589
FZUS63 KMQT 290201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Thu Aug 28 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 over northern Ontario moves over Lake Superior and
resides over the Great Lakes region through the weekend before
merging with a high of 30.2 inches over the Northeast US by Monday.
Behind this, a 29.8 inch trough looks to move over Lake Superior
around the Tuesday/Tuesday night time period.


LSZ162-290800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Thu Aug 28 2025 /901 PM CDT Thu Aug 28 2025/

.REST OF TONIGHT...East winds 5 to 15 knots veering southeast
late. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.FRIDAY NIGHT...East winds less than 10 knots veering west after
midnight, then increasing to 5 to 15 knots late. Waves calm to
2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. 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 veering west after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering north. A chance
of showers. Waves building to 1 to 3 feet.

$$

LSZ263-290800-
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 Aug 28 2025

.REST OF TONIGHT...East winds 5 to 15 knots veering south late.
Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...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 veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering north. A chance
of showers. Waves building to 2 to 4 feet.

$$

LSZ264-290800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Thu Aug 28 2025

.REST OF TONIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots becoming north 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet.

$$

LSZ265-290800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Thu Aug 28 2025

.REST OF TONIGHT...East winds 5 to 15 knots veering south late.
Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 10 to 20 knots late. Waves calm to
2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
late. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering northwest. A
chance of showers. Waves building to 1 to 3 feet.

$$

LSZ266-290800-
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 Aug 28 2025

.REST OF TONIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then backing east late. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
late. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Waves building to 2 to 4 feet.

$$

LSZ267-290800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Thu Aug 28 2025

.REST OF TONIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves 1 to 3 feet subsiding to calm to
2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet.

$$

LSZ261-290800-
MAFOR 2903/
Superior West 11210 11310 14300 12200. Waves 2 feet or less.

Superior North Central 11300 12400 12500 12400 11300. Waves 1
foot or less.

Superior South Central 11100 11200 11400 11500 11400 11300 11200
11300. Waves 2 feet or less.

Superior East 12110 11100 11800 11700 11600 11700 11100. Waves 2
feet 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