891
FZUS63 KMQT 041501
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EST Thu Dec 4 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...

30.5 inch high pressure over Iowa this morning will shift east to
the Lower Great Lakes through Thursday evening, sending a 30.2 inch
ridge over Lake Superior. Meanwhile, a 29.7 inch low will move over
Lake Winnipeg this afternoon before passing north of Lake Superior
overnight into Friday. Another 29.6 inch trough will pass over the
lake Friday night, extending from a 29.4 inch low over Hudson Bay.
As the trough shifts east, 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.


LSZ162-042100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EST Thu Dec 4 2025 /900 AM CST Thu Dec 4 2025/

...GALE WARNING IN EFFECT FROM 4 PM EST /3 PM CST/ THIS AFTERNOON
THROUGH LATE TONIGHT...

.REST OF TODAY...Southwest winds 15 to 25 knots increasing to
gales to 35 knots. Freezing spray in the afternoon. A slight
chance of snow showers in the afternoon. Waves 1 to 3 feet
building to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...Southwest gales to 40 knots becoming west 20 to
30 knots late. Freezing spray. A chance of snow showers. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...West winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots. A slight chance
of snow showers. Waves building to 2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. 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 becoming west 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-042100-
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 Thu Dec 4 2025

...GALE WARNING IN EFFECT FROM 4 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.REST OF TODAY...West winds 10 to 20 knots becoming southwest
20 to 30 knots by late morning, then increasing to gales to
35 knots by mid afternoon. A slight chance of snow showers.
Freezing spray in the afternoon. Waves 2 to 4 feet building to
7 to 10 feet occasionally to 13 feet.
.TONIGHT...Southwest gales to 40 knots becoming west gales to
35 knots late. Freezing spray in the evening. Snow showers in the
evening, then a chance of snow showers after midnight. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 7 to 10 feet occasionally to 13 feet.
.FRIDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. A chance of snow showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Freezing spray in the morning. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-042100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EST Thu Dec 4 2025

...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH
FRIDAY MORNING...

.REST OF TODAY...Northwest winds 10 to 20 knots becoming west
20 to 30 knots by late morning, then becoming southwest gales to
35 knots by mid afternoon. Freezing spray in the afternoon. A
chance of snow showers in the afternoon. Waves 4 to 7 feet
occasionally to 9 feet subsiding to 2 to 4 feet, then building to
6 to 9 feet occasionally to 11 feet.
.TONIGHT...Southwest gales to 35 knots veering west late.
Freezing spray in the evening. Snow showers. Waves building to
10 to 14 feet occasionally to 18 feet, then subsiding to 8 to
11 feet occasionally to 14 feet.
.FRIDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. A chance of snow showers. Freezing
spray after midnight. Waves building to 5 to 8 feet occasionally
to 10 feet.
.SATURDAY...Northwest winds 20 to 30 knots. Freezing spray. A
slight chance of snow showers. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Freezing spray in the evening.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. Waves
subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-042100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EST Thu Dec 4 2025

...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH
FRIDAY MORNING...

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

Note, wave height forecasts are for ice free areas.

$$

LSZ266-042100-
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 Thu Dec 4 2025

...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH
FRIDAY MORNING...

.REST OF TODAY...Northwest gales to 35 knots diminishing to 15 to
25 knots by late morning, then becoming southwest 20 to 30 knots
by mid afternoon. Freezing spray late in the morning. A chance of
snow showers. Waves 9 to 12 feet occasionally to 15 feet
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
4 to 7 feet occasionally to 9 feet.
.TONIGHT...Southwest gales to 40 knots. Freezing spray. Snow
showers. Waves building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 9 to 12 feet occasionally to 15 feet.
.FRIDAY...West winds 15 to 25 knots backing southwest. A chance
of snow showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. Snow showers. Waves subsiding to
2 to 4 feet, then building to 6 to 9 feet occasionally to
11 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Freezing spray. Snow showers in the
morning. A chance of snow showers in the afternoon. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. Freezing spray.
A chance of snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west. Freezing
spray. 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.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-042100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EST Thu Dec 4 2025

...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH
FRIDAY MORNING...

.REST OF TODAY...Northwest winds 20 to 30 knots backing southwest
by mid afternoon. Freezing spray. A chance of snow showers. Waves
9 to 12 feet occasionally to 15 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Southwest gales to 45 knots. Freezing spray. A chance
of snow showers in the evening. Snow showers after midnight.
Waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 7 to 10 feet occasionally to 13 feet.
.FRIDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots. Snow showers likely. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Snow showers. Waves subsiding to
2 to 4 feet, then building to 6 to 9 feet occasionally to
11 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Freezing spray. Snow showers. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. Snow showers.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west. Snow
showers likely, then a chance of snow showers. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots. A chance of snow showers, then snow showers likely.
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.

$$

LSZ261-042100-
MAFOR 0416/
Superior West...GALE WARNING IN EFFECT...11540 12550 12557 11650
11640 11620. Waves 2 to 3 feet building to 5 to 8 feet this
afternoon. Waves 7 to 10 feet building to 8 to 12 feet tonight.
Waves 5 to 8 feet subsiding to 3 to 5 feet Friday morning.

Superior North Central...GALE WARNING IN EFFECT...11620 12550
12557 11657 11640 11630. Waves 3 to 6 feet building to 5 to 8
feet this afternoon. Waves 7 to 10 feet building to 10 to 14 feet
tonight. Waves 8 to 11 feet subsiding to 5 to 8 feet Friday
morning.

Superior South Central...GALE WARNING IN EFFECT...11630 11530
11540 13550 12640. A chance of snow showers tonight and Friday
morning. Waves 5 to 8 feet subsiding to 3 to 5 feet this
afternoon. Waves 4 to 7 feet building to 5 to 9 feet tonight.
Waves 4 to 7 feet subsiding to 3 to 5 feet Friday morning.

Superior East...GALE WARNING IN EFFECT...11740 11620 11540 11550
13557 11647. Waves 6 to 10 feet subsiding to 5 to 7 feet this
afternoon. Waves 5 to 7 feet building to 10 to 13 feet tonight.
Waves 8 to 11 feet subsiding to 6 to 9 feet Friday 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