443
FZUS63 KMQT 100801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM 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 moves over Lake Superior today, dropping SE
into Lower Michigan tonight and Saturday 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.


LSZ162-102000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Fri Oct 10 2025 /301 AM CDT Fri Oct 10 2025/

.EARLY THIS MORNING...Southwest winds 20 to 30 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...West winds 20 to 30 knots veering northwest in the
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.TONIGHT...North winds 10 to 20 knots becoming northeast 5 to
15 knots late. Waves subsiding to 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 south 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Southeast winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots. Showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-102000-
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 Fri Oct 10 2025

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

.EARLY THIS MORNING...Southwest winds 20 to 30 knots. A chance of
showers and a slight chance of thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet.
.TODAY...West gales to 35 knots veering northwest in the
afternoon. A slight chance of showers. Waves building to 4 to
7 feet occasionally to 9 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then becoming northeast 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.SATURDAY...East winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. Waves building to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots becoming southeast 20 to
30 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...South gales to 35 knots. A chance of showers
through midnight, then showers likely after midnight. Waves 4 to
7 feet occasionally to 9 feet.
.MONDAY...West gales to 35 knots becoming northwest 15 to
25 knots. A chance of rain showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then 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.

$$

LSZ264-102000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Fri Oct 10 2025

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

.EARLY THIS MORNING...South winds 20 to 30 knots. Showers likely
and a slight chance of thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet building to 4 to 7 feet occasionally to
9 feet.
.TODAY...Southwest gales to 35 knots becoming northwest gales to
40 knots in the afternoon, then veering north late. A chance of
showers. Waves building to 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 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast late.
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 2 to 4 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
through midnight, then showers likely after midnight. Waves
building to 7 to 10 feet occasionally to 13 feet.
.MONDAY...West gales to 35 knots becoming northwest 15 to
25 knots. A chance of showers. 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.

$$

LSZ265-102000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Fri Oct 10 2025

...GALE WARNING IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH
THIS EVENING...

.EARLY THIS MORNING...Southwest gales to 35 knots. Showers. Waves
2 to 4 feet.
.TODAY...Southwest gales to 35 knots becoming northwest gales to
40 knots in the afternoon. A chance of showers. Waves building to
5 to 8 feet occasionally to 10 feet.
.TONIGHT...North gales to 35 knots diminishing to 15 to 25 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 2 to 4 feet.
.SUNDAY...South winds 15 to 25 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.
Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. Showers likely. Waves subsiding to 2 to 4 feet.
.TUESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-102000-
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 Fri Oct 10 2025

...GALE WARNING IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH
THIS EVENING...

.EARLY THIS MORNING...South gales to 35 knots. Showers. Waves
3 to 6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet.
.TODAY...Southwest gales to 35 knots veering northwest late.
Showers through early afternoon, then a chance of showers by mid
afternoon. Waves building to 4 to 8 feet occasionally to 10 feet.
.TONIGHT...North gales to 35 knots diminishing to 15 to 25 knots.
A slight chance of showers through midnight. Waves building to
7 to 10 feet occasionally to 13 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. 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 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots becoming southeast gales to
35 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...Southeast gales to 35 knots veering south after
midnight. A chance of showers after midnight. Waves building to
7 to 10 feet occasionally to 13 feet.
.MONDAY...South gales to 35 knots becoming northwest 15 to
25 knots. Showers likely, then a chance of showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.

$$

LSZ267-102000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Fri Oct 10 2025

.EARLY THIS MORNING...South winds 20 to 30 knots. A chance of
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...South winds to 30 knots with a few gale force gusts to
35 knots possible veering southwest in the afternoon, then
becoming west 20 to 30 knots late. Showers through early
afternoon, then 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.
.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 5 feet occasionally to 7 feet.
.SATURDAY...Northeast winds 10 to 20 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 after midnight. Waves building to 1 to 3 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 15 to 25 knots veering northwest. Showers
likely, then a chance of showers. Waves subsiding to 2 to 4 feet,
then building to 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.

$$

LSZ261-101400-
MAFOR 1009/
Superior West...GALE WARNING IN EFFECT...11540 11640 12740 12730
12820. Waves 3 to 6 feet today. Waves 3 to 5 feet subsiding to 1
to 3 feet tonight.

Superior North Central...GALE WARNING IN EFFECT...11446 11546
12750 11850 12840 11830. Waves 3 to 6 feet building to 6 to 9
feet today. Waves 5 to 9 feet subsiding to 3 to 6 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...12546 11650
12750 11850 11840 11830. Waves 3 to 6 feet building to 5 to 8
feet today. Waves 6 to 10 feet subsiding to 4 to 7 feet tonight.

Superior East...GALE WARNING IN EFFECT...11440 11446 11546 11656
11750 12840 11830. Waves 5 to 8 feet.

$$

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