National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 080809 CCA
GLFLS

Open Lake Forecast for Lake Superior...CORRECTED
National Weather Service Marquette MI
409 AM EDT Thu Oct 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

Ridging steadily builds to 30.0 inches today as the 30.1 inch parent high digs from the Northern Plains into the Mid-Atlantic today and tonight. The parent high strengthens to 30.3 inches tonight, allowing ridging over Lake Superior to increase 30.2 inches. A 29.3 inch Clipper over southern Alberta on Friday night splits and creates a 29.4 inch low over the Northern Plains and Canadian Prairies by Saturday. This low is expected to bring 29.6 to 29.9 inch troughing back over Lake Superior on Saturday, which flattens out to around 29.8 inch troughing by Sunday as the low weakens to 29.6 inches near Lake Winnipeg by the end of the weekend. A subtle 29.7 inch shortwave low moves over the lake Sunday night and Monday.

LSZ162-082000
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
409 AM EDT Thu Oct 8 2026 /309 AM CDT Thu Oct 8 2026/

EARLY THIS MORNING
West winds 10 to 20 knots. Waves calm to 2 feet building to 1 to 3 feet.

TODAY
West winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

TONIGHT
West winds 5 to 15 knots becoming southwest less than 10 knots late. Waves calm to 2 feet.

FRIDAY
East winds less than 10 knots increasing to 10 to 20 knots. Waves calm to 2 feet.

FRIDAY NIGHT
East winds 10 to 20 knots veering southeast after midnight. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

SATURDAY
South winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

SATURDAY NIGHT
Southwest winds 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

SUNDAY
Southwest winds 10 to 20 knots becoming north 15 to 25 knots. Showers likely. Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.

MONDAY
North winds 15 to 25 knots. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

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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
409 AM EDT Thu Oct 8 2026

EARLY THIS MORNING
West winds 15 to 25 knots. Waves 3 to 5 feet occasionally to 7 feet.

TODAY
West winds 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.

TONIGHT
West winds 5 to 15 knots veering northwest after midnight, then backing southwest late. Waves subsiding to calm to 2 feet.

FRIDAY
South winds less than 10 knots becoming southeast 5 to 15 knots in the afternoon, then becoming east 10 to 20 knots late. Waves calm to 2 feet.

FRIDAY NIGHT
Southeast winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Waves building to 3 to 5 feet occasionally to 7 feet.

SATURDAY
South winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Waves subsiding to 2 to 4 feet.

SATURDAY NIGHT
Southwest winds 20 to 30 knots. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

SUNDAY
Southwest winds 15 to 25 knots veering north. A chance of showers. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.

MONDAY
North winds 20 to 30 knots. Rain showers likely. Waves building to 3 to 6 feet occasionally to 8 feet.

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

EARLY THIS MORNING
Northwest winds 15 to 25 knots. Waves 3 to 6 feet occasionally to 8 feet.

TODAY
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots late. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 2 to 4 feet.

TONIGHT
Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Sprinkles through midnight. Waves subsiding to calm to 2 feet.

FRIDAY
Northwest winds less than 10 knots backing southeast in the afternoon, then increasing to 5 to 15 knots late. Waves calm to 2 feet.

FRIDAY NIGHT
Southeast winds 15 to 25 knots. Waves building to 4 to 7 feet occasionally to 9 feet.

SATURDAY
Southeast winds 15 to 25 knots veering south by mid afternoon. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

SATURDAY NIGHT
South winds 20 to 30 knots veering southwest after midnight. Waves 3 to 6 feet occasionally to 8 feet.

SUNDAY
Southwest winds 15 to 25 knots veering north. Showers likely. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.

MONDAY
North winds 20 to 30 knots. Rain showers likely. Waves building to 3 to 6 feet occasionally to 8 feet.

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LSZ265-082000
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
409 AM EDT Thu Oct 8 2026

EARLY THIS MORNING
Northwest winds to 30 knots with a few gale force gusts to 35 knots possible. Sprinkles. Waves 3 to 6 feet occasionally to 8 feet building to 4 to 7 feet occasionally to 9 feet.

TODAY
Northwest winds to 30 knots with a few gale force gusts to 35 knots possible diminishing to 20 to 30 knots late. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.

TONIGHT
Northwest winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then backing west late. Sprinkles through midnight. Waves subsiding to calm to 2 feet.

FRIDAY
West winds 5 to 15 knots backing east in the afternoon, then increasing to 10 to 20 knots late. Waves calm to 2 feet.

FRIDAY NIGHT
Southeast winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Waves building to 3 to 6 feet occasionally to 8 feet.

SATURDAY
South winds 20 to 30 knots. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

SATURDAY NIGHT
South gales to 35 knots becoming southwest 20 to 30 knots after midnight. Waves subsiding to 2 to 4 feet.

SUNDAY
South winds 15 to 25 knots veering northwest. A chance of showers. Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.

MONDAY
North gales to 40 knots. Showers likely. Waves building to 5 to 8 feet occasionally to 10 feet.

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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
409 AM EDT Thu Oct 8 2026

EARLY THIS MORNING
Northwest winds 20 to 30 knots. A chance of showers. Waves 3 to 6 feet occasionally to 8 feet building to 4 to 7 feet occasionally to 9 feet.

TODAY
Northwest winds to 30 knots with a few gale force gusts to 35 knots possible diminishing to 20 to 30 knots late. A chance of showers. Waves building to 5 to 9 feet occasionally to 11 feet.

TONIGHT
Northwest winds 10 to 20 knots. A chance of showers through midnight. Waves subsiding to 1 to 3 feet.

FRIDAY
West winds 5 to 15 knots veering northwest in the afternoon, then becoming southeast 10 to 20 knots late. Waves subsiding to calm to 2 feet.

FRIDAY NIGHT
Southeast winds 15 to 25 knots increasing to 20 to 30 knots after midnight. Waves building to 4 to 7 feet occasionally to 9 feet.

SATURDAY
South winds 20 to 30 knots. Waves building to 4 to 8 feet occasionally to 10 feet.

SATURDAY NIGHT
South winds 20 to 30 knots. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

SUNDAY
South winds 15 to 25 knots veering southwest. A chance of showers. Waves subsiding to 2 to 4 feet.

MONDAY
North gales to 35 knots diminishing to 20 to 30 knots. A chance of showers. Waves building to 5 to 8 feet occasionally to 10 feet.

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

EARLY THIS MORNING
Northwest winds 20 to 30 knots. A chance of showers. Waves 3 to 6 feet occasionally to 8 feet building to 4 to 7 feet occasionally to 9 feet.

TODAY
Northwest winds 20 to 30 knots increasing to 30 knots with a few gale force gusts to 35 knots possible in the afternoon, then diminishing to 20 to 30 knots late. A chance of showers. Waves building to 8 to 11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.

TONIGHT
Northwest winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. A chance of showers through midnight. Waves subsiding to 1 to 3 feet.

FRIDAY
West winds 10 to 20 knots becoming northwest 5 to 15 knots in the afternoon, then veering east late. Waves subsiding to calm to 2 feet.

FRIDAY NIGHT
Southeast winds 10 to 20 knots increasing to 20 to 30 knots after midnight. Waves building to 3 to 6 feet occasionally to 8 feet.

SATURDAY
Southeast winds 20 to 30 knots veering south by mid afternoon. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

SATURDAY NIGHT
South gales to 35 knots diminishing to 20 to 30 knots after midnight. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

SUNDAY
South winds 15 to 25 knots veering southwest. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

MONDAY
North winds 20 to 30 knots. A chance of showers. Waves building to 5 to 8 feet occasionally to 10 feet.

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LSZ261-081400
MAFOR 0809/ Superior West 14620 12610 12600. Waves 1 to 3 feet.

Superior North Central 14740 11730 11720 11710 11700. Waves 3 to 6 feet building to 4 to 7 feet, then subsiding to 3 to 6 feet today. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight.

Superior South Central 12740 11740 19750 12740 11730 11720 11710. A chance of showers early this morning. Waves 5 to 8 feet today. Waves 4 to 7 feet subsiding to 1 to 3 feet tonight.

Superior East 11730 14740 11730 11720 11710. A chance of showers this morning. Waves 5 to 8 feet building to 6 to 9 feet today. Waves 6 to 9 feet subsiding to 3 to 5 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