The National Weather Service issued two Special Marine Warnings on July 30, 2026: one by NWS Marquette, Michigan (2:07–2:15 PM EDT) and one by NWS Duluth, Minnesota (1:11–1:15 PM CDT), both covering Lake Superior waters near the US-Canada border.
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The affected areas were... 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... The thunderstorms have weakened and no longer pose a significant threat to boaters.
The affected areas were... Grand Marais to Taconite Harbor MN... Grand Portage to Grand Marais MN... Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM... The thunderstorm has weakened and no longer poses a significant threat to boaters. Additional storms may develop which could prompt warnings this afternoon.