512
FZUS63 KMQT 052101
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM 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 29.6 inch trough passes over the lake this evening and tonight,
extending from a deepening 29.4 inch low over Hudson Bay. As the
trough shifts east Saturday, a 30.4 inch high builds over the
Northern Plains and Canadian Prairies, shifting east towards the
Great Lakes late this weekend and arriving Monday. The next Clipper
low arrives over Lake Superior at around 29.7 inches Monday night
before leaving Tuesday afternoon. A stronger Clipper low at around
29.3 inches digs through the Northern Plains Tuesday before moving
through the Great Lakes region on Wednesday.


LSZ162-060900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EST Fri Dec 5 2025 /300 PM CST Fri Dec 5 2025/

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 1 to
3 feet 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 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots veering north by
midnight. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. 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 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Snow showers in the evening, then a chance of snow
showers after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots becoming northeast 20 to
30 knots. A chance of snow showers, then snow showers likely.
Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-060900-
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 Fri Dec 5 2025

.LATE THIS AFTERNOON...West winds 15 to 25 knots. A slight chance
of snow showers. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots. A slight chance of
snow showers in the evening. Freezing spray after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Freezing spray in the morning. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots by midnight, then veering north late. Waves
building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves building to 2 to 4 feet, then 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.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Snow showers likely in the
evening, then a chance of snow showers after midnight. Waves
subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow showers, then snow showers likely.
Waves subsiding to calm to 2 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 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-060900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EST Fri Dec 5 2025

.LATE THIS AFTERNOON...West winds 15 to 25 knots. A chance of
snow showers. Waves 2 to 4 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 5 to 8 feet occasionally to
10 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Freezing spray in the morning. Isolated snow showers in
the morning. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots by midnight. A slight chance of snow showers in
the evening. 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. A chance of snow
showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Snow showers likely. Waves
subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northeast gales to 35 knots becoming north 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 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-060900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EST Fri Dec 5 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. A slight
chance of snow showers. Waves 1 to 3 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 20 to
30 knots by midnight, then increasing to 30 knots with a few gale
force gusts to 35 knots possible late. A chance of snow showers.
Waves building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...Northwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 15 to 25 knots.
Isolated snow showers. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...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 1 to 3 feet.
.SUNDAY...Northwest winds 20 to 30 knots. A chance of snow
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots. Snow showers.
Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 15 to 25 knots becoming east 20 to
30 knots. A chance of snow showers, then snow showers likely.
Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...North gales to 35 knots. 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.

$$

LSZ266-060900-
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 Fri Dec 5 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. A slight
chance of snow showers. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 20 to
30 knots by midnight. Scattered snow showers. Waves building to
7 to 10 feet occasionally to 13 feet.
.SATURDAY...Northwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 15 to 25 knots.
Freezing spray in the morning. Scattered snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots by midnight, then increasing to 15 to 25 knots
late. Snow showers likely. 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. Waves building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 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 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Snow showers. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots becoming east 20 to
30 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet, then building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northeast gales to 35 knots backing north. A chance
of snow showers. Freezing spray. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-060900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EST Fri Dec 5 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. A slight
chance of snow showers. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west by
midnight, then becoming northwest 20 to 30 knots late. Scattered
snow showers. Waves building to 7 to 10 feet occasionally to
13 feet.
.SATURDAY...Northwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 15 to 25 knots.
Scattered snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots by midnight, then increasing to 15 to 25 knots
late. Snow showers. 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 becoming north 20 to
30 knots in the afternoon. Snow showers. 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...West winds 15 to 25 knots backing southwest in the
afternoon. 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 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots becoming east 15 to
25 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.
.WEDNESDAY...Northeast winds 20 to 30 knots backing north. Snow
showers likely, then 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.

$$

LSZ261-060300-
MAFOR 0522/
Superior West 11630 11730 12740 12730 11720 11710. Waves 2 to 4
feet building to 3 to 6 feet tonight. Waves 3 to 5 feet subsiding
to 1 to 3 feet Saturday.

Superior North Central 11630 11640 14740 11730 11720. A chance of
snow showers tonight. Waves 3 to 6 feet building to 5 to 8 feet
tonight. Waves 5 to 8 feet subsiding to 2 to 4 feet Saturday.

Superior South Central 11520 11630 11640 12740 11740 19747 11730
19737 11730. Waves 1 to 3 feet building to 5 to 8 feet tonight.
Waves 5 to 9 feet subsiding to 3 to 5 feet Saturday.

Superior East 11520 11530 11647 11747 11740 19747 11747 11737
11730 19737. Waves 3 to 5 feet building to 6 to 9 feet tonight.
Waves 6 to 10 feet subsiding to 5 to 8 feet Saturday.

$$

WFO MQT

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weather.gov/greatlakes