541
FZUS63 KMQT 020301
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EST Mon Dec 1 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 weak 30.0 inch trough is dropping over Lake Superior tonight. 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.


LSZ162-020900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EST Mon Dec 1 2025 /900 PM CST Mon Dec 1 2025/

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

Note, wave height forecasts are for ice free areas.

$$

LSZ263-020900-
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 PM EST Mon Dec 1 2025

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

Note, wave height forecasts are for ice free areas.

$$

LSZ264-020900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EST Mon Dec 1 2025

.REST OF TONIGHT...West winds 10 to 20 knots veering northwest
late. Snow showers likely. Waves 4 to 7 feet occasionally to
9 feet subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by late morning, then increasing to 20 to 30 knots by
mid afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots veering northwest
late. Snow showers. Waves building to 6 to 9 feet occasionally to
11 feet.
.WEDNESDAY...Northwest gales to 35 knots. Freezing spray. A
chance of snow showers. Waves building to 8 to 11 feet
occasionally to 14 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots. 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 in
the afternoon. Freezing spray 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.
.THURSDAY NIGHT...Southwest gales to 35 knots veering west after
midnight. Freezing spray. Snow showers likely. Waves building to
7 to 11 feet occasionally to 14 feet.
.FRIDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. A chance of snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-020900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EST Mon Dec 1 2025

.REST OF TONIGHT...West winds 15 to 25 knots. A slight chance of
snow showers. Waves 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots backing southwest. Waves
subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots veering west
late. A chance of snow showers in the evening, then snow showers
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...Northwest gales to 40 knots. Snow showers. Freezing
spray in the afternoon. Waves building to 8 to 11 feet
occasionally to 14 feet.
.WEDNESDAY NIGHT...Northwest gales to 40 knots. Freezing spray.
Snow showers likely in the evening. A chance of snow showers
after midnight. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.THURSDAY...Northwest winds 20 to 30 knots backing southwest in
the afternoon. Freezing spray in the morning. A chance of snow
showers. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Southwest gales to 35 knots diminishing 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.
.FRIDAY...West winds 20 to 30 knots. Snow showers likely. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-020900-
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 PM EST Mon Dec 1 2025

.REST OF TONIGHT...West winds 15 to 25 knots. A chance of snow
showers. Waves 4 to 7 feet occasionally to 9 feet subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of snow showers in the morning. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots veering west
late. A chance of snow showers in the evening, then snow showers
after midnight. Waves building to 6 to 9 feet occasionally to
11 feet.
.WEDNESDAY...Northwest gales to 40 knots. Snow showers. Freezing
spray in the afternoon. Waves building to 10 to 14 feet
occasionally to 18 feet.
.WEDNESDAY NIGHT...Northwest gales to 40 knots. Freezing spray.
Snow showers. Waves building to 11 to 15 feet occasionally to
19 feet, then subsiding to 10 to 14 feet occasionally to 18 feet.
.THURSDAY...Northwest gales to 35 knots becoming west 20 to
30 knots in the afternoon. Freezing spray in the morning. Snow
showers likely in the morning, then a chance of snow showers in
the afternoon. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.THURSDAY NIGHT...Southwest winds 20 to 30 knots. Freezing spray.
A chance of snow showers in the evening. Snow showers likely
after midnight. Waves building to 7 to 10 feet occasionally to
13 feet.
.FRIDAY...Southwest winds 15 to 25 knots veering west. Snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots veering north. A
chance of snow showers, then snow showers likely. Waves subsiding
to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-020900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EST Mon Dec 1 2025

.REST OF TONIGHT...Southwest winds 15 to 25 knots veering west by
midnight. A chance of snow showers. Waves 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots. A slight chance of snow showers. Waves subsiding to
2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots increasing to
30 knots with a few gale force gusts to 35 knots possible late. A
chance of snow showers in the evening, then snow showers after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...West gales to 35 knots becoming northwest gales to
40 knots in the afternoon. Snow showers. Freezing spray in the
afternoon. Waves building to 10 to 14 feet occasionally to
18 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots. Freezing spray.
Snow showers. Waves subsiding to 10 to 14 feet occasionally to
18 feet.
.THURSDAY...Northwest winds 20 to 30 knots backing west in the
afternoon. Freezing spray in the morning. Snow showers. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...Southwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Freezing spray. Snow showers.
Waves building to 6 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 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots veering north. Snow
showers likely. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-020900-
MAFOR 0204/
Superior West 11630 12620 11520 12530 11540 11547. Waves 3 to 5
feet subsiding to 2 to 4 feet overnight. Waves 2 to 4 feet
building to 3 to 5 feet Tuesday. Waves 3 to 6 feet Tuesday
evening.

Superior North Central 11637 11727 12620 12530 12547. Waves 3 to
6 feet overnight. Waves 2 to 4 feet building to 3 to 6 feet
Tuesday. Waves 5 to 8 feet Tuesday evening.

Superior South Central 13630 11620 12520 12530. Waves 2 to 4 feet
overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet Tuesday.
Waves 2 to 4 feet Tuesday evening.

Superior East 14620 12520 12530. A chance of snow showers
overnight, Tuesday morning, and Tuesday evening. Waves 3 to 6
feet.

$$

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