056
FZUS63 KMQT 181502
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EST Tue Nov 18 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 averaging 30.1 inches persists over Lake Superior
today as a 28.8 inch low retrogrades back into far northern Quebec.
30.2 inch ridging continues to encompass the Great Lakes basin
Wednesday, shifting into New England Wednesday night and Thursday as
a 29.7 inch low develops over northern Ontario. High pressure
ridging of around 30.1 inches develops over the Northern Plains and
Upper Midwest on Friday before moving into the Great Lakes region by
Saturday.


LSZ162-182100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EST Tue Nov 18 2025 /901 AM CST Tue Nov 18 2025/

.REST OF TODAY...East winds 5 to 15 knots diminishing to less
than 10 knots by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots increasing to 5 to
15 knots by midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
rain showers in the evening, then rain showers likely after
midnight. Waves building to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Rain showers likely in the morning,
then a slight chance of rain showers in the afternoon. Waves 1 to
3 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. Waves
calm to 2 feet.

$$

LSZ263-182100-
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 Tue Nov 18 2025

.REST OF TODAY...Northeast winds less than 10 knots backing
northwest by mid afternoon. Waves calm to 2 feet.
.TONIGHT...West winds less than 10 knots increasing to 5 to
15 knots by midnight, then backing southwest late. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots. A chance of
rain showers. Waves building to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Rain showers likely in the morning,
then a chance of rain showers in the afternoon. Waves building to
3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 1 to 3 feet.

$$

LSZ264-182100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EST Tue Nov 18 2025

.REST OF TODAY...North winds less than 10 knots backing
northwest. Waves calm to 2 feet.
.TONIGHT...Northwest winds less than 10 knots becoming west 5 to
15 knots by midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon. Rain showers in the morning, then a
chance of rain showers in the afternoon. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 2 to 4 feet.

$$

LSZ265-182100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EST Tue Nov 18 2025

.REST OF TODAY...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west by
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
rain showers. Waves calm to 2 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon. Rain showers. Waves building to 2 to
4 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots. A chance of rain
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots increasing to 15 to
25 knots. Waves calm to 2 feet.

$$

LSZ266-182100-
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 Tue Nov 18 2025

.REST OF TODAY...North winds 5 to 15 knots backing northwest.
Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west by
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon. Rain showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 20 to 30 knots. Rain showers
likely in the evening, then a chance of rain showers after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. A chance
of rain showers. Waves building to 2 to 4 feet.

$$

LSZ267-182100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EST Tue Nov 18 2025

.REST OF TODAY...North winds 5 to 15 knots backing northwest by
late morning, then increasing to 10 to 20 knots by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots backing west late.
Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Rain showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Rain showers in the evening, then a chance of
rain showers after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest. A chance
of rain showers. Waves subsiding to calm to 2 feet, then building
to 2 to 4 feet.

$$

LSZ261-182100-
MAFOR 1816/
Superior West 12100 11200 11400 13500 11510. Waves 1 foot or
less.

Superior North Central 14700 12600 11610 11510. Waves 1 foot or
less.

Superior South Central 14700 13600 11500. Waves 1 foot or less.

Superior East 14700 11700 13600. Waves around 1 foot.

$$

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