and Wednesday. Temperatures will top out in the 90s both days. There is a 50-80% chance of heat indices greater than 95 degrees south of I-70 Wednesday afternoon.

- Midweek Storm Potential: A passing front brings a 70-90% chance for showers and thunderstorms Wednesday into Thursday. SPC has a marginal (level 1 of 5) risk for severe weather south of a Jacksonville to Hoopeston line.

DISCUSSION

Issued at 202 AM CDT Mon Sep 7 2026

Today highs will be in the 80s to near 90. Temperatures will warm back up into the 90s tomorrow and Wednesday as the upper ridging builds back eastward with 850 mb temperatures of 20-24C. Moisture transport will increase into Wednesday ahead of a cold front bringing soupy dewpoints (70-75F) into the central part of the state. There is a 50-80% chance of heat indices greater than 95 degrees south of I-70 Wednesday afternoon, from the LREF.

The cold front will move through on Wednesday as the ridge gets broken down by an upper low moving over Canada. It will clear out the sweltering mid to upper 90 temperatures, leaving highs in the low to mid 80s before building back to upper 80s to low 90s for the weekend.

This front will bring the next chance for rain Wednesday into Thursday. CAMs are now within reach of Wednesday morning. The NAMNest and the RRFS are showing a line of showers & convection along the front entering the northwest around 12z Wednesday. The RRFS suggests the initial line of convection will dry out during the day. Then some redevelopment in the southeast in the evening, potentially training near and south of I-70. PWATs in that area are forecast to be 2.0-2.5 inches. WPC has a marginal risk ERO south of I-72 and SPC has added a marginal risk for severe weather south of a Jacksonville to Hoopeston line for Wednesday. Damaging winds are the most likely hazard with the line of storms.

Additional low-end chances exist for showers and thunderstorms through the weekend.

AVIATION /12Z TAFS THROUGH 12Z TUESDAY/

Issued at 555 AM CDT Mon Sep 7 2026

VFR conditions are expected through the 12z TAF period. Any cloud cover today should be high based. Light, easterly winds will be in place.

ILX WATCHES/WARNINGS/ADVISORIES

None.

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