609
FZUS63 KMQT 072001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM 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...

Ridging will build over the lake tonight and strengthen to 30.4
inches 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.


LSZ162-080800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Tue Oct 7 2025 /301 PM CDT Tue Oct 7 2025/

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 1 to
3 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing southwest in
the afternoon, then backing south late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then veering southwest late. Waves
calm to 2 feet.
.THURSDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 2 to 4 feet.
.SUNDAY...Southeast winds 15 to 25 knots veering south. A chance
of showers, then showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ263-080800-
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 PM EDT Tue Oct 7 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 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 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 late. Waves building to 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming south 20 to
30 knots by mid afternoon. 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. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming south 15 to
25 knots. Waves building to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots. A chance of showers, then
showers likely. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-080800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Tue Oct 7 2025

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing southwest
late. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight, then increasing to 10 to 20 knots late. Waves
building to 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots backing south by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Southeast winds 20 to 30 knots veering south. A chance
of showers. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-080800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Tue Oct 7 2025

.LATE THIS AFTERNOON...Northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight, then increasing to 10 to 20 knots late. Waves
calm to 2 feet.
.THURSDAY...Southwest winds 15 to 25 knots backing south by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.FRIDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 1 to 3 feet.
.SUNDAY...Southeast winds 15 to 25 knots becoming south 20 to
30 knots. A chance of showers, then showers likely. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ266-080800-
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 PM EDT Tue Oct 7 2025

.LATE THIS AFTERNOON...Northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. Waves 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. A slight chance of showers after midnight. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest in the
afternoon, then diminishing to 5 to 15 knots late. A slight
chance of showers through early afternoon. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots late. 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 after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots becoming northeast 5 to
15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.SUNDAY...Southeast winds 20 to 30 knots veering south. A chance
of showers. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-080800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Tue Oct 7 2025

.LATE THIS AFTERNOON...Northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. Waves 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...Northwest winds 20 to 30 knots veering north after
midnight, then diminishing to 15 to 25 knots late. Waves
subsiding to 3 to 5 feet occasionally to 7 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 after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots backing southeast
after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast. Waves
building to 1 to 3 feet.
.SUNDAY...Southeast winds 15 to 25 knots becoming south 20 to
30 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ261-080200-
MAFOR 0721/
Superior West 11720 11820 12810 11800 11700 12500. Waves 2 to 4
feet subsiding to 1 to 3 feet tonight. Waves 1 foot or less
Wednesday.

Superior North Central 11740 11830 12820 11810 11710 11700 11600.
Waves 4 to 7 feet subsiding to 2 to 4 feet tonight. Waves 1 to 3
feet subsiding to 1 foot or less Wednesday.

Superior South Central 11740 11730 11830 11820 12810 12700. Waves
4 to 7 feet subsiding to 3 to 6 feet tonight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Wednesday.

Superior East 12740 11830 13820 11810 11710. Waves 5 to 9 feet
subsiding to 3 to 6 feet tonight. Waves 2 to 4 feet subsiding to
1 to 2 feet Wednesday.

$$

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