818
FZUS63 KMQT 250201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM 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...

29.8 inch troughing moves over Lake Superior 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 to 29.7 inch
Clipper low 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 29.9 to 30.0
inches returns to Lake Superior Tuesday into Wednesday.



LSZ162-250800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Fri Jul 24 2026 /901 PM CDT Fri Jul 24 2026/

.REST OF TONIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight, then diminishing to 15 to 25 knots
late. A chance of showers and thunderstorms. Waves 1 to 3 feet
building to 3 to 5 feet occasionally to 7 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...Southwest winds 5 to 15 knots backing south
after midnight, then backing east late. A slight chance of
showers and thunderstorms after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing northeast. Waves
calm to 2 feet.

$$

LSZ263-250800-
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 PM EDT Fri Jul 24 2026

.REST OF TONIGHT...Southwest winds 20 to 30 knots. A chance of
showers and thunderstorms. Waves 2 to 4 feet 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 through early afternoon. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight, then backing southeast late. A
slight chance of showers and thunderstorms after midnight. Waves
calm to 2 feet.
.SUNDAY...East winds less than 10 knots becoming northeast 5 to
15 knots by mid afternoon. A chance of showers and a slight
chance of thunderstorms through early afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots diminishing to less than
10 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds less than 10 knots veering east.
Waves calm to 2 feet.

$$

LSZ264-250800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Fri Jul 24 2026

.REST OF TONIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of showers and
thunderstorms. Waves 1 to 3 feet 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...Southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight, then backing southeast late. A
chance of showers after midnight. Waves subsiding to calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds less than 10 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.MONDAY...Northeast winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds less than 10 knots veering east. Waves
calm to 2 feet.
.WEDNESDAY...East winds less than 10 knots veering southeast.
Waves calm to 2 feet.

$$

LSZ265-250800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Fri Jul 24 2026

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

$$

LSZ266-250800-
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 PM EDT Fri Jul 24 2026

.REST OF TONIGHT...South winds 20 to 30 knots. A chance of
showers and thunderstorms after midnight. Waves 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots. 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
late. A slight chance of showers. Waves subsiding to calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. A chance of showers
and a slight chance of thunderstorms. Waves calm to 2 feet.
.MONDAY...North 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.
.MONDAY NIGHT...North winds 10 to 20 knots. A chance of showers
through midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ267-250800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Fri Jul 24 2026

.REST OF TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. A slight chance of showers and thunderstorms after
midnight. Waves 2 to 4 feet building to 3 to 5 feet occasionally
to 7 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...South winds 5 to 15 knots becoming southeast
less than 10 knots after midnight, then increasing to 5 to
15 knots late. A slight chance of showers through midnight. Waves
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers through early
afternoon. A chance of thunderstorms. Showers likely by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ261-250800-
MAFOR 2503/
Superior West 11540 11546 11540 11530 11520 12510 11400. A chance
of thunderstorms overnight and Saturday morning. Waves 1 to 3
feet building to 2 to 4 feet overnight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Saturday. Waves 2 feet or less Saturday
evening.

Superior North Central 11430 11536 12530 12520 11510 11500. A
chance of thunderstorms overnight and Saturday morning. Waves 1
to 3 feet building to 3 to 6 feet overnight. Waves 3 to 6 feet
subsiding to 2 to 4 feet Saturday. Waves 1 to 3 feet Saturday
evening.

Superior South Central 11440 11430 12530 11520 11410 12300. A
chance of showers overnight and Saturday morning. Waves 3 to 5
feet subsiding to 2 to 4 feet overnight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Saturday. Waves 1 foot or less Saturday
evening.

Superior East 12440 11430 11536 11520 11510 11500 11400. A chance
of thunderstorms Saturday morning. Waves 3 to 6 feet overnight.
Waves 3 to 6 feet subsiding to 1 to 3 feet Saturday. Waves 1 to 2
feet Saturday evening.

$$

WFO MQT

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weather.gov/mqt/glftable

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weather.gov/greatlakes