219
FZUS63 KMQT 070802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 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 the lake builds to 30.2 inches today as
a 30.4 inch high pressure 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 29.2 inches by
Wednesday afternoon. This sends a 29.6 to 29.7 inch trough over Lake
Superior Tuesday night and Wednesday. Weak ridging of 29.9 inches
returns over the lake on Thursday, followed by another trough
ranging from 29.5 to 29.7 inches on Friday.



LSZ162-072000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Mon Sep 7 2026 /301 AM CDT Mon Sep 7 2026/

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.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-
401 AM EDT Mon Sep 7 2026

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing east in the afternoon.
A slight chance of showers through early afternoon. 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-
401 AM EDT Mon Sep 7 2026

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots veering southeast in the
afternoon, then 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-
401 AM EDT Mon Sep 7 2026

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

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 15 to 25 knots late. Waves 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-
401 AM EDT Mon Sep 7 2026

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

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.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-
401 AM EDT Mon Sep 7 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.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.

$$

LSZ261-071400-
MAFOR 0709/
Superior West 11200 12300 11210 12220 11320 11426. Waves 1 foot
or less today. Waves 1 to 3 feet tonight.

Superior North Central 11200 11300 12310 11320 13330. Waves 1
foot or less today. Waves 1 to 3 feet building to 2 to 4 feet
tonight.

Superior South Central 13410 11320 13330 11430. Waves 2 feet or
less today. Waves 2 to 4 feet tonight.

Superior East 11400 11410 11400 11300 11210 12310 11320. Waves 2
feet or less.

$$

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