237
FZUS63 KMQT 301500
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM 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 Lake Huron tracks across Georgian Bay
this afternoon while 30.6 inch high pressure expands over the
Northern Plains. As the low quickly moves to the mouth of the St
Lawrence River Monday morning, the high will weaken slightly to 30.5
inches just southwest of the Great Lakes. This high weakens to 30.3
inches over the Lower Great Lakes Monday evening while a weak 30.0
inch trough descends over the lake from northern Ontario. After the
trough briefly deepens to 29.9 inches, a weak 30.0 inch ridge moves
over the lake Tuesday morning as a 29.7 inch Clipper Low forms over
Saskatchewan. The low weakens slightly to 29.8 inches Tuesday
evening as it approaches Lake Superior. By Wednesday afternoon, the
low will deepen to 29.6 inches south of James Bay while a 30.5 inch
high builds over the High Plains. As the low departs to the east,
the high shifts over the Central Plains Thursday morning, moving
south of the Great Lakes Thursday evening.


LSZ162-302100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EST Sun Nov 30 2025 /900 AM CST Sun Nov 30 2025/

.REST OF TODAY...North winds 15 to 25 knots backing northwest. A
slight chance of snow showers late in the morning. Waves 4 to
7 feet occasionally to 9 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots backing west by
midnight. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.MONDAY...West winds 20 to 30 knots backing southwest. A slight
chance of snow showers in the afternoon. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of snow showers. Waves
subsiding to calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. A chance of snow showers in the evening, then
snow showers likely after midnight. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. A chance of snow
showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.THURSDAY...West winds 20 to 30 knots becoming southwest gales to
35 knots. 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.

$$

LSZ263-302100-
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 Sun Nov 30 2025

.REST OF TODAY...North winds 20 to 30 knots becoming northwest
15 to 25 knots by mid afternoon. A chance of snow showers. Waves
5 to 8 feet occasionally to 10 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then increasing to 15 to 25 knots late. A
slight chance of 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 becoming southwest to
30 knots with a few gale force gusts to 35 knots possible. A
slight chance of snow showers. Waves building to 6 to 10 feet
occasionally to 13 feet.
.MONDAY NIGHT...West 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.
.TUESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. Snow showers likely after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest gales to 35 knots. A chance of snow
showers. Waves building to 4 to 8 feet occasionally to 10 feet.
.THURSDAY...West gales to 35 knots backing southwest. Freezing
spray. A chance of snow showers. Waves building to 6 to 10 feet
occasionally to 13 feet.

$$

LSZ264-302100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EST Sun Nov 30 2025

.REST OF TODAY...North winds 20 to 30 knots backing northwest by
mid afternoon. A chance of snow showers. Waves 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then increasing to 15 to 25 knots late. A
slight chance of snow showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds to 30 knots with a few gale force gusts to
35 knots possible. A chance of snow showers. Waves building to
7 to 10 feet occasionally to 13 feet.
.MONDAY NIGHT...West 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.
.TUESDAY...West winds 10 to 20 knots backing southwest in the
afternoon. A slight chance of snow showers in the morning. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots veering west
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 gales to 35 knots. Freezing spray. A
chance of snow showers. Waves building to 6 to 10 feet
occasionally to 13 feet.
.THURSDAY...Northwest gales to 35 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.

$$

LSZ265-302100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EST Sun Nov 30 2025

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

.REST OF TODAY...North gales to 35 knots backing northwest by mid
afternoon. Snow showers likely late in the morning, then a chance
of snow showers in the afternoon. Waves 8 to 11 feet occasionally
to 14 feet subsiding to 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. A slight chance of
snow showers. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.MONDAY...Southwest winds 20 to 30 knots. 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...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of snow showers. Waves 2 to
4 feet.
.TUESDAY...West winds 15 to 25 knots backing southwest 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 veering west
after midnight. Snow showers likely after midnight. Waves
building to 2 to 4 feet.
.WEDNESDAY...Northwest gales to 40 knots. Snow showers. Freezing
spray. Waves building to 6 to 10 feet occasionally to 13 feet.
.THURSDAY...West gales to 35 knots backing southwest. A chance of
snow showers. Waves subsiding to 2 to 4 feet, then building to
3 to 5 feet occasionally to 7 feet.

$$

LSZ266-302100-
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 Sun Nov 30 2025

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

.REST OF TODAY...North gales to 40 knots backing northwest by mid
afternoon. A chance of snow showers. Waves 8 to 11 feet
occasionally to 14 feet subsiding to 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. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds 20 to 30 knots backing southwest. A chance
of snow showers. Waves building to 7 to 10 feet occasionally to
13 feet.
.MONDAY NIGHT...West 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.
.TUESDAY...West winds 15 to 25 knots backing southwest in the
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots. Snow showers
likely after midnight. Waves building to 4 to 7 feet occasionally
to 9 feet.
.WEDNESDAY...Northwest gales to 40 knots. Freezing spray. Snow
showers. Waves building to 10 to 14 feet occasionally to 18 feet.
.THURSDAY...Northwest gales to 35 knots backing southwest.
Freezing spray. A chance of snow showers. Waves subsiding to 6 to
9 feet occasionally to 11 feet, then building to 7 to 10 feet
occasionally to 13 feet.

$$

LSZ267-302100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EST Sun Nov 30 2025

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

.REST OF TODAY...North gales to 35 knots. A chance of snow
showers. Waves 5 to 9 feet occasionally to 11 feet, then
subsiding to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...North winds 20 to 30 knots becoming northwest 15 to
25 knots by midnight, then becoming west 10 to 20 knots late. 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.
.MONDAY...West winds 15 to 25 knots becoming southwest 20 to
30 knots. A chance of snow showers. 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 after midnight. Snow showers likely. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon. Snow showers likely in the morning,
then a chance of snow showers in the afternoon. Waves subsiding
to 2 to 4 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 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest gales to 35 knots. Snow showers. Freezing
spray. 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.

$$

LSZ261-302100-
MAFOR 3016/
Superior West 11830 12730 11720 12620 11640 11540. Waves 3 to 6
feet this afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet
tonight. Waves 3 to 6 feet building to 4 to 7 feet Monday
morning.

Superior North Central 11840 12740 12730 11620 12640. A chance of
snow showers late this morning. Waves 5 to 7 feet this afternoon.
Waves 4 to 7 feet subsiding to 3 to 5 feet tonight. Waves 3 to 6
feet building to 5 to 8 feet Monday morning.

Superior South Central...GALE WARNING IN EFFECT...11857 12750
11740 11730 11620 11630 11540. Waves 6 to 10 feet this afternoon.
Waves 5 to 9 feet subsiding to 3 to 5 feet tonight. Waves 2 to 4
feet building to 3 to 5 feet Monday morning.

Superior East...GALE WARNING IN EFFECT...12840 12740 11730 11620
12630. A chance of snow showers. Waves 5 to 8 feet this
afternoon. Waves 5 to 9 feet subsiding to 4 to 6 feet tonight.
Waves 3 to 6 feet Monday 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