442
FZUS63 KMQT 201501
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM 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.


LSZ162-202100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EST Thu Nov 20 2025 /901 AM CST Thu Nov 20 2025/

.REST OF TODAY...Southwest winds 15 to 25 knots veering west. A
chance of rain showers late in the morning. Waves 3 to 5 feet
occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots late. 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 diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 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.
Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.

$$

LSZ263-202100-
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-
1001 AM EST Thu Nov 20 2025

.REST OF TODAY...Southwest winds 15 to 25 knots veering west. A
chance of rain showers. 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 after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest in the
afternoon. A slight chance of rain showers 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 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.

$$

LSZ264-202100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EST Thu Nov 20 2025

.REST OF TODAY...Southwest winds 15 to 25 knots veering west by
mid afternoon. Rain showers likely late in the morning, then a
chance of rain showers in the afternoon. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then increasing to 15 to 25 knots late.
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 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. 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 and snow
showers 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 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots backing south. Waves subsiding
to calm to 2 feet.

$$

LSZ265-202100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EST Thu Nov 20 2025

.REST OF TODAY...Southwest winds 15 to 25 knots increasing to
20 to 30 knots by late morning, then veering west by mid
afternoon. A chance of rain showers. Waves 1 to 3 feet building
to 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. Waves subsiding to 2 to
4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. 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 and snow
showers in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ266-202100-
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-
1001 AM EST Thu Nov 20 2025

.REST OF TODAY...Southwest winds 15 to 25 knots. Rain showers
likely late in the morning, then a chance of rain showers in the
afternoon. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots
by midnight, then diminishing to 15 to 25 knots late. A 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 chance of rain and snow showers.
Waves building to 5 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A slight chance of rain and 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 slight chance of rain and snow
showers 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 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.
.MONDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ267-202100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EST Thu Nov 20 2025

.REST OF TODAY...South winds 15 to 25 knots veering southwest by
mid afternoon. A chance of rain showers late in the morning, then
rain showers likely in the afternoon. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots
late. A chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...West winds 20 to 30 knots veering northwest. A chance
of rain showers. A chance of snow showers in the afternoon. 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 after 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 south 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 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots veering northwest. A chance
of rain showers. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.MONDAY...West winds 10 to 20 knots backing south. A chance of
rain showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-202100-
MAFOR 2016/
Superior West 12630 11720 11620 12630 12730. A chance of showers
late this morning. Waves 3 to 5 feet this afternoon. Waves 3 to 5
feet building to 3 to 6 feet tonight. Waves 3 to 5 feet subsiding
to 2 to 4 feet Friday morning.

Superior North Central 11536 12630 11730 12630 12740. Waves 3 to
6 feet this afternoon. Waves 3 to 6 feet building to 4 to 7 feet
tonight. Waves 4 to 7 feet Friday morning.

Superior South Central 12530 14630 11640 11740. A chance of
showers this afternoon. Waves 2 to 4 feet this afternoon. Waves 3
to 6 feet tonight. Waves 4 to 7 feet Friday morning.

Superior East 12536 11530 11630 11730 12630 11740. 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