892
FZUS63 KMQT 302001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 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...

A 29.0 inch low over Hudson Bay this afternoon has caused a 29.7
inch trough over Lake Superior. 29.8 inch troughing lingers over the
lake through Thursday morning between the Canadian low and another
29.7 low over the South Plains. High pressure builds to 30.2 inches
over the northern Plains Thursday 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-
401 PM EDT Wed Sep 30 2026 /301 PM CDT Wed Sep 30 2026/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then 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-
401 PM EDT Wed Sep 30 2026

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Patchy
fog. Waves 1 to 3 feet subsiding to calm to 2 feet.
.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 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-
401 PM EDT Wed Sep 30 2026

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then veering north late. Patchy fog. Waves subsiding to
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-
401 PM EDT Wed Sep 30 2026

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight, then 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 5 feet occasionally to
7 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-
401 PM EDT Wed Sep 30 2026

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight, then veering west late. Patchy fog.
Waves subsiding to 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 building
to 1 to 3 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-
401 PM EDT Wed Sep 30 2026

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late. A
slight chance of showers through midnight. 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.
.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.

$$

LSZ261-010200-
MAFOR 3021/
Superior West 12510 11600 11610 12710 11610 11620. Waves 2 feet
or less.

Superior North Central 12510 11500 11610 12720 11730 11630. Waves
1 to 3 feet.

Superior South Central 11300 11400 11410 11510 11620 11730 11740
11730. Waves 1 foot or less tonight. Waves 1 to 3 feet building
to 2 to 4 feet Thursday.

Superior East 11400 12410 12510 11620 11720 11730. Waves 1 to 2
feet tonight. Waves 2 to 4 feet Thursday.

$$

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