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FZUS63 KMQT 041408 CCA
GLFLS

Open Lake Forecast for Lake Superior...CORRECTED
National Weather Service Marquette MI
1008 AM 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 29.3 inch low developing over the Colorado Front Range today will
track northeast across northern Ontario on Sunday, 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 brings 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.


LSZ162-042000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1008 AM EDT Sat Oct 4 2025 /908 AM CDT Sat Oct 4 2025/

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

.REST OF TODAY...Southwest winds 10 to 20 knots backing east in
the afternoon, then becoming south 15 to 25 knots late. Waves
1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves 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 slight
chance of showers and thunderstorms by mid afternoon. Waves
building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...West gales to 35 knots becoming northwest 15 to
25 knots after midnight. A slight chance of showers and
thunderstorms through midnight. 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 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 2 to 4 feet.

$$

LSZ263-042000-
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-
1008 AM EDT Sat Oct 4 2025

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

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

$$

LSZ264-042000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1008 AM EDT Sat Oct 4 2025

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

.REST OF TODAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves 1 to 3 feet building to 2 to
4 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves 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 slight 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. A chance of showers and a slight chance
of thunderstorms through midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west 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 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 20 to 30 knots becoming north 5 to
15 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming south 15 to
25 knots. Waves building to 2 to 4 feet.

$$

LSZ265-042000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1008 AM EDT Sat Oct 4 2025

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

.REST OF TODAY...South winds 15 to 25 knots. Waves calm to 2 feet
building to 1 to 3 feet.
.TONIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots in the 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. A slight chance of thunderstorms through
midnight. A chance of showers. Waves subsiding to 2 to 4 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...Northwest 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.
.WEDNESDAY...Northwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ266-042000-
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-
1008 AM EDT Sat Oct 4 2025

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

.REST OF TODAY...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves 1 to 3 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots late. Waves building to 6 to 9 feet occasionally to
11 feet.
.SUNDAY NIGHT...South gales to 40 knots becoming west 20 to
30 knots after midnight. A chance of showers and a slight chance
of thunderstorms. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 4 to 7 feet occasionally to 9 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...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ267-042000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1008 AM EDT Sat Oct 4 2025

.REST OF TODAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves 1 to 3 feet building to 2 to
4 feet.
.TONIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then 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. Waves building to
5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...South gales to 35 knots becoming west 20 to
30 knots after midnight. A chance of showers through midnight. A
slight chance of thunderstorms. Showers after midnight. 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. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.TUESDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ261-042000-
MAFOR 0415/
Superior West 11420 19424 11320 13430 11440 11540 11440. Waves 1
to 3 feet this afternoon. Waves 2 to 4 feet building to 3 to 5
feet tonight. Waves 3 to 6 feet Sunday morning.

Superior North Central 12420 13430 13440. Waves 2 to 4 feet this
afternoon. Waves 2 to 4 feet building to 3 to 5 feet tonight.
Waves 3 to 6 feet Sunday morning.

Superior South Central 12420 13430 12420 11430. Waves 1 to 3 feet
building to 2 to 4 feet this afternoon. Waves 2 to 4 feet tonight
and Sunday morning.

Superior East 12420 14440 11430 11440. Waves 2 to 4 feet this
afternoon. Waves 3 to 6 feet tonight and Sunday 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