134
FZUS63 KMQT 082001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Tue Sep 8 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...

This afternoon, a 29.4 inch low currently over the Canadian Prairies
swings northeast toward northern Quebec, deepening to 29.1 by the
time it reaches Hudson Bay Wednesday afternoon. This sends a 29.8
inch trough over Lake Superior and drives gusty surface southerly
flow on Lake Superior through Tuesday evening, at which point winds
shift west with frontal passage. Strong postfrontal westerlies
persist until Thursday morning; widespread gale-force winds are
anticipated. Ridging to 30.0 inches and subsequent calmer conditions
follow until Friday morning, when a trough of 29.3 inches tracks
from the Great Plains north toward Hudson Bay. Friday through
Saturday morning, a tight pressure gradient between 29.6 and 29.9
inches sits over Lake Superior as the Plains shifts rapidly north,
tracking through Minnesota. Expect breezy southerly flow Friday
afternoon through Saturday morning as a result of this low`s
passage, and strong westerlies throughout the day on Saturday.
Ridging begins to build back in Saturday, reaching 29.9 inches by
Sunday morning.



LSZ162-090800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Tue Sep 8 2026 /301 PM CDT Tue Sep 8 2026/

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

.LATE THIS AFTERNOON...South winds 15 to 25 knots. A slight
chance of showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...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 winds 20 to 30 knots increasing to gales to
35 knots in the afternoon, then diminishing to 20 to 30 knots
late. Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...Southwest winds 20 to 30 knots backing south by mid
afternoon. A chance of showers by mid afternoon. Waves building
to 2 to 4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Showers and a chance of thunderstorms. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 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.
.SUNDAY...West winds 10 to 20 knots becoming north 5 to 15 knots.
Waves building to 1 to 3 feet.

$$

LSZ263-090800-
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 Tue Sep 8 2026

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

.LATE THIS AFTERNOON...South winds 15 to 25 knots. A slight
chance of showers and thunderstorms. Waves 2 to 4 feet.
.TONIGHT...South winds 20 to 30 knots veering west late. Waves
building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 15 to
25 knots after midnight, then becoming northwest 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 5 to 15 knots becoming southwest
10 to 20 knots 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...South gales to 40 knots. A chance of showers by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...South gales to 35 knots veering southwest after
midnight. Showers and a chance of thunderstorms. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West gales to 35 knots. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ264-090800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Tue Sep 8 2026

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

.LATE THIS AFTERNOON...South winds 15 to 25 knots. A slight
chance of showers and thunderstorms. Waves 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...South winds 20 to 30 knots veering west late. A slight
chance of showers through midnight. Waves subsiding to 3 to
5 feet occasionally to 7 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 8 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...West gales to 35 knots becoming northwest
20 to 30 knots after midnight, then diminishing to 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southwest 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. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...West gales to 35 knots. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-090800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Tue Sep 8 2026

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

.LATE THIS AFTERNOON...South winds 20 to 30 knots. A slight
chance of showers and thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...South winds 20 to 30 knots veering west late. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 6 to
10 feet occasionally to 13 feet.
.WEDNESDAY NIGHT...West gales to 35 knots becoming northwest
20 to 30 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 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. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South gales to 35 knots. A chance of showers
through midnight, then showers after midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...West gales to 40 knots diminishing to 20 to 30 knots.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ266-090800-
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 Tue Sep 8 2026

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...GALE WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH
WEDNESDAY EVENING...

.LATE THIS AFTERNOON...South gales to 35 knots. A chance of
showers and a slight chance of thunderstorms. Waves 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...South gales to 35 knots diminishing to 20 to 30 knots
after midnight, then veering southwest late. A slight chance of
showers and thunderstorms through midnight. Waves building to
5 to 8 feet occasionally to 10 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 8 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots diminishing to
15 to 25 knots. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.THURSDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 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 winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...South gales to 40 knots. A chance of showers
through midnight, then showers likely after midnight. Waves
building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...West gales to 40 knots diminishing to 20 to 30 knots.
A chance of showers. Waves subsiding to 3 to 5 feet occasionally
to 7 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ267-090800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Tue Sep 8 2026

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

.LATE THIS AFTERNOON...South winds 20 to 30 knots. A chance of
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 20 to 30 knots becoming southwest 15 to
25 knots late. A chance of showers and thunderstorms. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 15 to 25 knots increasing to gales to
40 knots in the afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY NIGHT...West gales to 35 knots veering northwest after
midnight, then diminishing to 20 to 30 knots late. Waves
subsiding to 6 to 9 feet occasionally to 11 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 becoming south 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots increasing to gales to
35 knots after midnight. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet.
.SATURDAY...West winds 20 to 30 knots. Showers likely. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ261-090200-
MAFOR 0821/
Superior West...GALE WARNING IN EFFECT...11430 12540 13640 12650.
Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 6
feet building to 5 to 8 feet Wednesday.

Superior North Central...GALE WARNING IN EFFECT...12430 12540
11640 11650 12660. Waves 4 to 7 feet subsiding to 3 to 6 feet
tonight. Waves 5 to 8 feet building to 9 to 12 feet Wednesday.

Superior South Central...GALE WARNING IN EFFECT...11450 12440
11530 11640 12650 11660. Waves 4 to 7 feet subsiding to 2 to 4
feet tonight. Waves 3 to 5 feet building to 7 to 11 feet
Wednesday.

Superior East...GALE WARNING IN EFFECT...13440 11540 11530 11630
12640. A chance of showers tonight. Waves 4 to 7 feet tonight.
Waves 3 to 6 feet building to 9 to 12 feet Wednesday.

$$

WFO MQT

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weather.gov/mqt/glftable

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weather.gov/greatlakes