AI Summary

A heat advisory issued at 2 p.m. CDT on September 18 warns that heat index values will reach up to 105. The advisory covers several Illinois counties—Fayette, Montgomery, Calhoun, Greene, Jersey and Macoupin—and Missouri counties—Boone, Callaway, Lincoln and Montgomery. It remains in effect until 8 p.m. CDT this evening. Officials note that the combination of hot temperatures and high humidity could lead to heat‑related illnesses. Residents in the affected areas are advised to take precautions to stay cool and hydrated.

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