National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 032100
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EST Tue Mar 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

A 30.1 inch trough will remain over the lake this afternoon with ridging of 30.2 inches building in tonight. A 30.6 inch high will move from northern Manitoba Wednesday to Quebec Thursday morning, building to 30.7 inches late. The strong high will help keep a 29.9 inch low moving up from the Southern Plains to the south of the Lower Great Lakes Wednesday night, wewakening to 30.1 inches by Thursday night. Friday, a low pressure ejects out of the Plains, reaching Lake Superior Saturday morning at least at 29.7 inches. Behind the low, a 29.9 inch ridge builds over the lake on Saturday night before a 29.1 inch low moves through northern Ontario on Sunday.

LSZ162-040900
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
400 PM EST Tue Mar 3 2026 /300 PM CST Tue Mar 3 2026/

LATE THIS AFTERNOON
West winds 10 to 20 knots. Waves calm to 2 feet.

TONIGHT
West winds 5 to 15 knots backing southwest by midnight. Waves calm to 2 feet.

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

WEDNESDAY NIGHT
South winds 10 to 20 knots backing northeast by midnight, then increasing to 15 to 25 knots late. Waves calm to 2 feet.

THURSDAY
Northeast winds 15 to 25 knots. Waves calm to 2 feet.

THURSDAY NIGHT
East winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet.

FRIDAY
East winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. A chance of rain showers in the morning, then rain showers likely in the afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
Northeast winds 10 to 20 knots backing north after midnight. A chance of rain showers. A chance of snow showers after midnight. Waves calm to 2 feet.

SATURDAY
West winds 15 to 25 knots becoming southwest 20 to 30 knots. Waves calm to 2 feet.

SUNDAY
Southwest winds 15 to 25 knots veering west. Waves calm to 2 feet.

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LSZ263-040900
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
400 PM EST Tue Mar 3 2026

LATE THIS AFTERNOON
West winds 5 to 15 knots. A slight chance of rain showers, freezing rain and snow showers. Waves calm to 2 feet.

TONIGHT
West winds 15 to 25 knots backing southwest by midnight. Waves calm to 2 feet.

WEDNESDAY
South winds 15 to 25 knots becoming southwest 10 to 20 knots by late morning, then diminishing to 5 to 15 knots by mid afternoon. Patchy fog in the morning. Waves calm to 2 feet.

WEDNESDAY NIGHT
Northeast winds 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

THURSDAY
Northeast winds 15 to 25 knots. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

THURSDAY NIGHT
East winds 15 to 25 knots becoming southeast 5 to 15 knots after midnight. Waves subsiding to 2 to 4 feet.

FRIDAY
Southeast winds 5 to 15 knots backing east in the afternoon. Rain showers likely in the afternoon. Waves subsiding to 1 to 3 feet.

FRIDAY NIGHT
East winds 5 to 15 knots becoming north 10 to 20 knots after midnight. A chance of rain showers. A chance of snow showers after midnight. Waves building to 2 to 4 feet.

SATURDAY
West winds 15 to 25 knots becoming southwest 20 to 30 knots. Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.

SUNDAY
Southwest winds 20 to 30 knots becoming west 15 to 25 knots. Waves subsiding to calm to 2 feet.

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LSZ264-040900
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
400 PM EST Tue Mar 3 2026

LATE THIS AFTERNOON
North winds 5 to 15 knots. A slight chance of rain showers, freezing rain and snow showers. Waves calm to 2 feet.

TONIGHT
North winds 5 to 15 knots diminishing to less than 10 knots by midnight, then backing west late. Waves calm to 2 feet.

WEDNESDAY
South winds 5 to 15 knots veering southwest by mid afternoon. Patchy fog in the morning. Waves calm to 2 feet.

WEDNESDAY NIGHT
Northeast winds 10 to 20 knots increasing to 15 to 25 knots by midnight. Waves building to 3 to 6 feet occasionally to 8 feet.

THURSDAY
East winds 15 to 25 knots diminishing to 10 to 20 knots in the afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

THURSDAY NIGHT
East winds 10 to 20 knots veering southeast after midnight. Waves 3 to 5 feet occasionally to 7 feet.

FRIDAY
Southeast winds 10 to 20 knots. A chance of rain showers in the afternoon. Waves subsiding to 2 to 4 feet.

FRIDAY NIGHT
Southeast winds 10 to 20 knots becoming northwest 15 to 25 knots after midnight. A chance of rain showers. A chance of snow showers after midnight. Waves building to 3 to 6 feet occasionally to 8 feet.

SATURDAY
Northwest winds 15 to 25 knots becoming southwest 20 to 30 knots. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.

SUNDAY
Southwest winds 20 to 30 knots becoming west 15 to 25 knots. Waves subsiding to 4 to 8 feet occasionally to 10 feet.

