320
FZUS63 KMQT 282002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 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 this
evening 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-
401 PM EDT Thu Aug 28 2025 /301 PM CDT Thu Aug 28 2025/

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast late. Waves
subsiding to 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-
401 PM EDT Thu Aug 28 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots veering south late. Waves
subsiding to 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-
401 PM EDT Thu Aug 28 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight.
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-
401 PM EDT Thu Aug 28 2025

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight, then veering south late. Waves subsiding to 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-
401 PM EDT Thu Aug 28 2025

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves subsiding to 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-
401 PM EDT Thu Aug 28 2025

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast after
midnight, then diminishing to 5 to 15 knots late. Waves 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.

$$

LSZ261-290200-
MAFOR 2821/
Superior West 13210 11310 14300. Waves 1 to 3 feet tonight. Waves
1 foot or less Friday.

Superior North Central 11110 11200 11300 12400 12500 11400. Waves
1 to 3 feet subsiding to 1 foot or less tonight. Waves 1 foot or
less Friday.

Superior South Central 11110 12100 11200 11400 11500 11400 11300.
Waves 2 to 4 feet subsiding to 1 to 2 feet tonight. Waves 1 foot
or less Friday.

Superior East 12820 12110 11100 11800 11700 11600. Waves 1 to 3
feet tonight. Waves 1 foot or less Friday.

$$

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