National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 120801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Thu Jun 12 2025

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

Throughout this morning, a 30.3 inch high over northern Manitoba shifts to northern Ontario, extending 30.2 inch ridging over Lake Superior. The high reaches James Bay by Friday afternoon, maintaining strength with 30.2 ridging remaining over the lake through the weekend. Monday, high pressure shifts east of the Great Lakes while a broad low pressure of 29.7 inches moves over the Plains, with the low arriving over the Great Lakes late Monday into early Tuesday morning.

LSZ162-122000
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
401 AM EDT Thu Jun 12 2025 /301 AM CDT Thu Jun 12 2025/

EARLY THIS MORNING
Northeast winds 10 to 20 knots. Waves calm to 2 feet.

TODAY
Northeast winds 10 to 20 knots. Waves building to 2 to 4 feet.

TONIGHT
Northeast winds 10 to 20 knots veering east late. A chance of showers. Waves 2 to 4 feet.

FRIDAY
East winds 10 to 20 knots becoming northeast 15 to 25 knots in the afternoon. Showers likely through early afternoon, then a chance of showers by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.

FRIDAY NIGHT
Northeast winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. A chance of showers. Waves subsiding to 1 to 3 feet.

SATURDAY
Northeast winds 10 to 20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

SATURDAY NIGHT
Northeast winds 5 to 15 knots. Waves calm to 2 feet.

SUNDAY
East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet.

MONDAY
East winds 5 to 15 knots. A chance of showers and thunderstorms. Waves calm to 2 feet.

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LSZ263-122000
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 Thu Jun 12 2025

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

TODAY
Northeast winds 5 to 15 knots veering east late. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.

TONIGHT
East winds 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

FRIDAY
East winds 5 to 15 knots backing northeast in the afternoon, then increasing to 10 to 20 knots late. A chance of showers. Waves building to 1 to 3 feet.

FRIDAY NIGHT
East winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A chance of showers. Waves subsiding to calm to 2 feet.

SATURDAY
Northeast winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet.

SATURDAY NIGHT
Northeast winds 5 to 15 knots becoming east less than 10 knots after midnight. Waves calm to 2 feet.

SUNDAY
East winds 5 to 15 knots veering southwest. Waves calm to 2 feet.

MONDAY
South winds 5 to 15 knots veering southwest. A chance of showers and thunderstorms. Waves calm to 2 feet.

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LSZ264-122000
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
401 AM EDT Thu Jun 12 2025

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

TODAY
North winds 5 to 15 knots veering northeast in the afternoon, then veering south late. Waves calm to 2 feet.

TONIGHT
East winds 5 to 15 knots diminishing to less than 10 knots after midnight. A slight chance of rain showers after midnight. Waves calm to 2 feet.

FRIDAY
East winds less than 10 knots increasing to 5 to 15 knots in the afternoon. A chance of showers. Waves calm to 2 feet.

FRIDAY NIGHT
East winds 5 to 15 knots. A slight chance of rain showers. Waves calm to 2 feet.

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

SATURDAY NIGHT
East winds 5 to 15 knots becoming west less than 10 knots after midnight. Waves calm to 2 feet.

SUNDAY
Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet.

MONDAY
South winds 5 to 15 knots backing southeast. A chance of showers. Waves calm to 2 feet.

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LSZ265-122000
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
401 AM EDT Thu Jun 12 2025

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

TODAY
North winds 5 to 15 knots veering east late. Waves calm to 2 feet.

TONIGHT
Southeast winds 5 to 15 knots backing east after midnight, then veering southeast late. A chance of rain showers after midnight. Waves calm to 2 feet.

FRIDAY
East winds 5 to 15 knots increasing to 10 to 20 knots late. Showers likely through early afternoon, then a chance of showers by mid afternoon. Waves calm to 2 feet.

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

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

SATURDAY NIGHT
Northeast winds 5 to 15 knots backing north after midnight. Waves calm to 2 feet.

SUNDAY
East winds 5 to 15 knots veering south. Waves calm to 2 feet.

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

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LSZ266-122000
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 Thu Jun 12 2025

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

TODAY
North winds 5 to 15 knots backing northwest late. Waves calm to 2 feet.

TONIGHT
Northwest winds 5 to 15 knots veering northeast after midnight, then veering east late. A chance of rain showers after midnight. Waves calm to 2 feet.

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

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

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

SATURDAY NIGHT
Northeast winds 5 to 15 knots backing north after midnight. Waves calm to 2 feet.

SUNDAY
North winds 5 to 15 knots veering south. Waves calm to 2 feet.

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

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LSZ267-122000
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
401 AM EDT Thu Jun 12 2025

EARLY THIS MORNING
North winds 10 to 20 knots. Waves calm to 2 feet.

TODAY
North winds 10 to 20 knots becoming northwest 5 to 15 knots in the afternoon. Waves calm to 2 feet.

TONIGHT
Northwest winds 5 to 15 knots veering north after midnight, then veering east late. A chance of rain showers 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 showers. Waves calm to 2 feet.

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

SATURDAY
East winds 10 to 20 knots backing northeast by mid afternoon. A chance of showers. Waves calm to 2 feet.

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

SUNDAY
North winds 5 to 15 knots veering south. Waves calm to 2 feet.

MONDAY
East winds 5 to 15 knots becoming south 10 to 20 knots. A chance of showers. Waves calm to 2 feet.

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LSZ261-121400
MAFOR 1209/ Superior West 11210 14110 11110 12210. A chance of showers overnight. Waves 1 to 3 feet.

Superior North Central 12800 11100 11200 11300 11400 11300 11200. Waves 2 feet or less.

Superior South Central 12800 12100 11200 11400 11300 11200. Waves 1 foot or less.

Superior East 13800 13700 11800 11100. 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