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Special Marine Warning — 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

severe

Severity as published by US National Weather Service.

Source

US National Weather Service — official source

Time

26 July 2026, 23:00 UTC (Jul 26, 2026)

Area

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, United States
47.477, -86.537

What this is

This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.

What to do

Follow the instructions issued by US National Weather Service and your local emergency services. The guidance below is background.

Who to contact

National Weather Service · FEMA · USGS Earthquake Hazards

This site is not an emergency service and does not issue warnings.

Location

No map is loaded here. A map means downloading image tiles from another service, which is the slowest thing on the full page and the first thing to fail on a weak connection. The coordinates are above if you need them.