920
FZUS63 KMQT 070801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Tue Oct 7 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 30.0 inch trough moves through the lake this morning. Ridging
returns this afternoon and strengthens to 30.4 inches over the lake
by Wednesday as the responsible high transits the Upper Great Lakes.
The high shifts east to New England by Thursday night at 30.5
inches, allowing 30.1 inch troughing to return to the lake as a 29.4
inch low moves over Hudson Bay. Ridging of 30.1 inches builds back
over the lake Friday night.


LSZ162-072000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Tue Oct 7 2025 /301 AM CDT Tue Oct 7 2025/

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TODAY...West winds 15 to 25 knots veering northwest in the
afternoon, then diminishing to 10 to 20 knots late. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. 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...South winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. A chance of showers. Waves 1 to
3 feet.
.FRIDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots becoming southeast 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ263-072000-
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 Tue Oct 7 2025

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...West winds 20 to 30 knots veering northwest in the
afternoon, then diminishing to 15 to 25 knots late. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
2 to 4 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds less than 10 knots becoming
southwest 5 to 15 knots in the 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...South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 15 to 25 knots. A chance of
showers. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.FRIDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-072000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Tue Oct 7 2025

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...West winds 20 to 30 knots veering northwest in the
afternoon. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing southwest
late. 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 10 to 20 knots backing south by mid
afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers. Waves building to 2 to
4 feet.
.FRIDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-072000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Tue Oct 7 2025

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 1 to
3 feet.
.TODAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots in the afternoon, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. Waves building to
3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then becoming southwest 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 15 to 25 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots veering north. Waves calm to
2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 1 to 3 feet.

$$

LSZ266-072000-
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 Tue Oct 7 2025

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet.
.TODAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots in the afternoon, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. Waves building to
6 to 9 feet occasionally to 11 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the 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 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering north. A chance
of showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-072000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Tue Oct 7 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...West winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then becoming northwest to 30 knots with a few
gale force gusts to 35 knots possible late. Waves building to
7 to 10 feet occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest in the
afternoon, then diminishing to 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing southeast. A
chance of showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. Waves building to
2 to 4 feet.

$$

LSZ261-071400-
MAFOR 0709/
Superior West 12630 11740 11730 11720 11710 11810 11800. Waves 2
to 4 feet building to 3 to 6 feet today. Waves 1 to 3 feet
tonight.

Superior North Central 11630 11640 13740 11830 11820 11810. Waves
3 to 5 feet building to 5 to 8 feet today. Waves 3 to 6 feet
subsiding to 2 to 4 feet tonight.

Superior South Central 11630 12640 12740 11730 12820. Waves 2 to
4 feet building to 4 to 7 feet today. Waves 4 to 7 feet subsiding
to 3 to 6 feet tonight.

Superior East 11620 11630 11640 13740 11830 11820. Waves 2 to 4
feet building to 5 to 9 feet today. Waves 6 to 9 feet subsiding
to 3 to 6 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