318
FZUS63 KMQT 110801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Sat Oct 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...

30.2 inch ridging builds over Lake Superior through today. This
ridge gradually weakens Sunday as the next system organizes upstream
in the Northern Plains. By early Monday, a weakening 29.4 inch low
pressure moves from Manitoba into far northern Ontario, causing a
29.9 inch trough to move over Lake Superior Sunday and Monday.
Ridging returns late Monday into Tuesday, building to 30.4 inches by
Tuesday morning. The ridge remains in place through midweek while
slowly weakening.


LSZ162-112000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sat Oct 11 2025 /301 AM CDT Sat Oct 11 2025/

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots late. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots backing southeast in the
afternoon. A slight chance of showers by mid afternoon. Waves
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots. Showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ263-112000-
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-
401 AM EDT Sat Oct 11 2025

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...Southeast winds 5 to 15 knots backing east late. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 15 to 25 knots becoming south 20 to
30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 15 to 25 knots backing southeast in the
afternoon, then increasing to 20 to 30 knots late. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots. A chance of showers
through midnight, then showers after midnight. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A chance of showers through early
afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ264-112000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sat Oct 11 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY
MORNING...

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TODAY...East winds 5 to 15 knots veering southeast in the
afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...South winds 20 to 30 knots becoming southeast gales to
35 knots in the afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY NIGHT...South gales to 35 knots. A slight chance of
showers through midnight, then showers after midnight. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west by mid
afternoon. A chance of showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-112000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sat Oct 11 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY
MORNING...

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...East winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...South winds 15 to 25 knots becoming southeast 20 to
30 knots in the afternoon, then increasing to gales to 35 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...South gales to 35 knots. A slight chance of
showers through midnight, then showers likely after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. Showers likely through early afternoon. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves building to
1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ266-112000-
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-
401 AM EDT Sat Oct 11 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY
MORNING...

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TODAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots becoming southeast 20 to
30 knots in the afternoon, then increasing to gales to 35 knots
late. Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...South gales to 35 knots. A chance of showers
after midnight. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...South winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. Showers through early afternoon, then a chance
of showers by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.

$$

LSZ267-112000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sat Oct 11 2025

.EARLY THIS MORNING...North winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
Waves building to 1 to 3 feet.
.SUNDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. A slight chance of showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots by mid afternoon. Showers. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...Northwest 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...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.

$$

LSZ261-111400-
MAFOR 1109/
Superior West 11200 13300 11210 11220 11330 11430. Waves 2 feet
or less today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

Superior North Central 11110 11210 11300 11310 12320 11330 11430.
Waves 2 to 4 feet subsiding to 1 to 3 feet today. Waves 1 to 3
feet building to 3 to 5 feet tonight.

Superior South Central 11820 11110 11200 11210 11220 11320 11330
11430. Waves 3 to 6 feet subsiding to 1 to 2 feet today. Waves 1
to 3 feet tonight.

Superior East 11820 11120 11210 12200 11310 12320. Waves 3 to 5
feet subsiding to 1 to 3 feet today. Waves 1 to 3 feet tonight.

$$

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