220
FZUS63 KMQT 060201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Sun Oct 5 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 29.4 inch low over far northern Minnesota and southern Ontario
will move to James Bay by late tonight, reaching far northern Quebec
as it deepens to 29.2 inches by Monday morning. This results in 29.7
inch troughing over Lake Superior through tonight. In its wake, a
30.3 inch high pressure moving across the Northern Plains builds
30.1 inch ridging back over Lake Superior Monday through Tuesday.
The ridge strengthens to 30.4 inches over the lake on Wednesday as
reinforcing high pressure moves overhead from the Canadian Prairies.
The high shifts east to New England by Thursday night, allowing 29.8
inch troughing to return to the lake as a 29.2 inch low moves over
Hudson Bay Friday morning.


LSZ162-060800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Sun Oct 5 2025 /901 PM CDT Sun Oct 5 2025/

...GALE WARNING IN EFFECT UNTIL 5 AM EDT /4 AM CDT/ MONDAY...

.REST OF TONIGHT...West gales to 40 knots becoming northwest
gales to 45 knots after midnight, then diminishing to 20 to
30 knots late. Waves 6 to 9 feet occasionally to 11 feet
subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 10 to 20 knots backing southwest late.
Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.FRIDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-060800-
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-
1001 PM EDT Sun Oct 5 2025

...GALE WARNING IN EFFECT UNTIL 5 AM EDT MONDAY...

.REST OF TONIGHT...Southwest gales to 40 knots becoming northwest
gales to 35 knots after midnight, then diminishing to 20 to
30 knots late. A slight chance of showers by midnight. Waves 7 to
10 feet occasionally to 13 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...Northwest winds 10 to 20 knots backing southwest late.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.MONDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots veering northwest by mid
afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.FRIDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-060800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Sun Oct 5 2025

...GALE WARNING IN EFFECT UNTIL 2 AM EDT MONDAY...

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

$$

LSZ265-060800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Sun Oct 5 2025

...GALE WARNING IN EFFECT UNTIL 2 AM EDT MONDAY...

.REST OF TONIGHT...South gales to 40 knots becoming west gales to
35 knots after midnight, then veering northwest late. A slight
chance of thunderstorms by midnight. A chance of showers. Waves
3 to 6 feet occasionally to 8 feet.
.MONDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 15 to
25 knots. Waves calm to 2 feet.
.TUESDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 15 to 25 knots veering southwest. A
chance of showers. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-060800-
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-
1001 PM EDT Sun Oct 5 2025

...GALE WARNING IN EFFECT UNTIL 2 AM EDT MONDAY...

.REST OF TONIGHT...South gales to 35 knots veering west after
midnight, then becoming northwest 20 to 30 knots late. A chance
of showers and a slight chance of thunderstorms. Waves 7 to
10 feet occasionally to 13 feet subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...Northwest winds 20 to 30 knots diminishing to 5 to
15 knots. A slight chance of showers through early afternoon.
Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of showers through
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots veering northwest by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.THURSDAY...South winds 15 to 25 knots veering southwest. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.

$$

LSZ267-060800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Sun Oct 5 2025

.REST OF TONIGHT...South winds to 30 knots with a few gale force
gusts to 35 knots possible veering southwest after midnight, then
becoming west 20 to 30 knots late. A chance of showers by
midnight. A slight chance of thunderstorms. Showers after
midnight. Waves 4 to 8 feet occasionally to 10 feet.
.MONDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of showers through early afternoon. Waves
subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. A chance of showers
through midnight. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.THURSDAY...South winds 15 to 25 knots veering southwest. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-060800-
MAFOR 0603/
Superior West...GALE WARNING IN EFFECT...11650 11740 11730 11720
12610 11520 11620. Waves 5 to 8 feet subsiding to 3 to 6 feet
overnight. Waves 3 to 5 feet subsiding to 1 to 3 feet Monday.
Waves 1 to 2 feet Monday evening.

Superior North Central...GALE WARNING IN EFFECT...11550 11750
11740 11730 11720 11620 12520. Waves 6 to 9 feet overnight. Waves
5 to 8 feet subsiding to 1 to 3 feet Monday. Waves 2 to 3 feet
Monday evening.

Superior South Central...GALE WARNING IN EFFECT...11550 11640
11740 11730 12720 12610. A chance of showers overnight. Waves 4
to 7 feet overnight. Waves 3 to 6 feet subsiding to 2 to 4 feet
Monday. Waves 1 to 2 feet Monday evening.

Superior East...GALE WARNING IN EFFECT...11450 11546 11740 12730
11720 11710 11610. Waves 6 to 10 feet subsiding to 4 to 7 feet
overnight. Waves 5 to 7 feet subsiding to 3 to 5 feet Monday.
Waves 2 to 4 feet Monday evening.

$$

WFO MQT

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weather.gov/mqt/glftable

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weather.gov/greatlakes