300
FZUS63 KMQT 140201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Mon Oct 13 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 30.5 inch high builds over the Canadian Prairie into Tuesday,
increasing ridging over Lake Superior. This high shifts east to the
Great Lakes and northern Ontario by Wednesday at around 30.4 inches.
Ridging weakens to 30.1 inches over Lake Superior through Thursday
as troughing develops over the Plains and the parent high moves
east. Thursday night through Friday, a deepening 29.4 inch low
develops over the Northern Plains and lifts near to Lake Winnipeg.
This low is projected to bring 29.5 to 29.6 inch troughing over Lake
Superior this weekend as the low traverses northern Ontario.


LSZ162-140800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Mon Oct 13 2025 /901 PM CDT Mon Oct 13 2025/

.REST OF TONIGHT...Northwest winds 10 to 20 knots veering north
late. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing southwest late.
Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots backing east after
midnight. A slight chance of showers through midnight. Waves calm
to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots. Showers. Waves calm
to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. Showers likely.
Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 15 to 25 knots veering west. A chance
of showers. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ263-140800-
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 PM EDT Mon Oct 13 2025

.REST OF TONIGHT...Northwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing northwest late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds less than 10 knots veering north
late. A slight chance of showers through midnight. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds less than 10 knots becoming
southwest 5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds less than 10 knots increasing
to 5 to 15 knots after midnight. A slight chance of showers after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. A chance of showers through early afternoon, then
showers by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. Showers likely.
Waves building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots veering southwest. A chance
of showers. Waves building to 2 to 4 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-140800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Mon Oct 13 2025

.REST OF TONIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon, then backing northwest late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight, then diminishing to less than 10 knots late.
Waves calm to 2 feet.
.WEDNESDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.WEDNESDAY NIGHT...South winds less than 10 knots increasing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. Showers likely by mid afternoon. Waves
building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots. Showers likely, then a
chance of showers. Waves 2 to 4 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-140800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Mon Oct 13 2025

.REST OF TONIGHT...West winds 15 to 25 knots veering northwest
after midnight. Waves 2 to 4 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Showers likely by mid afternoon. Waves
calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots. Showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots. Showers likely. Waves calm
to 2 feet.
.SATURDAY...West winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-140800-
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 PM EDT Mon Oct 13 2025

.REST OF TONIGHT...Northwest winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots backing northwest in the
afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers. Waves building to
2 to 4 feet.
.THURSDAY NIGHT...South winds 20 to 30 knots. Showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots. Showers. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. A chance
of showers. Waves 2 to 4 feet.

$$

LSZ267-140800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Mon Oct 13 2025

.REST OF TONIGHT...Northwest winds 15 to 25 knots. Waves 2 to
4 feet building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing northwest by
mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A chance of showers by mid afternoon.
Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots. Showers. Waves subsiding to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering west. Showers
likely. Waves subsiding to calm to 2 feet, then building to 1 to
3 feet.

$$

LSZ261-140800-
MAFOR 1403/
Superior West 12720 13810 11700 12500. Waves 1 to 3 feet
subsiding to 1 foot or less overnight and Tuesday. Waves 1 foot
or less Tuesday evening.

Superior North Central 14730 11820 12710 11700. Waves 4 to 6 feet
overnight. Waves 3 to 5 feet subsiding to 1 to 3 feet Tuesday.
Waves 1 to 2 feet Tuesday evening.

Superior South Central 12730 12720 11820 11720 11820 11810. Waves
3 to 5 feet overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet
Tuesday. Waves 2 to 4 feet subsiding to 1 to 3 feet Tuesday
evening.

Superior East 14730 13720 11820. Waves 3 to 6 feet overnight.
Waves 4 to 7 feet subsiding to 3 to 5 feet Tuesday. Waves 3 to 5
feet Tuesday evening.

$$

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