882
FZUS63 KMQT 132001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sun Sep 13 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...

30.0 inch ridging strengthens to 30.2 inches tonight into Monday. A
low around 29.3 inches skirts by Lake Winnipeg into northern Ontario
Monday night, bringing 29.7 inch troughing over Lake Superior. In
its stead, 30.2 inch high pressure ridging develops over the
Northern Plains on Tuesday, which strengthens to 30.4 inches as it
cross the Upper Great Lakes by Wednesday. The high pressure ridging
looks to remain through the rest of the workweek.



LSZ162-140800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sun Sep 13 2026 /301 PM CDT Sun Sep 13 2026/

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

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots diminishing to less than
10 knots late. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. A chance of showers and a slight chance of thunderstorms by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 20 to 30 knots becoming southwest
gales to 35 knots late. Showers through midnight, then a slight
chance of showers after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West gales to 40 knots. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds less than 10 knots becoming south
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-140800-
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 Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then becoming southeast 15 to 25 knots late. A
slight chance of showers by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South gales to 35 knots veering southwest late.
Showers and a slight chance of thunderstorms through midnight,
then a chance of showers after midnight. Waves building to 5 to
8 feet occasionally to 10 feet.
.TUESDAY...West gales to 45 knots. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers. Waves calm to 2 feet.

$$

LSZ264-140800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then becoming southeast 20 to 30 knots late. Waves
building to 2 to 4 feet.
.MONDAY NIGHT...Southeast winds 20 to 30 knots becoming south
gales to 35 knots after midnight. Showers. Waves building to 6 to
10 feet occasionally to 13 feet.
.TUESDAY...Southwest gales to 45 knots veering west by mid
afternoon. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds less than 10 knots backing south by
mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers. Waves calm to 2 feet.

$$

LSZ265-140800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing southeast in the
afternoon, then increasing to 20 to 30 knots late. Waves building
to 2 to 4 feet.
.MONDAY NIGHT...South gales to 40 knots. A slight chance of
thunderstorms through midnight. Showers likely. Waves building to
6 to 9 feet occasionally to 11 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.TUESDAY...Southwest gales to 45 knots veering west by mid
afternoon. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots becoming
southwest 5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots backing southeast. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-140800-
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 Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. A slight
chance of showers. Waves 4 to 8 feet occasionally to 10 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon, then becoming southeast 20 to 30 knots
late. Waves subsiding to calm to 2 feet, then building to 2 to
4 feet.
.MONDAY NIGHT...South gales to 40 knots. A slight chance of
thunderstorms through midnight. Showers. Waves building to 8 to
11 feet occasionally to 14 feet.
.TUESDAY...Southwest gales to 40 knots veering west by mid
afternoon. Waves subsiding to 6 to 9 feet occasionally to
11 feet, then building to 9 to 12 feet occasionally to 15 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering
southwest after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering north. Waves calm
to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ267-140800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. A slight
chance of showers. Waves 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.MONDAY...West winds 5 to 15 knots backing south in the
afternoon, then backing southeast late. Waves subsiding to calm
to 2 feet.
.MONDAY NIGHT...South winds 20 to 30 knots increasing to gales to
40 knots after midnight. Showers. Waves building to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...Southwest gales to 35 knots becoming west 20 to
30 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves subsiding to 4 to 7 feet occasionally to
9 feet, then building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ261-140200-
MAFOR 1321/
Superior West 12720 11710 11700 11600 11400 11410 11310. Waves 1
to 3 feet subsiding to 1 foot or less tonight. Waves 1 foot or
less Monday.

Superior North Central 11730 11720 12710 11700 11500 11410 11420.
Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. Waves 2 feet
or less Monday.

Superior South Central 11750 11730 11720 11710 11700 11600 11410
11330. Waves 4 to 7 feet subsiding to 1 to 3 feet tonight. Waves
2 feet or less Monday.

Superior East 12730 12720 11700 11600 11500 11400. Waves 3 to 6
feet tonight. Waves 1 to 3 feet Monday.

$$

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