066
FZUS63 KMQT 302001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sat Aug 30 2025

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 30.2 inch high remains over the UP the rest of the weekend,
merging with another high of 30.2 inches over the Northeast US by
Monday. Behind this, a 29.8 inch low looks to move near or over Lake
Superior late Tuesday/Tuesday night; expect the low to progressively
deepen to around 29.5 inches Wednesday. Wednesday and Thursday, this
low will lift north toward James Bay, then retrograde westward
before lifting northeast into Quebec or Hudson Bay late Friday.


LSZ162-310800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sat Aug 30 2025 /301 PM CDT Sat Aug 30 2025/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Southwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 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.
.WEDNESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ263-310800-
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 Sat Aug 30 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots diminishing to less
than 10 knots after midnight, then becoming southwest 5 to
15 knots late. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Southwest winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. Showers and a chance of
thunderstorms. Waves building to 4 to 7 feet occasionally to
9 feet.
.WEDNESDAY...North gales to 35 knots diminishing to 20 to
30 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.

$$

LSZ264-310800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sat Aug 30 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. Showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...North gales to 35 knots diminishing to 20 to
30 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.

$$

LSZ265-310800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sat Aug 30 2025

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing southeast in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
late. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. A chance of showers through
midnight. Showers likely after midnight. Waves building to 2 to
4 feet.
.WEDNESDAY...North winds 20 to 30 knots. A chance of showers.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots backing west. A chance
of showers. Waves subsiding to calm to 2 feet.

$$

LSZ266-310800-
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 Sat Aug 30 2025

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of showers through
midnight. Showers likely after midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.

$$

LSZ267-310800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sat Aug 30 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers. Waves building to
1 to 3 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots. Showers likely. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. A chance of showers. Waves subsiding to 2 to 4 feet.

$$

LSZ261-310200-
MAFOR 3021/
Superior West 11510 13500 12610 12510. Waves 1 to 2 feet.

Superior North Central 11520 11410 14400 11410 11400. Waves 1 to
2 feet.

Superior South Central 13300 11400 12500 11400 11300. Waves 1
foot or less.

Superior East 16300. Waves 1 foot or less.

$$

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