863
FZUS63 KMQT 050900
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EST Fri Dec 5 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 29.7 inch low pressure system is moving through Ontario early this
morning. Another 29.6 inch trough will pass over the lake tonight,
extending from a 29.4 inch low over Hudson Bay. As the trough shifts
east Saturday, another 30.4 inch high builds over the Northern
Plains and shifts east across the Great Lakes through the weekend
ahead of the next Clipper low arriving over Lake Superior at around
29.6 inches on Monday and into Tuesday morning.


LSZ162-052100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EST Fri Dec 5 2025 /300 AM CST Fri Dec 5 2025/

.EARLY THIS MORNING...West winds 15 to 25 knots. A slight chance
of snow showers. Waves 4 to 8 feet occasionally to 10 feet.
.TODAY...West winds 10 to 20 knots. A slight chance of snow
showers. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves 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 becoming west 10 to
20 knots. A chance of snow showers, then snow showers likely.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots becoming northeast 20 to
30 knots. A chance of snow showers, then snow showers likely.
Waves building to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-052100-
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 Fri Dec 5 2025

.EARLY THIS MORNING...West winds 20 to 30 knots. A slight chance
of snow showers. Waves 8 to 11 feet occasionally to 14 feet
subsiding to 7 to 10 feet occasionally to 13 feet.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots.
A slight chance of snow showers. Waves subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by midnight. A slight chance of snow showers in the
evening. Freezing spray after midnight. Waves building to 5 to
8 feet occasionally to 10 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 5 to
15 knots. Freezing spray in the morning. A slight chance of snow
showers in the morning. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. A slight chance
of snow showers after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing west 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,
then subsiding to 2 to 4 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 4 to 7 feet occasionally to 9 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-052100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EST Fri Dec 5 2025

...GALE WARNING IN EFFECT UNTIL 7 AM EST THIS MORNING...

.EARLY THIS MORNING...West winds 20 to 30 knots. A chance of snow
showers. Waves 9 to 12 feet occasionally to 15 feet subsiding to
8 to 11 feet occasionally to 14 feet.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots.
A chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 20 to
30 knots by midnight. A chance of snow showers. Freezing spray
after midnight. Waves building to 6 to 9 feet occasionally to
11 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Freezing spray in the morning. A slight chance of snow
showers. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. A slight chance
of snow showers. Waves building to 3 to 5 feet occasionally to
7 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 diminishing to 10 to
20 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming northeast
20 to 30 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 4 to 7 feet occasionally to 9 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-052100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EST Fri Dec 5 2025

...GALE WARNING IN EFFECT UNTIL 7 AM EST THIS MORNING...

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

Note, wave height forecasts are for ice free areas.

$$

LSZ266-052100-
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 Fri Dec 5 2025

...GALE WARNING IN EFFECT UNTIL 7 AM EST THIS MORNING...

.EARLY THIS MORNING...West winds 20 to 30 knots. Freezing spray.
A chance of snow showers. Waves 9 to 12 feet occasionally to
15 feet subsiding to 8 to 11 feet occasionally to 14 feet.
.TODAY...West winds 15 to 25 knots backing southwest. A chance of
snow showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by midnight, then becoming northwest gales to 35 knots
late. A chance of snow showers. Freezing spray after midnight.
Waves building to 8 to 11 feet occasionally to 14 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Freezing spray. Snow showers likely in
the morning. A chance of snow showers in the afternoon. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of snow showers in the
evening, then snow showers likely after midnight. Freezing spray
after midnight. Waves subsiding to 2 to 4 feet, then building to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Freezing spray. Snow
showers likely in the morning. A chance of snow showers in the
afternoon. Waves building to 4 to 7 feet occasionally to 9 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. A chance of snow
showers, then snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots veering northeast. A chance
of snow showers. Waves subsiding to 2 to 4 feet, then building to
3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-052100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EST Fri Dec 5 2025

...GALE WARNING IN EFFECT UNTIL 7 AM EST THIS MORNING...

.EARLY THIS MORNING...Southwest gales to 40 knots. Freezing
spray. Snow showers likely. Waves 9 to 12 feet occasionally to
15 feet subsiding to 8 to 11 feet occasionally to 14 feet.
.TODAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by midnight, then becoming northwest gales to 35 knots
late. Snow showers likely in the evening, then a chance of snow
showers after midnight. Waves building to 8 to 11 feet
occasionally to 14 feet.
.SATURDAY...Northwest gales to 40 knots diminishing to 20 to
30 knots by mid afternoon. Freezing spray in the morning. Snow
showers likely. Waves subsiding to 5 to 8 feet occasionally to
10 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. Snow showers likely. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots veering north in the
afternoon. Snow showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots becoming northwest
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. A chance of snow showers, then snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots backing east. Snow showers.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-051500-
MAFOR 0510/
Superior West 11640 13620 11630 12730 11740. Waves 5 to 9 feet
subsiding to 2 to 4 feet today. Waves 3 to 6 feet building to 4
to 7 feet tonight.

Superior North Central...GALE WARNING IN EFFECT...11640 11630
12620 12630 12740. A chance of snow showers today and this
evening. Waves 8 to 12 feet subsiding to 3 to 5 feet today. Waves
3 to 6 feet building to 5 to 8 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...11640 11630
11530 12520 11630 11640 11740. A chance of snow showers tonight.
Waves 5 to 8 feet subsiding to 1 to 3 feet today. Waves 1 to 3
feet building to 5 to 8 feet tonight.

Superior East...GALE WARNING IN EFFECT...11557 11540 11530 12520
11530 11647 11750. Waves 8 to 12 feet subsiding to 4 to 6 feet
today. Waves 3 to 5 feet building 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