... Dense fog advisory in effect until 10 am CST Saturday...
The National Weather Service in Chicago has issued a dense fog
advisory... which is in effect until 10 am CST Saturday.
* Visibility... a half mile or less.
A dense fog advisory means visibilities will frequently be
reduced to less than one mile. Inexperienced mariners...
especially those operating smaller vessels should avoid
navigating in these conditions.
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Marine Fog Advisory
Issued: 2:59 PM CST Jan. 20, 2017 – National Weather Service