... Dense fog advisory in effect until 9 am CST Saturday...
The National Weather Service in Sioux Falls has issued a dense
fog advisory, which is in effect until 9 am CST Saturday.
* Weather conditions... occasional dense fog late this afternoon
will become more widespread through the overnight. Visibilities
will periodically fall to a quarter mile or less.
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: 2:41 PM CST Jan. 20, 2017 – National Weather Service