177
FZUS63 KMQT 112025
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
425 PM EDT Mon May 11 2026

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 30.3 inch high over the Upper Great Lakes this afternoon departs
for the Lower Great Lakes this evening. Behind it, a 29.7 inch
Clipper descends over far western Lake Superior Tuesday morning and
crosses Upper Michigan through Tuesday evening. As the Clipper
departs eastward early Wednesday, ridging moves back over Lake
Superior, building to 30.1 inches Wednesday night into Thursday.
This ridging is pressed southeast to the Lower Great Lakes late
Thursday into Friday while a 29.1 inch low emanates off the Northern
Rockies. This low is expected to bring troughing of 29.6 inches over
Lake Superior on Friday and persisting through Saturday.


LSZ162-120430-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
425 PM EDT Mon May 11 2026 /325 PM CDT Mon May 11 2026/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Rain showers and a slight chance of thunderstorms
after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southeast winds 15 to 25 knots backing east in the
afternoon, then becoming north 10 to 20 knots late. A chance of
rain showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots becoming northwest
5 to 15 knots late. A slight chance of rain showers through
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots diminishing to less
than 10 knots 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 becoming south 15 to
25 knots after midnight. A chance of rain showers through
midnight, then rain showers likely after midnight. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.FRIDAY...Southwest winds 15 to 25 knots veering west. A chance
of rain showers. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ263-120430-
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-
425 PM EDT Mon May 11 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. A chance of rain showers after midnight.
Waves building to 2 to 4 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then becoming north 15 to 25 knots
late. Rain showers through early afternoon, then a chance of rain
showers by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of rain showers through
midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots becoming north
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds less than 10 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. A chance of rain showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY...South winds 15 to 25 knots veering southwest. A chance
of rain showers. Waves subsiding to 2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots becoming northeast 5 to
15 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ264-120430-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
425 PM EDT Mon May 11 2026

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 15 to
25 knots. A slight chance of rain showers after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to gales to
35 knots in the afternoon, then diminishing to 20 to 30 knots
late. Rain showers. Waves building to 5 to 8 feet occasionally to
10 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight, then increasing to 15 to 25 knots late. A slight
chance of rain showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds less than 10 knots becoming southeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. A chance of rain showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots. A chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-120430-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
425 PM EDT Mon May 11 2026

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...
...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY
AFTERNOON...

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then becoming south 20 to 30 knots late.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Southeast winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Rain showers through early afternoon,
then a chance of rain showers by mid afternoon. Waves building to
4 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of rain showers. Waves subsiding to 2 to
4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. Waves building to
5 to 8 feet occasionally to 10 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. A chance of rain showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots veering southwest. A chance
of showers. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.

$$

LSZ266-120430-
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-
425 PM EDT Mon May 11 2026

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...
...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY
AFTERNOON...

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 15 to
25 knots after midnight, then becoming south 20 to 30 knots late.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...South winds 20 to 30 knots becoming southeast gales to
35 knots in the afternoon, then diminishing to 20 to 30 knots
late. Rain showers. Waves building to 5 to 8 feet occasionally to
10 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots becoming north 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
A chance of rain showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.WEDNESDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. Waves building to 5 to 9 feet occasionally to 11 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots veering southeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots becoming south
gales to 35 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...South gales to 35 knots becoming southwest 20 to
30 knots. A chance of rain showers. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ267-120430-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
425 PM EDT Mon May 11 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds less than 10 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of rain showers through early
afternoon, then rain showers by mid afternoon. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Southeast winds 15 to 25 knots backing east
after midnight, then backing north late. Rain showers likely
through midnight, then a chance of rain showers after midnight.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 20 to
30 knots by mid afternoon. A slight chance of rain showers
through early afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...South winds 15 to 25 knots. A chance of rain showers.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ261-120430-
MAFOR 1121 AMD/
Superior West 11200 12210 11320 11326 11336 11330 11120. Waves 1
to 3 feet.

Superior North Central...GALE WARNING IN EFFECT...11400 11310
11320 12330 12346 11356. Waves 2 feet or less building to 2 to 4
feet tonight. Waves 3 to 6 feet building to 5 to 8 feet Tuesday.

Superior South Central...GALE WARNING IN EFFECT...11210 12320
12440 11346 12356. Waves 2 feet or less building to 2 to 4 feet
tonight. Waves 3 to 6 feet building to 5 to 8 feet Tuesday.

Superior East...GALE WARNING IN EFFECT...11600 11300 11310 11320
12330 11336 11346. Waves 1 to 3 feet tonight. Waves 1 to 3 feet
building to 3 to 6 feet Tuesday.

$$

Thompson

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

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