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National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 120801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sun Jul 12 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

High pressure of 30.1 inches is draped from Quebec to the Upper Great Lakes this morning. This surface high then shifts south toward the lower Great Lakes as pressure falls over the lake to 29.9 inches by Sunday night. Early next week a strong low of around 29.3 inches tracks northeast from the Northern Plains toward Hudson Bay, keeping pressure over Lake Superior at 29.9 inches through Tuesday morning. Wednesday, high pressure extending from the Canadian Prairies to the southern Appalachians weakens slightly as the Canadian low deepens to 29.1 inches in northern Quebec. Lake Superior remains under weak high pressure Wednesday into Thursday at 30.0 inches.

LSZ162-122000
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
400 AM EDT Sun Jul 12 2026 /300 AM CDT Sun Jul 12 2026/

EARLY THIS MORNING
Southwest winds 5 to 15 knots. A chance of showers and thunderstorms. Waves calm to 2 feet.

TODAY
Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. Waves building to 2 to 4 feet.

TONIGHT
Southwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet.

MONDAY
Southwest winds 10 to 20 knots increasing to 20 to 30 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

MONDAY NIGHT
Southwest winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.

TUESDAY
West winds 15 to 25 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to calm to 2 feet.

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

WEDNESDAY
North winds 5 to 15 knots. Waves calm to 2 feet.

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

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
400 AM EDT Sun Jul 12 2026

EARLY THIS MORNING
Southwest winds 10 to 20 knots. A slight chance of showers and thunderstorms. Waves calm to 2 feet.

TODAY
Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. A slight chance of showers and thunderstorms through early afternoon. Waves building to 2 to 4 feet.

TONIGHT
Southwest winds 15 to 25 knots veering west late. Waves building to 3 to 5 feet occasionally to 7 feet.

MONDAY
Southwest winds 10 to 20 knots increasing to 20 to 30 knots. Waves subsiding to 2 to 4 feet, then building to 4 to 7 feet occasionally to 9 feet.

MONDAY NIGHT
Southwest winds 20 to 30 knots veering west after midnight. Waves 4 to 7 feet occasionally to 9 feet.

TUESDAY
West winds 15 to 25 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.

TUESDAY NIGHT
Northwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet.

WEDNESDAY
Southwest winds 5 to 15 knots veering west. Waves calm to 2 feet.

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

LSZ264-122000
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
400 AM EDT Sun Jul 12 2026

EARLY THIS MORNING
Southwest winds 5 to 15 knots. A slight chance of showers and thunderstorms. Waves calm to 2 feet.

TODAY
Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. A chance of showers and a slight chance of thunderstorms through early afternoon. Waves building to 2 to 4 feet.

TONIGHT
Southwest winds 10 to 20 knots increasing to 15 to 25 knots after midnight, then veering west late. A slight chance of showers through midnight. Waves building to 3 to 5 feet occasionally to 7 feet.

MONDAY
West winds 10 to 20 knots becoming southwest 15 to 25 knots in the afternoon, then increasing to 20 to 30 knots late. Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet.

MONDAY NIGHT
Southwest winds 20 to 30 knots veering west after midnight. Waves building to 4 to 8 feet occasionally to 10 feet.

TUESDAY
West winds 20 to 30 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.

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

WEDNESDAY
West winds 5 to 15 knots. Waves calm to 2 feet.

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

LSZ265-122000
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
400 AM EDT Sun Jul 12 2026

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

TODAY
Southwest winds 10 to 20 knots backing south in the afternoon. A slight chance of showers and thunderstorms. Waves calm to 2 feet.

TONIGHT
South winds 10 to 20 knots becoming southwest 15 to 25 knots after midnight, then veering west late. Waves building to 2 to 4 feet.

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

MONDAY NIGHT
Southwest winds 15 to 25 knots becoming west 20 to 30 knots after midnight. Waves building to 3 to 5 feet occasionally to 7 feet.

TUESDAY
West winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. Waves subsiding to calm to 2 feet.

TUESDAY NIGHT
West winds 10 to 20 knots veering northwest after midnight. Waves calm to 2 feet.

WEDNESDAY
Northwest winds 5 to 15 knots backing west. Waves calm to 2 feet.

THURSDAY
North winds 5 to 15 knots backing west. Waves calm to 2 feet.

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
400 AM EDT Sun Jul 12 2026

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

TODAY
Southwest winds 10 to 20 knots backing south in the afternoon. A slight chance of showers and thunderstorms. Waves subsiding to calm to 2 feet.

TONIGHT
South winds 10 to 20 knots becoming southwest 15 to 25 knots after midnight, then diminishing to 10 to 20 knots late. Waves building to 2 to 4 feet.

MONDAY
West winds 10 to 20 knots becoming south 15 to 25 knots late. Waves building to 3 to 6 feet occasionally to 8 feet.

MONDAY NIGHT
Southwest winds 20 to 30 knots veering west after midnight. Waves building to 5 to 8 feet occasionally to 10 feet.

TUESDAY
West winds 20 to 30 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.

TUESDAY NIGHT
Northwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet.

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

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

LSZ267-122000
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
400 AM EDT Sun Jul 12 2026

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

TODAY
South winds 10 to 20 knots. A chance of showers and thunderstorms by mid afternoon. Waves subsiding to calm to 2 feet.

TONIGHT
South winds 10 to 20 knots veering southwest after midnight. Waves calm to 2 feet.

MONDAY
Southwest winds 10 to 20 knots becoming west 5 to 15 knots in the afternoon, then backing southeast late. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

MONDAY NIGHT
South winds 10 to 20 knots becoming west 15 to 25 knots after midnight. Waves building to 4 to 7 feet occasionally to 9 feet.

TUESDAY
West winds 15 to 25 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.

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

WEDNESDAY
West winds 10 to 20 knots becoming northwest 5 to 15 knots. Waves calm to 2 feet.

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

LSZ261-121400
MAFOR 1209/ Superior West 12520 11530 13540 12530. A chance of showers and thunderstorms this morning. Waves 1 to 3 feet.

Superior North Central 11510 11520 13530 11520 12530. A chance of showers this morning. Waves 1 to 3 feet today. Waves 1 to 3 feet building to 3 to 5 feet tonight.

Superior South Central 12520 11420 11310 12410 11520 11530. Waves 1 to 3 feet.

Superior East 11420 12520 13410 12510. A chance of showers this afternoon. A chance of showers and thunderstorms this evening. Waves 1 to 3 feet.

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