658
FZUS63 KMQT 271500
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EST Thu Nov 27 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...

Lake Superior will spend Thanksgiving between a 30.6 inch high over
the Dakotas and a 29.4 inch low over Quebec. By Friday, the high
will weaken slightly to 30.5 inches as it shifts over the Upper
Mississippi River Valley while the low weakens to 29.5 inches, still
over Quebec. Meanwhile, a 29.7 inch Colorado Low develops, which
will move over Oklahoma at 29.8 inches on Saturday while 30.4 inch
high pressure spans the Great Lakes. The low ejects into the
southern Great Lakes Basin early Sunday morning at 29.9 inches,
reaching the southern Ontario/Quebec border at 29.8 inches Sunday
evening. In its wake, 30.6 inch high pressure moves over the Upper
Midwest, sliding south of the Great Lakes at 30.4 inches Monday. The
high is eroded on Tuesday by a low pressure of around 29.8 inches
over northern Ontario and a 29.5 inch Nor`Easter off the coast of
the Chesapeake Bay.


LSZ162-272100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EST Thu Nov 27 2025 /900 AM CST Thu Nov 27 2025/

.REST OF TODAY...Northwest winds 20 to 30 knots. Isolated snow
showers in the afternoon. Waves 5 to 8 feet occasionally to
10 feet subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots. A slight chance of snow
showers in the morning. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots. A chance of snow showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots. A chance of snow.
Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ263-272100-
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-
1000 AM EST Thu Nov 27 2025

...GALE WARNING IN EFFECT UNTIL 1 PM EST THIS AFTERNOON...

.REST OF TODAY...Northwest gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Isolated snow showers. Waves 7 to
10 feet occasionally to 13 feet subsiding to 5 to 8 feet
occasionally to 10 feet.
.TONIGHT...Northwest winds 20 to 30 knots. Isolated snow showers.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A slight chance of snow showers in the morning. Waves
subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots. A chance of snow showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of snow. Waves building to 2 to
4 feet.
.SUNDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.MONDAY...West winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.

$$

LSZ264-272100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EST Thu Nov 27 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TODAY...North gales to 40 knots becoming northwest gales
to 35 knots by mid afternoon. Isolated snow showers. Waves 11 to
15 feet occasionally to 19 feet subsiding to 9 to 12 feet
occasionally to 15 feet.
.TONIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots late. Isolated snow showers in the evening. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.FRIDAY...Northwest winds 15 to 25 knots. A slight chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots. A slight chance of
snow showers in the evening. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots veering north in the
afternoon. A slight chance of snow in the afternoon. Waves calm
to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of snow. Waves building to 2 to
4 feet.
.SUNDAY...Northwest winds 20 to 30 knots. A chance of snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots. Waves subsiding to 3 to
6 feet occasionally to 8 feet.

$$

LSZ265-272100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EST Thu Nov 27 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TODAY...Northwest gales to 45 knots. Snow showers late
in the morning, then scattered snow showers in the afternoon.
Waves 12 to 17 feet occasionally to 21 feet subsiding to 9 to
12 feet occasionally to 15 feet.
.TONIGHT...Northwest gales to 40 knots. Scattered snow showers.
Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.FRIDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. Snow showers likely. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. A chance of snow showers. Waves subsiding to calm to
2 feet.
.SATURDAY...West winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon. A chance of snow showers. Waves calm
to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Snow. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Snow showers likely.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 2 to 4 feet.
.MONDAY...West winds 15 to 25 knots backing southwest. A chance
of snow showers. Waves subsiding to 1 to 3 feet.

$$

LSZ266-272100-
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-
1000 AM EST Thu Nov 27 2025

...GALE WARNING IN EFFECT THROUGH FRIDAY MORNING...

.REST OF TODAY...North gales to 45 knots backing northwest by mid
afternoon. Snow showers. Waves 15 to 20 feet occasionally to
25 feet subsiding to 12 to 17 feet occasionally to 21 feet.
.TONIGHT...Northwest gales to 45 knots. Scattered snow showers.
Waves subsiding to 10 to 14 feet occasionally to 18 feet.
.FRIDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Snow showers. Waves subsiding to 6 to
9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Snow showers in the evening, then
a chance of snow showers after midnight. Waves subsiding to 2 to
4 feet.
.SATURDAY...Northwest winds 5 to 15 knots veering north in the
afternoon. Snow showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Snow. Waves building to 1 to 3 feet.
.SUNDAY...Northwest gales to 35 knots. Snow showers likely. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.MONDAY...West winds 15 to 25 knots backing southwest. A chance
of snow showers. Waves subsiding to 3 to 6 feet occasionally to
8 feet.

$$

LSZ267-272100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EST Thu Nov 27 2025

...GALE WARNING IN EFFECT THROUGH FRIDAY MORNING...

.REST OF TODAY...North gales to 45 knots. Snow showers. Waves
15 to 20 feet occasionally to 25 feet subsiding to 11 to 15 feet
occasionally to 19 feet, then building to 12 to 17 feet
occasionally to 21 feet.
.TONIGHT...North gales to 40 knots. Scattered snow showers. Waves
subsiding to 9 to 12 feet occasionally to 15 feet.
.FRIDAY...North gales to 35 knots backing northwest. A slight
chance of sleet in the morning. Snow showers. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Snow showers. Waves subsiding to
2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots. Snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots backing east after
midnight. Snow. Waves calm to 2 feet.
.SUNDAY...North winds 20 to 30 knots backing northwest. Snow
showers. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...West winds 15 to 25 knots backing southwest. Snow
showers likely. Waves subsiding to 3 to 5 feet occasionally to
7 feet.

$$

LSZ261-272100-
MAFOR 2716/
Superior West...GALE WARNING IN EFFECT...15740 11730 11720. Waves
5 to 8 feet this afternoon. Waves 4 to 7 feet subsiding to 3 to 6
feet tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Friday
morning.

Superior North Central...GALE WARNING IN EFFECT...15750 12740.
Waves 10 to 14 feet this afternoon. Waves 7 to 11 feet subsiding
to 6 to 9 feet tonight. Waves 6 to 9 feet Friday morning.

Superior South Central...GALE WARNING IN EFFECT...11767 11757
14750 19757 11740 19747 11747. Waves 12 to 17 feet this
afternoon. Waves 10 to 15 feet subsiding to 9 to 12 feet tonight.
Waves 7 to 11 feet Friday morning.

Superior East...GALE WARNING IN EFFECT...11857 11757 11857 12850
19857 11850 12847. Waves 13 to 17 feet subsiding to 11 to 15 feet
this afternoon. Waves 10 to 15 feet tonight. Waves 8 to 12 feet
Friday morning.

$$

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