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National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 080801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Fri May 8 2026

For waters beyond 5 nautical miles of shore on Lake Superior.

Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum.

SYNOPSIS

Weak troughing of around 29.8 inches this morning deepens to 29.6 inches by this evening thanks to a 29.8 inch low currently over the Black Hills phasing with a 29.3 inch low over Hudson Bay. This eventually creates a 29.5 inch low over Lake Superior Saturday morning that ejects eastward into Ontario and eventually western Quebec by Saturday afternoon. Meanwhile, a 30.1 inch high over the Canadian Prairies begins to push eastward on Saturday. With the high digging into the Northern Plains at 30.3 inches Saturday night into Sunday morning, expect the ridging over Lake Superior to steadily increase with time early next week. By Monday afternoon, the 30.3 inch high moves over the western Great Lakes. In its wake, a 29.7 inch Clipper low digs through the Canadian Prairies into the Upper Midwest, arriving over the Upper Mississippi Valley by Tuesday.

LSZ162-082000
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
401 AM EDT Fri May 8 2026 /301 AM CDT Fri May 8 2026/

EARLY THIS MORNING
Southwest winds 5 to 15 knots. Waves calm to 2 feet.

TODAY
Southwest winds 5 to 15 knots. Sprinkles by mid afternoon. Waves calm to 2 feet.

TONIGHT
North winds 5 to 15 knots backing west after midnight, then becoming northwest 10 to 20 knots late. A chance of rain showers through midnight. Waves calm to 2 feet.

SATURDAY
Northwest winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves calm to 2 feet.

SATURDAY NIGHT
Northwest winds 10 to 20 knots. Waves calm to 2 feet.

SUNDAY
Northwest winds 10 to 20 knots becoming west 5 to 15 knots by mid afternoon. Waves calm to 2 feet.

SUNDAY NIGHT
Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet.

MONDAY
South winds 5 to 15 knots backing east. Waves calm to 2 feet.

TUESDAY
East winds 10 to 20 knots becoming north 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet.

LSZ263-082000
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
401 AM EDT Fri May 8 2026

EARLY THIS MORNING
Southwest winds 5 to 15 knots. Waves calm to 2 feet.

TODAY
Southwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. Waves building to 1 to 3 feet.

TONIGHT
Southwest winds 5 to 15 knots veering northwest late. A chance of rain showers through midnight. Waves subsiding to calm to 2 feet.

SATURDAY
Northwest winds 5 to 15 knots backing west in the afternoon. Waves calm to 2 feet.

SATURDAY NIGHT
Northwest winds 5 to 15 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

SUNDAY
Northwest winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet.

SUNDAY NIGHT
West winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet.

MONDAY
South winds 5 to 15 knots backing southeast. Waves calm to 2 feet.

TUESDAY
East winds 5 to 15 knots backing north. A chance of rain showers. Waves calm to 2 feet.

LSZ264-082000
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
401 AM EDT Fri May 8 2026

EARLY THIS MORNING
Southwest winds 5 to 15 knots. Waves calm to 2 feet.

TODAY
Southwest winds 5 to 15 knots. Waves building to 1 to 3 feet.

TONIGHT
South winds 5 to 15 knots becoming southwest less than 10 knots after midnight, then becoming north 5 to 15 knots late. Sprinkles through midnight. Waves subsiding to calm to 2 feet.

SATURDAY
North winds 5 to 15 knots backing west late. Waves calm to 2 feet.

SATURDAY NIGHT
West winds 5 to 15 knots veering northwest after midnight. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

SUNDAY
Northwest winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet.

SUNDAY NIGHT
Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet.

MONDAY
Northwest winds 5 to 15 knots backing south. Waves calm to 2 feet.

TUESDAY
Southeast winds 5 to 15 knots backing east. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

LSZ265-082000
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
401 AM EDT Fri May 8 2026

EARLY THIS MORNING
Southwest winds 10 to 20 knots. Waves calm to 2 feet.

TODAY
Southwest winds 10 to 20 knots backing south late. Waves calm to 2 feet.

TONIGHT
South winds 10 to 20 knots veering west late. A chance of rain showers. Waves calm to 2 feet.

SATURDAY
Northwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.

SATURDAY NIGHT
West winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Waves subsiding to calm to 2 feet.

SUNDAY
Northwest winds 15 to 25 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

SUNDAY NIGHT
Northwest winds 10 to 20 knots. Waves calm to 2 feet.

MONDAY
Northwest winds 5 to 15 knots backing southeast. Waves calm to 2 feet.

TUESDAY
Southeast winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet.

LSZ266-082000
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
401 AM EDT Fri May 8 2026

EARLY THIS MORNING
Southwest winds 10 to 20 knots. Waves calm to 2 feet.

TODAY
Southwest winds 5 to 15 knots backing south late. Waves calm to 2 feet.

TONIGHT
South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then becoming northwest 10 to 20 knots late. A chance of rain showers. Waves calm to 2 feet.

SATURDAY
Northwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.

SATURDAY NIGHT
Northwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

SUNDAY
Northwest winds 15 to 25 knots. Waves 2 to 4 feet.

SUNDAY NIGHT
Northwest winds 10 to 20 knots. Waves subsiding to 1 to 3 feet.

MONDAY
Northwest winds 5 to 15 knots backing south. Waves subsiding to calm to 2 feet.

TUESDAY
Southeast winds 10 to 20 knots becoming east 5 to 15 knots. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet.

LSZ267-082000
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
401 AM EDT Fri May 8 2026

EARLY THIS MORNING
Southwest winds 5 to 15 knots. Waves calm to 2 feet.

TODAY
Southwest winds 5 to 15 knots backing south late. Waves calm to 2 feet.

TONIGHT
South winds 10 to 20 knots. A chance of rain showers. Flurries after midnight. Waves calm to 2 feet.

SATURDAY
Northwest winds 10 to 20 knots increasing to 20 to 30 knots late. Sprinkles through early afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.

SATURDAY NIGHT
Northwest winds 20 to 30 knots diminishing to 10 to 20 knots after midnight. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.

SUNDAY
Northwest winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

SUNDAY NIGHT
Northwest winds 15 to 25 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.

MONDAY
Northwest winds 5 to 15 knots backing south. Waves subsiding to calm to 2 feet.

TUESDAY
Southeast winds 5 to 15 knots backing east. Waves calm to 2 feet.

LSZ261-081400
MAFOR 0809/ Superior West 11500 14510 11400 12600. Waves 2 feet or less.

Superior North Central 11500 14510 11410 11400 11700. Waves 1 to 3 feet.

Superior South Central 12510 11500 11510 13410 11510. A chance of rain showers overnight. Waves 2 feet or less.

Superior East 12510 12500 11400 11410 11420 11410. A chance of rain showers overnight. Waves 1 to 2 feet.

WFO MQT

Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable

Graphical marine forecasts are available online at: weather.gov/greatlakes