... Dense fog advisory remains in effect until 10 am CST /11 am
* visibility... a quarter mile or less.
* Impacts... reduced visibilities will result in hazardous driving
conditions through early Saturday. Slick spots are likely on
some Road surfaces overnight, as temperatures fall to or below
freezing. This will be most likely west and north of Chicago,
and west of the Interstate 55 corridor across northern Illinois.
A dense fog advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving... slow down...
use your headlights... and leave plenty of distance ahead of you.
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Dense Fog Advisory
Issued: 9:32 PM EST Dec. 14, 2018 – National Weather Service