# Dense Fog Advisory: Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM; 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; Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border; Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore; Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border — retained record

> Retained us-gov-api record from us-gov-api:noaa-weather.

Canonical: https://highsignal.app/data/records/9e3e131b7951886d

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source: [us-gov-api](https://highsignal.app/data/us-gov-api) (us-gov-api:noaa-weather)  published 2026-07-27 04:12 ingested 2026-07-27 09:50

[original source ↗](http://www.weather.gov/)

## extract

Dense Fog Advisory — Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM; 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; Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border; Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore; Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
Severity: Minor. Certainty: Likely.
* WHAT...Dense fog will reduce visibility to less than one
nautical mile.

* WHERE...Lake Superior west of a line from Saxon Harbor WI to
Grand Portage MN beyond 5NM, 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, Lake
Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border, Lake
Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian
Border Beyond 5NM from shore and Lake Superior from Grand
Marais MI to Whitefish Point MI 5NM off shore to the
US/Canadian border.

* WHEN...Until noon EDT /11 AM CDT/ today.

* IMPACTS...Low visibility will make navigation difficult.

## retained text

The historical document was shared with another weather alert and cannot be attributed to this record. The original extract is preserved above; the exact alert link was not retained.