National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 192101
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EST Mon Jan 19 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

A high pressure over the Midwest will extend weak ridging of 30.1 inches over the western part of the lake tonight while weak troughing of 30.0 inches slowly moves though the eastern half of the lake. These features remain in place on Tuesday as a 30.3 inch high moves south of the area. A 29.8 inch low then moves over Lower Michigan on Wednesday ahead of a secondary 29.8 inch low moving into Lake Superior later in the day. As the lows phase and continue east Wednesday night into Thursday, a weak remnant trough of 30.0 inches extends over the lake. After that, a 31.0 inch high builds from the Canadian Prairies into the Northern Plains Thursday night through Friday. This high builds into the Upper Midwest Friday night into Saturday as it weakens to 30.7 inches.

LSZ162-200900
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
400 PM EST Mon Jan 19 2026 /300 PM CST Mon Jan 19 2026/

HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 11 PM EST /10 PM CST/ THIS EVENING

LATE THIS AFTERNOON
Northwest winds to 30 knots with a few gale force gusts to 35 knots possible. Heavy freezing spray. A slight chance of snow showers. Waves 3 to 6 feet occasionally to 8 feet building to 4 to 7 feet occasionally to 9 feet.

TONIGHT
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots by midnight, then backing west late. Heavy freezing spray in the evening. A chance of snow showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

TUESDAY
West winds 15 to 25 knots. A slight chance of snow showers. Waves subsiding to 2 to 4 feet.

TUESDAY NIGHT
West winds 10 to 20 knots. A chance of snow showers. Waves subsiding to calm to 2 feet.

WEDNESDAY
West winds 10 to 20 knots. A chance of snow showers. Waves building to 1 to 3 feet.

WEDNESDAY NIGHT
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. 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.

LSZ263-200900
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 PM EST Mon Jan 19 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY EVENING

LATE THIS AFTERNOON
Northwest winds 20 to 30 knots. Heavy freezing spray. Snow showers. Waves 5 to 9 feet occasionally to 11 feet.

TONIGHT
Northwest winds 15 to 25 knots. Heavy freezing spray. Snow showers likely. Waves subsiding to 4 to 7 feet occasionally to 9 feet.

TUESDAY
West winds 15 to 25 knots. Heavy freezing spray. A chance of snow showers. Waves 4 to 7 feet occasionally to 9 feet.

TUESDAY NIGHT
West winds 15 to 25 knots diminishing to 10 to 20 knots by midnight. Heavy freezing spray in the evening. A chance of snow showers. Waves subsiding to 2 to 4 feet.

WEDNESDAY
West winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. 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 after midnight. Waves building to 4 to 7 feet occasionally to 9 feet.

THURSDAY
Northwest winds 20 to 30 knots. Heavy freezing spray. Waves building to 4 to 8 feet occasionally to 10 feet.

THURSDAY NIGHT
Northwest winds 20 to 30 knots. Heavy freezing spray. Waves 4 to 7 feet occasionally to 9 feet.

FRIDAY
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots. Heavy freezing spray. Waves subsiding to 2 to 4 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.

LSZ264-200900
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
400 PM EST Mon Jan 19 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY EVENING

LATE THIS AFTERNOON
Northwest winds 20 to 30 knots. Heavy freezing spray. Snow showers. Waves 5 to 8 feet occasionally to 10 feet.

TONIGHT
Northwest winds 15 to 25 knots. Heavy freezing spray. Snow showers likely. Waves building to 6 to 9 feet occasionally to 11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.

TUESDAY
West winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Heavy freezing spray. A chance of snow showers. Waves building to 4 to 8 feet occasionally to 10 feet.

TUESDAY NIGHT
West winds 15 to 25 knots becoming northwest 10 to 20 knots late. Freezing spray in the evening. A slight chance of snow showers. Waves subsiding to 2 to 4 feet.

WEDNESDAY
Northwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. 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 after midnight. 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 5 to 8 feet occasionally to 10 feet.

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

FRIDAY
Northwest gales to 35 knots diminishing to 15 to 25 knots. Heavy freezing spray. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

SATURDAY
Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

LSZ265-200900
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
400 PM EST Mon Jan 19 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY EVENING

LATE THIS AFTERNOON
Northwest winds to 30 knots with a few gale force gusts to 35 knots possible. Heavy freezing spray. Snow showers likely. Waves 6 to 10 feet occasionally to 13 feet.

TONIGHT
Northwest winds to 30 knots with a few gale force gusts to 35 knots possible diminishing to 20 to 30 knots by midnight. Heavy freezing spray. A chance of snow showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet, then building to 6 to 9 feet occasionally to 11 feet.

TUESDAY
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. A chance of snow showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.

TUESDAY NIGHT
West winds to 30 knots with a few gale force gusts to 35 knots possible becoming southwest 20 to 30 knots by midnight, then becoming west 15 to 25 knots late. A slight chance of snow showers. Waves subsiding to 1 to 3 feet.

WEDNESDAY
Southwest winds 15 to 25 knots veering west in the afternoon. A chance of snow showers. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

WEDNESDAY NIGHT
West winds 20 to 30 knots becoming northwest gales to 35 knots after midnight. A chance of snow showers. Heavy freezing spray after midnight. 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 building to 5 to 9 feet occasionally to 11 feet.

THURSDAY NIGHT
Northwest gales to 40 knots. Heavy freezing spray. A chance of snow showers. Waves 5 to 8 feet occasionally to 10 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 5 feet occasionally to 7 feet.

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

Note, wave height forecasts are for ice free areas.

LSZ266-200900
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 PM EST Mon Jan 19 2026

GALE WARNING IN EFFECT UNTIL 7 PM EST THIS EVENING

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY EVENING

LATE THIS AFTERNOON
Northwest gales to 35 knots. Heavy freezing spray. Snow showers likely. Waves 10 to 14 feet occasionally to 18 feet subsiding to 9 to 12 feet occasionally to 15 feet.

TONIGHT
Northwest gales to 35 knots diminishing to 20 to 30 knots by midnight. Heavy freezing spray. Snow showers. Waves subsiding to 7 to 10 feet occasionally to 13 feet, then building to 8 to 11 feet occasionally to 14 feet.

TUESDAY
West gales to 35 knots diminishing to 20 to 30 knots by mid afternoon. Heavy freezing spray. Snow showers likely in the morning. A chance of snow showers in the afternoon. Waves 7 to 10 feet occasionally to 13 feet.

TUESDAY NIGHT
West winds 20 to 30 knots diminishing to 15 to 25 knots late. Heavy freezing spray. A chance of snow showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.

WEDNESDAY
Southwest winds 10 to 20 knots becoming west 15 to 25 knots in the 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. Snow showers likely in the evening. A chance of snow showers after midnight. Waves building to 7 to 10 feet occasionally to 13 feet.

THURSDAY
Northwest 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 in the evening. A chance of snow showers after midnight. Waves subsiding to 8 to 11 feet occasionally to 14 feet.

FRIDAY
Northwest gales to 35 knots diminishing to 20 to 30 knots. Heavy freezing spray. A chance of snow showers. Waves building to 9 to 12 feet occasionally to 15 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.

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

Note, wave height forecasts are for ice free areas.

LSZ267-200900
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
400 PM EST Mon Jan 19 2026

HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH LATE TUESDAY NIGHT

LATE THIS AFTERNOON
Northwest 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 building to 9 to 12 feet occasionally to 15 feet.

TONIGHT
Northwest winds 20 to 30 knots diminishing to 15 to 25 knots by midnight. Heavy freezing spray. Snow showers. Waves subsiding to 7 to 10 feet occasionally to 13 feet, then building to 8 to 11 feet occasionally to 14 feet.

TUESDAY
West winds 15 to 25 knots increasing to 30 knots with a few gale force gusts to 35 knots possible. Heavy freezing spray. Snow showers. Waves building to 7 to 11 feet occasionally to 14 feet.

TUESDAY NIGHT
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. A chance of snow showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.

WEDNESDAY
Southwest winds 15 to 25 knots. A chance of snow showers in the morning, then snow showers likely in the afternoon. Waves subsiding to 2 to 4 feet.

THURSDAY
Northwest gales to 35 knots backing west in the afternoon. Heavy freezing spray. Snow showers likely. Waves building to 10 to 14 feet occasionally to 18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.

THURSDAY NIGHT
Northwest gales to 35 knots. Heavy freezing spray. Snow showers likely in the evening. A chance of snow showers after midnight. 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. A chance of snow showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.

SATURDAY
Northwest winds 10 to 20 knots increasing to 15 to 25 knots. A chance of snow showers. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

LSZ261-200300
MAFOR 1922/ Superior West...HEAVY FREEZING SPRAY WARNING IN EFFECT...12742 12732 12632 12630. A chance of snow showers this evening. Waves 5 to 8 feet subsiding to 3 to 6 feet tonight. Waves 3 to 6 feet Tuesday.

Superior North Central...HEAVY FREEZING SPRAY WARNING IN EFFECT... 12747 13737 13642. Waves 5 to 8 feet.

Superior South Central...GALE WARNING IN EFFECT...HEAVY FREEZING SPRAY WARNING IN EFFECT...12747 12742 11747 11647 12642. Waves 7 to 11 feet subsiding to 6 to 9 feet tonight. Waves 5 to 8 feet Tuesday.

Superior East...GALE WARNING IN EFFECT...HEAVY FREEZING SPRAY WARNING IN EFFECT...13747 12737 11747 12647. Waves 7 to 10 feet tonight. Waves 6 to 10 feet building to 8 to 11 feet Tuesday.

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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