If you’re wondering what that smoke is to the south, I can’t tell you. However, according to scanner transmissions, whatever is causing the smoke is in Illinois.
If I find out more I’ll pass it on.
UPDATE 2:30 p.m. — Reader Andy Dietz reports WBBM radio is reporting the smoke was caused by a prescribed or controlled burn at Chain o’ Lakes State Park, located just south of Highway 173 west of Antioch.
Paul Brown shared this photo of the burn: