619
FZUS63 KMQT 061500
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EST Sat Dec 6 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...

A 30.3 inch high over Saskatchewan today progressively builds into
the Northern Plains this evening to Sunday, eventually strengthening
to 30.5 inches over Minnesota by Sunday. The high continues into the
Great Lakes basin as it weakens slightly to 30.4 inches by Monday.
By Monday afternoon, a 29.7 inch low develops over North Dakota,
eventually moving over Lake Superior Tuesday morning as it deepens
to 29.6 inches. A second, stronger Clipper Low forms Tuesday over
the Montana/Canada border, absorbing the previous low Tuesday night
at 29.2 inches as it approaches Lake Michigan. The low weakens
slightly to 29.3 inches as it moves near the Lower Great Lakes on
Wednesday while 30.1 inch ridging settles over the Plains. The low
quickly ejects past the St Lawrence Seaway by Thursday as high
pressure over the Canadian Rockies builds to 30.8 inches.


LSZ162-062100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EST Sat Dec 6 2025 /900 AM CST Sat Dec 6 2025/

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots. Waves 2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north by
midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest by late
morning, then diminishing to 5 to 15 knots by mid afternoon.
Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Snow showers. Waves subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming northeast
20 to 30 knots. A chance of snow showers, then snow showers
likely. Waves subsiding to calm to 2 feet, then building to 4 to
7 feet occasionally to 9 feet.
.WEDNESDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots. Freezing spray. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-062100-
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-
1000 AM EST Sat Dec 6 2025

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots by mid afternoon. Waves 3 to 5 feet occasionally to
7 feet subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by midnight, then veering north late. A slight chance of
snow showers. Waves building to 2 to 4 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest. Waves
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of snow showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. Snow showers. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming northeast
20 to 30 knots. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. A chance of snow showers. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-062100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EST Sat Dec 6 2025

.REST OF TODAY...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots by mid afternoon. Freezing spray late in the
morning. A slight chance of snow showers late in the morning.
Waves 4 to 7 feet occasionally to 9 feet subsiding to 1 to
3 feet.
.TONIGHT...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by midnight. A slight chance of snow showers. Waves
building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Freezing spray in the
morning. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 15 to 25 knots. A slight chance of snow
showers in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Snow showers likely. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming northeast
20 to 30 knots. A chance of snow showers. Freezing spray. Waves
subsiding to 1 to 3 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...North winds 20 to 30 knots. Freezing spray. A chance
of snow showers. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-062100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EST Sat Dec 6 2025

.REST OF TODAY...Northwest winds 20 to 30 knots diminishing to
10 to 20 knots by mid afternoon. Freezing spray late in the
morning. A chance of snow showers. Waves 4 to 7 feet occasionally
to 9 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots increasing to 15 to
25 knots late. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 2 to 4 feet.
.SUNDAY...Northwest winds 20 to 30 knots. A chance of snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. A slight chance of snow showers in the evening. Waves
subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 20 to
30 knots in the afternoon. A slight chance of snow showers in the
afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots. Snow showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...West winds 15 to 25 knots becoming northeast 20 to
30 knots. A chance of snow showers, then snow showers likely.
Waves subsiding to calm to 2 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...North gales to 35 knots becoming northwest 20 to
30 knots. A chance of snow showers. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-062100-
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-
1000 AM EST Sat Dec 6 2025

.REST OF TODAY...Northwest winds to 30 knots with a few gale
force gusts to 35 knots possible diminishing to 15 to 25 knots.
Freezing spray late in the morning. A chance of snow showers.
Waves 7 to 10 feet occasionally to 13 feet subsiding to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by midnight. A chance of snow showers. Waves subsiding
to 1 to 3 feet, then building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Freezing spray. Snow
showers. Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...Southwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow showers. 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 becoming northeast 20 to
30 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet, then building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...North gales to 35 knots diminishing to 20 to
30 knots. Freezing spray. A chance of snow showers. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-062100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EST Sat Dec 6 2025

.REST OF TODAY...Northwest winds to 30 knots with a few gale
force gusts to 35 knots possible diminishing to 10 to 20 knots.
Freezing spray late in the morning. Snow showers likely late in
the morning, then a chance of snow showers in the afternoon.
Waves 7 to 10 feet occasionally to 13 feet subsiding to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots. Snow showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SUNDAY...North winds 15 to 25 knots increasing to 20 to 30 knots
by late morning, then backing northwest by mid afternoon. Snow
showers. Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots becoming west 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots. Snow showers.
Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 15 to 25 knots backing east. Snow showers.
Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-062100-
MAFOR 0616/
Superior West 11720 12710 12720 13820. Waves 2 to 4 feet
subsiding to 1 to 3 feet this afternoon. Waves 1 to 3 feet
tonight and Sunday morning.

Superior North Central 11730 14720 11720 12730. Waves 4 to 7 feet
subsiding to 2 to 4 feet this afternoon. Waves 2 to 4 feet
tonight. Waves 3 to 6 feet Sunday morning.

Superior South Central 11740 14720 11720 12730. A chance of snow
showers. Waves 5 to 8 feet subsiding to 3 to 6 feet this
afternoon. Waves 2 to 4 feet tonight. Waves 3 to 6 feet Sunday
morning.

Superior East 11747 13720 11717 11727 12837. Waves 5 to 9 feet
subsiding to 4 to 7 feet this afternoon. Waves 3 to 5 feet
subsiding to 2 to 4 feet tonight. Waves 3 to 6 feet Sunday
morning.

$$

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