426
FZUS63 KMQT 010201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Wed Sep 30 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...

29.8 inch troughing lingers over the lake through tomorrow morning
between a 29.0 inch Hudson Bay low and another 29.7 inch low over
the South Plains. High pressure builds to 30.2 inches over the
northern Plains tomorrow night into Friday before shifting east to
the Great Lakes Friday night and Saturday. 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.



LSZ162-010800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Wed Sep 30 2026 /901 PM CDT Wed Sep 30 2026/

.REST OF TONIGHT...West winds 5 to 15 knots becoming northwest
10 to 20 knots late. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then increasing to 15 to 25 knots late. Waves calm to
2 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. Waves building
to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. 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 diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ263-010800-
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 Wed Sep 30 2026

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

$$

LSZ264-010800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Wed Sep 30 2026

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
after midnight, then veering north late. Patchy fog. Waves calm
to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then increasing to 15 to 25 knots late. Waves building
to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then increasing to 15 to 25 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. A chance of showers. Waves building to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest gales to 40 knots diminishing to 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 2 to 4 feet.
.MONDAY...Northwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-010800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Wed Sep 30 2026

.REST OF TONIGHT...South winds 10 to 20 knots veering west late.
Waves calm to 2 feet.
.THURSDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then backing west late. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.FRIDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots backing southwest after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots becoming west gales
to 35 knots after midnight. A chance of showers. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest gales to 45 knots diminishing to 20 to
30 knots. Waves building to 6 to 9 feet occasionally to 11 feet,
then 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.

$$

LSZ266-010800-
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 Wed Sep 30 2026

.REST OF TONIGHT...South winds 10 to 20 knots veering west late.
Patchy fog. Waves calm to 2 feet.
.THURSDAY...Northwest winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. Waves building
to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots. Waves building to 5 to
9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots backing south by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots veering west 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 45 knots. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.

$$

LSZ267-010800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Wed Sep 30 2026

.REST OF TONIGHT...South winds 10 to 20 knots veering southwest
late. Patchy fog. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. Patchy fog through early afternoon. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 2 to 4 feet, then building to 3 to 5 feet occasionally to
7 feet.
.FRIDAY...Northwest winds 20 to 30 knots. Waves building to 6 to
10 feet occasionally to 13 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. A chance of showers through
midnight, then showers likely after midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest gales to 40 knots becoming north gales to
35 knots. Waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-010800-
MAFOR 0103/
Superior West 11600 11610 12710 11610 12620 11720. Waves 2 feet
or less overnight and Thursday. Waves 1 to 3 feet Thursday
evening.

Superior North Central 11500 11610 12720 11730 12630 11730. Waves
1 to 3 feet overnight and Thursday. Waves 2 to 4 feet Thursday
evening.

Superior South Central 11410 11510 11620 11730 11740 12730 11630.
Waves 1 foot or less overnight. Waves 1 to 3 feet building to 2
to 4 feet Thursday. Waves 2 to 4 feet Thursday evening.

Superior East 11410 12510 11620 11720 12730 11720. Waves 1 to 2
feet overnight. Waves 2 to 4 feet Thursday and Thursday 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