380
FZUS63 KMQT 302101
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EST Sun Nov 30 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 over southern Ontario this afternoon
continues east towards the mouth of the St. Lawrence River tonight.
Meanwhile, a 30.6 inch high pressure over the Northern Plains
weakens slightly to 30.5 inches as it dives towards the Chicago area
late tonight. This high continues to weaken to 30.4 inches over the
Lower Great Lakes Monday evening while a weak 30.0 inch trough
descends over Lake Superior from northern Ontario. As the trough
deepens to 29.9 inches on Tuesday, a 29.7 inch low dives through
southern Saskatchewan into the Northern Plains. The low weakens
slightly to 29.8 inches Tuesday evening as it approaches Lake
Superior. By Wednesday afternoon, the low deepens to 29.6 inches
south of James Bay while a 30.5 inch high builds over the High
Plains. The high shifts over the Central Plains Thursday morning
before moving between the Great Lakes and Ohio River Valley Thursday
evening. The high arrives over the Mid-Atlantic states on Friday as
troughing down to 29.7 inches develops over Lake Superior.


LSZ162-010900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EST Sun Nov 30 2025 /300 PM CST Sun Nov 30 2025/

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

$$

LSZ263-010900-
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 Sun Nov 30 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots backing west by
midnight, then increasing to 15 to 25 knots late. Isolated snow
showers after midnight. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds 20 to 30 knots backing southwest by mid
afternoon. Isolated snow showers. Waves building to 5 to 9 feet
occasionally to 11 feet.
.MONDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. A chance of snow showers. Waves subsiding
to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots veering west
after midnight. A chance of snow showers in the evening, then
snow showers likely after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon. A chance of snow showers. Freezing
spray in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. Freezing spray. A chance of snow
showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots backing southwest. Freezing
spray. A chance of snow showers. Waves building to 6 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.

$$

LSZ264-010900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EST Sun Nov 30 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 5 to
8 feet occasionally to 10 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then increasing to 15 to 25 knots late.
Scattered snow showers after midnight. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds 20 to 30 knots. Scattered snow showers.
Waves building to 6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. A chance of snow showers. Waves subsiding
to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. A chance of snow showers in the
evening, then snow showers likely after midnight. Waves building
to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon. A chance of snow showers. Freezing
spray in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots. Heavy freezing
spray. A chance of snow showers. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.THURSDAY...Northwest winds 20 to 30 knots backing southwest.
Freezing spray. A chance of snow showers. Waves subsiding to 4 to
7 feet occasionally to 9 feet, then building to 8 to 11 feet
occasionally to 14 feet.
.FRIDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 2 to 4 feet.

$$

LSZ265-010900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EST Sun Nov 30 2025

...GALE WARNING IN EFFECT UNTIL 7 PM EST THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Scattered
snow showers. Waves 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then backing west late. Isolated snow
showers. Waves subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west by late
morning, then backing southwest by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots by midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. A slight chance of snow showers in the
morning. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of snow showers in the
evening, then snow showers likely after midnight. Waves building
to 2 to 4 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon. Snow showers. Waves building to
6 to 9 feet occasionally to 11 feet.
.WEDNESDAY NIGHT...Northwest gales to 40 knots. Freezing spray.
Snow showers likely. Waves building to 6 to 10 feet occasionally
to 13 feet.
.THURSDAY...West winds 20 to 30 knots backing southwest. Freezing
spray. A chance of snow showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.

$$

LSZ266-010900-
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 Sun Nov 30 2025

...GALE WARNING IN EFFECT UNTIL 9 PM EST THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Scattered
snow showers, possibly mixed with sleet. Waves 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...Northwest gales to 35 knots diminishing to 15 to
25 knots by midnight, then backing west late. Scattered snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 20 to 30 knots backing southwest by late
morning, then becoming west 15 to 25 knots by mid afternoon.
Scattered snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 6 to 9 feet occasionally
to 11 feet.
.MONDAY NIGHT...West winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Snow showers likely after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon. Snow showers. Freezing spray in the
afternoon. Waves building to 9 to 12 feet occasionally to
15 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots. Freezing spray.
Snow showers. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 10 to 14 feet occasionally to 18 feet.
.THURSDAY...Northwest winds 20 to 30 knots backing southwest.
Freezing spray. A chance of snow showers. Snow showers likely.
Waves subsiding to 6 to 9 feet occasionally to 11 feet, then
building to 7 to 10 feet occasionally to 13 feet.
.FRIDAY...Southwest winds 15 to 25 knots veering west. A chance
of snow showers, then snow showers likely. Waves subsiding to
2 to 4 feet.

$$

LSZ267-010900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EST Sun Nov 30 2025

...GALE WARNING IN EFFECT UNTIL 7 PM EST THIS EVENING...

.LATE THIS AFTERNOON...North gales to 35 knots. Snow showers.
Waves 6 to 9 feet occasionally to 11 feet.
.TONIGHT...North gales to 35 knots becoming northwest 15 to
25 knots by midnight, then becoming west 10 to 20 knots late.
Numerous snow showers in the evening, then scattered snow showers
after midnight. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.MONDAY...West winds 15 to 25 knots becoming southwest 20 to
30 knots. Scattered snow showers in the morning. Waves subsiding
to 3 to 5 feet occasionally to 7 feet, then building to 4 to
7 feet occasionally to 9 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots by midnight. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Snow showers likely after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 35 knots veering northwest in the
afternoon. Snow showers. Waves building to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. 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.
.THURSDAY...Northwest winds 20 to 30 knots backing southwest.
Freezing spray. Snow showers. Waves subsiding to 6 to 9 feet
occasionally to 11 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.FRIDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. Snow showers. Waves subsiding to 2 to 4 feet.

$$

LSZ261-010300-
MAFOR 3022/
Superior West 11730 11720 11620 12630 11640 12540. Waves 3 to 5
feet subsiding to 2 to 4 feet tonight. Waves 3 to 6 feet building
to 4 to 7 feet Monday.

Superior North Central 11740 12730 11620 11630 19637 13640 19647.
Waves 5 to 8 feet subsiding to 3 to 6 feet tonight. Waves 3 to 6
feet building to 5 to 9 feet Monday.

Superior South Central...GALE WARNING IN EFFECT...12740 19747
11730 11620 19627 11630 19637 11540 11640 11630. Waves 5 to 9
feet subsiding to 3 to 6 feet tonight. Waves 3 to 6 feet Monday.

Superior East...GALE WARNING IN EFFECT...11757 11747 11730 19737
11720 19727 11620 19627 11640 19647 11540 11530. Waves 5 to 9
feet subsiding to 4 to 6 feet tonight. Waves 3 to 5 feet building
to 5 to 7 feet Monday.

$$

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