400
FZUS63 KMQT 060803
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 AM EDT Fri Jun 6 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...

30.0 inch high pressure ridging slowly weakens into the weekend. A
29.4 inch low moves southeast over Northern Ontario toward Lake
Superior, bringing 29.6 inch troughing to Lake Superior on Sunday.
This low weakens through the day, while a secondary 29.6 inch low
develops near Lake Huron. This low and associated troughing lifts
north into Ontario Monday morning, then slowly exits through James
Bay Tuesday. 29.9 inch ridging builds back over the lake by Tuesday
evening, then lingers until at least Thursday morning.


LSZ162-062000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 AM EDT Fri Jun 6 2025 /302 AM CDT Fri Jun 6 2025/

.EARLY THIS MORNING...North winds 5 to 15 knots. Areas of smoke.
A chance of showers. Waves calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots veering southwest in the
afternoon. A chance of showers through early afternoon. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southeast late. Areas
of smoke. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Areas of smoke through early afternoon. Isolated rain
showers by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots becoming south 10 to
20 knots after midnight. A chance of showers through midnight. A
slight chance of thunderstorms. Showers after midnight. Waves
building to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Showers. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Showers likely. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots increasing to 10 to 20 knots.
Showers, then a chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ263-062000-
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-
402 AM EDT Fri Jun 6 2025

.EARLY THIS MORNING...North winds 5 to 15 knots. Areas of smoke.
A slight chance of showers. Waves calm to 2 feet.
.TODAY...North winds less than 10 knots backing southwest in the
afternoon, then increasing to 5 to 15 knots late. A slight chance
of showers through early afternoon. Areas of smoke. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots becoming southwest less than
10 knots after midnight, then backing south late. Areas of smoke.
Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing east in the
afternoon. Isolated rain showers by mid afternoon. Waves calm to
2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A slight chance of showers through
midnight, then showers likely after midnight. Waves building to
1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Showers. Waves 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Showers likely, then a chance
of showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ264-062000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 AM EDT Fri Jun 6 2025

.EARLY THIS MORNING...North winds less than 10 knots. A slight
chance of showers. Waves calm to 2 feet.
.TODAY...North winds less than 10 knots backing northwest in the
afternoon, then backing southwest late. A slight chance of
showers through early afternoon. Areas of smoke. Waves calm to
2 feet.
.TONIGHT...Southwest winds less than 10 knots veering west after
midnight, then backing southwest late. Areas of smoke. Waves calm
to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing southeast in the
afternoon. Areas of smoke. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers after
midnight. Waves building to 2 to 4 feet.
.SUNDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Showers. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of rain showers. Waves subsiding to calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ265-062000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 AM EDT Fri Jun 6 2025

.EARLY THIS MORNING...North winds 5 to 15 knots. A slight chance
of showers. Waves calm to 2 feet.
.TODAY...Northwest winds 5 to 15 knots veering north in the
afternoon, then veering south late. A slight chance of showers.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming west less than
10 knots after midnight, then backing south late. Areas of smoke.
Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots. Showers. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots backing west. Showers likely,
then a chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-062000-
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-
402 AM EDT Fri Jun 6 2025

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. A slight
chance of showers. Waves calm to 2 feet.
.TODAY...Northwest winds 5 to 15 knots backing west late. A
slight chance of showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest after
midnight, then becoming west less than 10 knots late. Waves calm
to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of showers after midnight. Waves
building to 1 to 3 feet.
.SUNDAY...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
after midnight. Rain showers likely through midnight, then a
chance of rain showers after midnight. Waves subsiding to calm to
2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest. A chance of
rain showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ267-062000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 AM EDT Fri Jun 6 2025

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. A slight
chance of rain showers. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing north in the afternoon,
then becoming northwest 10 to 20 knots late. A slight chance of
showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west late. Waves
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering north in the
afternoon, then veering northeast late. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 10 to 20 knots. A chance of showers
through early afternoon, then showers by mid afternoon. Waves
building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers through midnight, then a chance of
showers after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots veering west. A chance
of rain showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ261-061400-
MAFOR 0609/
Superior West 11800 11100 11400 12500 11600 11800 11300. A chance
of showers this morning. Waves 1 foot or less.

Superior North Central 11800 12700 11600 12500 12600. Waves 1
foot or less.

Superior South Central 11800 12700 11800 12500 11600 11700. Waves
1 foot or less.

Superior East 11100 11200 11800 12700 11600 12700. Waves 1 foot
or less.

$$

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