National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 142002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Mon Sep 14 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 low around 29.3 inches skirts by Lake Winnipeg into northern Ontario Monday night into early Tuesday, bringing 29.7 inch troughing over Lake Superior. 30.2 inch high pressure develops over the Northern Plains on Tuesday, strengthening to 30.4 inches as it crosses the Upper Great Lakes on Wednesday. High pressure ridging of 30.2 to 30.3 inches then looks to remain over Lake Superior through the rest of the workweek.

LSZ162-150800
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
401 PM EDT Mon Sep 14 2026 /301 PM CDT Mon Sep 14 2026/

GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY AFTERNOON

LATE THIS AFTERNOON
Southeast winds 15 to 25 knots. Showers and a slight chance of thunderstorms. Waves calm to 2 feet.

TONIGHT
Southeast winds 20 to 30 knots veering south after midnight, then becoming southwest gales to 35 knots late. Showers through midnight, then a slight chance of showers after midnight. Waves building to 3 to 6 feet occasionally to 8 feet.

TUESDAY
West gales to 45 knots diminishing to 20 to 30 knots late. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.

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

WEDNESDAY
North winds less than 10 knots becoming east 5 to 15 knots by mid afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
East winds 5 to 15 knots veering west after midnight. Waves calm to 2 feet.

THURSDAY
Northwest winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet.

THURSDAY NIGHT
Northeast winds 5 to 15 knots veering east after midnight. Waves calm to 2 feet.

FRIDAY
East winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet.

SATURDAY
Northeast winds 20 to 30 knots diminishing to 15 to 25 knots. A chance of showers. Waves building to 2 to 4 feet.

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LSZ263-150800
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 PM EDT Mon Sep 14 2026

GALE WARNING IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH TUESDAY EVENING

LATE THIS AFTERNOON
Southeast winds 15 to 25 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet.

TONIGHT
Southeast winds 20 to 30 knots veering south after midnight, then becoming southwest gales to 35 knots late. Showers and a slight chance of thunderstorms through midnight, then a slight chance of showers after midnight. Waves building to 4 to 7 feet occasionally to 9 feet.

TUESDAY
Southwest gales to 45 knots becoming west gales to 45 knots with a few storm force gusts to 50 knots possible in the afternoon, then diminishing to gales to 40 knots late. Waves building to 10 to 14 feet occasionally to 18 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.

TUESDAY NIGHT
West winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then becoming northwest 5 to 15 knots late. Waves subsiding to calm to 2 feet.

WEDNESDAY
North winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet.

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

THURSDAY
Northwest winds 5 to 15 knots. Waves calm to 2 feet.

THURSDAY NIGHT
Northeast winds 5 to 15 knots veering east after midnight. Waves calm to 2 feet.

FRIDAY
Southeast winds 5 to 15 knots becoming east 10 to 20 knots. A chance of showers. Waves calm to 2 feet.

SATURDAY
Northeast winds 20 to 30 knots. A chance of showers. Waves building to 2 to 4 feet.

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LSZ264-150800
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
401 PM EDT Mon Sep 14 2026

GALE WARNING IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH TUESDAY EVENING

LATE THIS AFTERNOON
Southeast winds 20 to 30 knots. Waves calm to 2 feet building to 2 to 4 feet.

TONIGHT
Southeast winds 20 to 30 knots becoming south gales to 35 knots after midnight, then diminishing to 20 to 30 knots late. Showers through midnight, then a chance of showers after midnight. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.

TUESDAY
Southwest gales to 45 knots becoming west gales to 45 knots with a few storm force gusts to 50 knots possible in the afternoon, then diminishing to gales to 45 knots late. Waves building to 10 to 14 feet occasionally to 18 feet, then subsiding to 8 to 11 feet occasionally to 14 feet.

TUESDAY NIGHT
West winds 20 to 30 knots diminishing to 10 to 20 knots after midnight, then becoming northwest 5 to 15 knots late. Waves subsiding to 1 to 3 feet.

WEDNESDAY
North winds less than 10 knots becoming southeast 5 to 15 knots by mid afternoon. Waves subsiding to calm to 2 feet.

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

THURSDAY
Northwest winds 5 to 15 knots. Waves calm to 2 feet.

THURSDAY NIGHT
North winds 5 to 15 knots veering east after midnight. Waves calm to 2 feet.

FRIDAY
Southeast winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves calm to 2 feet.

SATURDAY
Northeast winds 15 to 25 knots. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

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LSZ265-150800
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
401 PM EDT Mon Sep 14 2026

GALE WARNING IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH TUESDAY EVENING

LATE THIS AFTERNOON
Southeast winds 20 to 30 knots. Waves 1 to 3 feet building to 2 to 4 feet.

