CHICAGO (STMW) – The National Weather Service is warning of dense fog that could reduce visibility to near zero in the Chicago metro area through the morning rush hour Tuesday.

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As of 3:27 a.m., the National Weather Service warned of hazardous weather in north-central north-east Illinois and northwest Indiana. Areas of dense fog will reduce visibility to near zero in spots south of I-80 through the mid morning.

Extra caution and increased following distance should be used for those traveling in Cook, Lake, McHenry, Will, DuPage and many other counties in Illinois, as well as Lake and Porter counties in Indiana, the weather service said.

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