... Dense fog advisory now in effect until midnight CST tonight...
* timing... widespread dense fog will occur through early evening.
Areas of fog will likely linger through the evening... especially
over the Illinois River valley.
* Visibility... a quarter mile or less at times.
* Impacts... fluctuations in visibilities will cause hazardous
A dense fog advisory means visibilities will frequently be
reduced to less than one half mile. If driving... slow down... use
your headlights... and leave plenty of distance ahead of you.
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Dense Fog Advisory
Issued: 5:07 PM CST Jan. 16, 2017 – National Weather Service