681
FZUS63 KMQT 281402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 AM EDT Sat Jun 28 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...

Weak 29.9 inch ridging over Lake Superior holds until Sunday when a
29.6 inch low passing through northern Ontario brings a 29.8 inch
trough over the lake by Sunday evening. Monday into Tuesday, Lake
Superior is expected to be between a 30.0 inch high over the Plains
and a low over Quebec deepening from 29.6 to 29.3 inches, with 29.8
inch troughing holding steady over the lake until Wednesday morning.
30.0 inch ridging then builds over the western Great Lakes by
Thursday night.


LSZ162-282000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EDT Sat Jun 28 2025 /902 AM CDT Sat Jun 28 2025/

.REST OF TODAY...South winds 5 to 15 knots backing east in the
afternoon. Patchy fog by late morning. A slight chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering west after midnight,
then backing southwest late. A chance of showers and a slight
chance of thunderstorms. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-282000-
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-
1002 AM EDT Sat Jun 28 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing south in
the afternoon, then backing east late. A slight chance of showers
and thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southwest after
midnight. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.MONDAY...West winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves building
to 1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-282000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EDT Sat Jun 28 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
late. Patchy fog. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering southwest late.
A chance of showers and a slight chance of thunderstorms. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. A slight chance of
thunderstorms through midnight. A chance of showers. Waves calm
to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-282000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EDT Sat Jun 28 2025

.REST OF TODAY...West winds 5 to 15 knots backing southeast in
the afternoon, then increasing to 10 to 20 knots late. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering southwest late.
A chance of showers through midnight. A chance of thunderstorms.
Showers likely after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing southeast late.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of thunderstorms through midnight. A chance of
showers. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A slight chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-282000-
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-
1002 AM EDT Sat Jun 28 2025

.REST OF TODAY...West winds 5 to 15 knots backing southwest in
the afternoon, then backing southeast late. Patchy fog by late
morning. Areas of dense fog by mid afternoon. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. A chance of showers through midnight. A slight chance
of thunderstorms. Showers likely after midnight. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing southeast late. 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 southwest after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. A chance of showers. A slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-282000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 AM EDT Sat Jun 28 2025

.REST OF TODAY...West winds 10 to 20 knots becoming southeast
5 to 15 knots late. Patchy fog. Waves 1 to 3 feet subsiding to
calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots after midnight. A slight chance of showers through
midnight, then showers likely and a slight chance of
thunderstorms after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots late. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Showers likely and a chance of
thunderstorms. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...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.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-282000-
MAFOR 2815/
Superior West 11400 13200 11306 11600 11400 11500. Waves 1 foot
or less.

Superior North Central 12500 12310 11410 11400 12500. A chance of
showers overnight and Sunday morning. Waves 1 to 2 feet.

Superior South Central 11500 13310 11410 12416 11400. A chance of
thunderstorms overnight. Waves 2 feet or less.

Superior East 11614 11504 11404 12310 11410 11416 11410. Waves 1
to 3 feet.

$$

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