* WHAT...Dense fog will reduce visibility to 1/4 NM or less.
* WHERE...Grand Portage to Grand Marais MN, Grand Marais to Taconite Harbor MN, Taconite Harbor to Silver Bay Harbor MN and Silver Bay Harbor to Two Harbors MN.
* WHEN...Until 10 AM CDT Friday.
* IMPACTS...Low visibility will make navigation difficult.
* ADDITIONAL DETAILS...Visibility improved for several hours this afternoon, but is beginning to spread again early this evening.