933
FZUS63 KMQT 062001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sun Sep 6 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 through tonight
and then briefly builds to 30.2 inches on Monday as 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.



LSZ162-070800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sun Sep 6 2026 /301 PM CDT Sun Sep 6 2026/

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
late. A slight chance of showers. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 15 to 25 knots veering southeast after
midnight, then becoming south 20 to 30 knots late. A chance of
showers through midnight, then showers and a slight chance of
thunderstorms after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.TUESDAY...South winds 20 to 30 knots. Showers likely and a
slight chance of thunderstorms through early afternoon. Waves
subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots. Waves building
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 40 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...Southwest winds 10 to 20 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ263-070800-
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 Sun Sep 6 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. A slight chance of showers through early afternoon. Waves
building to 1 to 3 feet.
.MONDAY NIGHT...East winds 10 to 20 knots becoming southeast
20 to 30 knots after midnight, then becoming south to 30 knots
with a few gale force gusts to 35 knots possible late. A chance
of showers through midnight, then showers and a slight chance of
thunderstorms after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...South gales to 35 knots. 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 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 5 to 8 feet
occasionally to 10 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 southwest 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.FRIDAY...Southwest gales to 35 knots becoming west 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.

$$

LSZ264-070800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sun Sep 6 2026

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. A slight chance of showers. Waves building to 2 to 4 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots increasing to
20 to 30 knots. A slight chance of showers through midnight, then
showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...South winds 20 to 30 knots. 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 winds 20 to 30 knots becoming southwest
gales to 35 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 5 to 8 feet occasionally
to 10 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 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. A chance of showers. Waves building to 2 to 4 feet.

$$

LSZ265-070800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sun Sep 6 2026

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

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...East winds 10 to 20 knots veering south late. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 15 to 25 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight, then increasing to 20 to 30 knots
late. Showers likely after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.TUESDAY...South gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Showers through early afternoon. A slight
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. Waves subsiding to 2 to 4 feet, then building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 45 knots. Waves building to 6 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 15 to 25 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 20 to 30 knots veering southwest. Waves
building to 2 to 4 feet.

$$

LSZ266-070800-
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 Sun Sep 6 2026

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

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots in the afternoon, then becoming east 10 to 20 knots
late. A slight chance of showers through early afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots increasing to
20 to 30 knots late. A chance of showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...South gales to 35 knots. Showers and a slight chance
of thunderstorms. Waves building to 4 to 8 feet occasionally to
10 feet.
.TUESDAY NIGHT...South gales to 35 knots becoming southwest 20 to
30 knots after midnight. A chance of showers. Waves subsiding to
3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet
occasionally to 9 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 5 to 8 feet
occasionally to 10 feet.
.THURSDAY...Northwest winds 20 to 30 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest gales to
35 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-070800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sun Sep 6 2026

.LATE THIS AFTERNOON...Northeast winds less than 10 knots. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south late. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east late. A slight
chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots increasing to 15 to
25 knots. A chance of showers after midnight. Waves building to
1 to 3 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering south by mid
afternoon. A chance of showers through early afternoon, then
showers 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
after midnight. Showers likely through midnight. A chance of
showers after midnight. Waves 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Southwest gales to 35 knots becoming west gales to
40 knots by mid afternoon. A chance of showers. 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.
.FRIDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ261-070200-
MAFOR 0621/
Superior West 11100 11200 12100 13200 11210. Waves 1 foot or
less.

Superior North Central 14300 11200 13210. Waves 1 foot or less
tonight. Waves 1 to 3 feet Monday.

Superior South Central 12210 11310 13410 11310 11320. Waves 1
foot or less.

Superior East 12200 11300 13400 11300 11200. Waves 1 foot or
less.

$$

WFO MQT

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weather.gov/mqt/glftable

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weather.gov/greatlakes