042
FZUS63 KMQT 071401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM 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 over Lake Superior builds to 30.2 inches
today as a 30.4 inch high crosses far northern Ontario. Meanwhile, a
29.6 inch low develops off the northern Rockies by Monday morning
and then tracks northeast to Hudson Bay, deepening to 29.1 inches by
Wednesday afternoon. This sends a 29.7 inch trough over the lake
Tuesday night and Wednesday. Ridging of 30.0 inches returns on
Thursday, followed by another trough of around 29.7 inches on Friday.



LSZ162-072000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Mon Sep 7 2026 /901 AM CDT Mon Sep 7 2026/

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

$$

LSZ263-072000-
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-
1001 AM EDT Mon Sep 7 2026

.REST OF TODAY...South winds 5 to 15 knots backing east in the
afternoon. A slight chance of showers by late morning. Waves calm
to 2 feet.
.TONIGHT...East winds 10 to 20 knots becoming south 15 to
25 knots after midnight, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. A chance of showers.
A slight chance of thunderstorms after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...South winds to 30 knots with a few gale force gusts to
35 knots possible becoming southwest 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 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to
5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 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...West winds 10 to 20 knots becoming south 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.
.FRIDAY...Southwest gales to 35 knots becoming west 20 to
30 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-072000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Mon Sep 7 2026

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

$$

LSZ265-072000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Mon Sep 7 2026

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

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

$$

LSZ266-072000-
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-
1001 AM EDT Mon Sep 7 2026

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

.REST OF TODAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming southeast 15 to 25 knots
late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 15 to 25 knots veering south after
midnight, then increasing to 20 to 30 knots late. A slight chance
of showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...South gales to 35 knots. Showers likely through early
afternoon. A slight chance of thunderstorms. A 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 20 to 30 knots becoming southwest
15 to 25 knots after midnight. A slight chance of thunderstorms
through midnight. A chance of showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 45 knots. Waves building to 9 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...West gales to 45 knots becoming northwest
gales to 35 knots after midnight. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.THURSDAY...Northwest winds 15 to 25 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest gales to
35 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ267-072000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Mon Sep 7 2026

.REST OF TODAY...South winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY...South winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of showers. 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
after midnight. Showers likely and a slight chance of
thunderstorms through midnight, then a chance of showers after
midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming west gales
to 40 knots by mid afternoon. Waves building to 10 to 14 feet
occasionally to 18 feet.
.WEDNESDAY NIGHT...West gales to 40 knots becoming northwest
gales to 35 knots after midnight. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-072000-
MAFOR 0715/
Superior West 11300 11210 12220 11320 11426 12436. Waves 1 foot
or less this afternoon. Waves 1 to 3 feet tonight and Tuesday
morning.

Superior North Central 12310 11320 13330 11440 11446. Waves 1
foot or less this afternoon. Waves 1 to 3 feet building to 2 to 4
feet tonight. Waves 3 to 6 feet Tuesday morning.

Superior South Central 11410 11320 13330 11430 11440 11446. Waves
2 feet or less this afternoon. Waves 2 to 4 feet tonight. Waves 2
to 4 feet building to 3 to 5 feet Tuesday morning.

Superior East 11400 11300 11210 12310 12320 11430. A chance of
showers Tuesday morning. Waves 1 to 3 feet this afternoon and
tonight. Waves 2 to 4 feet Tuesday morning.

$$

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