National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 030801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Mon Aug 3 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

Ridging of 29.9 inches over Lake Superior early this morning shifts southeast today as 29.7 to 29.8 inch troughing approaches from the west. The trough moves over the lake at 29.8 inches tonight into Tuesday as a 29.4 inch low tracks over Hudson Bay. 30.0 inch ridging returns on Wednesday as high pressure builds into the Great Lakes from the northern Plains. For the late week and into the weekend, Lake Superior will be between a 30.3 inch Bermuda High and a 29.6 inch low pressure around western Hudson Bay.

LSZ162-032000
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
401 AM EDT Mon Aug 3 2026 /301 AM CDT Mon Aug 3 2026/

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

TODAY
East winds 5 to 15 knots. Waves calm to 2 feet.

TONIGHT
East winds 5 to 15 knots becoming south 15 to 25 knots after midnight, then veering southwest late. A chance of showers and a slight chance of thunderstorms after midnight. Waves building to 2 to 4 feet.

TUESDAY
West winds 15 to 25 knots diminishing to 10 to 20 knots in the afternoon, then increasing to 15 to 25 knots late. A slight chance of showers through early afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

TUESDAY NIGHT
West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.

WEDNESDAY
Southwest winds 5 to 15 knots becoming south 10 to 20 knots by mid afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
South winds 5 to 15 knots veering southwest after midnight. Waves calm to 2 feet.

THURSDAY
Southwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves calm to 2 feet.

FRIDAY
Southwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves calm to 2 feet.

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LSZ263-032000
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 Mon Aug 3 2026

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

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

TONIGHT
Southeast winds 10 to 20 knots becoming south 15 to 25 knots after midnight, then veering southwest late. A chance of showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet.

TUESDAY
West winds 15 to 25 knots backing southwest late. A slight chance of showers through early afternoon. Waves subsiding to 2 to 4 feet.

TUESDAY NIGHT
West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.

WEDNESDAY
Southwest winds 10 to 20 knots. Waves building to 1 to 3 feet.

WEDNESDAY NIGHT
South winds 10 to 20 knots becoming southwest 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.

THURSDAY
Southwest winds 15 to 25 knots diminishing to 10 to 20 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

FRIDAY
Southwest winds 10 to 20 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

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LSZ264-032000
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
401 AM EDT Mon Aug 3 2026

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

TODAY
South winds 5 to 15 knots backing southeast in the afternoon. Waves calm to 2 feet.

TONIGHT
Southeast winds 10 to 20 knots veering south after midnight, then increasing to 15 to 25 knots late. Waves building to 2 to 4 feet.

TUESDAY
Southwest winds 15 to 25 knots. A slight chance of showers through early afternoon. Waves 2 to 4 feet.

TUESDAY NIGHT
West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.

WEDNESDAY
Southwest winds 5 to 15 knots. Waves calm to 2 feet.

WEDNESDAY NIGHT
South winds 5 to 15 knots. Waves calm to 2 feet.

THURSDAY
Southwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

FRIDAY
Southwest winds 10 to 20 knots. Waves calm to 2 feet.

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LSZ265-032000
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
401 AM EDT Mon Aug 3 2026

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

TODAY
South winds 5 to 15 knots becoming southeast 10 to 20 knots in the afternoon, then increasing to 15 to 25 knots late. Waves calm to 2 feet.

TONIGHT
Southeast winds 15 to 25 knots veering south after midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.

TUESDAY
South winds 15 to 25 knots veering west in the afternoon, then diminishing to 10 to 20 knots late. A slight chance of showers. Waves subsiding to calm to 2 feet.

TUESDAY NIGHT
West winds 10 to 20 knots. Waves calm to 2 feet.

WEDNESDAY
West winds 10 to 20 knots becoming south 5 to 15 knots by mid afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
South winds 10 to 20 knots. Waves calm to 2 feet.

THURSDAY
South winds 10 to 20 knots veering southwest. Waves calm to 2 feet.

FRIDAY
Southwest winds 10 to 20 knots. Waves calm to 2 feet.

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LSZ266-032000
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 Mon Aug 3 2026

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

TODAY
South winds 5 to 15 knots backing southeast in the afternoon, then increasing to 10 to 20 knots late. Waves calm to 2 feet.

TONIGHT
Southeast winds 15 to 25 knots veering south after midnight, then increasing to 20 to 30 knots late. Waves building to 2 to 4 feet.

TUESDAY
South winds 20 to 30 knots becoming southwest 15 to 25 knots in the afternoon, then becoming west 10 to 20 knots late. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

TUESDAY NIGHT
West winds 5 to 15 knots. A slight chance of showers. Waves subsiding to calm to 2 feet.

WEDNESDAY
West winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet.

THURSDAY
South winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 1 to 3 feet.

FRIDAY
Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves subsiding to calm to 2 feet.

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LSZ267-032000
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
401 AM EDT Mon Aug 3 2026

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

TODAY
South winds less than 10 knots veering west in the afternoon, then becoming east 5 to 15 knots late. Waves calm to 2 feet.

TONIGHT
Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight, then increasing to 15 to 25 knots late. Waves building to 2 to 4 feet.

TUESDAY
South winds 15 to 25 knots veering southwest in the afternoon, then becoming west 5 to 15 knots late. A chance of showers and a slight chance of thunderstorms by mid afternoon. Waves subsiding to calm to 2 feet.

TUESDAY NIGHT
Southwest winds 5 to 15 knots veering west after midnight. A slight chance of showers. Waves calm to 2 feet.

WEDNESDAY
West winds 5 to 15 knots. Waves calm to 2 feet.

WEDNESDAY NIGHT
Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet.

THURSDAY
South winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 1 to 3 feet.

FRIDAY
Southwest winds 5 to 15 knots backing south. Waves subsiding to calm to 2 feet.

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LSZ261-031400
MAFOR 0309/ Superior West 12300 11400 11200 11210 11310 11420 11430. Waves 1 foot or less today. Waves 1 to 3 feet tonight.

Superior North Central 11300 11400 13310 11320 12420. Waves 2 feet or less today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

Superior South Central 12400 11310 12320 11330 12430. Waves 2 feet or less today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

Superior East 11200 11300 12400 11300 11310 12420. Waves 1 foot or less today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

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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