National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 200901
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EST Tue Jan 20 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

Troughing of at least 30.0 inches is over Lake Superior while 30.5 inch high sits over the Lower Mississippi Valley and a 29.7 inch low is over Hudson Bay. By Tuesday night, the high will shift over the Virginias at 30.6 inches while the low remains stationary. Meanwhile, a 30.0 inch low forms over the OK Panhandle, quickly moving over Lake Michigan by Wednesday morning while the a 29.8 inch low drops south through Ontario. By midday Wednesday, the first low will move over the Michigan Lower Peninsula at 29.9 inches as the second low deeps to 29.7 inches over Lake Superior by evening. These features consolidate into a 29.7 inch low over northeastern Ontario Wednesday night before shifting to Quebec Thursday morning. In the wake of the low, 31.0 inch high pressure will be over Saskatchewan, shifting over the Dakotas Friday and overspreading the Upper Midwest at around 30.7 inches Saturday.

LSZ162-202100
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
400 AM EST Tue Jan 20 2026 /300 AM CST Tue Jan 20 2026/

EARLY THIS MORNING
West winds 15 to 25 knots. Scattered snow showers. Waves 3 to 6 feet occasionally to 8 feet.

TODAY
West winds 15 to 25 knots. Scattered snow showers. Waves 3 to 6 feet occasionally to 8 feet.

TONIGHT
West winds 15 to 25 knots diminishing to 10 to 20 knots late. Isolated snow showers. Waves subsiding to 1 to 3 feet.

WEDNESDAY
West winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. A chance of snow showers. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

WEDNESDAY NIGHT
Northwest winds 15 to 25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

THURSDAY
Northwest winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon. Waves 3 to 5 feet occasionally to 7 feet.

THURSDAY NIGHT
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.

FRIDAY
Northwest winds 15 to 25 knots diminishing to 10 to 20 knots. Waves subsiding to calm to 2 feet.

SATURDAY
West winds 10 to 20 knots. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

LSZ263-202100
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 EST Tue Jan 20 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH THIS EVENING

EARLY THIS MORNING
West winds 15 to 25 knots. Heavy freezing spray. Scattered snow showers. Waves 5 to 8 feet occasionally to 10 feet.

TODAY
West winds 15 to 25 knots increasing to 20 to 30 knots. Heavy freezing spray. Scattered snow showers. Waves building to 6 to 9 feet occasionally to 11 feet.

TONIGHT
West winds 15 to 25 knots diminishing to 10 to 20 knots late. Freezing spray in the evening. Scattered snow showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

WEDNESDAY
North winds 5 to 15 knots becoming west 10 to 20 knots. A chance of snow showers. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

WEDNESDAY NIGHT
Northwest winds 15 to 25 knots increasing to 20 to 30 knots after midnight. Heavy freezing spray. A slight chance of snow showers. Waves building to 5 to 8 feet occasionally to 10 feet.

THURSDAY
Northwest winds 20 to 30 knots. Heavy freezing spray. A chance of snow showers. Waves subsiding to 4 to 8 feet occasionally to 10 feet.

THURSDAY NIGHT
Northwest winds 20 to 30 knots. Heavy freezing spray. A chance of snow showers. Waves 5 to 8 feet occasionally to 10 feet.

FRIDAY
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots. Heavy freezing spray. Waves subsiding to 1 to 3 feet.

SATURDAY
West winds 5 to 15 knots. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

LSZ264-202100
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
400 AM EST Tue Jan 20 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH THIS EVENING

EARLY THIS MORNING
West winds 15 to 25 knots. Heavy freezing spray. Scattered snow showers. Waves 4 to 7 feet occasionally to 9 feet.

TODAY
West winds 20 to 30 knots. Heavy freezing spray. Scattered snow showers. Waves building to 6 to 9 feet occasionally to 11 feet.

TONIGHT
West winds 15 to 25 knots becoming northwest 10 to 20 knots late. Freezing spray in the evening. Scattered snow showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

WEDNESDAY
Northwest winds 5 to 15 knots increasing to 10 to 20 knots. A chance of snow showers. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

THURSDAY
Northwest winds 20 to 30 knots. Heavy freezing spray. A chance of snow showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.

THURSDAY NIGHT
Northwest winds 20 to 30 knots. Heavy freezing spray. A chance of snow showers. Waves building to 6 to 9 feet occasionally to 11 feet.

FRIDAY
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots. Heavy freezing spray. A chance of snow showers. Waves subsiding to 2 to 4 feet.

SATURDAY
Northwest winds 10 to 20 knots becoming west 5 to 15 knots. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

LSZ265-202100
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
400 AM EST Tue Jan 20 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH LATE TONIGHT

EARLY THIS MORNING
West winds to 30 knots with a few gale force gusts to 35 knots possible. Heavy freezing spray. Numerous snow showers. Waves 4 to 7 feet occasionally to 9 feet.

TODAY
West winds to 30 knots with a few gale force gusts to 35 knots possible. Heavy freezing spray. Numerous snow showers in the morning. Scattered snow showers in the afternoon. Waves building to 5 to 8 feet occasionally to 10 feet.

TONIGHT
Southwest winds 20 to 30 knots diminishing to 15 to 25 knots late. Heavy freezing spray in the evening. Scattered snow showers. Waves subsiding to 2 to 4 feet.

