310
FZUS63 KMQT 241401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Fri Jul 24 2026

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...

30.0 inch remnant ridging over Lake Superior this morning gives way
to 29.8 inch troughing tonight as a parent 29.3 inch low tracks
across Hudson Bay. Pressure holds at around 29.8 inches over the
lake through early Sunday. A 29.6 inch Clipper low then moves into
the Upper Great Lakes or Upper Midwest by Monday before departing
east towards the St. Lawrence Seaway at 29.4 inches on Tuesday.
Behind the Clipper, weak ridging of 29.8 to 29.9 inches returns to
Lake Superior Tuesday into Wednesday.



LSZ162-242000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Fri Jul 24 2026 /901 AM CDT Fri Jul 24 2026/

.REST OF TODAY...Southwest winds 10 to 20 knots backing south
late. Waves calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. A slight chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.

$$

LSZ263-242000-
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 AM EDT Fri Jul 24 2026

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon, then becoming south 10 to
20 knots late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 15 to 25 knots. A chance of showers
and thunderstorms. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots becoming east less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...East winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. A slight chance of showers. A slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots becoming north less than
10 knots. Waves calm to 2 feet.

$$

LSZ264-242000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Fri Jul 24 2026

.REST OF TODAY...Southwest winds 10 to 20 knots backing south
late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight. A chance of showers through midnight. A
chance of thunderstorms. Showers likely after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon, then becoming southwest 5 to 15 knots
late. A slight chance of showers and thunderstorms through early
afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots becoming east less
than 10 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast by mid
afternoon. A slight chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds less than 10 knots backing northeast
after midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing north. A chance of
thunderstorms. A chance of showers. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots diminishing to less than
10 knots. Waves calm to 2 feet.

$$

LSZ265-242000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Fri Jul 24 2026

.REST OF TODAY...Southwest winds 10 to 20 knots backing southeast
late. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight. A chance of showers. A slight chance of
thunderstorms after midnight. Waves building to 2 to 4 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then backing southwest late. A slight
chance of thunderstorms through early afternoon. A slight chance
of showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots backing north after
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots backing north. A chance of
thunderstorms. A chance of showers. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.

$$

LSZ266-242000-
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 AM EDT Fri Jul 24 2026

.REST OF TODAY...Southwest winds 10 to 20 knots becoming south
5 to 15 knots in the afternoon, then increasing to 15 to 25 knots
late. Waves 1 to 3 feet subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.TONIGHT...South winds 15 to 25 knots. A chance of showers and a
slight chance of thunderstorms after midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon. A chance of showers and a slight
chance of thunderstorms. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of showers. Waves subsiding to
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots backing northeast after
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots becoming north 10 to 20 knots.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-242000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Fri Jul 24 2026

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
late. Waves calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots. A slight chance of showers
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. A chance of showers and a slight chance of thunderstorms.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. A slight chance of showers through midnight.
Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming east 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.MONDAY...North winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-242000-
MAFOR 2415/
Superior West 12510 11420 11530 11430 11540 12530. A chance of
showers and thunderstorms overnight and Saturday morning. Waves 2
feet or less this afternoon. Waves 1 to 3 feet building to 2 to 4
feet tonight. Waves 2 to 4 feet Saturday morning.

Superior North Central 11520 12410 11420 11430 12536 11530. A
chance of thunderstorms overnight and Saturday morning. Waves 2
to 4 feet subsiding to 1 to 3 feet this afternoon. Waves 1 to 3
feet building to 3 to 6 feet tonight. Waves 3 to 6 feet Saturday
morning.

Superior South Central 11410 11320 11330 12430 13520. A chance of
showers overnight and Saturday morning. Waves 1 foot or less
building to 1 to 3 feet this afternoon. Waves 2 to 4 feet
tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet Saturday
morning.

Superior East 12410 11320 14430 11426. A chance of thunderstorms
Saturday morning. Waves 1 to 2 feet this afternoon. Waves 1 to 3
feet building to 3 to 6 feet tonight. Waves 3 to 6 feet Saturday
morning.

$$

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