752
FZUS63 KMQT 140801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Tue Oct 14 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 over the Canadian Prairie builds into Lake Superior
today. 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.


LSZ162-142000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Tue Oct 14 2025 /301 AM CDT Tue Oct 14 2025/

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots backing southwest late. A
slight chance of rain showers by mid afternoon. Waves calm to
2 feet.
.TONIGHT...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 5 to 15 knots. Showers likely.
Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.

$$

LSZ263-142000-
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-
401 AM EDT Tue Oct 14 2025

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...West winds less than 10 knots veering north late. A
slight chance of showers through midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds less than 10 knots veering southwest in
the afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots. A chance of showers
through early afternoon, then showers by mid afternoon. Waves
building to 1 to 3 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. Showers likely.
Waves 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West gales to 35 knots diminishing to 20 to 30 knots.
A chance of showers. Waves building to 4 to 7 feet occasionally
to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-142000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Tue Oct 14 2025

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...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.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight, then diminishing to less than 10 knots late. Waves calm
to 2 feet.
.WEDNESDAY...North winds less than 10 knots backing southwest in
the afternoon, then veering west late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds less than 10 knots becoming
south 5 to 15 knots 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
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 increasing to 15 to
25 knots. A chance of showers, then showers likely. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Southwest gales to 35 knots becoming west 20 to
30 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ265-142000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Tue Oct 14 2025

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 2 to
4 feet.
.TODAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...North winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest in the
afternoon, then veering east late. 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 20 to
30 knots by mid afternoon. Showers likely by mid afternoon. Waves
calm to 2 feet.
.THURSDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots. A chance of showers. Waves
calm to 2 feet.
.SATURDAY...West winds 15 to 25 knots. A chance of showers. Waves
building to 1 to 3 feet.

$$

LSZ266-142000-
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-
401 AM EDT Tue Oct 14 2025

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...North winds 15 to 25 knots backing northwest in the
afternoon. Waves subsiding to 2 to 4 feet.
.TONIGHT...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 in the
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 by mid afternoon.
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 15 to 25 knots. Showers. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 15 to 25 knots. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-142000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Tue Oct 14 2025

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northwest winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering northeast late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest in the
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 increasing to 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, then building
to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 10 to 20 knots veering west. Showers
likely. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.

$$

LSZ261-141400-
MAFOR 1409/
Superior West 13810 11800 11400 11500 11400 11300. Waves 1 to 3
feet subsiding to 1 foot or less today. Waves 1 foot or less
tonight.

Superior North Central 11730 11720 11820 13710 11700 11800. Waves
3 to 5 feet subsiding to 1 to 3 feet today. Waves 2 feet or less
tonight.

Superior South Central 11730 11720 11820 11720 11820 12810 11800.
Waves 3 to 5 feet subsiding to 2 to 4 feet today. Waves 1 to 3
feet tonight.

Superior East 12730 13720 11820 12810. Waves 3 to 6 feet today.
Waves 2 to 4 feet tonight.

$$

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