220
FZUS63 KMQT 111401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 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-
1001 AM EDT Fri Sep 11 2026 /901 AM CDT Fri Sep 11 2026/

.REST OF 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 2 to 4 feet 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-
1001 AM EDT Fri Sep 11 2026

.REST OF TODAY...Southwest winds 20 to 30 knots backing south
late. Waves 3 to 5 feet occasionally to 7 feet 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-
1001 AM EDT Fri Sep 11 2026

.REST OF 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 3 to 5 feet occasionally to 7 feet 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-
1001 AM EDT Fri Sep 11 2026

.REST OF 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 1 to 3 feet 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-
1001 AM EDT Fri Sep 11 2026

.REST OF 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 2 to 4 feet 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
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 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-
1001 AM EDT Fri Sep 11 2026

.REST OF TODAY...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves 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.

$$

LSZ261-112000-
MAFOR 1115/
Superior West 11530 11520 12420 11436 12530 11630. A chance of
thunderstorms tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet
this afternoon. Waves 1 to 3 feet tonight and Saturday morning.

Superior North Central 11540 11430 13420 11436 11536 11530. A
chance of thunderstorms tonight. Waves 3 to 5 feet subsiding to 2
to 4 feet this afternoon. Waves 2 to 4 feet tonight and Saturday
morning.

Superior South Central 12430 14440 11430 11540. A chance of
showers tonight and Saturday morning. Waves 2 to 4 feet this
afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight.
Waves 2 to 4 feet Saturday morning.

Superior East 12430 13440 11430 12440. A chance of showers
overnight and Saturday morning. Waves 2 to 4 feet building to 3
to 5 feet this afternoon. Waves 3 to 6 feet tonight and Saturday
morning.

$$

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