742
FZUS63 KMQT 112001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM 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 over Lake Superior this afternoon lifts northeast
away from the lake this evening as the parent high builds to 30.4
inches over Quebec. Ridging over Lake Superior weakens further on
Sunday as the next system organizes upstream over the Northern
Plains at 29.2 inches. Sunday night through Monday, this low weakens
to 29.5 inches as it lifts northeast from southern Manitoba to
Hudson Bay, extending a 29.8 inch trough over western Lake Superior
late in the day Sunday into Monday. A 30.4 inch high builds in over
the Canadian Prairies Monday night into Tuesday, shifting east to
the Great Lakes and northern Ontario by Wednesday at 30.3 inches.
Ridging gradually weakens to 30.1 inches over Lake Superior through
Thursday as troughing develops over the Plains and the high shifts
northeast.


LSZ162-120800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sat Oct 11 2025 /301 PM CDT Sat Oct 11 2025/

.LATE THIS AFTERNOON...East winds 10 to 20 knots. 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, then increasing to 20 to 30 knots late. A slight
chance of showers. Waves subsiding to 2 to 4 feet, then building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots veering southwest
late. Showers. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY...West winds 15 to 25 knots. A slight chance of showers
through early afternoon. 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 backing west by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots becoming southeast 15 to
25 knots. A chance of showers, then showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-120800-
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 Sat Oct 11 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 15 to 25 knots becoming southeast 20 to
30 knots late. A slight chance of showers. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible after midnight.
A chance of showers through midnight, then showers after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.THURSDAY...East winds 10 to 20 knots becoming southeast 20 to
30 knots. A chance of showers, then showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ264-120800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sat Oct 11 2025

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

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then increasing to 15 to 25 knots late. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then becoming southeast gales to 35 knots late.
A slight chance of showers by mid afternoon. Waves building to
6 to 9 feet occasionally to 11 feet.
.SUNDAY NIGHT...South gales to 40 knots diminishing to 20 to
30 knots late. A slight chance of showers through midnight, then
showers after midnight. Waves building to 8 to 11 feet
occasionally to 14 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 4 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots becoming southeast 20 to
30 knots. A chance of showers, then showers likely. Waves
building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ265-120800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sat Oct 11 2025

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

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots in the afternoon, then backing southeast late. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...South gales to 40 knots diminishing to 20 to
30 knots late. 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, then a slight
chance of showers by mid afternoon. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots becoming southeast 20 to
30 knots. A chance of showers, then showers likely. Waves
building to 2 to 4 feet.

$$

LSZ266-120800-
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 Sat Oct 11 2025

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

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering south late. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots increasing to gales to
35 knots. 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 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 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north. Waves
subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots becoming southeast 20 to
30 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ267-120800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sat Oct 11 2025

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 1 to 3 feet.
.SUNDAY...Southeast winds 15 to 25 knots veering south in the
afternoon, then becoming southeast 20 to 30 knots late. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots increasing to
30 knots with a few gale force gusts to 35 knots possible after
midnight, then becoming south 20 to 30 knots late. 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 west 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. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...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 veering north. Waves
subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming southeast 15 to
25 knots. Showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ261-120200-
MAFOR 1121/
Superior West 11210 12320 13430 11320 11330. Waves 1 to 3 feet
building to 2 to 4 feet tonight. Waves 2 to 4 feet Sunday.

Superior North Central 11310 11320 11330 13430 11440 11350. Waves
1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 6 feet
building to 5 to 8 feet Sunday.

Superior South Central 11210 12320 13430 11440 11340. Waves 1 to
3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet
building to 3 to 5 feet Sunday.

Superior East 11200 11210 12320 11420 12430 11330. Waves 1 to 3
feet tonight. Waves 3 to 5 feet Sunday.

$$

WFO MQT

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weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes