585
FZUS63 KMQT 120201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Fri Sep 11 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 29.6 inch trough extends over western Lake Superior this evening
from a 29.2 inch low over Hudson Bay as a 30.0 inch high exits east
into New England. The trough crosses the lake through Saturday
afternoon accompanied by a cold front. 30.0 inch ridging builds back
in from the northern Plains on Sunday and strengthens to 30.2 inches
on Monday. A 29.5 to 29.7 inch low crosses northern Ontario on
Tuesday.



LSZ162-120800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Fri Sep 11 2026 /901 PM CDT Fri Sep 11 2026/

.REST OF TONIGHT...South winds 15 to 25 knots veering southwest
after midnight. Showers by midnight. A slight chance of
thunderstorms. A chance of showers after midnight. Waves 1 to
3 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots increasing to 20 to
30 knots late. Waves 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots becoming north less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots increasing to 20 to
30 knots by mid afternoon. Showers likely by mid afternoon. Waves
building to 1 to 3 feet.
.MONDAY NIGHT...South gales to 35 knots veering southwest after
midnight. Showers through midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ263-120800-
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-
1001 PM EDT Fri Sep 11 2026

.REST OF TONIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers and a slight chance of
thunderstorms. Waves 1 to 3 feet building to 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A slight chance of showers through
early afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots becoming southeast 20 to
30 knots by mid afternoon. A chance of showers by mid afternoon.
Waves building to 1 to 3 feet.
.MONDAY NIGHT...South gales to 35 knots veering southwest after
midnight. Showers through midnight, then a chance of showers
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.TUESDAY...West gales to 35 knots becoming northwest 20 to
30 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.

$$

LSZ264-120800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Fri Sep 11 2026

.REST OF TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering southwest late. A chance of
showers and a slight chance of thunderstorms. Waves 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A slight chance of showers through
early afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots becoming northwest
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast gales to
35 knots by mid afternoon. A chance of showers by mid afternoon.
Waves building to 2 to 4 feet.
.MONDAY NIGHT...South gales to 35 knots veering southwest after
midnight. Showers. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...West gales to 35 knots becoming northwest 20 to
30 knots. Waves subsiding to 4 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-120800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Fri Sep 11 2026

.REST OF TONIGHT...South winds 20 to 30 knots. A chance of
showers. A slight chance of thunderstorms after midnight. Waves
2 to 4 feet subsiding to 1 to 3 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming west to
30 knots with a few gale force gusts to 35 knots possible in the
afternoon. A slight chance of showers through early afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast gales to
35 knots by mid afternoon. A chance of showers by mid afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...South gales to 40 knots veering southwest after
midnight. Showers. Waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West gales to 40 knots becoming northwest 15 to
25 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.

$$

LSZ266-120800-
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-
1001 PM EDT Fri Sep 11 2026

.REST OF TONIGHT...South winds 20 to 30 knots. A chance of
showers. A slight chance of thunderstorms after midnight. Waves
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. A slight chance of showers through early afternoon.
Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Waves 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves 3 to 6 feet occasionally to
8 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast gales to
35 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...South gales to 40 knots. Showers. Waves building
to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...West gales to 35 knots becoming northwest 20 to
30 knots. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.

$$

LSZ267-120800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Fri Sep 11 2026

.REST OF TONIGHT...South winds 20 to 30 knots diminishing to
15 to 25 knots after midnight, then increasing to 20 to 30 knots
late. A slight chance of showers after midnight. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.SATURDAY...South winds 20 to 30 knots veering west in the
afternoon. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots becoming northwest
15 to 25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 4 to
7 feet occasionally to 9 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...South gales to 40 knots. Showers. Waves building
to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...West gales to 35 knots becoming northwest 15 to
25 knots. A chance of showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.

$$

LSZ261-120800-
MAFOR 1203/
Superior West 11436 11536 11530 14630 11730. Waves 1 to 3 feet
overnight. Waves 1 to 3 feet building to 2 to 4 feet Saturday.
Waves 2 to 4 feet Saturday evening.

Superior North Central 11420 11436 12530 14640. Waves 2 to 4 feet
overnight. Waves 3 to 6 feet Saturday and Saturday evening.

Superior South Central 12440 11430 11530 14640. A chance of
showers overnight and Saturday morning. Waves 3 to 5 feet
subsiding to 2 to 4 feet overnight. Waves 2 to 4 feet building to
3 to 5 feet Saturday. Waves 3 to 6 feet Saturday evening.

Superior East 14440 11530 13630. A chance of showers Saturday.
Waves 3 to 6 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