613
FZUS63 KMQT 091934
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
334 PM EDT Sun Mar 9 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...A 29.5 inch low pressure east of Lake Winnipeg this
morning skirts the northern shore of Lake Superior today. This low
is then followed by a deeper low at 29.3 inches tracking near the
lake Monday night. In the wake of the deeper low pressure, high
pressure builds up to 30.1 inches over the Upper Great Lakes late
Tuesday. 30.1 inch ridging remains in place over Lake Superior
Wednesday before low pressure ejecting out of the Plains leads to
pressure falls down to 29.7 inches over the lake by Thursday
night.



LSZ162-100345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
334 PM EDT Sun Mar 9 2025 /234 PM CDT Sun Mar 9 2025/

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH LATE MONDAY
NIGHT...

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. A slight chance of rain showers
through midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 20 to 30 knots.
A chance of rain showers, then rain showers. Waves building to
4 to 7 feet occasionally to 9 feet.

$$

LSZ263-100345-
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-
334 PM EDT Sun Mar 9 2025

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then backing south late. Waves subsiding to calm
to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots late. Waves building to 1 to 3 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming northwest
gales to 45 knots after midnight, then becoming north gales to
40 knots late. A chance of rain showers. A slight chance of snow
showers after midnight. Freezing spray after midnight. Waves
building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...Northwest winds 20 to 30 knots becoming west 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming south 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots veering southeast. Waves
building to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of rain showers, then rain showers. Waves building to
6 to 9 feet occasionally to 11 feet.

$$

LSZ264-100345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
334 PM EDT Sun Mar 9 2025

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon, then veering southwest late. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming northwest
gales to 45 knots after midnight, then veering north late. A
chance of rain showers through midnight. A chance of snow
showers. Freezing spray after midnight. Waves building to 10 to
14 feet occasionally to 18 feet.
.TUESDAY...Northwest gales to 35 knots becoming west 15 to
25 knots by mid afternoon. Freezing spray through early
afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots. Waves building to 2 to
4 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 20 to
30 knots. Rain showers likely. Waves building to 7 to 10 feet
occasionally to 13 feet.

$$

LSZ265-100345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
334 PM EDT Sun Mar 9 2025

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 2 to
4 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming southwest 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming northwest
gales to 40 knots after midnight. A chance of rain showers. A
chance of snow showers after midnight. Heavy freezing spray after
midnight. Waves building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots by mid afternoon. Freezing spray through early
afternoon. A slight chance of snow showers through early
afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. Rain showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ266-100345-
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-
334 PM EDT Sun Mar 9 2025

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 5 to
15 knots after midnight, then backing southwest late. Waves
subsiding to 1 to 3 feet.
.MONDAY...South winds 5 to 15 knots increasing to 15 to 25 knots
in the afternoon. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight, then becoming northwest gales
to 40 knots late. A chance of rain showers. A slight chance of
snow showers after midnight. Freezing spray after midnight. Waves
building to 10 to 14 feet occasionally to 18 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of snow showers
through early afternoon. Freezing spray. Waves subsiding to 4 to
7 feet occasionally to 9 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. Rain showers likely. Waves building to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ267-100345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
334 PM EDT Sun Mar 9 2025

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.MONDAY...South winds 5 to 15 knots increasing to 15 to 25 knots
in the afternoon. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming northwest
gales to 35 knots late. Freezing spray after midnight. A chance
of snow showers, possibly mixed with rain after midnight. Waves
building to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...Northwest gales to 40 knots diminishing to 20 to
30 knots by mid afternoon. A slight chance of snow showers
through early afternoon. Freezing spray. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots backing southeast
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. Rain showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ261-100345-
MAFOR 0921/
Superior West 11620 11610 11600 11500 12400 12510. Waves 3 to 5
feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less
Monday.

Superior North Central 11640 11620 11610 11600 11500 11310 11320
11420. Waves 3 to 6 feet subsiding to 2 to 4 feet tonight. Waves
1 to 3 feet Monday.

Superior South Central 11640 11630 11610 11600 11500 11400 11410
11420. Waves 2 to 4 feet building to 3 to 5 feet, then subsiding
to 1 to 3 feet tonight. Waves 1 to 3 feet Monday.

Superior East 11640 11740 11720 11610 11500 11400 12420. Waves 3
to 6 feet tonight. Waves 2 to 4 feet Monday.

$$

LC

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

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