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Dense Fog Advisory
ActiveOntonagon to Upper Entrance of Portage Canal MI; Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park
Status
In Progress
Started about 1 hour ago
Ends
Issued
Severity
Minor
Urgency
Expected
Certainty
Likely
Details
* WHAT...For the Dense Fog Advisory, dense fog will reduce visibility to less than one nautical mile. For the Gale Warning, north winds 20 to 30 kt with gusts up to 40 kt and waves 8 to 13 ft expected.
* WHERE...Ontonagon to Upper Entrance of Portage Canal MI and Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park.
* WHEN...For the Dense Fog Advisory, until 10 AM EST this morning. For the Gale Warning, from 4 AM to 7 PM EST Thursday.
* IMPACTS...Strong winds will cause hazardous waves which could capsize or damage vessels and reduce visibility. Low visibility will make navigation difficult.
Instructions
Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous conditions.
If you must navigate, proceed with caution. Use proper fog signals. Make sure all running lights are on. Remember to use your radar and compass.
Data from the National Weather Service
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