408
FZUS63 KMQT 080201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EDT Mon Sep 7 2026

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 of 30.1 inches persists over Lake Superior into tonight as a
30.4 inch high crosses far northern Ontario. Meanwhile, a 29.5 inch
low developing tracks northeast to the Canadian Prairies before
approaching Hudson Bay and deepening to 29.1 inches by Wednesday
afternoon. This sends a 29.7 inch trough over the lake Tuesday night
and Wednesday. Ridging of 29.9 to 30.0 inches returns on Thursday,
followed by another trough of 29.6 to 29.7 inches on Friday.



LSZ162-080800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Mon Sep 7 2026 /900 PM CDT Mon Sep 7 2026/

...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY
AFTERNOON...

.REST OF TONIGHT...East winds 10 to 20 knots veering southeast
after midnight, then becoming south 15 to 25 knots late. A chance
of showers by midnight. A chance of thunderstorms. Showers after
midnight. Waves calm to 2 feet building to 2 to 4 feet.
.TUESDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots late. A chance of showers and a slight chance of
thunderstorms through early afternoon. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots late. Waves building to 3 to 5 feet occasionally
to 7 feet.
.WEDNESDAY...West gales to 35 knots. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...Southwest winds 20 to 30 knots veering west. A chance
of showers and thunderstorms. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...West 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 calm to 2 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-
1000 PM EDT Mon Sep 7 2026

...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY
EVENING...

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then increasing to 20 to 30 knots late. Showers
and a slight chance of thunderstorms after midnight. Waves calm
to 2 feet building to 2 to 4 feet.
.TUESDAY...South winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 15 to 25 knots late. Showers and
a chance of thunderstorms through early afternoon, then a slight
chance of showers by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots veering west
late. A slight chance of showers through midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 45 knots. Waves building to 7 to
11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...West gales to 40 knots becoming northwest
20 to 30 knots after midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing southwest by
mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southwest gales to 40 knots diminishing to 20 to
30 knots. A chance of showers and thunderstorms. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.SATURDAY...West gales to 35 knots diminishing to 20 to 30 knots.
Waves building to 3 to 6 feet occasionally to 8 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-
1000 PM EDT Mon Sep 7 2026

...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY
EVENING...

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers after midnight. Waves 1 to
3 feet building to 2 to 4 feet.
.TUESDAY...South winds 20 to 30 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible in the afternoon,
then diminishing to 20 to 30 knots late. Showers and a slight
chance of thunderstorms through early afternoon, then a slight
chance of showers by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 45 knots. Waves building to 8 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 40 knots diminishing to
20 to 30 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots by mid afternoon. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West gales to 35 knots. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-080800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EDT Mon Sep 7 2026

...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH LATE
WEDNESDAY NIGHT...

.REST OF TONIGHT...Southeast winds 20 to 30 knots becoming south
15 to 25 knots after midnight. A chance of showers after
midnight. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TUESDAY...South winds to 30 knots with a few gale force gusts to
35 knots possible. Showers through early afternoon. A chance of
thunderstorms. A chance of showers by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight, then becoming west 15 to 25 knots late. A slight
chance of showers through midnight. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.WEDNESDAY...West gales to 45 knots. Waves building to 7 to
10 feet occasionally to 13 feet.
.WEDNESDAY NIGHT...West gales to 40 knots becoming northwest
gales to 35 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 20 to 30 knots veering southwest. Showers
likely. Waves building to 2 to 4 feet.
.SATURDAY...West gales to 35 knots diminishing to 20 to 30 knots.
Waves building to 3 to 6 feet occasionally to 8 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-
1000 PM EDT Mon Sep 7 2026

...GALE WARNING IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY
EVENING...
...GALE WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH LATE
WEDNESDAY NIGHT...

.REST OF TONIGHT...South winds 15 to 25 knots. A slight chance of
showers after midnight. Waves 1 to 3 feet building to 2 to
4 feet.
.TUESDAY...South winds 20 to 30 knots increasing to gales to
40 knots in the afternoon. Showers through early afternoon. A
slight chance of thunderstorms. A chance of showers by mid
afternoon. Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...South gales to 35 knots diminishing to 20 to
30 knots after midnight, then becoming southwest 15 to 25 knots
late. A slight chance of thunderstorms through midnight. A slight
chance of showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 9 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...West gales to 40 knots becoming northwest
gales to 35 knots after midnight. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.FRIDAY...South gales to 35 knots veering southwest. A chance of
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 20 to 30 knots. Waves subsiding to 3 to
5 feet occasionally to 7 feet.

$$

LSZ267-080800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EDT Mon Sep 7 2026

...GALE WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH LATE
WEDNESDAY NIGHT...

.REST OF TONIGHT...South winds 10 to 20 knots backing southeast
after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of showers through early afternoon, then
showers likely and a slight chance of thunderstorms by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...South winds 20 to 30 knots veering southwest
late. A chance of showers and a slight chance of thunderstorms.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 15 to 25 knots increasing to gales to
40 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves building to 9 to 12 feet occasionally to
15 feet.
.WEDNESDAY NIGHT...West gales to 40 knots becoming northwest
gales to 35 knots after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots increasing to 20 to
30 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ261-080800-
MAFOR 0803/
Superior West 11320 11426 12436 11430 11420 11520 11530. A chance
of thunderstorms overnight and Tuesday morning. Waves 1 to 2 feet
overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet Tuesday.
Waves 1 to 3 feet Tuesday evening.

Superior North Central 11320 11420 11430 11446 12450 11440 11430.
Waves 1 to 3 feet building to 2 to 4 feet overnight. Waves 2 to 4
feet building to 5 to 8 feet Tuesday. Waves 4 to 7 feet subsiding
to 3 to 5 feet Tuesday evening.

Superior South Central...GALE WARNING IN EFFECT...13430 11446
11456 12450 11440. Waves 1 to 3 feet overnight. Waves 1 to 3 feet
building to 4 to 7 feet Tuesday. Waves 3 to 6 feet Tuesday
evening.

Superior East...GALE WARNING IN EFFECT...12310 11320 11420 11436
11446 12440. Waves 1 to 2 feet overnight. Waves 2 to 4 feet
building to 4 to 6 feet Tuesday. Waves 4 to 6 feet Tuesday
evening.

$$

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