707
FZUS63 KMQT 240802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 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 today gives way to 29.8
inch troughing tonight as a parent 29.3 inch low tracks across
Hudson Bay tonight. Weak ridging of around 29.9 inches develops over
Lake Superior Saturday afternoon before weakening further to 29.8
inches by Sunday morning. A 29.6 inch Clipper low then moves into
the Upper Great Lakes or Upper Midwest by Monday before leaving east
towards the St. Lawrence Seaway at 29.4 inches on Tuesday. Behind
the Clipper, weak ridging of at least 29.8 inches returns to Lake
Superior on Tuesday, increasing to at least 29.9 inches by Wednesday
morning.



LSZ162-242000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Fri Jul 24 2026 /301 AM CDT Fri Jul 24 2026/

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...Southwest winds 10 to 20 knots backing south late. Waves
subsiding to 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. 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-
401 AM EDT Fri Jul 24 2026

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.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 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. 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-
401 AM EDT Fri Jul 24 2026

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...Southwest winds 10 to 20 knots backing south late. Waves
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. 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-
401 AM EDT Fri Jul 24 2026

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 10 to 20 knots backing southeast late.
Waves 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. 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-
401 AM EDT Fri Jul 24 2026

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.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 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 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-
401 AM EDT Fri Jul 24 2026

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.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 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.

$$

LSZ261-241400-
MAFOR 2409/
Superior West 12520 12510 11420 11530 11430 11540. A chance of
showers and thunderstorms overnight. Waves 1 to 3 feet subsiding
to 1 foot or less today. Waves 1 to 3 feet building to 2 to 4
feet tonight.

Superior North Central 13520 12410 11420 11430 11536. A chance of
thunderstorms overnight. Waves 2 to 4 feet subsiding to 1 to 3
feet today. Waves 1 to 3 feet building to 3 to 6 feet tonight.

Superior South Central 12520 11410 11320 11330 12430 11520. A
chance of showers overnight. Waves 1 to 3 feet today. Waves 2 to
4 feet tonight.

Superior East 12510 12410 11320 13430. Waves 1 to 3 feet today.
Waves 1 to 3 feet building to 3 to 6 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