607
FZUS63 KMQT 202101
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EST Thu Nov 20 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 29.8 inch trough moves over Lake Superior today as a developing
29.7 inch low over northern Manitoba moves into Hudson Bay at 29.5
inches tonight. A 30.1 inch ridge of high pressure over the Northern
Plains and Upper Midwest on Friday moves over the Great Lakes on
Saturday. Another 29.8 inch trough then moves over Lake Superior
Saturday night into Sunday before 30.1 inch high pressure rebuilds
over the Great Lakes early next week.


LSZ162-210900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EST Thu Nov 20 2025 /301 PM CST Thu Nov 20 2025/

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...West winds 15 to 25 knots. Waves subsiding to 1 to
3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
late. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. A slight chance of rain showers in the
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast. A chance
of rain showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots increasing to 20 to
30 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ263-210900-
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 EST Thu Nov 20 2025

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 15 to 25 knots
by midnight. Waves subsiding to 3 to 5 feet occasionally to
7 feet, then building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots becoming west less
than 10 knots late. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. A chance of rain showers, possibly
mixed with snow in the afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves building to
2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots becoming west gales to
35 knots. A chance of rain showers. A chance of snow showers.
Waves building to 6 to 9 feet occasionally to 11 feet.

$$

LSZ264-210900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EST Thu Nov 20 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. A slight
chance of rain showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming west 15 to
25 knots by midnight. Waves subsiding to 3 to 5 feet occasionally
to 7 feet, then building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots becoming west less
than 10 knots late. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon. A chance of rain showers, possibly
mixed with snow in the afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. A chance of rain showers.
Waves building to 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots becoming west gales to
35 knots. A chance of rain showers, then rain showers, possibly
mixed with snow. Waves building to 6 to 9 feet occasionally to
11 feet.

$$

LSZ265-210900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EST Thu Nov 20 2025

.LATE THIS AFTERNOON...West winds 20 to 30 knots. A chance of
showers. Waves 2 to 4 feet.
.TONIGHT...West winds 20 to 30 knots. A slight chance of rain
showers in the evening. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon. A slight chance of rain showers,
possibly mixed with snow in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...West winds 20 to 30 knots diminishing to 10 to 20 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots backing southwest after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots becoming west gales to
35 knots. Rain showers likely. Snow showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ266-210900-
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 EST Thu Nov 20 2025

.LATE THIS AFTERNOON...West winds 15 to 25 knots. A chance of
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 20 to
30 knots by midnight, then backing west late. A slight chance of
rain showers. Waves building to 4 to 7 feet occasionally to
9 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of rain showers in the
morning. A slight chance of snow showers. Waves building to 5 to
8 feet occasionally to 10 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots late. A slight chance of snow showers in the
evening. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots becoming south 15 to
25 knots in the afternoon. A chance of rain showers, possibly
mixed with snow in the afternoon. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. A chance of rain showers.
Waves building to 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. Rain showers likely. Snow showers. Waves building to
6 to 9 feet occasionally to 11 feet.

$$

LSZ267-210900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EST Thu Nov 20 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Patchy
fog. Showers likely. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 20 to 30 knots veering northwest by
midnight, then backing west late. Patchy fog in the evening. A
chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...Northwest winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible. A chance of
rain showers, possibly mixed with snow. Waves building to 5 to
9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots by midnight. A slight chance of snow showers in
the evening. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest in the
afternoon. A chance of rain showers, possibly mixed with snow in
the afternoon. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. A chance of rain showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots backing southeast. A chance
of rain showers. Waves building to 1 to 3 feet.
.TUESDAY...Southeast winds 15 to 25 knots becoming southwest
20 to 30 knots. Rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ261-210300-
MAFOR 2022/
Superior West 11630 11620 13630 11730 11720 11710. Waves 3 to 5
feet subsiding to 2 to 4 feet, then building to 3 to 6 feet
tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet Friday.

Superior North Central 12730 11630 11640 13740 11730. Waves 3 to
6 feet building to 4 to 7 feet tonight. Waves 4 to 7 feet
subsiding to 3 to 6 feet Friday.

Superior South Central 11630 12730 12640 12740 11730. A chance of
rain showers early this evening. Waves 2 to 4 feet building to 3
to 6 feet tonight. Waves 4 to 7 feet subsiding to 3 to 6 feet
Friday.

Superior East 11536 11630 12730 11630 13740. A chance of snow
showers Friday morning. Waves 5 to 8 feet.

$$

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