WEDNESDAY
Southwest winds 15 to 25 knots veering west by mid afternoon. A chance of snow showers. Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.

WEDNESDAY NIGHT
West winds 20 to 30 knots increasing to gales to 35 knots after midnight. Heavy freezing spray. A chance of snow showers. Waves building to 5 to 8 feet occasionally to 10 feet.

THURSDAY
West gales to 40 knots. Heavy freezing spray. A chance of snow showers. Waves 5 to 8 feet occasionally to 10 feet.

THURSDAY NIGHT
Northwest gales to 40 knots. Heavy freezing spray. Snow showers likely in the evening. A chance of snow showers after midnight. Waves building to 6 to 9 feet occasionally to 11 feet.

FRIDAY
Northwest gales to 35 knots diminishing to 20 to 30 knots. Heavy freezing spray. A chance of snow showers. Waves subsiding to 2 to 4 feet.

SATURDAY
West winds 15 to 25 knots diminishing to 10 to 20 knots. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

LSZ266-202100
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 EST Tue Jan 20 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH LATE TONIGHT

EARLY THIS MORNING
West winds to 30 knots with a few gale force gusts to 35 knots possible. Heavy freezing spray. Snow showers. Waves 8 to 11 feet occasionally to 14 feet.

TODAY
West winds to 30 knots with a few gale force gusts to 35 knots possible diminishing to 20 to 30 knots by mid afternoon. Heavy freezing spray. Snow showers. Waves building to 9 to 12 feet occasionally to 15 feet.

TONIGHT
West winds 20 to 30 knots diminishing to 15 to 25 knots late. Heavy freezing spray. Scattered snow showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.

WEDNESDAY
Southwest winds 10 to 20 knots becoming west 15 to 25 knots by mid afternoon. A chance of snow showers. Waves subsiding to 2 to 4 feet.

WEDNESDAY NIGHT
West winds 20 to 30 knots becoming northwest gales to 35 knots after midnight. Heavy freezing spray. A chance of snow showers. Waves building to 7 to 10 feet occasionally to 13 feet.

THURSDAY
West gales to 35 knots. Heavy freezing spray. Snow showers likely. Waves building to 9 to 12 feet occasionally to 15 feet.

THURSDAY NIGHT
Northwest gales to 40 knots. Heavy freezing spray. Snow showers likely. Waves subsiding to 8 to 11 feet occasionally to 14 feet, then building to 9 to 12 feet occasionally to 15 feet.

FRIDAY
Northwest gales to 35 knots diminishing to 20 to 30 knots. Heavy freezing spray. A chance of snow showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.

SATURDAY
Northwest winds 15 to 25 knots backing west. A chance of snow showers. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

LSZ267-202100
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
400 AM EST Tue Jan 20 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY MORNING

EARLY THIS MORNING
West winds 20 to 30 knots. Heavy freezing spray. Snow showers. Waves 7 to 11 feet occasionally to 13 feet.

TODAY
West winds 20 to 30 knots increasing to 30 knots with a few gale force gusts to 35 knots possible. Heavy freezing spray. Snow showers. Waves building to 9 to 12 feet occasionally to 15 feet.

TONIGHT
Southwest winds to 30 knots with a few gale force gusts to 35 knots possible diminishing to 15 to 25 knots late. Heavy freezing spray. Scattered snow showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.

WEDNESDAY
Southwest winds 15 to 25 knots diminishing to 10 to 20 knots by late morning, then increasing to 15 to 25 knots by mid afternoon. Freezing spray in the morning. A chance of snow showers. Waves subsiding to 2 to 4 feet.

WEDNESDAY NIGHT
West winds 20 to 30 knots becoming northwest gales to 35 knots after midnight. Freezing spray. Snow showers likely. Waves building to 7 to 10 feet occasionally to 13 feet.

THURSDAY
West gales to 35 knots. Heavy freezing spray. Snow showers likely. Waves building to 9 to 12 feet occasionally to 15 feet.

THURSDAY NIGHT
Northwest gales to 35 knots. Heavy freezing spray. Snow showers. Waves subsiding to 8 to 11 feet occasionally to 14 feet.

FRIDAY
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots. Heavy freezing spray. Snow showers likely. A chance of snow showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.

SATURDAY
Northwest winds 10 to 20 knots backing west. A chance of snow showers. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

LSZ261-201500
MAFOR 2010/ Superior West...HEAVY FREEZING SPRAY WARNING IN EFFECT...11632 19637 13642 19647 11642 11640 11630 11620 19627. Waves 3 to 6 feet building to 4 to 7 feet today. Waves 4 to 7 feet subsiding to 3 to 6 feet tonight.

Superior North Central...HEAVY FREEZING SPRAY WARNING IN EFFECT... 11747 14642 19647 12630 19637 11720 19727. Waves 5 to 9 feet today. Waves 5 to 9 feet subsiding to 3 to 6 feet tonight.

Superior South Central...HEAVY FREEZING SPRAY WARNING IN EFFECT... 13647 12642 19647 11542 19547 11542 11530. Waves 5 to 9 feet today. Waves 5 to 9 feet subsiding to 3 to 6 feet tonight.

Superior East...HEAVY FREEZING SPRAY WARNING IN EFFECT...11747 12647 12657 11650 19657 12540 19547. Waves 7 to 10 feet building to 9 to 12 feet today. Waves 8 to 12 feet subsiding to 6 to 9 feet tonight.

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

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