604
FZUS63 KMQT 072002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sat Jun 7 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...

29.9 inch high pressure ridging slowly weakens over Lake Superior
this afternoon. Meanwhile, a 29.5 inch low moves southeast through
central Canada toward Lake Superior, bringing 29.6 inch troughing to
Lake Superior Sunday. This low slowly weakens through the day over
Ontario, then lifts north into James Bay Monday night. Weak, broad
troughing averaging 29.8 inches remains over Lake Superior
Tuesday/Wednesday before 30.1 inch ridging builds in from the north
on Thursday.


LSZ162-080800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sat Jun 7 2025 /301 PM CDT Sat Jun 7 2025/

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight, then veering south late. A slight chance
of showers through midnight. A chance of thunderstorms. Showers
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Haze and areas of smoke through early
afternoon. A chance of showers and thunderstorms. Waves building
to 2 to 4 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then veering west late. Showers
likely and a slight chance of thunderstorms. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers through early afternoon. A
slight chance of thunderstorms. Showers by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers through midnight.
Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northeast. A
chance of showers. Waves calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.

$$

LSZ263-080800-
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 PM EDT Sat Jun 7 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Haze. A slight
chance of showers. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then increasing to 15 to 25 knots late. A chance of
showers and a slight chance of thunderstorms after midnight.
Waves building to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon, then backing south late. Showers
through early afternoon. A slight chance of thunderstorms. A
chance of showers by mid afternoon. Haze and areas of smoke by
mid afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest late.
A slight chance of thunderstorms through midnight. A chance of
rain showers. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. A chance of showers. Waves
building to 1 to 3 feet.

$$

LSZ264-080800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sat Jun 7 2025

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Haze through midnight. A slight chance
of showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Showers and a slight chance of
thunderstorms through early afternoon, then a chance of showers
by mid afternoon. Haze and areas of smoke by mid afternoon. Waves
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots diminishing to less
than 10 knots late. A chance of rain showers. A slight chance of
thunderstorms after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-080800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sat Jun 7 2025

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Haze through midnight. A slight chance
of showers after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Southeast winds 15 to 25 knots veering south in the
afternoon, then becoming southeast 10 to 20 knots late. A chance
of showers and a slight chance of thunderstorms. Waves subsiding
to calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of thunderstorms through
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A chance of showers through early afternoon. A slight
chance of thunderstorms. Showers likely by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-080800-
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 PM EDT Sat Jun 7 2025

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Haze. Waves building to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots becoming southeast 10 to
20 knots late. Haze through early afternoon. A slight chance of
showers through early afternoon, then showers and a slight chance
of thunderstorms by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of thunderstorms through midnight. A
chance of rain showers. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A slight chance of thunderstorms through early
afternoon. A chance of rain showers. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing northwest after
midnight. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.THURSDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ267-080800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sat Jun 7 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Haze. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. Haze. Waves building to 2 to 4 feet.
.SUNDAY...Southeast winds 15 to 25 knots. Haze. A chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
2 to 4 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
late. Showers and a slight chance of thunderstorms through
midnight, then a chance of showers after midnight. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. A chance of showers through early
afternoon, then showers likely by mid afternoon. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering west after
midnight. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-080200-
MAFOR 0721/
Superior West 12210 11320 11420 11436 11526 12520. A chance of
thunderstorms overnight and Sunday morning. Waves 1 to 3 feet
tonight. Waves 2 to 4 feet Sunday.

Superior North Central 12320 11330 13430 11436 11426. Waves 1 to
3 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet Sunday.

Superior South Central 13320 12420 11330 11436 11326. Waves 1 to
3 feet.

Superior East 11210 11310 11320 11420 13330 11320. A chance of
showers Sunday afternoon. Waves 2 feet or less building to 2 to 3
feet tonight. Waves 3 to 5 feet Sunday.

$$

WFO MQT

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weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes