486
FZUS63 KMQT 020201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Thu Oct 1 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...

Troughing of 29.9 inches lingers over eastern Lake Superior between
29.3 troughing over northeastern Quebec and a 29.8 inch low over the
South Plains. High pressure builds to 30.2 inches over the northern
Plains tonight into tomorrow before shifting east to the Great Lakes
tomorrow night through Saturday and building to 30.3 inches. A weak
29.9 inch trough crosses Lake Superior Saturday night and Sunday,
with 30.3 inch high pressure quickly returning Sunday night into
Monday. Ridging remains in the area through Tuesday afternoon before
being replaced by troughing Wednesday morning.



LSZ162-020800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Thu Oct 1 2026 /901 PM CDT Thu Oct 1 2026/

.REST OF TONIGHT...Northwest winds 15 to 25 knots. Waves 1 to
3 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then becoming southwest 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming south less than
10 knots after midnight, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. A chance of showers through midnight. Waves
building to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 1 to 3 feet.
.TUESDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ263-020800-
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 Thu Oct 1 2026

.REST OF TONIGHT...Northwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing south late.
Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots. A slight chance of
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots becoming west 20 to
30 knots after midnight. A chance of showers. 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, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.TUESDAY...South gales to 35 knots becoming southwest 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.

$$

LSZ264-020800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Thu Oct 1 2026

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

$$

LSZ265-020800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Thu Oct 1 2026

.REST OF TONIGHT...Northwest winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots backing southwest late.
Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots becoming southwest
gales to 35 knots after midnight. Showers likely through
midnight, then a chance of showers after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest gales to 35 knots. Waves building to 5 to
9 feet occasionally to 11 feet.
.SUNDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.MONDAY...Northwest winds 15 to 25 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. Waves building to 2 to 4 feet.

$$

LSZ266-020800-
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 Thu Oct 1 2026

.REST OF TONIGHT...Northwest winds 20 to 30 knots. Sprinkles
after midnight. Waves 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Sprinkles through early afternoon. Waves building
to 6 to 9 feet occasionally to 11 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then backing southwest late. Waves
subsiding to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots becoming southwest
gales to 35 knots after midnight. Showers. Waves building to 4 to
7 feet occasionally to 9 feet.
.SUNDAY...Northwest gales to 40 knots. Waves building to 8 to
12 feet occasionally to 15 feet.
.SUNDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...Northwest winds 20 to 30 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.
.TUESDAY...South winds 20 to 30 knots becoming southwest gales to
35 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-020800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Thu Oct 1 2026

.REST OF TONIGHT...Northwest winds 15 to 25 knots. Sprinkles
after midnight. Waves 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots. Sprinkles through early
afternoon. Waves building to 5 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of showers through midnight,
then showers after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...West gales to 35 knots becoming northwest gales to
40 knots by mid afternoon. A chance of showers through early
afternoon. Waves building to 10 to 14 feet occasionally to
18 feet.
.SUNDAY NIGHT...Northwest gales to 35 knots. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-020800-
MAFOR 0203/
Superior West 11730 13720 11710 11610 12510. Waves 1 to 3 feet
overnight and Friday. Waves 2 feet or less Friday evening.

Superior North Central 11730 11720 13730 12720 11610. Waves 3 to
6 feet overnight and Friday. Waves 1 to 3 feet Friday evening.

Superior South Central 14730 11740 11730 12720. Waves 3 to 5 feet
overnight. Waves 4 to 7 feet Friday. Waves 3 to 5 feet subsiding
to 2 to 4 feet Friday evening.

Superior East 11730 12720 14730 11720. Waves 3 to 5 feet
overnight. Waves 3 to 6 feet building to 5 to 8 feet Friday.
Waves 4 to 7 feet subsiding to 3 to 6 feet Friday evening.

$$

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