636
FZUS63 KMQT 082101
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EST Mon Dec 8 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 30.4 inch high over the Great Lakes today will shift east to
Upstate New York this evening as a 29.8 inch low over the Canadian
Prairie deepens to 29.6 inches while moving over Lake Superior by
Tuesday morning. A stronger 29.3 inch low moving out of the Canadian
Rockies will cross Lake Michigan at 29.2 inches Tuesday night,
resulting in 29.5 inch troughing over Lake Superior into Wednesday.
This low will move into New England at 29.2 inches by Wednesday
night, allowing 30.5 inch high pressure to rebuild over the Northern
Plains through Friday and shift east towards the Great Lakes during
the weekend.


LSZ162-090900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EST Mon Dec 8 2025 /300 PM CST Mon Dec 8 2025/

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

Note, wave height forecasts are for ice free areas.

$$

LSZ263-090900-
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 Mon Dec 8 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...South winds 15 to 25 knots becoming southwest 10 to
20 knots by midnight, then veering west late. Snow likely. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. A slight chance of snow showers. Waves subsiding to
calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming northeast
20 to 30 knots by midnight. A chance of snow showers. Freezing
spray after midnight. Waves building to 7 to 10 feet occasionally
to 13 feet.
.WEDNESDAY...North gales to 35 knots becoming northwest 15 to
25 knots in the afternoon. Freezing spray in the morning. A
slight chance of snow. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Northwest gales to 35 knots. Freezing spray. A chance
of snow showers. Waves building to 5 to 9 feet occasionally to
11 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Heavy freezing spray. Waves subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-090900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EST Mon Dec 8 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. A chance of snow. Waves 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by late morning, then veering north by mid afternoon. A
chance of snow showers. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
20 to 30 knots. A chance of snow showers. Freezing spray after
midnight. Waves building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...North gales to 35 knots becoming northwest 15 to
25 knots in the afternoon. Freezing spray. A slight chance of
snow. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. Waves building
to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 20 to 30 knots increasing to gales to
35 knots. Freezing spray. A chance of snow showers. Waves
building to 8 to 11 feet occasionally to 14 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-090900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EST Mon Dec 8 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of snow in the evening, then snow
likely after midnight. Waves building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast by
midnight, then increasing to 20 to 30 knots late. A chance of
snow showers in the evening, then snow likely after midnight.
Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...North gales to 35 knots becoming northwest 20 to
30 knots in the afternoon. A chance of snow. Waves building to
7 to 10 feet occasionally to 13 feet, then subsiding to 5 to
8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots. A chance of
snow showers. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 15 to 25 knots. Waves 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.FRIDAY...West gales to 35 knots becoming northwest gales to
40 knots. Snow showers likely. Freezing spray. Waves building to
10 to 14 feet occasionally to 18 feet, then subsiding to 8 to
11 feet occasionally to 14 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-090900-
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 Mon Dec 8 2025

.LATE THIS AFTERNOON...Southwest winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 15 to 25 knots. A
chance of snow in the evening, then snow likely after midnight.
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 veering northwest by late
morning, then diminishing to 10 to 20 knots by mid afternoon.
Snow showers likely in the morning, then a slight chance of snow
showers in the afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
20 to 30 knots. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...North gales to 35 knots. Freezing spray in the
morning. A chance of snow. Waves building to 6 to 10 feet
occasionally to 13 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots. Snow showers
likely in the evening. A chance of snow showers after midnight.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest in the
afternoon. A chance of snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. Snow showers
likely. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...West gales to 35 knots veering northwest. A chance of
snow showers, then snow showers. Freezing spray. Waves building
to 11 to 15 feet occasionally to 19 feet, then subsiding to 10 to
14 feet occasionally to 18 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-090900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EST Mon Dec 8 2025

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

Note, wave height forecasts are for ice free areas.

$$

LSZ261-090300-
MAFOR 0822/
Superior West 11530 12537 11627 12720 11610 11600. A chance of
snow showers Tuesday afternoon. Waves 2 to 4 feet building to 3
to 5 feet tonight. Waves 2 to 4 feet subsiding to 1 foot or less
Tuesday.

Superior North Central 13530 11527 11620 12720 11710. A chance of
snow showers Tuesday. Waves 3 to 5 feet tonight. Waves 2 to 4
feet Tuesday.

Superior South Central 11530 11540 11440 11537 11627 11620 11720
11620. A chance of snow showers Tuesday. Waves 2 to 4 feet
building to 3 to 6 feet tonight. Waves 2 to 4 feet subsiding to 1
to 3 feet Tuesday.

Superior East 13540 11547 11537 11637 11627 11620. Waves 3 to 5
feet building to 5 to 9 feet tonight. Waves 5 to 7 feet subsiding
to 3 to 5 feet Tuesday.

$$

WFO MQT

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