FZUS63 KMQT 262001

GLFLS 



Open Lake Forecast for Lake Superior

National Weather Service Marquette MI

401 PM EDT Thu Jun 26 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...



30.1 inch ridging remains over much of Lake Superior this evening as 

a 30.2 inch high is over Quebec. Meanwhile, a 29.8 inch low lifts 

into the Upper Mississippi Valley, passing near the Straits of 

Mackinaw on Friday. Weak 30.0 inch ridging then resides over the 

lake until Saturday afternoon when a 29.6 inch low passing through 

northern Ontario brings a 29.8 inch trough over the lake on Sunday. 

Monday into Tuesday, Lake Superior will be between a 30.0 inch high 

over the Plains and a low over Quebec deepening from 29.6 to 29.3 

inches.





LSZ162-270800-

Lake Superior west of a line from Saxon Harbor WI to Grand

Portage MN beyond 5NM-

401 PM EDT Thu Jun 26 2025 /301 PM CDT Thu Jun 26 2025/



.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. A chance

of showers. Waves 2 to 4 feet building to 3 to 5 feet

occasionally to 7 feet. 

.TONIGHT...Northeast winds 15 to 25 knots. Showers. Waves

building to 3 to 6 feet occasionally to 8 feet. 

.FRIDAY...Northeast winds 10 to 20 knots becoming north 5 to

15 knots in the afternoon, then backing southwest late. A slight

chance of showers. Waves subsiding to 1 to 3 feet. 

.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after

midnight, then backing southwest late. Waves subsiding to calm to

2 feet. 

.SATURDAY...South winds 5 to 15 knots backing east by mid

afternoon. A chance of showers. A slight chance of thunderstorms

by mid afternoon. Waves calm to 2 feet. 

.SATURDAY NIGHT...East winds 5 to 15 knots veering southwest

after midnight. Showers likely and a chance of thunderstorms.

Waves calm to 2 feet. 

.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to

20 knots by mid afternoon. A chance of showers and thunderstorms.

Waves calm to 2 feet. 

.SUNDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet. 

.MONDAY...West winds 10 to 20 knots. A chance of showers. Waves

building to 1 to 3 feet, then subsiding to calm to 2 feet. 

.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet. 



$$



LSZ263-270800-

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 Jun 26 2025



.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. A chance of

showers. Waves 2 to 4 feet. 

.TONIGHT...East winds 10 to 20 knots backing northeast after

midnight. Showers. Waves building to 3 to 6 feet occasionally to

8 feet. 

.FRIDAY...Northeast winds 10 to 20 knots becoming north 5 to

15 knots in the afternoon. A chance of showers. Waves subsiding

to 2 to 4 feet. 

.FRIDAY NIGHT...West winds 5 to 15 knots diminishing to less than

10 knots late. Waves subsiding to calm to 2 feet. 

.SATURDAY...Southwest winds 5 to 15 knots backing east by mid

afternoon. A slight chance of showers by mid afternoon. Waves

calm to 2 feet. 

.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering southwest

after midnight. Showers likely and a chance of thunderstorms.

Waves calm to 2 feet. 

.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers and

thunderstorms. Waves calm to 2 feet. 

.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after

midnight. Waves calm to 2 feet. 

.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.

A chance of showers. Waves building to 1 to 3 feet, then

subsiding to calm to 2 feet. 

.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet. 



$$



LSZ264-270800-

Lake Superior from Upper Entrance to Portage Canal to Manitou

Island MI 5NM off shore to the US/Canadian Border-

401 PM EDT Thu Jun 26 2025



.LATE THIS AFTERNOON...East winds 5 to 15 knots. A slight chance

of showers. Waves calm to 2 feet. 

.TONIGHT...East winds 5 to 15 knots increasing to 15 to 25 knots.

Showers likely. Waves building to 3 to 5 feet occasionally to

7 feet. 

.FRIDAY...Northeast winds 10 to 20 knots becoming north 5 to

15 knots late. A chance of showers. Waves building to 3 to 6 feet

occasionally to 8 feet, then subsiding to 2 to 4 feet. 

.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing west after

midnight. Waves subsiding to calm to 2 feet. 

.SATURDAY...Southwest winds 5 to 15 knots backing southeast by

mid afternoon. Waves calm to 2 feet. 

.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south

after midnight. A chance of showers through midnight, then

showers likely after midnight. Waves calm to 2 feet. 

.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers.

Waves calm to 2 feet. 

.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after

midnight. Waves calm to 2 feet. 

.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.

Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. 

