314
FZUS63 KMQT 250801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sat Jul 25 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...

Troughing around 29.8 inches persists over Lake Superior through
Sunday morning, deepening to 29.8 inches by Sunday night. 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 on Tuesday. Behind the Clipper, weak ridging of 29.9 to 30.0
inches returns to Lake Superior Tuesday into Wednesday.



LSZ162-252000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Sat Jul 25 2026 /300 AM CDT Sat Jul 25 2026/

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. A chance of
showers and thunderstorms. Waves 3 to 5 feet occasionally to
7 feet subsiding to 2 to 4 feet.
.TODAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming north less than
10 knots after midnight. A slight chance of showers and
thunderstorms after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast late. A
slight chance of showers 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
through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots becoming north less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-252000-
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-
400 AM EDT Sat Jul 25 2026

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. A chance of
showers and thunderstorms. Waves 3 to 6 feet occasionally to
8 feet.
.TODAY...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of showers through early afternoon. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots diminishing to less than
10 knots after midnight, then backing south late. A slight chance
of showers and thunderstorms after midnight. Waves calm to
2 feet.
.SUNDAY...South winds less than 10 knots becoming east 5 to
15 knots in the afternoon, then backing northeast late. A chance
of showers through early afternoon. 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. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds less than 10 knots. Waves calm to
2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ264-252000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Sat Jul 25 2026

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. Showers
likely and a chance of thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet.
.TODAY...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of showers and a slight chance of
thunderstorms through early afternoon. Waves subsiding to 1 to
3 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming south less than
10 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds less than 10 knots becoming southeast 5 to
15 knots in the afternoon, then backing northeast late. A slight
chance of showers through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds less than 10 knots increasing to
5 to 15 knots after midnight. A chance of showers. A slight
chance of thunderstorms after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. A chance of showers.
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...North winds less than 10 knots veering east. Waves
calm to 2 feet.
.WEDNESDAY...Southeast winds less than 10 knots. Waves calm to
2 feet.

$$

LSZ265-252000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Sat Jul 25 2026

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. A chance of
showers and thunderstorms. Waves 2 to 4 feet.
.TODAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots late. A slight chance of thunderstorms through early
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing east late. A slight
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...Northeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.MONDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after 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 southeast. Waves
calm to 2 feet.

$$

LSZ266-252000-
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-
400 AM EDT Sat Jul 25 2026

.EARLY THIS MORNING...South winds 15 to 25 knots. A chance of
showers and thunderstorms. Waves 3 to 6 feet occasionally to
8 feet.
.TODAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming west 5 to 15 knots late.
A slight chance of thunderstorms through early afternoon. A
chance of showers. Waves subsiding to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast in the
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering north after
midnight. 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 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...Northeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.

$$

LSZ267-252000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Sat Jul 25 2026

.EARLY THIS MORNING...South winds 20 to 30 knots. A chance of
showers and a slight chance of thunderstorms. Waves 3 to 5 feet
occasionally to 7 feet.
.TODAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. A slight chance of thunderstorms through early afternoon. A
chance of showers. Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest less than
10 knots after midnight, then backing southeast late. A slight
chance of showers through midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. A chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ261-251400-
MAFOR 2509/
Superior West 11540 11530 12520 11510 12400 11500. A chance of
showers and thunderstorms this morning. Waves 2 to 4 feet
subsiding to 1 to 3 feet today. Waves 2 feet or less tonight.

Superior North Central 11536 13520 12510 12400. A chance of
thunderstorms this morning. Waves 3 to 6 feet subsiding to 2 to 4
feet today. Waves 1 to 3 feet tonight.

Superior South Central 11430 12520 11610 11700 11300 12400. A
chance of showers this morning. Waves 2 to 4 feet subsiding to 1
to 3 feet today. Waves 1 foot or less tonight.

Superior East 11430 11526 12520 11500 11400 11500 11400. A chance
of thunderstorms this morning. Waves 3 to 6 feet subsiding to 1
to 3 feet today. Waves 2 feet or less 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