TONIGHT
South gales to 40 knots. Showers and a slight chance of thunderstorms through midnight, then a chance of showers after midnight. Waves building to 6 to 9 feet occasionally to 11 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

TUESDAY
Southwest gales to 40 knots becoming west gales to 45 knots in the afternoon. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.

TUESDAY NIGHT
West winds 20 to 30 knots diminishing to 15 to 25 knots after midnight, then becoming northwest 10 to 20 knots late. Waves subsiding to calm to 2 feet.

WEDNESDAY
Northwest winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
Southeast winds 10 to 20 knots veering southwest after midnight. Waves calm to 2 feet.

THURSDAY
West winds 10 to 20 knots veering north by mid afternoon. Waves calm to 2 feet.

THURSDAY NIGHT
North winds 10 to 20 knots veering east after midnight. Waves calm to 2 feet.

FRIDAY
Southeast winds 10 to 20 knots increasing to 15 to 25 knots. A chance of showers. Waves calm to 2 feet.

SATURDAY
East winds 15 to 25 knots becoming northeast 20 to 30 knots. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet.

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LSZ266-150800
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 PM EDT Mon Sep 14 2026

GALE WARNING IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH TUESDAY EVENING

LATE THIS AFTERNOON
Southeast winds 20 to 30 knots. Waves 1 to 3 feet building to 2 to 4 feet.

TONIGHT
South gales to 40 knots. Showers through midnight. A slight chance of thunderstorms. A chance of showers after midnight. Waves building to 7 to 11 feet occasionally to 14 feet.

TUESDAY
Southwest gales to 40 knots becoming west gales to 45 knots in the afternoon. Waves subsiding to 6 to 9 feet occasionally to 11 feet, then building to 10 to 14 feet occasionally to 18 feet.

TUESDAY NIGHT
West gales to 35 knots becoming northwest 15 to 25 knots after midnight, then diminishing to 10 to 20 knots late. Waves subsiding to 1 to 3 feet.

WEDNESDAY
North winds 5 to 15 knots veering east by mid afternoon. Waves subsiding to calm to 2 feet.

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

THURSDAY
West winds 10 to 20 knots veering northwest by mid afternoon. Waves calm to 2 feet.

THURSDAY NIGHT
North winds 10 to 20 knots veering east after midnight. Waves calm to 2 feet.

FRIDAY
Southeast winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves calm to 2 feet.

SATURDAY
East winds 15 to 25 knots becoming northeast 20 to 30 knots. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet.

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LSZ267-150800
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
401 PM EDT Mon Sep 14 2026

GALE WARNING IN EFFECT FROM 3 AM EDT TUESDAY THROUGH TUESDAY MORNING

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

TONIGHT
Southeast winds 20 to 30 knots becoming south gales to 40 knots after midnight. A slight chance of thunderstorms through midnight. Showers. Waves building to 6 to 9 feet occasionally to 11 feet.

TUESDAY
South gales to 35 knots becoming southwest 20 to 30 knots in the afternoon, then becoming west gales to 40 knots late. A slight chance of showers through early afternoon. Waves subsiding to 4 to 7 feet occasionally to 9 feet, then building to 7 to 10 feet occasionally to 13 feet.

TUESDAY NIGHT
West winds 20 to 30 knots becoming northwest 15 to 25 knots after midnight, then diminishing to 10 to 20 knots late. Waves subsiding to 2 to 4 feet.

WEDNESDAY
Northwest winds 5 to 15 knots veering north by mid afternoon. Waves subsiding to calm to 2 feet.

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

THURSDAY
Southwest winds 10 to 20 knots veering northwest by mid afternoon. Waves calm to 2 feet.

THURSDAY NIGHT
Northwest winds 10 to 20 knots veering northeast after midnight. Waves calm to 2 feet.

FRIDAY
Southeast winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet.

SATURDAY
East winds 15 to 25 knots backing northeast. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet.

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LSZ261-150200
MAFOR 1421/ Superior West...GALE WARNING IN EFFECT...11326 11336 11436 11540 12550 11660 11650. Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 4 to 7 feet building to 7 to 11 feet Tuesday.

Superior North Central...GALE WARNING IN EFFECT...12340 11456 11450 11440 11550 11570 11670. Waves 1 to 2 feet building to 6 to 10 feet tonight. Waves 6 to 10 feet building to 10 to 14 feet Tuesday.

Superior South Central...GALE WARNING IN EFFECT...11340 12456 12450 11550 11560 11660. Waves 2 to 3 feet building to 6 to 9 feet tonight. Waves 5 to 8 feet building to 6 to 10 feet Tuesday.

Superior East...GALE WARNING IN EFFECT...11320 11340 11446 12456 11450 11540 11650. Waves 1 to 3 feet building to 5 to 9 feet tonight. Waves 7 to 10 feet subsiding to 5 to 9 feet Tuesday.

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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