306
FZUS63 KMQT 212107
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
407 PM EST Fri Nov 21 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...

Weak ridging of around 30.0 inches tonight will move into the Lower
Great Lakes through Saturday as a 29.8 inch trough moves over Lake
Superior in the afternoon and evening. 30.0 inch ridging follows
Sunday into Monday. Troughing of at least 29.7 inches begins to
organize in the Plains Monday, then moves into the Great Lakes
Tuesday through Wednesday.


LSZ162-220515-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
407 PM EST Fri Nov 21 2025 /307 PM CST Fri Nov 21 2025/

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west by
midnight, then backing south late. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots by late morning, then veering west by mid afternoon. A
chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots backing east after
midnight. Rain showers likely. Waves calm to 2 feet.
.TUESDAY...West winds 20 to 30 knots increasing to gales to
35 knots. Rain showers likely, then a chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 35 knots veering northwest. A chance
of snow showers. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-220515-
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-
407 PM EST Fri Nov 21 2025

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing southwest late.
Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots by late morning, then becoming west 15 to 25 knots by
mid afternoon. A chance of snow showers in the morning. A chance
of rain showers. Snow showers likely in the afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY...West winds 15 to 25 knots. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots backing southeast after
midnight. Rain showers likely. Waves calm to 2 feet.
.TUESDAY...West winds 20 to 30 knots increasing to gales to
40 knots. Rain showers likely, then a chance of snow showers.
Waves building to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...West gales to 40 knots veering northwest. A chance
of snow showers. Waves building to 9 to 12 feet occasionally to
15 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.

$$

LSZ264-220515-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
407 PM EST Fri Nov 21 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 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 by midnight, then becoming west less than 10 knots late.
Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots by late morning, then becoming southwest 15 to 25 knots
by mid afternoon. A chance of snow showers in the morning. A
chance of rain showers. Snow showers likely in the afternoon.
Waves building to 2 to 4 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots by midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 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. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots backing southeast after
midnight. A chance of rain showers in the evening, then rain
showers likely after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southeast winds 20 to 30 knots becoming west gales to
40 knots. Rain showers likely. A chance of snow showers. Waves
building to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Northwest gales to 40 knots. A chance of snow
showers. Waves building to 7 to 11 feet occasionally to 14 feet.

$$

LSZ265-220515-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
407 PM EST Fri Nov 21 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...Northwest winds 10 to 20 knots backing west late.
Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers. A chance of rain showers in
the afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots increasing to
30 knots with a few gale force gusts to 35 knots possible by
midnight, then veering northwest late. Waves subsiding to 1 to
3 feet, then building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY...West winds 20 to 30 knots diminishing to 15 to 25 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. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots backing southeast
after midnight. Rain showers likely. Waves calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots becoming west gales to
40 knots. Rain showers likely. Snow showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 45 knots. Snow showers likely. Waves
building to 5 to 9 feet occasionally to 11 feet.

$$

LSZ266-220515-
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-
407 PM EST Fri Nov 21 2025

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots becoming south 15 to
25 knots by late morning, then increasing to 20 to 30 knots by
mid afternoon. A slight chance of snow showers in the morning,
then rain showers, possibly mixed with snow in the afternoon.
Waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots veering northwest by
midnight, then increasing to 30 knots with a few gale force gusts
to 35 knots possible late. A chance of rain showers. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SUNDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon. A slight chance of rain showers in the
morning. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots backing southwest after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.MONDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of rain showers in the evening,
then rain showers likely after midnight. Waves 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots becoming west gales to
35 knots. Rain showers. Snow showers likely. Waves building to
6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...West gales to 40 knots veering northwest. Snow
showers. Waves building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 9 to 12 feet occasionally to 15 feet.

$$

LSZ267-220515-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
407 PM EST Fri Nov 21 2025

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Isolated
rain and snow showers. Waves 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Isolated snow showers. Waves subsiding to 1 to
3 feet.
.SATURDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by late morning, then backing south by mid afternoon.
Rain showers, possibly mixed with snow in the afternoon. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 20 to 30 knots veering west by
midnight, then becoming northwest to 30 knots with a few gale
force gusts to 35 knots possible late. Rain showers likely in the
evening, then a chance of rain showers after midnight. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SUNDAY...Northwest gales to 35 knots becoming west 15 to
25 knots in the afternoon. A chance of rain showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots backing southwest after
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots backing southeast
after midnight. A chance of rain showers in the evening, then
rain showers after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. Rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...West gales to 40 knots. Rain showers. Snow showers.
Waves building to 10 to 14 feet occasionally to 18 feet.

$$

LSZ261-220515-
MAFOR 2122/
Superior West 12710 11700 11500 11410 11420 11520 11630. A chance
of rain showers Saturday. Waves 1 to 3 feet subsiding to 1 foot
or less tonight. Waves 1 to 3 feet building to 2 to 4 feet
Saturday.

Superior North Central 12720 11710 11700 11600 11410 11426 11437.
Waves 3 to 5 feet subsiding to 1 to 2 feet tonight. Waves 1 foot
or less building to 2 to 4 feet Saturday.

Superior South Central 12720 12710 11600 11510 11420 11437. Waves
3 to 6 feet subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet
building to 2 to 4 feet Saturday.

Superior East 12730 11720 12710 11610 11520 11436. A chance of
snow showers Saturday afternoon. Waves 4 to 7 feet subsiding to 2
to 4 feet tonight. Waves 2 to 4 feet Saturday.

$$

NJL

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

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