438
FZUS63 KMQT 102001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Thu Sep 10 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 ridging remains over the lake through tonight. A trough
averaging 29.5 inches tracks from the Great Plains north toward
Hudson Bay by Friday 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.



LSZ162-110800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Thu Sep 10 2026 /301 PM CDT Thu Sep 10 2026/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southwest 15 to 25 knots late.
Waves building to 1 to 3 feet.
.FRIDAY...Southwest winds 20 to 30 knots backing south late.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight, then becoming west 15 to 25 knots late. A chance
of showers and thunderstorms. Waves 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 by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots becoming northwest
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...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast gales to 35 knots veering west. A chance of
showers. Showers. Waves building to 4 to 7 feet occasionally to
9 feet.
.TUESDAY...West gales to 35 knots becoming northwest 10 to
20 knots. Waves subsiding to 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 Thu Sep 10 2026

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southwest 20 to 30 knots late.
Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds to 30 knots with a few gale force gusts
to 35 knots possible diminishing to 20 to 30 knots late. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
1 to 3 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. A slight chance of showers through midnight. A
chance of thunderstorms. Showers after midnight. Waves building
to 2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. 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 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.MONDAY...Southeast gales to 35 knots becoming south gales to
40 knots. Showers. Waves building to 5 to 8 feet occasionally to
10 feet.
.TUESDAY...West gales to 40 knots becoming northwest 20 to
30 knots. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to calm to 2 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 Thu Sep 10 2026

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...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 building to
2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid 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. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 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 35 knots veering south. A chance of
showers, then showers. Waves building to 5 to 9 feet occasionally
to 11 feet.
.TUESDAY...West gales to 40 knots becoming northwest 20 to
30 knots. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding 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 Thu Sep 10 2026

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to 25 knots
after midnight, then veering southwest late. Waves calm to
2 feet.
.FRIDAY...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 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of showers. A slight chance of
thunderstorms after midnight. Waves building to 2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid 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 veering northwest
after midnight. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves subsiding to 2 to
4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.MONDAY...Southeast gales to 40 knots veering south. A chance of
showers, then showers. Waves building to 5 to 9 feet occasionally
to 11 feet.
.TUESDAY...West gales to 40 knots becoming northwest 20 to
30 knots. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 1 to 3 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 Thu Sep 10 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.FRIDAY...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.
.FRIDAY NIGHT...South winds 20 to 30 knots. A chance of showers.
A slight chance of thunderstorms after midnight. Waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY...West winds 20 to 30 knots. A chance of showers and a
slight chance of thunderstorms through early afternoon. Waves
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. 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
7 to 10 feet occasionally to 13 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
35 knots. Waves subsiding to 2 to 4 feet.

$$

LSZ267-110800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Thu Sep 10 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then increasing to 10 to 20 knots late. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots. A chance of showers
and a slight chance of thunderstorms after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 20 to 30 knots veering west by mid
afternoon. A slight chance of thunderstorms through early
afternoon. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 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 winds 15 to 25 knots becoming south gales to
40 knots. A chance of showers, then showers. Waves building to
7 to 10 feet occasionally to 13 feet.
.TUESDAY...West gales to 40 knots becoming northwest 15 to
25 knots. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 2 to 4 feet.

$$

LSZ261-110200-
MAFOR 1021/
Superior West 11400 11410 11420 14530 11530. Waves 1 to 3 feet.

Superior North Central 11510 11410 12420 11530 12540 11530. Waves
1 to 3 feet tonight. Waves 2 to 4 feet building to 3 to 5 feet
Friday.

Superior South Central 11200 11310 11420 12430 11530 12430. Waves
1 to 3 feet tonight. Waves 1 to 3 feet building to 2 to 4 feet
Friday.

Superior East 11610 11500 11410 11420 14430. Waves 1 to 3 feet
tonight. Waves 2 to 4 feet Friday.

$$

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