901
FZUS63 KMQT 111500
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EST Thu Dec 11 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...

As a 29.1 inch low pushes farther into the Maritime Provinces this
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving
over the Mississippi Valley. This ridge then moves over the Great
Lakes Friday morning before a trough quickly swings south from
northern Ontario, deepening from 29.9 inches to 29.7 inches through
the afternoon to evening hours of Friday. As this low exits to the
east Saturday, a 30.6 inch high settles over the Dakotas Saturday
evening. This high builds to 30.7 inches over Illinois Sunday
evening and towards the Virginias by Monday morning. In its wake, a
29.9 inch trough will pass over Lake Superior Monday afternoon
associated with a 29.7 inch low over Hudson Bay. 30.1 inch ridging
resumes over the lake Monday night into Tuesday ahead of a 29.2 inch
low moving into Manitoba Tuesday afternoon.


LSZ162-112100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EST Thu Dec 11 2025 /900 AM CST Thu Dec 11 2025/

.REST OF TODAY...Northwest winds 5 to 15 knots backing west.
Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots becoming northwest 20 to
30 knots by mid afternoon. Snow showers in the morning, then a
chance of snow showers in the afternoon. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Northwest gales to 35 knots. A chance of snow
showers. Heavy freezing spray after midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. A chance of snow showers. Waves 3 to
6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming southwest gales
to 35 knots. Waves subsiding to calm to 2 feet, then building to
5 to 8 feet occasionally to 10 feet.
.MONDAY...West winds 20 to 30 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-112100-
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 Thu Dec 11 2025

.REST OF TODAY...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots increasing to 15 to 25 knots.
A chance of snow showers in the morning, then snow showers in the
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Heavy freezing spray. A chance
of snow showers. Waves building to 6 to 9 feet occasionally to
11 feet.
.SATURDAY...Northwest gales to 35 knots. Heavy freezing spray. A
chance of snow showers. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of snow showers in the evening.
Heavy freezing spray. Waves subsiding to 3 to 6 feet occasionally
to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming southwest gales
to 40 knots. Freezing spray. A chance of snow showers. Waves
subsiding to calm to 2 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.MONDAY...West gales to 35 knots becoming northwest 10 to
20 knots. Freezing spray. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-112100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EST Thu Dec 11 2025

.REST OF TODAY...North winds 10 to 20 knots becoming northwest
5 to 15 knots. Waves 3 to 5 feet occasionally to 7 feet subsiding
to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots backing northwest late.
Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots increasing to 15 to 25 knots.
A chance of snow showers in the morning, then snow showers likely
in the afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Heavy freezing spray. Snow
showers likely in the evening. A chance of snow showers after
midnight. Waves building to 8 to 11 feet occasionally to 14 feet.
.SATURDAY...Northwest gales to 35 knots. Heavy freezing spray. A
chance of snow showers. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.SATURDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Heavy freezing spray. A chance of snow
showers. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...Northwest winds 20 to 30 knots becoming southwest gales
to 35 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 1 to 3 feet, then building to 8 to 11 feet
occasionally to 14 feet.
.MONDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. Freezing spray. A chance of snow showers. Waves
subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-112100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EST Thu Dec 11 2025

.REST OF TODAY...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots by mid afternoon. A slight chance of freezing
drizzle and snow showers. Waves 3 to 5 feet occasionally to
7 feet subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots backing west late. A
slight chance of snow showers in the evening. Waves subsiding to
calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Snow showers likely in the afternoon. Waves
building to 2 to 4 feet.
.FRIDAY NIGHT...West gales to 35 knots becoming northwest gales
to 40 knots after midnight. Freezing spray. Snow showers. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY...Northwest gales to 40 knots. 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.
.SATURDAY NIGHT...Northwest gales to 40 knots becoming north
gales to 35 knots after midnight. Freezing spray. Snow showers in
the evening. A chance of snow showers after midnight. Waves
building to 8 to 12 feet occasionally to 15 feet.
.SUNDAY...Northwest winds 20 to 30 knots backing southwest.
Freezing spray. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-112100-
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 Thu Dec 11 2025

.REST OF TODAY...North winds 15 to 25 knots backing northwest. A
chance of snow showers and a slight chance of freezing drizzle.
Waves 5 to 8 feet occasionally to 10 feet subsiding to 2 to
4 feet.
.TONIGHT...Northwest winds 10 to 20 knots. A slight chance of
snow showers. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. A chance of snow showers. Waves
building to 2 to 4 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest after
midnight. Freezing spray. Snow showers. Waves building to 10 to
14 feet occasionally to 18 feet.
.SATURDAY...Northwest gales to 40 knots. Freezing spray. Snow
showers. Waves 10 to 14 feet occasionally to 18 feet.
.SATURDAY NIGHT...North gales to 35 knots. Freezing spray. Snow
showers in the evening. A chance of snow showers after midnight.
Waves subsiding to 9 to 12 feet occasionally to 15 feet.
.SUNDAY...North winds 20 to 30 knots becoming southwest gales to
35 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 2 to 4 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.MONDAY...West gales to 35 knots becoming northwest 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 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-112100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EST Thu Dec 11 2025

.REST OF TODAY...North winds 15 to 25 knots backing northwest by
mid afternoon. A slight chance of snow showers. Waves 4 to 7 feet
occasionally to 9 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots. A slight chance of
snow showers. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing southwest by mid
afternoon. A chance of snow showers. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. Snow showers. Freezing spray after
midnight. Waves building to 10 to 14 feet occasionally to
18 feet.
.SATURDAY...Northwest gales to 35 knots. Freezing spray. Snow
showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots. Freezing spray.
Snow showers in the evening. A chance of snow showers after
midnight. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...North winds 15 to 25 knots becoming southwest gales to
35 knots. Freezing spray. A chance of snow showers, then snow
showers likely. Waves subsiding to 2 to 4 feet, then building to
5 to 8 feet occasionally to 10 feet.
.MONDAY...Southwest gales to 35 knots becoming northwest 15 to
25 knots. Freezing spray. Snow showers, then a chance of snow
showers. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-112100-
MAFOR 1116/
Superior West 15600 11610 11617. Waves 2 feet or less.

Superior North Central 11720 12710 12810 11700 11710 11610. Waves
2 to 4 feet subsiding to 1 to 3 feet this afternoon. Waves 1 to 2
feet tonight and Friday morning.

Superior South Central 13720 13710 12610. Waves 3 to 6 feet this
afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight.
Waves 1 to 2 feet Friday morning.

Superior East 11820 12720 14710 11710. Waves 3 to 6 feet this
afternoon. Waves 2 to 4 feet tonight. Waves 1 to 2 feet Friday
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