541
FZUS63 KMQT 111324
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
924 AM EDT Tue Mar 11 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...High pressure of 30.0 inches over the northern plains
will build into Lake Superior by this evening. Ridging of at
least 29.9 inches remains anchored over Lake Superior Wednesday
before low pressure ejecting out of the Plains leads to pressure
falls down to 29.4 inches over Lake Superior by Friday. The low
pressure system deepens to 28.9 inches on early Saturday morning
over central Minnesota before moving over western Lake Superior at
29.0 inches by Saturday afternoon.

LSZ162-112130-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
924 AM EDT Tue Mar 11 2025 /824 AM CDT Tue Mar 11 2025/

.REST OF TODAY...North winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots backing southeast late. A
slight chance of snow showers after midnight. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing northeast late. A slight
chance of snow showers through early afternoon. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots backing
northwest after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. Waves calm to
2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of rain showers. Waves building to 2 to 4 feet.
.SATURDAY...East winds 15 to 25 knots becoming west 20 to
30 knots. Rain showers. A chance of snow showers. Waves building
to 3 to 6 feet occasionally to 8 feet.

$$

LSZ263-112130-
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-
924 AM EDT Tue Mar 11 2025

.REST OF TODAY...North winds 10 to 20 knots becoming northwest
5 to 15 knots in the afternoon, then backing west late. Waves
3 to 5 feet occasionally to 7 feet subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing southeast late.
A slight chance of snow showers after midnight. Waves calm to
2 feet.
.WEDNESDAY...South winds 5 to 15 knots. A slight chance of snow
showers through early afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves building
to 2 to 4 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots. A chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...East winds 15 to 25 knots becoming west 20 to
30 knots. Rain showers. A chance of snow showers. Waves building
to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.

$$

LSZ264-112130-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
924 AM EDT Tue Mar 11 2025

.REST OF TODAY...North winds 15 to 25 knots becoming northwest
10 to 20 knots in the afternoon, then becoming west 5 to 15 knots
late. Freezing spray by late morning. Waves 5 to 8 feet
occasionally to 10 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots backing south late. A slight
chance of snow showers after midnight. Waves subsiding to calm to
2 feet.
.WEDNESDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of snow showers through early
afternoon. Waves building to 2 to 4 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Southeast winds 15 to 25 knots. A chance of rain
showers. Waves building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Southeast winds 15 to 25 knots becoming west 20 to
30 knots. Rain showers, then a chance of rain showers, possibly
mixed with snow. Waves subsiding to 4 to 7 feet occasionally to
9 feet, then building to 6 to 9 feet occasionally to 11 feet.

$$

LSZ265-112130-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
924 AM EDT Tue Mar 11 2025

.REST OF TODAY...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots in the afternoon. Freezing spray by late morning.
Waves 7 to 10 feet occasionally to 13 feet subsiding to 1 to
3 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight.
A slight chance of snow showers after midnight. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots late. A slight chance of snow showers through early
afternoon. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots. Waves building
to 1 to 3 feet.
.FRIDAY...Southeast winds 15 to 25 knots. A chance of rain
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southeast winds 15 to 25 knots becoming west 20 to
30 knots. Rain showers likely, then a chance of rain showers,
possibly mixed with snow. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ266-112130-
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-
924 AM EDT Tue Mar 11 2025

...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.REST OF TODAY...North gales to 35 knots becoming northwest 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Freezing spray. Waves 9 to 12 feet occasionally to 15 feet
subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds 5 to 15 knots becoming south 10 to 20 knots
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.WEDNESDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of snow showers through early
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Southeast winds 20 to 30 knots. A chance of rain
showers. Waves building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Southeast winds 20 to 30 knots veering west. Rain
showers likely, then a chance of rain showers, possibly mixed
with snow. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 6 to 9 feet occasionally to 11 feet.

$$

LSZ267-112130-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
924 AM EDT Tue Mar 11 2025

...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.REST OF TODAY...North gales to 35 knots becoming northwest 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Freezing spray. Waves 9 to 12 feet occasionally to 15 feet
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then becoming southeast 10 to 20 knots
late. A slight chance of snow showers through early afternoon.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Southeast winds 20 to 30 knots veering south. Rain
showers. A chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$
LSZ261-112130-
MAFOR 1115/
Superior West 11710 11600 12510 11410 13310. Waves 1 to 3 feet
this afternoon. Waves 2 feet or less tonight and Wednesday
morning.

Superior North Central 11730 11710 11610 11620 11510 12410 11420.
Waves 4 to 7 feet subsiding to 2 to 4 feet this afternoon. Waves
1 to 3 feet tonight and Wednesday morning.

Superior South Central 11740 11720 11710 11610 12410 12420. Waves
6 to 10 feet subsiding to 3 to 6 feet this afternoon. Waves 2 to
4 feet subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet
building to 2 to 4 feet Wednesday morning.

Superior East 13730 11720 11610 11410 12420. Waves 6 to 10 feet
subsiding to 5 to 7 feet this afternoon. Waves 3 to 6 feet
subsiding to 2 to 3 feet tonight. Waves 2 to 4 feet Wednesday
morning.

$$

07

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

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