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LSZ265-040900
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
400 PM EST Tue Mar 3 2026

LATE THIS AFTERNOON
West winds 10 to 20 knots. A slight chance of rain and snow showers. Waves calm to 2 feet.

TONIGHT
Northwest winds 10 to 20 knots becoming west 5 to 15 knots late. Waves calm to 2 feet.

WEDNESDAY
South winds 5 to 15 knots increasing to 10 to 20 knots. Patchy fog in the morning. Waves calm to 2 feet.

WEDNESDAY NIGHT
Southeast winds 10 to 20 knots backing northeast by midnight. Waves building to 1 to 3 feet.

THURSDAY
East 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.

THURSDAY NIGHT
East winds 15 to 25 knots veering southeast after midnight. Waves subsiding to 2 to 4 feet.

FRIDAY
Southeast winds 15 to 25 knots. A chance of rain showers in the afternoon. Waves subsiding to 1 to 3 feet.

FRIDAY NIGHT
Southeast winds 15 to 25 knots veering west after midnight. Rain showers likely in the evening, then a chance of rain showers after midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.

SATURDAY
Northwest winds 20 to 30 knots backing southwest. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet.

SUNDAY
Southwest winds 20 to 30 knots veering west. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

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LSZ266-040900
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
400 PM EST Tue Mar 3 2026

LATE THIS AFTERNOON
West winds 10 to 20 knots. A slight chance of rain and snow showers. Waves calm to 2 feet.

TONIGHT
West winds 10 to 20 knots veering northwest by midnight, then backing west late. A slight chance of rain showers in the evening. Waves calm to 2 feet.

WEDNESDAY
South winds 10 to 20 knots. Patchy fog in the morning. Waves calm to 2 feet.

WEDNESDAY NIGHT
South winds 10 to 20 knots increasing to 15 to 25 knots by midnight, then backing east late. Waves building to 3 to 5 feet occasionally to 7 feet.

THURSDAY
East winds 15 to 25 knots. Waves 3 to 5 feet occasionally to 7 feet.

THURSDAY NIGHT
East winds 15 to 25 knots veering southeast after midnight. Waves 3 to 5 feet occasionally to 7 feet.

FRIDAY
Southeast winds 15 to 25 knots. A chance of rain showers in the afternoon. Waves subsiding to 2 to 4 feet.

FRIDAY NIGHT
Southeast winds 15 to 25 knots becoming west 20 to 30 knots after midnight. Rain showers likely. Waves building to 4 to 7 feet occasionally to 9 feet.

SATURDAY
Northwest winds 20 to 30 knots backing southwest. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

SUNDAY
Southwest winds 20 to 30 knots veering west. Waves subsiding to 5 to 8 feet occasionally to 10 feet, then building to 8 to 11 feet occasionally to 14 feet.

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LSZ267-040900
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
400 PM EST Tue Mar 3 2026

LATE THIS AFTERNOON
Southwest winds 10 to 20 knots. A slight chance of rain and snow showers. Waves calm to 2 feet.

TONIGHT
West winds 10 to 20 knots diminishing to 5 to 15 knots late. A slight chance of rain showers, possibly mixed with freezing rain and snow showers in the evening. Waves calm to 2 feet.

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

WEDNESDAY NIGHT
South winds 10 to 20 knots backing southeast late. Waves building to 1 to 3 feet.

THURSDAY
East winds 10 to 20 knots. Waves 1 to 3 feet.

THURSDAY NIGHT
East winds 15 to 25 knots veering southeast after midnight. Waves 1 to 3 feet.

FRIDAY
Southeast winds 15 to 25 knots. A chance of rain showers in the afternoon. Waves 1 to 3 feet.

FRIDAY NIGHT
Southeast winds 15 to 25 knots veering south after midnight. Rain showers. Waves building to 3 to 6 feet occasionally to 8 feet.

SATURDAY
West winds 15 to 25 knots becoming southwest 20 to 30 knots. A chance of rain showers. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

SUNDAY
Southwest winds 20 to 30 knots veering west. A chance of rain showers, possibly mixed with snow. Waves subsiding to 5 to 8 feet occasionally to 10 feet, then building to 8 to 11 feet occasionally to 14 feet.

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LSZ261-040300
MAFOR 0322/ Superior West 11610 12600 14500 11510. Waves omitted due to the lake being mostly ice covered.

Superior North Central 11810 11800 12700 11500 11400 11410 11510. Waves 2 feet or less. Wave heights are for ice free areas.

Superior South Central 11610 12700 11600 11500 11400 12410. Waves 1 foot or less. Wave heights are for ice free areas.

Superior East 12610 11710 11700 11600 11500 12410. Waves 1 to 2 feet.

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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