594
FZUS63 KMQT 060801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Mon Oct 6 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 near James Bay will pull a 29.8 inch troughing over
Lake Superior into early this morning. In its wake, a 30.2 inch high
pressure moving across the Northern Plains builds 30.1 inch ridging
back over Lake Superior through early Tuesday when a 30.0 inch
trough moves through the lake. Ridging returns Tuesday and
strengthens to 30.4 inches over the lake by Wednesday as reinforcing
high pressure moves overhead from the Canadian Prairies. The high
shifts east to New England by Thursday night at 30.5 inches,
allowing 30.0 inch troughing to return to the lake as a 29.4 inch
low moves over Hudson Bay.


LSZ162-062000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Mon Oct 6 2025 /301 AM CDT Mon Oct 6 2025/

...GALE WARNING IN EFFECT UNTIL 5 AM EDT /4 AM CDT/ EARLY THIS
MORNING...

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 1 to 3 feet.
.TODAY...Northwest winds 10 to 20 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 15 to 25 knots
after midnight. Waves building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.FRIDAY...West winds 10 to 20 knots becoming south 5 to 15 knots.
Waves subsiding to calm to 2 feet.

$$

LSZ263-062000-
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 Mon Oct 6 2025

...GALE WARNING IN EFFECT UNTIL 5 AM EDT EARLY THIS MORNING...

.EARLY THIS MORNING...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.
.TODAY...Northwest winds 10 to 20 knots backing southwest late.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west after
midnight, then increasing to 20 to 30 knots late. Waves building
to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.FRIDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-062000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Mon Oct 6 2025

.EARLY THIS MORNING...Northwest winds 20 to 30 knots. Waves 4 to
8 feet occasionally to 10 feet.
.TODAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing southwest late. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots veering northwest in the
afternoon, then diminishing to 15 to 25 knots late. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...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 by
mid 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 2 to 4 feet.
.THURSDAY...Southwest winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.FRIDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-062000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Mon Oct 6 2025

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

$$

LSZ266-062000-
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 Mon Oct 6 2025

.EARLY THIS MORNING...Northwest winds 20 to 30 knots. A chance of
showers. Waves 5 to 8 feet occasionally to 10 feet.
.TODAY...Northwest winds 20 to 30 knots diminishing to 5 to
15 knots. Waves subsiding to 2 to 4 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
A slight chance of showers through midnight. Waves subsiding to
1 to 3 feet, then building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots in the afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest by mid
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 15 to 25 knots veering southwest. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...West winds 10 to 20 knots. A chance of showers. Waves
subsiding to calm to 2 feet.

$$

LSZ267-062000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Mon Oct 6 2025

.EARLY THIS MORNING...West winds 20 to 30 knots. Showers. Waves
3 to 6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet.
.TODAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of showers through early afternoon. Waves
subsiding to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots. A slight chance of showers
through midnight. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then veering northwest late. Waves building to
6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid 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 calm to 2 feet.
.THURSDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-061400-
MAFOR 0609/
Superior West 11730 11720 11610 11510 12520 12630. Waves 3 to 5
feet subsiding to 1 to 3 feet today. Waves 1 to 3 feet building
to 2 to 4 feet tonight.

Superior North Central 11740 11730 11720 11620 12520 12630. Waves
5 to 8 feet subsiding to 1 to 3 feet today. Waves 1 to 3 feet
building to 3 to 5 feet tonight.

Superior South Central 11740 11730 12720 11710 11510 11520 11630.
Waves 3 to 6 feet subsiding to 2 to 4 feet today. Waves 1 to 3
feet tonight.

Superior East 11746 12730 11720 11710 12610 11620. Waves 5 to 7
feet subsiding to 3 to 5 feet today. Waves 2 to 4 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