788
FZUS63 KMQT 071401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 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 will continue to move across the lake through the
early afternoon. Thereafter ridging returns and strengthens to 30.4
inches over the lake by Wednesday as high pressure 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-
1001 AM EDT Tue Oct 7 2025 /901 AM CDT Tue Oct 7 2025/

.REST OF TODAY...Northwest winds 20 to 30 knots diminishing to
10 to 20 knots. Waves 3 to 5 feet occasionally to 7 feet
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-
1001 AM EDT Tue Oct 7 2025

.REST OF TODAY...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots late. Waves 4 to 7 feet occasionally to 9 feet
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-
1001 AM EDT Tue Oct 7 2025

.REST OF TODAY...West winds 20 to 30 knots veering northwest in
the afternoon. Waves 4 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-
1001 AM EDT Tue Oct 7 2025

.REST OF TODAY...West winds 20 to 30 knots veering northwest in
the afternoon, then increasing to 30 knots with a few gale force
gusts to 35 knots possible late. Waves 2 to 4 feet 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-
1001 AM EDT Tue Oct 7 2025

.REST OF TODAY...West winds 20 to 30 knots veering northwest in
the afternoon, then increasing to 30 knots with a few gale force
gusts to 35 knots possible late. Waves 4 to 7 feet occasionally
to 9 feet 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-
1001 AM EDT Tue Oct 7 2025

.REST OF 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 3 to
5 feet occasionally to 7 feet 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.

$$

LSZ261-072000-
MAFOR 0715/
Superior West 11740 11730 11720 11710 11810 12800 11700. Waves 3
to 6 feet this afternoon. Waves 1 to 3 feet tonight. Waves 1 foot
or less Wednesday morning.

Superior North Central 13740 11830 11820 12810 11700. Waves 5 to
8 feet this afternoon. Waves 3 to 6 feet subsiding to 2 to 4 feet
tonight. Waves 1 to 2 feet Wednesday morning.

Superior South Central 11640 12740 11730 12820 11810 11700. Waves
2 to 4 feet building to 4 to 7 feet this afternoon. Waves 4 to 7
feet subsiding to 3 to 6 feet tonight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Wednesday morning.

Superior East 11640 13740 11830 11820 11810 11800. Waves 3 to 5
feet building to 5 to 9 feet this afternoon. Waves 6 to 9 feet
subsiding to 3 to 6 feet tonight. Waves 2 to 4 feet Wednesday
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