098
FZUS63 KMQT 150801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Tue Sep 15 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...

A 29.3 inch low currently over Manitoba moves to southern Hudson Bay
at 29.4 inches by this afternoon, bringing 29.7 inch troughing
across Lake Superior. Meanwhile, 30.2 inch high pressure develops
over the Northern Plains this afternoon, strengthening to 30.4
inches as it crosses the Upper Great Lakes on Wednesday. High
pressure ridging of 30.2 to 30.3 inches then looks to remain over
Lake Superior through the rest of the workweek.



LSZ162-152000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Tue Sep 15 2026 /300 AM CDT Tue Sep 15 2026/

...GALE WARNING IN EFFECT FROM 8 AM EDT /7 AM CDT/ THIS MORNING
TO 4 PM EDT /3 PM CDT/ THIS AFTERNOON...

.EARLY THIS MORNING...Southwest winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Southwest gales to 40 knots veering west in the
afternoon, then diminishing to 20 to 30 knots late. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering northwest late. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering east in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots increasing to 20 to 30 knots.
A chance of showers. Waves building to 2 to 4 feet.
.SATURDAY...Northeast winds 20 to 30 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-152000-
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-
400 AM EDT Tue Sep 15 2026

...GALE WARNING IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH THIS
EVENING...

.EARLY THIS MORNING...Southwest winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TODAY...Southwest gales to 45 knots veering west in the
afternoon. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering northwest late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots becoming northeast less
than 10 knots in the afternoon, then becoming east 5 to 15 knots
late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of showers. Waves building to 2 to 4 feet.
.SATURDAY...East winds 20 to 30 knots backing northeast. A chance
of showers. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-152000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Tue Sep 15 2026

...GALE WARNING IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH THIS
EVENING...

.EARLY THIS MORNING...South winds 20 to 30 knots. Waves 6 to
10 feet occasionally to 13 feet.
.TODAY...Southwest gales to 45 knots veering west in the
afternoon. Waves subsiding to 5 to 8 feet occasionally to
10 feet, then building to 10 to 14 feet occasionally to 18 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 10 to
20 knots after midnight, then becoming northwest 5 to 15 knots
late. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming north less
than 10 knots in the afternoon, then veering southeast late.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots becoming southeast 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.SATURDAY...East winds 20 to 30 knots becoming northeast 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-152000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Tue Sep 15 2026

...GALE WARNING IN EFFECT THROUGH THIS EVENING...

.EARLY THIS MORNING...South gales to 40 knots. Waves 4 to 8 feet
occasionally to 10 feet.
.TODAY...Southwest gales to 35 knots becoming west gales to
40 knots in the afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then becoming northwest 10 to 20 knots
late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north in the
afternoon, then veering east late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots becoming southeast 20 to
30 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Southeast gales to 40 knots becoming northeast 20 to
30 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ266-152000-
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-
400 AM EDT Tue Sep 15 2026

...GALE WARNING IN EFFECT THROUGH THIS EVENING...

.EARLY THIS MORNING...South gales to 40 knots. A slight chance of
showers. Waves 8 to 11 feet occasionally to 14 feet.
.TODAY...South gales to 35 knots becoming west gales to 40 knots
in the afternoon. Waves subsiding to 5 to 8 feet occasionally to
10 feet, then building to 10 to 14 feet occasionally to 18 feet.
.TONIGHT...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.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming north less
than 10 knots in the afternoon, then becoming east 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of showers through midnight.
Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots becoming southeast 20 to
30 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Southeast gales to 40 knots becoming northeast 20 to
30 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-152000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Tue Sep 15 2026

...GALE WARNING IN EFFECT UNTIL 9 AM EDT THIS MORNING...

.EARLY THIS MORNING...South gales to 40 knots. A chance of
showers. Waves 6 to 9 feet occasionally to 11 feet.
.TODAY...South gales to 35 knots becoming southwest 20 to
30 knots in the afternoon, then becoming west gales to 35 knots
late. A slight chance of showers through early afternoon. Waves
subsiding to 4 to 7 feet occasionally to 9 feet, then building to
7 to 10 feet occasionally to 13 feet.
.TONIGHT...West gales to 35 knots becoming northwest 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north late.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming northwest
10 to 20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots veering
northeast after midnight. Waves building to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots becoming southeast 15 to
25 knots. A chance of showers. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.SATURDAY...Southeast winds 20 to 30 knots backing northeast. A
chance of showers. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.

$$

LSZ261-151400-
MAFOR 1509/
Superior West...GALE WARNING IN EFFECT...11540 11550 11660 11650
11640 11620 11610 11710. Waves 3 to 6 feet building to 7 to 11
feet today. Waves 4 to 7 feet subsiding to 1 to 3 feet tonight.

Superior North Central...GALE WARNING IN EFFECT...11440 11550
11560 11660 11650 11640 11630 11720. Waves 6 to 9 feet building
to 10 to 14 feet today. Waves 10 to 13 feet subsiding to 3 to 6
feet tonight.

Superior South Central...GALE WARNING IN EFFECT...12450 11550
11660 12650 11630 11730. Waves 6 to 9 feet subsiding to 4 to 7
feet, then building to 6 to 10 feet today. Waves 7 to 10 feet
subsiding to 2 to 4 feet tonight.

Superior East...GALE WARNING IN EFFECT...12450 11540 12650 11640
11630 11720. A chance of showers early this morning. Waves 6 to
10 feet subsiding to 5 to 8 feet, then building to 7 to 10 feet
today. Waves 7 to 11 feet subsiding to 5 to 8 feet tonight.

$$

WFO MQT

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weather.gov/mqt/glftable

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weather.gov/greatlakes