textproduct: Central Illinois

KEY MESSAGES

- There is a medium (30-50%) chance of light rain Friday afternoon into Friday night, mainly south of a line from Macomb to Paris.

- Dangerous heat builds Sunday and Monday, with afternoon heat index values nearing 105 F across the area.

- A low-probability, but high impact pattern will evolve by late Sunday through Monday night, which could bring severe storms and heavy rainfall to portions of central Illinois.

Tuesday through Mid-next Week

Relief arrives Tuesday as the cold front pushes south of central Illinois, scouring out the high humidity and returning dewpoints to the 60s. High temperatures will recede back into the mid-to-upper 80s, effectively lowering the overall heat risk. While northwest flow in the wake of the departing trough will need to be watched for any upstream migratory shortwaves, strong ensemble consensus points toward a stretch of dry and seasonably warm weather prevailing through mid-week.

AVIATION /12Z TAFS THROUGH 12Z FRIDAY/

Issued at 500 AM CDT Thu Jul 23 2026

VFR conditions will persist through this TAF period as surface high pressure slowly builds across the regional terminals, keeping skies fair and winds light.

Clouds will thicken and lower overnight as a disturbance tracks across the Central Plains and into the lower Missouri Valley.

ILX WATCHES/WARNINGS/ADVISORIES

None.