349
FZUS63 KMQT 150901
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EST Sat Nov 15 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 29.4 inch trough extends over Lake Superior this morning from a
29.2 inch low moving towards Hudson Bay. The trough exits into
eastern Ontario this evening and develops into a 29.1 inch low over
New England by Sunday morning, further deepening to 28.8 inches over
the Canadian Maritimes Sunday night into Monday. Troughing gradually
weakens to 29.9 inches over Lake Superior through Sunday night as
this occurs. Meanwhile, 30.1 inch high pressure extending from
Saskatchewan to the Dakotas this weekend builds to 30.3 inches as it
shifts east to the Great Lakes by Tuesday night. High pressure
persists at around 30.2 inches over the lake through late next week
as the high shifts east to New England by Thursday night.


LSZ162-152100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EST Sat Nov 15 2025 /301 AM CST Sat Nov 15 2025/

.EARLY THIS MORNING...West winds 10 to 20 knots. A slight chance
of showers. Waves calm to 2 feet.
.TODAY...West winds 15 to 25 knots increasing to 20 to 30 knots
by late morning, then veering northwest by mid afternoon. A
slight chance of rain showers in the morning. Waves building to
3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 20 to 30 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.WEDNESDAY...South winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ263-152100-
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 EST Sat Nov 15 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. A chance of
showers. Waves 1 to 3 feet.
.TODAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers in the
morning. Waves building to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Northwest winds 20 to 30 knots. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-152100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EST Sat Nov 15 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. A slight chance
of showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers in the morning. Waves building
to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Northwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots by
midnight. Waves building to 6 to 10 feet occasionally to 13 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves subsiding to 5 to
8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-152100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EST Sat Nov 15 2025

...GALE WARNING IN EFFECT FROM 4 PM EST THIS AFTERNOON THROUGH
SUNDAY MORNING...

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. A slight
chance of showers. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TODAY...West winds 15 to 25 knots becoming northwest gales to
40 knots. A chance of rain showers in the morning. Waves building
to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Northwest gales to 40 knots. A slight chance of snow
showers after midnight. Waves building to 6 to 10 feet
occasionally to 13 feet.
.SUNDAY...Northwest gales to 40 knots. A slight chance of snow
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. A slight chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...Northwest winds 15 to 25 knots. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ266-152100-
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 EST Sat Nov 15 2025

...GALE WARNING IN EFFECT FROM 2 PM EST THIS AFTERNOON THROUGH
SUNDAY EVENING...

.EARLY THIS MORNING...South winds 15 to 25 knots. A slight chance
of showers. Waves 4 to 7 feet occasionally to 9 feet subsiding to
3 to 6 feet occasionally to 8 feet.
.TODAY...West winds 15 to 25 knots becoming northwest gales to
40 knots. A chance of rain showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet, then building to 9 to 12 feet
occasionally to 15 feet.
.TONIGHT...Northwest gales to 40 knots. A slight chance of rain
showers in the evening. A chance of snow showers. Waves building
to 10 to 14 feet occasionally to 18 feet.
.SUNDAY...Northwest gales to 40 knots. A chance of snow showers.
Waves 10 to 14 feet occasionally to 18 feet.
.SUNDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of snow showers. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Northwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots veering southwest. A
chance of rain showers. Waves calm to 2 feet.

$$

LSZ267-152100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EST Sat Nov 15 2025

...GALE WARNING IN EFFECT FROM 2 PM EST THIS AFTERNOON THROUGH
SUNDAY EVENING...

.EARLY THIS MORNING...South winds 20 to 30 knots. A slight chance
of showers. Waves 4 to 8 feet occasionally to 10 feet.
.TODAY...South winds 15 to 25 knots becoming northwest gales to
40 knots. A chance of rain showers. Waves subsiding to 2 to
4 feet, then building to 9 to 12 feet occasionally to 15 feet.
.TONIGHT...Northwest gales to 40 knots. A chance of rain showers,
possibly mixed with snow in the evening, then snow showers likely
after midnight. Waves building to 10 to 14 feet occasionally to
18 feet.
.SUNDAY...Northwest gales to 40 knots. Snow showers. Waves 10 to
14 feet occasionally to 18 feet.
.SUNDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow showers likely in the evening, then
a chance of snow showers after midnight. Waves subsiding to 5 to
8 feet occasionally to 10 feet.
.MONDAY...Northwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. A chance of snow showers in the evening. Waves
subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west. Waves calm
to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.

$$

LSZ261-151500-
MAFOR 1510/
Superior West 11620 11720 11730 14740 11730. A chance of showers
this morning. Waves 1 to 3 feet building to 3 to 6 feet today.
Waves 4 to 7 feet subsiding to 3 to 6 feet tonight.

Superior North Central 11620 13740 12750 12740. A chance of
showers this morning. Waves 3 to 6 feet building to 5 to 7 feet
today. Waves 6 to 10 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...11520 11640
11740 14750 11750. A chance of showers this morning. Waves 2 to 4
feet subsiding to 1 to 3 feet, then building to 5 to 9 feet
today. Waves 7 to 11 feet tonight.

Superior East...GALE WARNING IN EFFECT...11430 11530 11740 14750
11757. A chance of showers this morning. A chance of rain showers
this evening. Waves 5 to 8 feet subsiding to 3 to 5 feet, then
building to 9 to 12 feet today. Waves 9 to 13 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