National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 072001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Thu May 7 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 remains over the lake until Friday morning associated with a pair of 29.4 inch lows (one over Labrador and one over Hudson Bay). The Hudson low drops a 29.6 inch trough over western Lake Superior Friday evening, passing over the rest of the lake overnight into Saturday morning. By Saturday evening, Lake Superior will be situated between a 29.5 inch low over western Quebec and a 30.2 inch high over Saskatchewan. By Sunday afternoon, the low will shift into central Quebec while the high moves over Lake Winnipeg. For Monday afternoon, the high builds to 30.3 inches and resides over Lake Superior. Meanwhile, Monday evening, a 29.7 inch low develops over the Northern Plains. This low passes through or near the Upper Great Lakes by Tuesday afternoon as the 30.1 inch high shifts east.

LSZ162-080800
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
401 PM EDT Thu May 7 2026 /301 PM CDT Thu May 7 2026/

LATE THIS AFTERNOON
Southwest winds 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet.

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

FRIDAY
Southwest winds 5 to 15 knots. A chance of rain showers by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
North winds 5 to 15 knots backing west 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 becoming west 5 to 15 knots by mid afternoon. A slight chance of rain showers through early afternoon, then sprinkles by mid afternoon. 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
Southeast winds 5 to 15 knots backing east. Waves calm to 2 feet.

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

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LSZ263-080800
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 Thu May 7 2026

LATE THIS AFTERNOON
Southwest winds 5 to 15 knots. Sprinkles. Waves calm to 2 feet.

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

FRIDAY
Southwest winds 5 to 15 knots. A chance of rain showers by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
Southwest winds 5 to 15 knots veering northwest late. A chance of rain showers. Waves calm to 2 feet.

SATURDAY
Northwest winds 5 to 15 knots backing west by mid afternoon. A chance of rain showers. Waves calm to 2 feet.

SATURDAY NIGHT
West winds 5 to 15 knots veering northwest after midnight. Waves building to 1 to 3 feet.

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

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

MONDAY
North winds 5 to 15 knots veering southeast. Waves calm to 2 feet.

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

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LSZ264-080800
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
401 PM EDT Thu May 7 2026

LATE THIS AFTERNOON
Southwest winds 5 to 15 knots. Waves calm to 2 feet.

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

FRIDAY
Southwest winds 5 to 15 knots. A chance of rain showers by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
South winds 5 to 15 knots veering southwest after midnight, then veering northwest late. A chance of rain showers. Flurries after midnight. Waves calm to 2 feet.

SATURDAY
North winds 5 to 15 knots backing west by mid afternoon. A slight chance of rain showers, possibly mixed with snow through early afternoon, then sprinkles and flurries by mid afternoon. 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
North winds 5 to 15 knots veering southeast. Waves calm to 2 feet.

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

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LSZ265-080800
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
401 PM EDT Thu May 7 2026

LATE THIS AFTERNOON
West winds 5 to 15 knots. Waves calm to 2 feet.

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

FRIDAY
Southwest winds 5 to 15 knots veering west in the afternoon, then backing south late. A chance of rain showers by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then veering west late. A chance of rain showers. Waves calm to 2 feet.

SATURDAY
Northwest winds 10 to 20 knots. A chance of rain showers. A slight chance of snow showers by mid afternoon. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

SATURDAY NIGHT
West winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Waves building to 1 to 3 feet.

SUNDAY
Northwest winds 15 to 25 knots. Waves subsiding to calm to 2 feet.

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

MONDAY
North winds 5 to 15 knots veering southeast. Waves calm to 2 feet.

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

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LSZ266-080800
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 Thu May 7 2026

LATE THIS AFTERNOON
West winds 5 to 15 knots. Waves calm to 2 feet.

TONIGHT
Southwest winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet.

FRIDAY
Southwest winds 5 to 15 knots backing south late. Sprinkles by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then veering west late. A chance of rain showers. Flurries after midnight. Waves calm to 2 feet.

SATURDAY
Northwest winds 10 to 20 knots. A chance of rain showers, possibly mixed with snow. Waves building to 2 to 4 feet.

SATURDAY NIGHT
Northwest winds 15 to 25 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding 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 calm to 2 feet.

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

TUESDAY
Southeast winds 10 to 20 knots backing east. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

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LSZ267-080800
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
401 PM EDT Thu May 7 2026

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

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

FRIDAY
Southwest winds 5 to 15 knots backing south in the afternoon, then veering southwest late. Sprinkles by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A chance of rain showers. Waves calm to 2 feet.

SATURDAY
Northwest winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. A chance of rain showers. A chance of snow showers by mid 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 calm to 2 feet.

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

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

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LSZ261-080200
MAFOR 0721/ Superior West 12510 12500 11510 11610 12510. Waves 2 feet or less.

Superior North Central 12510 13500 11510 11520 11510. Waves 1 to 2 feet.

Superior South Central 11600 11400 15500. Waves 1 foot or less.

Superior East 11600 12500 12510 13500. 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