703
FZUS63 KMQT 050201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Sat Oct 4 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 eastern South Dakota will track northeast into
northern Minnesota by Sunday morning and will reach northern Ontario
by Sunday evening. This low will continue to track northeast,
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 Sunday night. In its wake, 30.3 inch high pressure moving
across the Northern Plains builds 30.1 inch ridging back over Lake
Superior Monday through Tuesday. High pressure 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.


LSZ162-050800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Sat Oct 4 2025 /901 PM CDT Sat Oct 4 2025/

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

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

$$

LSZ263-050800-
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 Sat Oct 4 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

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

$$

LSZ264-050800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Sat Oct 4 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

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

$$

LSZ265-050800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Sat Oct 4 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

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

$$

LSZ266-050800-
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 Sat Oct 4 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TONIGHT...South winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves 3 to 6 feet occasionally to
8 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots late. A slight chance of showers by mid afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.SUNDAY NIGHT...South gales to 35 knots veering southwest after
midnight, then becoming west 15 to 25 knots late. A slight chance
of thunderstorms through midnight. A chance of showers. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves subsiding to 1 to 3 feet, then
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 calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 2 to 4 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.

$$

LSZ267-050800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Sat Oct 4 2025

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

$$

LSZ261-050800-
MAFOR 0503/
Superior West 11430 11440 11540 13440 12540. A chance of showers
Sunday evening. Waves 2 to 4 feet building to 3 to 5 feet
overnight. Waves 3 to 6 feet Sunday. Waves 4 to 7 feet Sunday
evening.

Superior North Central 11430 15440 11540. A chance of showers
Sunday evening. Waves 2 to 4 feet building to 3 to 5 feet
overnight. Waves 3 to 6 feet building to 4 to 7 feet Sunday.
Waves 5 to 8 feet Sunday evening.

Superior South Central 11430 12420 11430 12440 11450 11440. Waves
2 to 4 feet overnight. Waves 2 to 4 feet building to 3 to 5 feet
Sunday. Waves 3 to 6 feet Sunday evening.

Superior East 12440 11430 13440 12450. A chance of showers Sunday
evening. Waves 3 to 6 feet overnight. Waves 3 to 6 feet building
to 5 to 7 feet Sunday. Waves 6 to 10 feet Sunday evening.

$$

WFO MQT

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