.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet. 



$$



LSZ265-270800-

Lake Superior West of Line from Manitou Island to Marquette MI

Beyond 5NM from shore-

401 PM EDT Thu Jun 26 2025



.LATE THIS AFTERNOON...East winds 5 to 15 knots. A slight chance

of showers. Waves calm to 2 feet. 

.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots

after midnight. Showers. A slight chance of thunderstorms after

midnight. Waves building to 3 to 6 feet occasionally to 8 feet. 

.FRIDAY...East winds 10 to 20 knots becoming northwest 5 to

15 knots in the afternoon, then increasing to 10 to 20 knots

late. A chance of showers. Waves subsiding to 2 to 4 feet. 

.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to

15 knots late. Waves subsiding to calm to 2 feet. 

.SATURDAY...West winds 5 to 15 knots becoming southeast 10 to

20 knots by mid afternoon. Waves calm to 2 feet. 

.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south

after midnight. A chance of showers through midnight, then

showers likely and a chance of thunderstorms after midnight.

Waves calm to 2 feet. 

.SUNDAY...South winds 10 to 20 knots. A chance of showers through

early afternoon. A chance of thunderstorms. Showers likely by mid

afternoon. Waves calm to 2 feet. 

.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after

midnight. A chance of showers through midnight. Waves calm to

2 feet. 

.MONDAY...West winds 10 to 20 knots. Waves calm to 2 feet. 

.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet. 



$$



LSZ266-270800-

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 Jun 26 2025



.LATE THIS AFTERNOON...East winds 5 to 15 knots. A slight chance

of showers. Waves calm to 2 feet. 

.TONIGHT...East winds 5 to 15 knots increasing to 15 to 25 knots.

A chance of showers through midnight, then showers and a slight

chance of thunderstorms after midnight. Waves building to 3 to

6 feet occasionally to 8 feet. 

.FRIDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots

in the afternoon, then becoming northwest 10 to 20 knots late. A

chance of showers. Waves subsiding to 2 to 4 feet. 

.FRIDAY NIGHT...Northwest winds 10 to 20 knots increasing to

15 to 25 knots after midnight, then diminishing to 10 to 20 knots

late. A slight chance of showers through midnight. Waves

subsiding to 1 to 3 feet. 

.SATURDAY...Northwest winds 5 to 15 knots backing southeast by

mid afternoon. Waves subsiding to calm to 2 feet. 

.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south

after midnight. A chance of showers. Waves calm to 2 feet. 

.SUNDAY...South winds 10 to 20 knots. A chance of showers through

early afternoon. A chance of thunderstorms. Showers likely by mid

afternoon. Waves calm to 2 feet. 

.SUNDAY NIGHT...South winds 10 to 20 knots veering west after

midnight. A chance of showers. Waves calm to 2 feet. 

.MONDAY...West winds 10 to 20 knots. Waves building to 1 to

3 feet, then subsiding to calm to 2 feet. 

.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet. 



$$



LSZ267-270800-

Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off

shore to the US/Canadian border-

401 PM EDT Thu Jun 26 2025



.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to

2 feet. 

.TONIGHT...Southeast winds 10 to 20 knots backing east after

midnight, then increasing to 15 to 25 knots late. A chance of

showers through midnight, then showers and a slight chance of

thunderstorms after midnight. Waves building to 3 to 5 feet

occasionally to 7 feet. 

.FRIDAY...Southeast winds 10 to 20 knots diminishing to 5 to

15 knots in the afternoon, then becoming west 10 to 20 knots

late. A slight chance of thunderstorms through early afternoon. A

chance of showers. Waves subsiding to calm to 2 feet, then

building to 1 to 3 feet. 

.FRIDAY NIGHT...Northwest winds 10 to 20 knots. A slight chance

of showers. Waves 1 to 3 feet. 

.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to

15 knots by mid afternoon. Waves subsiding to calm to 2 feet. 

.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south

10 to 20 knots after midnight. A chance of showers. Waves calm to

2 feet. 

.SUNDAY...South winds 10 to 20 knots. A chance of showers through

early afternoon. Showers likely by mid afternoon. Waves calm to

2 feet. 

.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Showers likely

through midnight, then a chance of showers after midnight. Waves

calm to 2 feet. 

.MONDAY...West winds 10 to 20 knots. Waves calm to 2 feet. 

.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet. 



$$



LSZ261-270200-

MAFOR 2621/

Superior West 11120 11126 12136 12130 11820 11710. Waves 3 to 6

feet. 



Superior North Central 12210 11226 12236 11136 11120 11820. Waves

1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 6 feet

Friday. 



Superior South Central 11200 11210 11326 12226 11220 11110 11720.

Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5

feet Friday. 



Superior East 11210 11310 11326 12236 11226 11220 11210. Waves 1

to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet

subsiding to 2 to 3 feet 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

