446
FZUS63 KMQT 280801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM 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 far northern Ontario this morning 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 Monday. Behind this, a 29.8 inch trough looks to
move over Lake Superior around the Tuesday/Tuesday night time period.


LSZ162-282000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Thu Aug 28 2025 /301 AM CDT Thu Aug 28 2025/

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Patchy fog.
Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet.
.TODAY...Northeast winds 15 to 25 knots becoming east 10 to
20 knots in the afternoon. Waves 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 5 to 15 knots veering west 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 veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-282000-
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 AM EDT Thu Aug 28 2025

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots late. Waves 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...South 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 diminishing to less than
10 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-282000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Thu Aug 28 2025

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming south less than
10 knots 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 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 diminishing to less than
10 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-282000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Thu Aug 28 2025

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon, then veering northeast late. Waves
subsiding to 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering southeast 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. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast 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...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ266-282000-
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 AM EDT Thu Aug 28 2025

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon. Waves 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...North winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. Waves calm to 2 feet.
.FRIDAY NIGHT...South 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...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-282000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Thu Aug 28 2025

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...North winds 15 to 25 knots diminishing to 10 to 20 knots
late. Waves subsiding to 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...Northwest 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...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-281400-
MAFOR 2809/
Superior West 13120 14210 11300. Waves 3 to 5 feet subsiding to 2
to 4 feet today. Waves 1 to 3 feet tonight.

Superior North Central 12120 12110 11100 11200 11300 11400. Waves
3 to 6 feet subsiding to 1 to 3 feet today. Waves 2 feet or less
tonight.

Superior South Central 12120 11820 11810 11110 11100 11200 11300.
Waves 3 to 6 feet today. Waves 1 to 3 feet tonight.

Superior East 12130 14820 11110 11100. Waves 3 to 6 feet
subsiding to 2 to 4 feet today. Waves 1 to 3 feet tonight.

$$

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