913
FZUS63 KMQT 102001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Fri Oct 10 2025

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...

29.9 inch low pressure analyzed over northern Lake Superior this
afternoon slowly moves east-southeast towards Georgian Bay tonight
into Saturday morning while 30.2 inch ridging builds over Lake
Superior. This ridge gradually weakens through the weekend as the
next system organizes upstream in the Northern Plains. By early
Monday, a weakening 29.4 inch low pressure moves from Manitoba into
northern Ontario, causing a 29.8 to 29.9 inch trough to move over
Lake Superior before ridging returns late Monday into Tuesday,
building to 30.4 inches by Tuesday morning. The ridge remains in
place through midweek while slowly weakening.


LSZ162-110800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Fri Oct 10 2025 /301 PM CDT Fri Oct 10 2025/

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 2 to
4 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast in the
afternoon, then becoming east 10 to 20 knots late. Waves calm to
2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight, then veering south late. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots backing southeast by mid
afternoon. A slight chance of showers by mid afternoon. Waves
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots. Showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
by mid afternoon. A chance of showers through early afternoon.
Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots becoming west 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ263-110800-
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 Fri Oct 10 2025

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming northeast 5 to 15 knots
late. Waves subsiding to 1 to 3 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast in the
afternoon, then backing east late. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 15 to 25 knots becoming southeast 20 to
30 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots. A chance of showers
through midnight, then showers likely after midnight. Waves
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
4 to 7 feet occasionally to 9 feet.
.MONDAY...Southwest gales to 35 knots veering west by mid
afternoon. A chance of showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ264-110800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Fri Oct 10 2025

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...North gales to 35 knots. Waves 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then becoming northeast 5 to 15 knots
late. Waves subsiding to 2 to 4 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast in the
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots becoming southeast gales to
35 knots by mid afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY NIGHT...South gales to 35 knots. Showers likely after
midnight. Waves building to 6 to 10 feet occasionally to 13 feet.
.MONDAY...South winds 20 to 30 knots veering west by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming west 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ265-110800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Fri Oct 10 2025

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 40 knots. A slight
chance of showers. Waves 4 to 8 feet occasionally to 10 feet.
.TONIGHT...North gales to 35 knots diminishing to 10 to 20 knots.
A slight chance of showers through midnight. Waves building to
6 to 9 feet occasionally to 11 feet, then subsiding to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...South winds 20 to 30 knots becoming southeast gales to
35 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...South gales to 35 knots. A chance of showers
after midnight. Waves 3 to 5 feet occasionally to 7 feet.
.MONDAY...South winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. Showers likely through early afternoon, then a
chance of showers by mid afternoon. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves building to
1 to 3 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west. Waves
calm to 2 feet.

$$

LSZ266-110800-
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 Fri Oct 10 2025

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 40 knots. A chance of
showers. Waves 6 to 9 feet occasionally to 11 feet building to
7 to 10 feet occasionally to 13 feet.
.TONIGHT...North gales to 35 knots diminishing to 10 to 20 knots.
A slight chance of showers through midnight. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots becoming southeast gales to
35 knots by mid afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY NIGHT...South gales to 35 knots. A chance of showers
after midnight. Waves 6 to 9 feet occasionally to 11 feet.
.MONDAY...South winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. Showers likely. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves 1 to 3 feet.

$$

LSZ267-110800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Fri Oct 10 2025

.LATE THIS AFTERNOON...Northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. A chance of showers and a
slight chance of thunderstorms. Waves 5 to 9 feet occasionally to
11 feet.
.TONIGHT...North winds 20 to 30 knots becoming northeast 15 to
25 knots late. A slight chance of showers through midnight. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northeast winds 15 to 25 knots becoming east 5 to
15 knots in the afternoon, then backing northeast late. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots increasing to
15 to 25 knots. Waves building to 2 to 4 feet.
.SUNDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.MONDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon, then showers likely by mid afternoon. Waves subsiding
to 2 to 4 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots. Waves 1 to 3 feet.

$$

LSZ261-110200-
MAFOR 1021/
Superior West 11720 11710 11810 11110 11100 11200 12300. Waves 2
to 4 feet subsiding to 1 to 3 feet tonight. Waves 1 to 2 feet
Saturday.

Superior North Central...GALE WARNING IN EFFECT...11850 11840
11830 11820 11110 11210 11200 11310. Waves 5 to 9 feet subsiding
to 3 to 5 feet tonight. Waves 2 to 4 feet subsiding to 1 to 2
feet Saturday.

Superior South Central...GALE WARNING IN EFFECT...11750 12840
11830 11820 11110 11200 11210. Waves 6 to 10 feet subsiding to 4
to 7 feet tonight. Waves 3 to 6 feet subsiding to 2 to 3 feet
Saturday.

Superior East...GALE WARNING IN EFFECT...11750 12840 11830 12120
11210 11200. A chance of showers early this evening. Waves 5 to 9
feet subsiding to 4 to 6 feet tonight. Waves 3 to 5 feet
subsiding to 1 to 2 feet Saturday.

$$

WFO MQT

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weather.gov/mqt/glftable

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weather.gov/greatlakes