557
FZUS63 KMQT 110801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM 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...

30.0 inch ridge is exiting eastward as a 29.6 inch trough moves
across the Northern Plains. The trough tracks towards Hudson Bay by
this afternoon, bringing 29.8 inch troughing to the lake. A cold
front and 29.7 inch trough passes through on Saturday with ridging
in its wake reaching 30.0 inches by Sunday. This strengthens further
to 30.2 inches Monday.



LSZ162-112000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Fri Sep 11 2026 /300 AM CDT Fri Sep 11 2026/

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. Waves 1 to
3 feet.
.TODAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then becoming south 15 to 25 knots
late. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TONIGHT...South winds 15 to 25 knots veering southwest late.
Showers through midnight. A chance of thunderstorms. A chance of
showers after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. 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 veering east after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast gales to 35 knots veering west. Showers.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West gales to 35 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-112000-
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 Fri Sep 11 2026

.EARLY THIS MORNING...Southwest winds 20 to 30 knots. Waves 2 to
4 feet.
.TODAY...Southwest winds 20 to 30 knots backing south late. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots veering southwest late. A
chance of showers through midnight. A chance of thunderstorms.
Showers after midnight. Waves building to 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast gales to 35 knots becoming west gales to
40 knots. A chance of showers. Showers. Waves building to 5 to
8 feet occasionally to 10 feet.
.TUESDAY...West gales to 40 knots becoming northwest 15 to
25 knots. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to calm to 2 feet.

$$

LSZ264-112000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Fri Sep 11 2026

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TODAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then becoming south 10 to 20 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers through midnight. A
chance of thunderstorms. Showers after midnight. Waves building
to 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible. A slight chance of
showers through early afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. 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 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast gales to 40 knots becoming south gales to
45 knots. A chance of showers, then showers. Waves building to
8 to 11 feet occasionally to 14 feet, then subsiding to 6 to
9 feet occasionally to 11 feet.
.TUESDAY...West gales to 40 knots becoming northwest 15 to
25 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-112000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Fri Sep 11 2026

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TODAY...Southwest winds 20 to 30 knots becoming south 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. Waves building to 2 to 4 feet.
.TONIGHT...South winds 20 to 30 knots. A chance of showers and a
slight chance of thunderstorms. Waves 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. 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 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast gales to 40 knots becoming south gales to
45 knots. Showers. Waves building to 6 to 10 feet occasionally to
13 feet.
.TUESDAY...West gales to 45 knots becoming northwest 15 to
25 knots. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to calm to 2 feet.

$$

LSZ266-112000-
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 Fri Sep 11 2026

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 1 to
3 feet.
.TODAY...South winds 20 to 30 knots diminishing to 15 to 25 knots
in the afternoon, then increasing to 20 to 30 knots late. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 20 to 30 knots. A chance of showers and a
slight chance of thunderstorms. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. A slight chance of thunderstorms through early
afternoon. A slight chance of showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast gales to 40 knots becoming south gales to
45 knots. A chance of showers, then showers. Waves building to
9 to 12 feet occasionally to 15 feet.
.TUESDAY...West gales to 45 knots becoming northwest 20 to
30 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ267-112000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Fri Sep 11 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TODAY...South winds 15 to 25 knots increasing to 20 to 30 knots
late. Waves building to 2 to 4 feet.
.TONIGHT...South winds 20 to 30 knots. A slight chance of showers
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet.
.SATURDAY...South winds 20 to 30 knots veering west in the
afternoon. A slight chance of thunderstorms through early
afternoon. A chance of showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 15 to 25 knots becoming south gales to
40 knots. A chance of showers, then showers. Waves building to
7 to 11 feet occasionally to 14 feet.
.TUESDAY...West gales to 40 knots becoming northwest 15 to
25 knots. Waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 1 to 3 feet.

$$

LSZ261-111400-
MAFOR 1109/
Superior West 13530 11520 12420 11436 11530. A chance of
thunderstorms tonight. Waves 1 to 3 feet building to 2 to 4 feet,
then subsiding to 1 to 3 feet today. Waves 1 to 3 feet tonight.

Superior North Central 11530 12540 11430 13420 11436. A chance of
thunderstorms tonight. Waves 1 to 3 feet building to 3 to 5 feet,
then subsiding to 2 to 4 feet today. Waves 2 to 4 feet tonight.

Superior South Central 11530 13430 14440. A chance of showers
tonight. Waves 1 to 3 feet building to 2 to 4 feet today. Waves 3
to 5 feet subsiding to 2 to 4 feet tonight.

Superior East 11420 13430 13440 11430. Waves 2 to 4 feet building
to 3 to 5 feet today. Waves 3 to 6 feet tonight.

$$

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