574
FZUS63 KMQT 050300
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM 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...

A 29.7 inch low will pass 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.


LSZ162-050900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EST Thu Dec 4 2025 /900 PM CST Thu Dec 4 2025/

...GALE WARNING IN EFFECT UNTIL 4 AM EST /3 AM CST/ FRIDAY...

.REST OF TONIGHT...Southwest gales to 40 knots becoming west
15 to 25 knots late. 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.
.FRIDAY...West winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots increasing to
20 to 30 knots by midnight, then diminishing to 15 to 25 knots
late. A slight chance of snow showers in the evening. Waves
building to 3 to 5 feet occasionally to 7 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. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots. A chance of snow
showers, then snow showers likely. Waves building to 2 to 4 feet,
then subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming northeast
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.

$$

LSZ263-050900-
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 PM EST Thu Dec 4 2025

...GALE WARNING IN EFFECT UNTIL 4 AM EST FRIDAY...

.REST OF TONIGHT...Southwest gales to 40 knots becoming west
20 to 30 knots late. Freezing spray late in the evening. Snow
showers late in the evening, then a chance of snow showers after
midnight. Waves 10 to 14 feet occasionally to 18 feet 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 by 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 diminishing to 10 to
20 knots in the afternoon. Freezing spray in the morning. A
slight chance of snow showers in the morning. Waves subsiding to
1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. A slight chance
of snow showers. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. 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 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming northeast
15 to 25 knots. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-050900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EST Thu Dec 4 2025

...GALE WARNING IN EFFECT UNTIL 7 AM EST FRIDAY...

.REST OF TONIGHT...Southwest gales to 35 knots veering west late.
Freezing spray late in the evening. Snow showers late in the
evening, then snow showers likely after midnight. Waves 9 to
12 feet occasionally to 15 feet 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 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 15 to
25 knots in the afternoon. Freezing spray. A slight chance of
snow showers. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A slight chance of snow showers.
Freezing spray after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. 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.
.TUESDAY...Northwest winds 10 to 20 knots becoming northeast
15 to 25 knots. Waves subsiding to 1 to 3 feet, then building to
3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-050900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EST Thu Dec 4 2025

...GALE WARNING IN EFFECT UNTIL 7 AM EST FRIDAY...

.REST OF TONIGHT...Southwest gales to 40 knots becoming west
20 to 30 knots late. Freezing spray. A chance of snow showers.
Waves 4 to 8 feet occasionally to 10 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.FRIDAY...West winds 15 to 25 knots backing southwest. A chance
of snow showers. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...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 5 to 8 feet
occasionally to 10 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 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
snow showers. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 15 to 25 knots. A chance of snow
showers, then snow showers likely. Waves calm to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 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.

$$

LSZ266-050900-
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 PM EST Thu Dec 4 2025

...GALE WARNING IN EFFECT UNTIL 7 AM EST FRIDAY...

.REST OF TONIGHT...Southwest gales to 40 knots. Freezing spray. A
chance of snow showers. Waves 7 to 10 feet occasionally to
13 feet 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 backing southwest. A chance
of snow showers. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots by midnight, then becoming northwest gales to
35 knots late. Snow showers in the evening, then a chance of snow
showers after midnight. Freezing spray after midnight. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Freezing spray. A chance of snow
showers. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
snow showers. Freezing spray after midnight. Waves subsiding to
3 to 6 feet occasionally to 8 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 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 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...Northwest winds 15 to 25 knots becoming northeast
10 to 20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-050900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EST Thu Dec 4 2025

...GALE WARNING IN EFFECT UNTIL 7 AM EST FRIDAY...

.REST OF TONIGHT...Southwest gales to 45 knots. Freezing spray. A
chance of snow showers late in the evening. Snow showers after
midnight. Waves 7 to 10 feet occasionally to 13 feet 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 in the morning, then a chance of
snow showers in the afternoon. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots by midnight, then becoming northwest gales to
35 knots late. Snow showers. Waves building to 7 to 10 feet
occasionally to 13 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Snow showers. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. Snow showers
likely. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Snow showers likely.
Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots backing northwest
after midnight. Snow showers likely in the evening, then a chance
of snow showers after midnight. 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. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots veering northeast. Snow
showers likely, then a chance of snow showers. Waves subsiding to
1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-050900-
MAFOR 0504/
Superior West...GALE WARNING IN EFFECT...11557 11640 11630 12620
11520 11620 11740. Waves 9 to 12 feet subsiding to 7 to 10 feet
overnight. Waves 4 to 7 feet subsiding to 1 to 3 feet Friday.
Waves 2 to 4 feet Friday evening.

Superior North Central...GALE WARNING IN EFFECT...11557 11657
11640 11630 11620 11520 12630. Waves 9 to 13 feet overnight.
Waves 7 to 10 feet subsiding to 2 to 4 feet Friday. Waves 3 to 5
feet Friday evening.

Superior South Central...GALE WARNING IN EFFECT...11550 11540
11640 11630 13520 11637. Waves 5 to 9 feet overnight. Waves 4 to
7 feet subsiding to 1 to 3 feet Friday. Waves 1 to 3 feet
building to 2 to 4 feet Friday evening.

Superior East...GALE WARNING IN EFFECT...13557 11537 11530 11520
11527 11537. Waves 8 to 11 feet building to 10 to 13 feet
overnight. Waves 6 to 10 feet subsiding to 4 to 7 feet Friday.
Waves 2 to 4 feet building to 3 to 5 feet Friday evening.

$$

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