Dense Fog Advisory and Heavy Rain for Chicago
Dense Fog Advisory and Heavy Rain for Chicago
US · Published Sep 29, 2026
• Chicago began Tuesday under a dense fog advisory, affecting counties to the north and west through 10 a.m.
• The National Weather Service warned of rapidly changing visibility during the morning commute.

Impact & Risks

The dense fog advisory poses risks for drivers during the morning commute, with low visibility and rapid changes in conditions. Heavy rain later in the week may lead to localized flooding in some areas, particularly during the Thursday morning commute, which is expected to be slick. Rainfall totals could exceed three inches in certain locations, increasing the risk of water accumulation on roads and low-lying areas. Travelers and residents should remain cautious and plan for potential disruptions.

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